CN114477587A - Circulating water and sewage reuse and zero discharge treatment method - Google Patents
Circulating water and sewage reuse and zero discharge treatment method Download PDFInfo
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- 238000011282 treatment Methods 0.000 title claims abstract description 63
- 239000010865 sewage Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 39
- 208000028659 discharge Diseases 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 108
- 238000004064 recycling Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 16
- 239000010802 sludge Substances 0.000 claims abstract description 14
- 238000011033 desalting Methods 0.000 claims abstract description 9
- 238000005189 flocculation Methods 0.000 claims abstract description 8
- 230000016615 flocculation Effects 0.000 claims abstract description 8
- 238000001223 reverse osmosis Methods 0.000 claims description 50
- 239000002351 wastewater Substances 0.000 claims description 28
- 238000000108 ultra-filtration Methods 0.000 claims description 24
- 150000002500 ions Chemical class 0.000 claims description 18
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- 238000011084 recovery Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000003657 drainage water Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
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- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003830 anthracite Substances 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910001424 calcium ion Inorganic materials 0.000 claims description 3
- 238000009295 crossflow filtration Methods 0.000 claims description 3
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- 229910001425 magnesium ion Inorganic materials 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 3
- 239000008234 soft water Substances 0.000 claims description 3
- 230000001954 sterilising effect Effects 0.000 claims description 3
- 238000004659 sterilization and disinfection Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 2
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- 230000008859 change Effects 0.000 claims description 2
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- 238000001035 drying Methods 0.000 claims description 2
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- 238000005265 energy consumption Methods 0.000 claims description 2
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- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
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- 150000003839 salts Chemical class 0.000 abstract description 3
- 238000011221 initial treatment Methods 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 abstract 2
- 231100000719 pollutant Toxicity 0.000 abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
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- 238000010612 desalination reaction Methods 0.000 description 4
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- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
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- 150000001768 cations Chemical class 0.000 description 1
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- 230000008094 contradictory effect Effects 0.000 description 1
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- 230000008025 crystallization Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
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- 239000013505 freshwater Substances 0.000 description 1
- 230000002070 germicidal effect Effects 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Chemical & Material Sciences (AREA)
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a recycling and zero-discharge treatment method for circulating sewage, which mainly comprises three functional treatment units, namely: the sewage treatment system comprises a pretreatment unit, a desalting unit and a zero discharge unit, wherein the three treatment units are used for carrying out primary treatment on sewage through the pretreatment unit, separating sludge in the sewage through operations such as flocculation and the like, removing salt in the sewage through the desalting unit, and finally treating and recycling the sewage through the zero discharge unit. The treatment method disclosed by the invention has the advantages that the treatment process is simple, efficient and environment-friendly, no pollutant of sludge environment is generated after the sewage is treated, the pollutant in the sewage can be recycled after being recovered, and the purposes of economy and environment friendliness are achieved while zero emission is realized.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a recycling and zero-discharge treatment method for circulating sewage.
Background
Evaporation loss, blowing loss and pollution discharge loss in a circulating water cooling system account for about 70-80% of the production water consumption of the whole plant, the concentration rate of circulating cooling water and the recycling of circulating water sewage are improved, the method is a main way for saving water taking and reducing pollution discharge in the existing circulating cooling thermal power plant, the conductivity of the circulating water sewage is 500-3000 mu s/cm, the salt content is about 275-2250 mg/L, the concentration rate of the circulating water is improved up to the upper limit due to ten items of water and the increase of environmental protection pressure, and if the circulating water sewage cannot be rapidly treated in time, the risk of scaling of equipment such as a condenser can be caused.
Therefore, by implementing recycling and zero discharge treatment of the circulating water sewage, the problems of difficult discharge of the circulating water wastewater of the thermal power plant and the like are solved, and meanwhile, the sludge solidification treatment can be carried out on the sludge with higher content in the circulating water sewage through flocculation precipitation.
