CN110436729A - Device and method for excess sludge extracellular polymeric removing and recycling - Google Patents
Device and method for excess sludge extracellular polymeric removing and recycling Download PDFInfo
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- CN110436729A CN110436729A CN201910800203.1A CN201910800203A CN110436729A CN 110436729 A CN110436729 A CN 110436729A CN 201910800203 A CN201910800203 A CN 201910800203A CN 110436729 A CN110436729 A CN 110436729A
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- 239000010802 sludge Substances 0.000 title claims abstract description 253
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004064 recycling Methods 0.000 title claims abstract description 19
- 238000000855 fermentation Methods 0.000 claims abstract description 93
- 238000003860 storage Methods 0.000 claims abstract description 40
- 239000004094 surface-active agent Substances 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 7
- 230000018044 dehydration Effects 0.000 claims abstract description 4
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 230000004151 fermentation Effects 0.000 claims description 29
- 239000010865 sewage Substances 0.000 claims description 20
- 238000012545 processing Methods 0.000 claims description 15
- 239000003876 biosurfactant Substances 0.000 claims description 13
- 230000008676 import Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 230000004087 circulation Effects 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 235000021391 short chain fatty acids Nutrition 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 150000004666 short chain fatty acids Chemical class 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims 1
- 238000003756 stirring Methods 0.000 abstract description 7
- 230000000813 microbial effect Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 230000008569 process Effects 0.000 description 13
- 239000002253 acid Substances 0.000 description 10
- 238000010992 reflux Methods 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 5
- 239000005416 organic matter Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000013049 sediment Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000012512 characterization method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000005446 dissolved organic matter Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- FCBUKWWQSZQDDI-UHFFFAOYSA-N rhamnolipid Chemical compound CCCCCCCC(CC(O)=O)OC(=O)CC(CCCCCCC)OC1OC(C)C(O)C(O)C1OC1C(O)C(O)C(O)C(C)O1 FCBUKWWQSZQDDI-UHFFFAOYSA-N 0.000 description 3
- 230000002053 acidogenic effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 239000003864 humus Substances 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 238000005063 solubilization Methods 0.000 description 2
- 230000007928 solubilization Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HVCOBJNICQPDBP-UHFFFAOYSA-N 3-[3-[3,5-dihydroxy-6-methyl-4-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxydecanoyloxy]decanoic acid;hydrate Chemical compound O.OC1C(OC(CC(=O)OC(CCCCCCC)CC(O)=O)CCCCCCC)OC(C)C(O)C1OC1C(O)C(O)C(O)C(C)O1 HVCOBJNICQPDBP-UHFFFAOYSA-N 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 229930186217 Glycolipid Natural products 0.000 description 1
- -1 Small molecule short chain fatty acids Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Sludge (AREA)
Abstract
A kind of device for excess sludge extracellular polymeric removing and recycling, described device includes storage basin, and outlet is connect with excess sludge pretreatment unit；Excess sludge pretreatment unit, including dosing premixing pool and hydrocyclone, wherein dosing premixing pool is used to add surfactant to the sludge that storage basin conveying comes, and separates organic impurities；Hydrocyclone stirs the sludge that surfactant is added in dosing premixing pool for high speed；Short distance anaerobic fermentation unit, including sludge anaerobic fermentation reactor；Excess sludge dewatering unit, including sludge concentration tank and dehydration and drying equipment.The present invention also provides the methods for carrying out excess sludge extracellular polymeric removing and recycling using above-mentioned apparatus.The present invention efficiently realizes the removing of excess sludge extracellular polymeric in guaranteeing excess sludge while microbial activity；Hardly possible in excess sludge is realized to convert using carbon source to the high value carbon source easily utilized.
Description
Technical field
The present invention relates to the biologic treating technique field of sewage sludge, more particularly, to excess sludge extracellular polymeric is shelled
From the device and method with recycling.
Background technique
The a large amount of excess sludge of association in sewage disposal process, nearly 5 years national excess sludge yields averagely about 47,600,000
Ton/year (80% moisture content), it is contemplated that the year two thousand twenty reaches nearly 53,000,000 tons, and processing disposal costs typically constitute sewage treatment and always grasp
Make the 30-40% of cost, it is contemplated that specific resistance to filtration investment in the year two thousand twenty whole nation will reach 450-600 hundred million.Contain in excess sludge big
Organic matter is measured, it be about 20-60mg/gTSS, TP is about 2.5-5mg/gTSS that wherein TCOD, which is about 780-980mg/gTSS, TN, is
A kind of potential waste for being converted into useful resources.The extracellular polymeric of excess sludge is that cell and water are removed outside extracellular microbial
The third-largest component part in addition, accounts for the 50-90% of excess sludge total organic matter, mainly by protein and polysaccharide and humus
Be divided into TB-EPS, LB-EPS and soluble EPS from inside to outside Deng composition, on space structure, except TB-EPS be relatively difficult to remove with
Outside, dissolubility and loosely bound EPS are easy to realize by physico-chemical method and remove.
With national " urban wastewater treatment firm pollutant emission standard " promulgation in 2002, the maximal emission quilt of total nitrogen
It improves, and most domestic water factories do not reach requirement, key reason is exactly the C/N of China's municipal sewage generally lower, can not
Meet the needs of denitrogenation, the carbon source being typically necessary outside supplementary quota, but which not only adds the CO of sewage plant2Discharge and increasing
Excess sludge production is added.Small molecule short chain fatty acids can be converted by carbon source complicated in sludge by anaerobic fermentation, it can be with
It is utilized as denitrifying carbon source efficient inside sewage plant, extracellular polymeric (Extracellular in excess sludge
Polymeric substances, EPS) effectively crack be the key that promoted sludge hydrolytic and subsequent bio conversion.Exist at present
Sewage treatment there are sludge of sewage treatment plant yield huge, resource utilization degree is not high and excess sludge is difficult to carry out efficiently
Pretreated problem.
Summary of the invention
In view of this, the main purpose of the present invention is to provide one kind for the removing of excess sludge extracellular polymeric and resource
The device and method of change, at least be partially solved at least one of above-mentioned technical problem.
To achieve the goals above, it as an aspect of of the present present invention, provides a kind of for excess sludge extracellular polymeric
The device of removing and recycling, described device include storage basin, excess sludge pretreatment unit, short distance anaerobic fermentation unit and remain
Remaining sludge dewatering unit, in which:
Storage basin, outlet are connect with excess sludge pretreatment unit, for storing the sludge to be processed of input；
Excess sludge pretreatment unit, including dosing premixing pool and hydrocyclone, wherein dosing premixing pool is used for storage
The sludge addition surfactant that mud sump conveying comes, separates organic impurities；Hydrocyclone stirs pre- in dosing for high speed
The sludge of surfactant is added in mixed pond；
Short distance anaerobic fermentation unit, including sludge anaerobic fermentation reactor, for the processing of hydrocyclone high-speed separation
Sludge afterwards carries out anaerobic fermentation processing；
Excess sludge dewatering unit, including sludge concentration tank and dehydration and drying equipment, for short distance anaerobic fermentation unit
Sludge after fermentation process is concentrated and dried.
Wherein, described device further includes secondary settling tank, and the secondary settling tank is for concentration and returnedactivatedsludge, outlet connection
Dosing premixing pool in storage basin and excess sludge pretreatment unit.
Wherein, dosing mouth and agitating device are provided at the top of the dosing premixing pool；
Preferably, the storage basin bottom is connected with excess sludge dewatering unit.
Wherein, the sludge in the dosing premixing pool is transported in hydrocyclone by high-speed centrifugal pump, and the height
Fast centrifugal pump is combined with hydrocyclone realizes high speed hydraulic cyclone process；
It is formed preferably, being connect respectively with dosing premixing pool at the top and bottom of the hydrocyclone and installing control valve additional
Reflux, for guaranteeing required hydraulic cyclone circulation time.
Wherein, agitating device is set at the top of the sludge anaerobic fermentation reactor, the sludge anaerobic fermentation reactor
Temperature control external member, pH sensor and/or DO sensor are added in main body.