Based on this, the Chinese patent application numbers are: CN201410136571.8 discloses a 'recycling system for circulating sewage by a membrane method', and the processing system discloses the following processing method:
the recycling system of the circulating water sewage by the membrane method comprises water treatment processes of alkaline combined softening, ozone-biological activated carbon, ultrafiltration, reverse osmosis, electrodialysis and the like. Aiming at the water quality characteristics of circulating water and sewage of a thermal power plant, the process comprises the steps of firstly adopting processes such as alkaline softening, ozone-biological activated carbon treatment and the like to pretreat raw water, then adopting ultrafiltration and reverse osmosis double-membrane treatment processes, enabling reverse osmosis concentrated drainage to enter an electrodialysis device for concentration treatment, and carrying out solidification treatment on a small amount of electrodialysis strong brine. The invention adopts alkaline softening and ozone-biological activated carbon pretreatment processes, can effectively reduce the content of scaling components and refractory organic matters in water, and realizes the maximum reduction of the wastewater with high salt content at the tail end through electrodialysis concentration treatment, so the invention has the characteristics of good operation stability, low pollution and blockage of reverse osmosis membranes, high overall recovery rate of the system and the like.
However, the efficiency of sewage treatment by adopting the above treatment process is too low, the effect is not ideal, complete sewage treatment cannot be realized, zero emission is realized, and no pollution is generated.
Disclosure of Invention
Based on the background, the invention aims to provide a method for recycling and zero-discharge treatment of circulating sewage.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for recycling and zero-emission treatment of circulating sewage comprises the following steps:
the sewage is treated by sequentially passing through a regulating tank (1), a clarification tank (2), a raw water tank (3), a medium filter (12), an ion rod water treatment device (13), an ultrafiltration device (16), a first reverse osmosis device (21), a second reverse osmosis device (26), an EDI device (30) and a desalting water tank (31);
wherein, the scum of the clarification tank (2) is treated by a sludge tank (4), a concentration tank (5) and a centrifugal dehydrator (6), and the supernatant of the concentration tank (5) and the water separated by the centrifugal dehydrator (6) are sent to a recovery water tank (7) and recycled to the adjusting tank (1);
the sludge is dried by a centrifugal dehydrator (6) and then is transported outside;
concentrated drainage water and the like of a desalting unit collected by a first wastewater tank (32) pass through a wastewater pretreatment system (33) and a fiber filter (34) and then enter a second wastewater tank (35), an ion exchanger (37), a soft water tank (38) and a third reverse osmosis device (42) together with concentrated water of a first reverse osmosis device (21) to an MVR (mechanical vapor recompression) for treatment, and zero emission treatment is carried out.
Preferably, the medium filter (12) adopts one or two of quartz sand and anthracite as a filter medium;
the medium filter (12) control system is controlled by differential pressure and timing, when the set value of the system is reached, the air-water backwashing is carried out by adopting the air inlet of the fan, and the generated backwashing sewage is collected to the first wastewater tank (32) through a drainage channel.
Preferably, the sewage discharged by the circulating water is softened by a double-alkali method, lime and sodium carbonate are added into the clarification tank (2) for treatment, sodium hypochlorite and polyferric are added into the clarification tank (2) for flocculation sterilization treatment, and generated scum is conveyed to the sludge tank (4) through a scum discharge pipe for sludge dewatering and drying treatment.
Preferably, the ultrafiltration device (16) adopts an external pressure type cross-flow filtration mode;
concentrated water generated by the ultrafiltration device (16) is collected to a first wastewater tank (32) through a drainage channel, and ultrafiltration backwashing drainage water is sent to a water inlet main pipe of the clarification tank (2) for recycling.
Preferably, the water inlet ends of the ultrafiltration device (16), the first reverse osmosis device (21), the second reverse osmosis device (26), the EDI device (30) and the third reverse osmosis device (42) are respectively provided with a self-cleaning filter (15), a first security filter (19), a second security filter (24), a third security filter (29) and a fourth security filter (40);
the filtering precision of the self-cleaning filter (15), the first security filter (19), the second security filter (24), the third security filter (29) and the fourth security filter (40) is respectively 50 mu m, 5 mu m, 3 mu m, 1 mu m and 5 mu m.
Preferably, the first reverse osmosis device (21) and the third reverse osmosis device (42) adopt low-pressure anti-pollution composite membranes and are arranged in a one-stage two-stage mode, and the second reverse osmosis device (26) adopts a high-desalination-rate low-energy-consumption membrane module and is arranged in a one-stage two-stage mode.