As another aspect of the present invention, a kind of side for excess sludge extracellular polymeric removing and recycling is provided
Method, comprising the following steps:
By in storage basin sludge and secondary settling tank import sludge proportionally inject dosing premixing pool；
It measures and mixes excess sludge concentration in dosing premixing pool, surfactant is added；
Make to enter hydrocyclone by the processed excess sludge high speed of biosurfactant；
Pretreated excess sludge is injected and carries out anaerobic fermentation processing in excess sludge anaerobic fermentation reactor；
The fermented sludge in the anaerobic fermentation reactor is discharged, is concentrated drying.
Wherein, secondary settling tank excess sludge is injected in storage basin and is kept in, temporary storage time is 1~3d, in dosing premixing pool
Excess sludge is kept in sludge and secondary settling tank import sludge by storage basin and is mixed according to 1: 1 ratio, into hydrocyclone
Mixing excess sludge concentration be 15~18g/L.
Wherein, according to the sludge concentration of the excess sludge mixed in proportion in dosing premixing pool, 0.005~0.1g/ is added
The surfactant of gTSS；
Preferably, entering hydrocyclone and in dosing by the processed excess sludge high speed of biosurfactant
Continue the multiple circulations of eddy flow between premixing pool and hydrocyclone, the duration is 0.5~20min.
Wherein, pretreated excess sludge is injected in sludge anaerobic fermentation reactor, ferment 2~8d, and passes through temperature
The correspondence parameter that fermentation system is monitored and controlled in external member, pH sensor and/or DO sensor is controlled, wherein temperature control is 25~40
DEG C, pH be 6.5~8.0, DO is 0.05~1.0.
Wherein, fermentation liquid is obtained after anaerobic fermentation processing in excess sludge injection excess sludge anaerobic fermentation reactor, after
It is continuous to the recycling of fermentation liquid and using method include: first is that recycle broth extraction short chain fatty acids by concentration filters pressing, second is that
Pressing filtering liquid is directly back to the covering carbon source in sewage treatment denitrification link as sewage water denitrification.
Based on the above-mentioned technical proposal it is found that the device for excess sludge extracellular polymeric removing and recycling of the invention
And method one of at least has the advantages that compared with the existing technology:
(1) stripping of excess sludge extracellular polymeric is efficiently realized while microbial activity in guaranteeing excess sludge
From；
(2) yield of excess sludge is effectively reduced；
(3) hardly possible in excess sludge is realized to convert using carbon source to the high value carbon source easily utilized；
(4) it may be implemented to utilize excess sludge fermentation and acid under middle low temperature；
(5) when raw water carbon source deficiency is difficult to meet the carbon source demand of denitrification process, tunning can be made
To cover carbon source, promote the removing of total nitrogen.
Detailed description of the invention
Fig. 1 is that the present invention efficiently removes and the structural schematic diagram of the device of recycling for excess sludge extracellular polymeric；
Fig. 2 is that the present invention efficiently removes and the flow chart of the method for recycling for excess sludge extracellular polymeric；
Fig. 3 is the characterization that excess sludge pre-processes front and back extracellular polymeric structure composition variation；
Fig. 4 is the characterization that excess sludge pre-processes front and back sludge rheology characteristic variations；
Fig. 5 is anaerobic fermentation and acid production accumulation characterization；
Fig. 6 is the characterization that excess sludge handles sludge concentration variation through this system.
In above-mentioned attached drawing, appended drawing reference meaning is as follows:
1, secondary settling tank 2, storage basin
3, dosing premixing pool 4, high speed hydrocyclone
5, sludge anaerobic fermentation reactor 6, excess sludge dewatering unit
1.1, sludge from final clarifier pumps 1.2, Mud-intake valve
2.1, agitating device 2.2, dosing premixing pool are into dredge pump
3.1, dosing mouth 3.2, high-speed centrifugal pump
4.1, eddy flow sediment return valve 4.2, hydrocyclone mud valve
4.4, eddy flow sludge reflux valve
5.1, DO/pH detector 5.2, anaerobic fermentation reactor mud valve
5.3, heating and thermal insulation controls external member 5.4, sludge pump
6.1, sludge concentration tank is into dredge pump
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
The present invention provides the method that one kind can be effectively peeled off excess sludge extracellular polymeric (EPS), shortens excess sludge
It the time of middle complexity carbon source bioconversion, improves excess sludge and produces high-valued conversion rate of products.
Specifically, a kind of device for excess sludge extracellular polymeric removing and recycling, described device includes storage mud
Pond, excess sludge pretreatment unit, short distance anaerobic fermentation unit and excess sludge dewatering unit, in which:
Storage basin, outlet are connect with excess sludge pretreatment unit, for storing the sludge to be processed of input；
Excess sludge pretreatment unit, including dosing premixing pool and hydrocyclone, wherein dosing premixing pool is used for storage
The sludge addition surfactant that mud sump conveying comes, separates organic impurities；Hydrocyclone stirs pre- in dosing for high speed
The sludge of surfactant is added in mixed pond；
Short distance anaerobic fermentation unit, including sludge anaerobic fermentation reactor, for the processing of hydrocyclone high-speed separation
Sludge afterwards carries out anaerobic fermentation processing；
Excess sludge dewatering unit, including sludge concentration tank and dehydration and drying equipment, for short distance anaerobic fermentation unit
Sludge after fermentation process is concentrated and dried.
Wherein, described device further includes secondary settling tank, and the secondary settling tank is for concentration and returnedactivatedsludge, outlet connection
Dosing premixing pool in storage basin and excess sludge pretreatment unit.
Wherein, dosing mouth and agitating device are provided at the top of the dosing premixing pool；
Preferably, the storage basin bottom is connected with excess sludge dewatering unit.
Wherein, the sludge in the dosing premixing pool is transported in hydrocyclone by high-speed centrifugal pump, and the height
Fast centrifugal pump is combined with hydrocyclone realizes high speed hydraulic cyclone process；
It is formed preferably, being connect respectively with dosing premixing pool at the top and bottom of the hydrocyclone and installing control valve additional
Reflux, for guaranteeing required hydraulic cyclone circulation time.
Wherein, agitating device is set at the top of the sludge anaerobic fermentation reactor, the sludge anaerobic fermentation reactor
Temperature control external member, pH sensor and/or DO sensor are added in main body.
A method of using device as described above progress excess sludge extracellular polymeric removing and recycling, including with
Lower step:
By in storage basin sludge and secondary settling tank import sludge proportionally inject dosing premixing pool；
It measures and mixes excess sludge concentration in dosing premixing pool, surfactant is added；
Make to enter hydrocyclone by the processed excess sludge high speed of biosurfactant；
Pretreated excess sludge is injected and carries out anaerobic fermentation processing in excess sludge anaerobic fermentation reactor；
The fermented sludge in the anaerobic fermentation reactor is discharged, is concentrated drying.
Wherein, secondary settling tank excess sludge is injected in storage basin and is kept in, temporary storage time is 1~3d, in dosing premixing pool
Excess sludge is kept in sludge and secondary settling tank import sludge by storage basin and is mixed according to 1: 1 ratio, into hydrocyclone
Mixing excess sludge concentration be 15~18g/L.
Wherein, according to the sludge concentration of the excess sludge mixed in proportion in dosing premixing pool, 0.005~0.1g/ is added
The surfactant of gTSS；
Preferably, entering hydrocyclone and in dosing by the processed excess sludge high speed of biosurfactant
Continue the multiple circulations of eddy flow between premixing pool and hydrocyclone, the duration is 0.5~20min.
Wherein, pretreated excess sludge is injected in sludge anaerobic fermentation reactor, ferment 2~8d, and passes through temperature
The correspondence parameter that fermentation system is monitored and controlled in external member, pH sensor and/or DO sensor is controlled, wherein temperature control is 25~40
DEG C, pH be 6.5~8.0, DO is 0.05~1.0.
Wherein, fermentation liquid is obtained after anaerobic fermentation processing in excess sludge injection excess sludge anaerobic fermentation reactor, after
It is continuous to the recycling of fermentation liquid and using method include: first is that recycle broth extraction short chain fatty acids by concentration filters pressing, second is that
Pressing filtering liquid is directly back to the covering carbon source in sewage treatment denitrification link as sewage water denitrification.
Technical solution of the present invention is further elaborated with reference to the accompanying drawings and examples.