Preferably, the wastewater pretreatment system (33) treatment process comprises the following steps:
and pumping the wastewater into a pipeline mixer through a wastewater delivery pump, adding chemicals into the pipeline mixer to mix with the bactericide flocculant, reacting and clarifying through a flocculation reaction tank and an inclined plate clarifier, flowing into a final neutralization pond, adjusting the pH value, and overflowing to a clean water pond for recycling.
Preferably, the concentrated water generated by the second reverse osmosis device (26) is recycled to the ultrafiltration water generating tank (17), the concentrated water generated by the EDI device (30) is recycled to the first reverse osmosis water generating tank (22), and the electrode water of the EDI device (30) is discharged outdoors through an exhaust pipeline.
Preferably, the ion rod water treatment device (13) directly acts on the ion rod by adopting static electricity to change the crystal structure of the medium.
Preferably, the ion exchanger (37) adopts a sodium type cation exchange resin to remove residual calcium and magnesium ions, and a resin catcher is arranged at the outlet of the ion exchanger (37).
The invention has the following beneficial effects:
1. the ion rod water processor adopts a rod type structure, utilizes a pipeline to replace a shell to carry out electrochemical descaling, is convenient to install and disassemble, and has a simple, high-efficiency and environment-friendly treatment process.
2. The ultrafiltration device adopts an external pressure type cross flow filtration mode, increases the filtration area and is convenient to meet the requirements of an intermittent and continuous operation mode.
3. The wastewater pretreatment system adopts a coagulation clarification treatment process, removes hardness, alkalinity, silicon and suspended matters in wastewater through a reaction tank, an inclined plate clarifier, a neutralization pond, a clean water tank and the like, adopts a treatment process of 'ion exchanger + reverse osmosis + evaporative crystallization' in a zero-emission unit, and is provided with a sodium type strong acid cation exchanger before the third reverse osmosis to remove residual calcium and magnesium ion hardness and ensure that reverse osmosis and MVR evaporative crystallizers are not scaled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a pre-processing unit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a desalination unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a zero-emission unit in an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1 to 3, a method for recycling and zero-emission treatment of circulating sewage is divided into treatment functions; the system comprises a pretreatment unit, a desalting unit, a zero discharge unit and three treatment units.
The pretreatment unit is an initial treatment unit and specifically comprises the following steps:
according to the sewage water flow treatment process trend, sewage passes through an adjusting tank 1, a clarification tank 2 and a raw water tank 3 in sequence, after the adjusting tank 1 is added with acid to adjust the pH value, the sewage is sent to the clarification tank 2 for treatment through a raw water booster pump, and after the effluent is qualified, the effluent is collected and collected to the raw water tank 3 through a water collecting tank.
Adopt two alkali (lime + sodium carbonate) to throw the pipeline and add from 2 tops of clarifier, establish the mixer in the pond and accelerate the flocculation and precipitation, 2 inlet channels of clarifier establish sodium hypochlorite germicide and polyferric flocculant dosing point, before being located the pipe-line mixer, the dross that the flocculation produced is sent to sludge impoundment 4 through arranging the dross pipeline, send 5 concentrated processes in the concentrated pond by mud pump 9, the top supernatant overflows to 7 retrieval and utilization in recovery water pond, mud after the concentration is carried by sludge pump 10 to centrifugal dehydrator 6 and is added the medicine and handle into the mud cake, transport outward as solid waste and handle.
The waste water after the pretreatment unit treatment is stored in the raw water tank 3 and is subjected to desalination treatment through a desalination unit, wherein the desalination unit comprises the following specific components:
the process adopts a 'medium filter + ultrafiltration + two-stage reverse osmosis + EDI' full-membrane water treatment process, an outlet of a raw water tank 3 is connected with an inlet of a medium filter 12 through a raw water pump 11, the medium filter 12 is filled with anthracite of 400mm and quartz sand of 800mm, an outlet pipe is provided with an ion rod water treatment device 13, the installation and the disassembly are convenient, simultaneously, the effects of descaling, sterilization and the like can be realized through an electrochemical method, the water enters an ultrafiltration device 16 through a self-cleaning filter 15 through an ultrafiltration water pump 14, and the recovery rate of the ultrafiltration device 16 is controlled to be 95%.