As shown in Figure 1, the present invention provide it is a kind of efficiently removed for excess sludge extracellular polymeric and the device of recycling,
Described device includes secondary settling tank 1, storage basin 2, dosing premixing pool 3, high-speed centrifugal pump 3.2, hydrocyclone 4, sludge anaerobic hair
Ferment reactor 5, excess sludge dewatering unit 6.Excess sludge wherein is added between storage basin 2 and excess sludge dewatering unit 6
Pretreatment unit and short distance anaerobic fermentation unit, sludge pretreatment unit is by dosing premixing pool 3 and high-speed centrifugal pump 3.2 and water
Power cyclone 4 forms, and storage basin 2 is connected with dosing premixing pool 3 and excess sludge dewatering unit 6 respectively, and dosing premixing pool 3 is logical
Cross high-speed centrifugal pump 3.2 and high speed hydrocyclone 4, excess sludge anaerobic fermentation reactor 5, excess sludge dewatering unit 6 according to
It is secondary to be connected.The top setting dosing mouth 3.1 and agitating device of dosing premixing pool 3, the dosing premixing pool 3 is by into dredge pump
2.2 are connected with storage basin 2, are connected by Mud-intake valve 1.2 and water inlet pipe with secondary settling tank, pass through high-speed centrifugal pump 3.2 and water
Power cyclone 4 is connected.High speed hydraulic cyclone process combines realization, hydraulic cyclone with hydrocyclone 4 by high-speed centrifugal pump 3.2
4 top and bottom of device, which connect with dosing premixing pool 3 respectively and install control valve 4.1 and 4.4 additional, forms reflux, to guarantee required water
The power cyclone circulating time, hydrocyclone 4 by high-speed centrifugal pump 3.2 and spoil disposal pipe valve 4.2 respectively with the dosing premixing pool 3
It is connected with the sludge anaerobic fermentation reactor 5.Agitating device, reactor master are set at the top of sludge anaerobic fermentation reactor 5
The body installation temperature control external member 5.3, reactor installs pH and DO sensor 5.1 additional, bottom passes through mud valve 5.2 and concentration basin
It is connected into dredge pump 5.4 with excess sludge dewatering unit 6.
As shown in Fig. 2, present invention simultaneously provides applications to realize that excess sludge extracellular polymeric is efficiently removed and recycling
The operating process of method:
(1) secondary settling tank excess sludge is injected in storage basin and is kept in, temporary storage time is 1~3d, opens Mud-intake valve and into mud
Pump, by storage basin sludge and secondary settling tank import sludge proportionally inject dosing premixing pool, and by stirring and evenly mixing；At this
In step, excess sludge in dosing pond sludge and secondary settling tank import sludge kept according to 1: 1 ratio mixing by storage basin and
At.Certain city of northern China sewage treatment plant storage basin sludge is made into the excess sludge of 15-18g/L using the mixing of secondary settling tank import sludge
Dosing premixing pool is added in head, opens agitating device and dissolved oxygen control, adjusts dissolved oxygen to 0.05-1.0mg/L and pH value 6.5-
Between 8.0.
(2) according to the sludge concentration of the excess sludge mixed in proportion in dosing pond, the surfactant is added, and fills
Divide and stirs evenly；In this step, according to the sludge concentration of the excess sludge mixed in proportion in dosing pond, it is added 0.005~
The surfactant of 0.1g/gTSS.Using concentration is 23-25% rhamnolipid as showing that face activating agent, dosage be
0.34~6.8g/L opens agitating device and adjusts revolving speed, by mixing sludge and sandlwood under the premise of generating bubble less as far as possible
Glycolipid stirs.
(3) high-speed centrifugal pump, eddy flow sludge reflux valve, eddy flow sediment return valve are opened, is made by biosurfactant
Processed excess sludge high speed enters hydrocyclone and continues the multiple circulations of eddy flow；In this step, by biological surface
Activating agent processed excess sludge high speed enters hydrocyclone and continues the multiple circulations of eddy flow, and the duration is 0.5~
20min, cardinal principle are to make the solubilization processing for having been subjected to biosurfactant using the physical action of high speed hydraulic cyclone
Excess sludge extracellular polymeric quickly stripped down from excess sludge cell and sludge floc sedimentation, be converted into and be easier to be fermented
The dissolved organic matter that acid-producing bacteria utilizes.