In the concentrated water that produces got into zero discharge unit's first wastewater disposal basin 32, ultrafiltration device 16 produced water and gets into ultrafiltration product water tank 17, and ultrafiltration product water tank 17 material is the stainless steel, goes out water and is filtered the back by first reverse osmosis feed pump 18 through first safety filter 19, gets into first reverse osmosis unit 21 after stepping up by first high-pressure pump 20 frequency conversion, and first reverse osmosis unit 21 adopts six core dress, according to 15: 8 are arranged in a one-stage two-stage arrangement mode.
The recovery rate of the first reverse osmosis device 21 is controlled to be 80%, produced water enters the first reverse osmosis water production tank 22, concentrated water is delivered to the zero-emission unit for treatment, water entering the second reverse osmosis device 26 enters the second reverse osmosis device 26 from an outlet pipeline of the first reverse osmosis water production tank 22 through the second reverse osmosis water supply pump 23 to the second security filter 24, the water enters the second reverse osmosis device 26 through the second high-pressure pump 25 in a frequency conversion and pressure boosting mode, the concentrated water of the second reverse osmosis device 26 is recycled to the ultrafiltration water production tank 17, and the second reverse osmosis device 26 is installed in a six-core mode according to the following steps of 9: 4, controlling the recovery rate of the second reverse osmosis device 26 to be 90%, enabling produced water to enter an EDI water supply tank 27, enabling the outlet water of the EDI water supply tank 27 to be connected with an EDI device 30, conveying the outlet water by an EDI water supply pump 28 in the middle and filtering the outlet water by a third security filter 29, enabling concentrated water of the EDI device 30 to be recycled to the first reverse osmosis water production tank 22, arranging an exhaust pipeline for polar water to be discharged outdoors, and enabling the EDI device 30 to produce water to a desalting water tank 31.
A zero-emission treatment unit:
the incoming water is mainly concentrated water of the first reverse osmosis device 21 and concentrated drainage water of the treated desalting unit, and is collected to the first wastewater tank 32, and comprises backwashing drainage water of the medium filter 12, concentrated water of the ultrafiltration device 16 and the like. The wastewater collected by the first wastewater tank 32 is treated by the wastewater pretreatment system 33 and the fiber filter 34, and then passes through the second wastewater tank 35, the ion exchanger 37, the soft water tank 38 and the third reverse osmosis device 42 together with the concentrated water of the first reverse osmosis device 21 to be treated, and the produced water is sent to the fresh water tank 43 to be reused as the recycled water for replenishing and the recycled water of the ion exchanger 37.
The concentrated water of the third reverse osmosis device 42 is collected to a concentrated water tank 44, enters a heater 47 from a preheater 46 through a concentrated water pump 45, is subjected to gas-liquid separation in a crystallizer 48 after being heated and warmed, the secondary steam evaporated by the crystallizer 48 enters a compressor 49 after being separated, the compressed steam is sent to the heater 47 to heat materials, the generated steam condensate water enters the preheater 46 to recover heat, the materials concentrated by the crystallizer 48 are subjected to solid-liquid separation through a centrifuge 50, the solids are bagged and transported out, and the liquid flows into a mother liquid tank from the beginning and flows back to the heater 47 through the mother liquid pump.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A method for recycling and zero-emission treatment of circulating sewage is characterized by comprising the following steps:
the sewage is treated by sequentially passing through a regulating tank (1), a clarification tank (2), a raw water tank (3), a medium filter (12), an ion rod water treatment device (13), an ultrafiltration device (16), a first reverse osmosis device (21), a second reverse osmosis device (26), an EDI device (30) and a desalting water tank (31);
wherein, the scum of the clarification tank (2) is treated by a sludge tank (4), a concentration tank (5) and a centrifugal dehydrator (6), and the supernatant of the concentration tank (5) and the water separated by the centrifugal dehydrator (6) are sent to a recovery water tank (7) and recycled to the adjusting tank (1);
the sludge is dried by a centrifugal dehydrator (6) and then is transported outside;
concentrated drainage water and the like of a desalting unit collected by a first wastewater tank (32) pass through a wastewater pretreatment system (33) and a fiber filter (34) and then enter a second wastewater tank (35), an ion exchanger (37), a soft water tank (38) and a third reverse osmosis device (42) together with concentrated water of a first reverse osmosis device (21) to an MVR (mechanical vapor recompression) for treatment, and zero emission treatment is carried out.