(4) water flow cyclone mud valve is opened, eddy flow sludge reflux valve, eddy flow sediment return valve is then shut off, will locate in advance
Excess sludge after reason injects in the excess sludge anaerobic fermentation reactor, and is supervised by temperature control external member and pH, DO sensor
Survey and control the service condition and parameter of fermentation system；In step (4), pretreated excess sludge is injected into the residue
In sludge anaerobic fermentation reactor, ferment 2~10d, and fermentation system is monitored and controlled by temperature control external member and pH, DO sensor
The parameters such as temperature, wherein temperature control is 25~40 DEG C, pH are 6.5~8.0, DO is 0.05~1.0；
(5) anaerobic fermentation reactor mud valve and sludge pump are opened, the fermentation being discharged in the anaerobic fermentation reactor is dirty
Mud leaves kind of a mud simultaneously, prepares the fermentation of batch-type sludge anaerobic.
Adjustment fermentation time is measured by the yield to sludge anaerobic fermentation process Short-Chain Fatty Acids.With the north certain
Most preferably fermentation time control is in 3d for excess sludge of municipal sewage plant is handled through present system.
It is as follows that case is embodied:
Specific experiment is northern certain sewage treatment plant's municipal wastewater processing excess sludge (TCOD=780- with excess sludge
980mg/gTSS, TN=20-60mg/gTSS, TP=2.5-5mg/gTSS), dosing premixing pool dischargeable capacity used is 60L, high
The power of fast centrifugal pump is 50HZ, revolving speed 3000r/min, and the dischargeable capacity of anaerobic fermentation reactor is 30L, and excess sludge is adopted
It is fermented with batch-type, is inoculated with the anaerobic activated sludge of 10-15%, the SRT in fermentation system is 3-5d.Carrying out practically operating process
It is as follows with operational effect:
(1) secondary settling tank excess sludge is injected and keeps in 1~3d in storage basin, Mud-intake valve and into dredge pump is opened, by storage basin
In sludge and secondary settling tank import sludge stirred and evenly mixed according to 1: 1 ratio and be made into the excess sludge head of 17000mg/L or so and add
Enter dosing premixing pool, opens agitating device and dissolved oxygen control, adjusting dissolved oxygen to 0.3mg/L or so and pH value 6.8 or so.
(2) according to the sludge concentration of the excess sludge mixed in proportion in dosing pond, 0.34~6.8g/L concentration is added
Rhamnolipid.It opens agitating device and adjusts revolving speed, by mixing sludge and rhamnolipid under the premise of generating bubble less as far as possible
It stirs.
(3) high-speed centrifugal pump, eddy flow sludge reflux valve, eddy flow sediment return valve are opened, is made by biosurfactant
Processed excess sludge high speed enters hydrocyclone and continues 0.5~20min of eddy flow.
(4) water flow cyclone mud valve is opened, eddy flow sludge reflux valve, eddy flow sediment return valve is then shut off, will locate in advance
Excess sludge after reason injects in the excess sludge anaerobic fermentation reactor 3d that ferments, and is passed by temperature control external member and pH, DO
The service condition and parameter of sensor monitoring and control fermentation system are as follows: temperature control is 35 DEG C or so, pH are 6.8 or so, DO is
0.3mg/L or so；
(5) anaerobic fermentation reactor mud valve and sludge pump are opened, the fermentation being discharged in the anaerobic fermentation reactor is dirty
Mud leaves kind of a mud simultaneously, enters sludge dewatering unit by sludge pipe, recycles broth extraction short-chain fat by concentration filters pressing
Acid, or pressing filtering liquid is directly back to the covering carbon source in sewage treatment denitrification link as sewage water denitrification.
Plant excess sludge is handled using Treating Municipal Sewage of the present invention, pretreated sludge passes through the short chain rouge of anaerobic fermentation
Fat acid accumulation concentration 2500mg/L, conversion ratio 240mg/gVSS；Then the sludge after fermentation is passed through into the de- of sewage treatment plant
Water unit, the TSS of excess sludge have dropped 17% or so, and short-chain fat acid recovering rate is 3100mg/L or so.