2. The method for recycling and zero-emission treatment of the circulating sewage according to claim 1, wherein the medium filter (12) adopts one or two mixed substances of quartz sand and anthracite as a filter medium;
the medium filter (12) control system is controlled by differential pressure and timing, when the set value of the system is reached, the air-water backwashing is carried out by adopting the air inlet of the fan, and the generated backwashing sewage is collected to the first wastewater tank (32) through a drainage channel.
3. The recycling and zero-emission treatment method of the circulating sewage according to claim 1, characterized in that the circulating sewage is softened by a double alkali method, lime and sodium carbonate are added into the clarification tank (2) for treatment, sodium hypochlorite and polyferric are added into the clarification tank (2) for flocculation sterilization treatment, and the generated scum is sent to a sludge tank (4) through a scum discharge pipe for sludge dewatering and drying treatment.
4. The method for recycling and zero-discharge treatment of the recycled water sewage according to claim 1, wherein the ultrafiltration device (16) adopts an external pressure type cross flow filtration mode;
concentrated water generated by the ultrafiltration device (16) is collected to a first wastewater tank (32) through a drainage channel, and ultrafiltration backwashing drainage water is sent to a water inlet main pipe of the clarification tank (2) for recycling.
5. The method for recycling and zero-emission treatment of the circulating wastewater according to claim 1, wherein the water inlet ends of the ultrafiltration device (16), the first reverse osmosis device (21), the second reverse osmosis device (26), the EDI device (30) and the third reverse osmosis device (42) are respectively provided with a self-cleaning filter (15), a first safety filter (19), a second safety filter (24), a third safety filter (29) and a fourth safety filter (40);
the filtering precision of the self-cleaning filter (15), the first security filter (19), the second security filter (24), the third security filter (29) and the fourth security filter (40) is respectively 50 mu m, 5 mu m, 3 mu m, 1 mu m and 5 mu m.
6. The method for recycling and zero-emission treatment of recycled sewage of claim 1, wherein the first reverse osmosis device (21) and the third reverse osmosis device (42) are arranged in a one-stage two-stage mode by adopting a low-pressure anti-pollution composite membrane, and the second reverse osmosis device (26) is arranged in a one-stage two-stage mode by adopting a high-desalination-rate low-energy-consumption membrane module.
7. The method for recycling and zero-emission treatment of recycled sewage of claim 1, wherein the treatment process of the wastewater pretreatment system (33) comprises the following steps:
and pumping the wastewater into a pipeline mixer through a wastewater delivery pump, adding chemicals into the pipeline mixer to mix with the bactericide flocculant, reacting and clarifying through a flocculation reaction tank and an inclined plate clarifier, flowing into a final neutralization pond, adjusting the pH value, and overflowing to a clean water pond for recycling.
8. The method for recycling and zero-emission treatment of recycled sewage of claim 1, wherein the concentrated water generated by the second reverse osmosis device (26) is recycled to the ultrafiltration water generating tank (17), the concentrated water generated by the EDI device (30) is recycled to the first reverse osmosis water generating tank (22), and the electrode water of the EDI device (30) is discharged to the outside through an exhaust pipeline.
9. The method for recycling and zero-emission treatment of circulating sewage according to claim 1, wherein the ion rod water treatment device (13) directly acts on the ion rod by adopting static electricity to change the crystal structure of a medium.
10. The method for recycling and zero-emission treatment of the circulating water and sewage as claimed in claim 1, wherein the ion exchanger (37) adopts a sodium type cation exchange resin, and residual calcium and magnesium ions are removed by the ion exchanger (37);
the outlet of the ion exchanger (37) is provided with a resin catcher.
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