Technical principle of the invention is as follows:
The extracellular polymeric of excess sludge is the outer the third-largest component part in addition to cell and water of extracellular microbial, accounts for residue
70% or so of sludge total organic matter is mainly made of protein and polysaccharide and humus etc..On space structure from inside to outside
It is extracellular poly- to be divided into type extracellular polymeric (TB-EPS) of combining closely, loose mating type extracellular polymeric (LB-EPS) and dissolubility
It closes object (Soluble EPS), in addition to TB-EPS relatively is difficult to remove, dissolubility and loosely bound EPS are easy to pass through physics and chemistry side
Method realizes removing.Biosurfactant and high speed hydraulic cyclone can effectively realize cracking and dissolving for extracellular polymeric, at this
A large amount of disruptivenesses will not be caused to damage in invention condition setting range to active microorganism cell, ensure that while removing EPS
Bioactivity, the biomass for being conducive to subsequent fermentations are kept.The structure composition of EPS is become in preprocessing process
Change, as shown in table 1 and Fig. 3, Fig. 3 is before excess sludge handles the pretreatment of coupling high-speed hydraulic cyclone by biosurfactant
Images of transmissive electron microscope afterwards can significantly show that preprocessing process can be efficiently peeled off the extracellular polymeric (figure of excess sludge
Middle arrow is signified).Wherein, a, c are original residual sludge；B, d are pretreated excess sludge.In biosurfactant
Under the effect of the physics sub-prime of solubilization and hydraulic cyclone, more loose type EPS become soluble EPS and convert after being stripped
For dissolved organic matter (DOM)., the rheological behavior of pretreated excess sludge significantly improves in the present invention, and sludge is viscous
The trend that is decreased obviously all is presented in degree and viscoelastic parameters, as shown in Figure 4.Fig. 4 is the preprocessed front and back rheological behavior of excess sludge
Variation, significantly show that biosurfactant and the preprocess method of high speed hydraulic cyclone coupling improve the stream of excess sludge
Denaturation: viscosity and viscoplasticity are reduced.Wherein, (a, b) is viscosity change curve, and (c, d) is viscoplasticity change curve；(a, c)
For original residual sludge, (b, d) is excess sludge after pretreatment.This not only contributes to the further stripping of sludge extracellular polymeric
From being also beneficial to the progress of mass transport process in anaerobic fermentation process.
Excess sludge enters in anaerobic fermentation reactor after extracellular polymeric is removed carries out acidogenic fermentation, mainly sharp
It is effective extracellular with anaerobic fermentation and acid production bacterium by the process for the organic matter that complicated larger molecular organics metabolic conversion is small molecule
Polymer removing and dissolution effectively improve the transformation of microorganism.Make environmental benefits by conditions such as control pH, DO, temperature
It in the growth of the Reproduction suppression methanogen of fermentation and acid bacterium, can promote to produce acid accumulation, carry out acidogenic fermentation with the present invention
Result it is as shown in Figure 5.Short chain fatty acids obtain a large amount of during Fig. 5 is that excess sludge is preprocessed and the processing such as anaerobic fermentation
Accumulation carries out the most high yield acid accumulation of anaerobic fermentation up to 3 times or more of original residual sludge after extracellular polymeric is removed.Its
In, O: original residual sludge, P: pretreatment excess sludge, F: anaerobic fermentation sludge.Excess sludge is by the pretreatment and detests
After aerobe fermentation, organic matter itself is more fully utilized, and it is small to be converted into short chain fatty acids for being easier to be utilized by microorganism etc.
Molecular organic, so the present invention can effectively realize the minimizing of sludge, as a result as shown in Figure 6.Fig. 6 is that excess sludge is extracellular poly-
The minimizing of sludge can effectively be realized by closing object removing.Wherein, B3S1, BSS2, B3S3, B3S4 are excess sludge preprocess method mark
Note.
The preprocessed structure composition to extracellular polymeric after extracellular polymeric removing and anaerobic fermentation of 1. excess sludge of table
Variation
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (10)
1. a kind of device for excess sludge extracellular polymeric removing and recycling, which is characterized in that described device includes storage
Mud sump, excess sludge pretreatment unit, short distance anaerobic fermentation unit and excess sludge dewatering unit, in which:
Storage basin, outlet are connect with excess sludge pretreatment unit, for storing the sludge to be processed of input；
Excess sludge pretreatment unit, including dosing premixing pool and hydrocyclone, wherein dosing premixing pool is used for storage basin
The sludge addition surfactant to come is conveyed, organic impurities is separated；Hydrocyclone is stirred for high speed in dosing premixing pool
In be added to the sludge of surfactant；
Short distance anaerobic fermentation unit, including sludge anaerobic fermentation reactor, for hydrocyclone high-speed separation, treated
Sludge carries out anaerobic fermentation processing；
Excess sludge dewatering unit, including sludge concentration tank and dehydration and drying equipment, for fermenting to short distance anaerobic fermentation unit
Treated, and sludge is concentrated and dried.
2. the apparatus according to claim 1, which is characterized in that described device further includes secondary settling tank, and the secondary settling tank is used for
Concentration and returnedactivatedsludge, outlet connect the dosing premixing pool in storage basin and excess sludge pretreatment unit.
3. device according to claim 1 or 2, which is characterized in that be provided with dosing mouth at the top of the dosing premixing pool
And agitating device；
Preferably, the storage basin bottom is connected with excess sludge dewatering unit.
4. device according to claim 1-3, which is characterized in that the sludge in the dosing premixing pool passes through height
Fast centrifugal pump is transported in hydrocyclone, and the high-speed centrifugal pump combines with hydrocyclone and realizes high speed hydraulic cyclone mistake
Journey；
It is formed back preferably, being connect respectively with dosing premixing pool at the top and bottom of the hydrocyclone and installing control valve additional
Stream, for guaranteeing required hydraulic cyclone circulation time.
5. device according to claim 1-4, which is characterized in that set at the top of the sludge anaerobic fermentation reactor
Agitating device adds temperature control external member, pH sensor and/or DO in the main body of the sludge anaerobic fermentation reactor and passes
Sensor.
6. a kind of carry out the removing of excess sludge extracellular polymeric and recycling using the described in any item devices of claim 2-5
Method, which comprises the following steps:
By in storage basin sludge and secondary settling tank import sludge proportionally inject dosing premixing pool；
It measures and mixes excess sludge concentration in dosing premixing pool, surfactant is added；
Make to enter hydrocyclone by the processed excess sludge high speed of biosurfactant；
Pretreated excess sludge is injected and carries out anaerobic fermentation processing in excess sludge anaerobic fermentation reactor；
The fermented sludge in the anaerobic fermentation reactor is discharged, is concentrated drying.
7. according to the method described in claim 6, being kept in it is characterized in that, secondary settling tank excess sludge is injected in storage basin, temporarily
Depositing the time is 1~3d, and the excess sludge in dosing premixing pool keeps in sludge and secondary settling tank import sludge according to 1: 1 by storage basin
Ratio mixes, and the concentration into the mixing excess sludge of hydrocyclone is 15~18g/L.
8. according to the method described in claim 6, it is characterized in that, according to the excess sludge mixed in proportion in dosing premixing pool
Sludge concentration, be added 0.005~0.1g/gTSS surfactant；
Preferably, entering hydrocyclone by the processed excess sludge high speed of biosurfactant and being premixed in dosing
Continue the multiple circulations of eddy flow between pond and hydrocyclone, the duration is 0.5~20min.
9. according to the method described in claim 6, it is characterized in that, by the injection sludge anaerobic fermentation of pretreated excess sludge
In reactor, ferment 2~8d, and pair of fermentation system is monitored and controlled by temperature control external member, pH sensor and/or DO sensor
Parameter is answered, wherein temperature control is 25~40 DEG C, pH are 6.5~8.0, DO is 0.05~1.0.
10. according to the method described in claim 6, it is characterized in that, excess sludge injects excess sludge anaerobic fermentation reactor
Fermentation liquid is obtained after middle anaerobic fermentation processing, subsequent includes: that filters pressing is concentrated first is that passing through to the recycling of fermentation liquid and using method
Broth extraction short chain fatty acids are recycled, are taken off second is that directly pressing filtering liquid is back in sewage treatment denitrification link as sewage
The covering carbon source of nitrogen.
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