CN102583743A - Dual-sludge denitrification dephosphorizing and denitrifying A/A-O device and method - Google Patents
Dual-sludge denitrification dephosphorizing and denitrifying A/A-O device and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 98
- 241000894006 Bacteria Species 0.000 claims abstract description 40
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 24
- 239000011574 phosphorus Substances 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 27
- 239000010865 sewage Substances 0.000 claims description 26
- 238000005273 aeration Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 16
- 238000011010 flushing procedure Methods 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 238000010992 reflux Methods 0.000 claims description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 11
- 229920000388 Polyphosphate Polymers 0.000 claims description 10
- 229920000037 Polyproline Polymers 0.000 claims description 10
- 239000001205 polyphosphate Substances 0.000 claims description 10
- 235000011176 polyphosphates Nutrition 0.000 claims description 10
- 238000004062 sedimentation Methods 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 239000000706 filtrate Substances 0.000 claims description 8
- 239000006228 supernatant Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 6
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- 230000005484 gravity Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 3
- 150000002823 nitrates Chemical class 0.000 claims description 3
- 150000007524 organic acids Chemical class 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract 8
- 241000108664 Nitrobacteria Species 0.000 abstract 1
- 238000007872 degassing Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 238000011001 backwashing Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
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- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
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- 230000001651 autotrophic effect Effects 0.000 description 2
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- 206010016825 Flushing Diseases 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
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- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a dual-sludge denitrification dephosphorizing and denitrifying A/A-O device which mainly comprises a primary precipitation pool, an anaerobic-anoxic device, a secondary precipitation pool, a middle pool, a biological aerated filter and a clear water pool, wherein the primary precipitation pool is connected with an anaerobic zone of the anaerobic-anoxic device, a degassing zone of the anaerobic-anoxic device is connected with the secondary precipitation pool, and the secondary precipitation pool is connected with the anaerobic zone of the anaerobic-anoxic device through a sludge pump; the outflow water of the secondary precipitation pool is connected to the middle pool, the middle pool is connected with the biological aerated filter, and the biological aerated filter is connected with the clear water pool; and the clear water pool is connected with the anaerobic-anoxic device. By the process adjustment, denitrifying phosphorus accumulating bacteria becomes dominant bacteria of an AAO unit. The dual-sludge denitrification dephosphorizing and denitrifying A/A-O device realizes the separation of phosphorus accumulating bacteria and nitrobacteria, the separation of the precipitation function and the sludge storage function of the secondary precipitation pool, and the separation of the nitrification function and the filtering function of the biological aerated filter, thereby realizing energy conservation of a combined system, stability and efficiency in denitrification and dephosphorization, and sludge reduction.
Description
Technical field
The invention belongs to the dirty water living creature processing technique field, be specially adapted to carrying of sewage work and mark the newly-built of transformation and advanced treatment of wastewater factory, be specifically related to a kind of A/A-O apparatus and method that are used for the strengthened denitrification of WWT.
Background technology
At present, the sewage work of China more than 95% can not reach the one-level A emission standard of increasingly stringent, and key issue is that TN, TP and SS can't stably reaching standards.Because China town sewage C/N is generally lower; It is lower to be used for the VFA of anaerobic phosphorus release, need add a large amount of additional carbons in the biological carbon and phosphorous removal treating processes, and Sewage Plant does not adopt energy-saving and cost-reducing technology yet; Make working cost generally higher, ton water running expense is nearly 2 times of developed country.And a large amount of excess sludge that Sewage Plant produces can not get dealing carefully with, and the environmental problem that causes also relatively significantly.
PolyP bacteria, denitrifying bacteria and nitrifier coexistence in the AAO denitrification dephosphorization system; There is contradiction and competition carbon source on of mud on age; Make that polyP bacteria anaerobic phosphorus release efficient is not high; The nitrifier nitrification efficiency is low, and aeration energy consumption is big, is difficult in the good result that obtains denitrogenation dephosphorizing in the single biochemical system simultaneously; And the nitric nitrogen in the aerobic zone water outlet is prone to denitrification takes place in second pond, makes the mud come-up, influences the normal operation of system.Because China town sewage C/N is generally lower, it is lower to be used for the VFA of anaerobic phosphorus release, and the shortage of carbon source makes that the problem that exists originally in the AAO technology denitrogenation dephosphorizing is more outstanding.
BAF (Biological Aerated Flilter; BAF) be the sewage disposal technology of the degraded of collection biomembrane biochemistry and filtering layer filtering function and one; The ubiquity work period was short when but BAF was used for handling sewage separately; Back flushing is frequent, and filler be prone to stop up and problem such as harden.
AAO-BAF integrates AAO and BAF advantage, and anti-hydraulic load ability is strong, and is strong to the temperature variation adaptive faculty; Through separating of polyP bacteria and nitrifier, can stablize and realize the denitrification dephosphorization technology, realize that a carbon is dual-purpose; Save aeration rate, reduce sludge yield, reduce working cost.But also there are some problems in this combination process, and DO is higher like the BAF water outlet, makes aerobic heterotrophic bacterium breeding in the oxygen-starved area, AAO unit, restriction AAO denitrification dephosphorization efficient; The pollutent that upward flow BAF holds back is mainly in the filter material layer bottom, and the pollutent of holding back when forward recoiling passes whole filter material layer, and not only the energy consumption height also makes BAF top clear water polluted; Owing to the interference of aeration has slackened the strainability of BAF, it is higher that the microbial film that comes off etc. is used water suspension SS.
How on energy-saving and cost-reducing and the basis that effectively utilizes former water carbon source, improve the denitrogenation dephosphorizing effect of combined process system, realize mud process decrement simultaneously, become the great demand of present stage sewage treatment area.
Summary of the invention
The objective of the invention is to present AAO technological problems; In conjunction with energy-saving and cost-reducing, carbon source is effectively utilized and three gordian techniquies of mud decrement, proposes a kind of waste disposal plant and method, makes the denitrification phosphorus-collecting bacterium become the unitary superiority bacteria spp of AAO through the technology adjustment; Realize separating of polyP bacteria and nitrifier; Separating of second pond deposition and storage mud function, BAF nitrated with the separating of filtering function, realize finally that combined system is energy-conservation, stable, high-efficient denitrification and dephosphorization and mud decrement.
In order to reach above-mentioned purpose of design, the technical scheme that the present invention adopts is following:
The device of a kind of A/A-O of double sludge denitrification dephosphorization denitrogenation mainly is made up of preliminary sedimentation tank, anaerobic-anoxic device, second pond, intermediate pool, BAF and clean water basin; Said preliminary sedimentation tank is connected with the anaerobic zone of anaerobic-anoxic device, and the degas zone of anaerobic-anoxic device is connected with second pond, and second pond is connected with the anaerobic zone of anaerobic-anoxic device through sludge pump; The water outlet of said second pond is connected to intermediate pool, and intermediate pool is connected with BAF, and said BAF is connected to clean water basin; Said clean water basin are connected with the oxygen-starved area of anaerobic-anoxic device; Said clean water basin are connected with BAF bottom water distributing area.
Preferably, the packing layer of said BAF is provided with two phase separator, and two phase separator is connected with the degas zone of air pump with the anaerobic-anoxic device through valve.
Preferably, said second pond is provided with delivery pipe; Said BAF bottom is provided with blow-off valve; Said clean water basin are provided with rising pipe.
More preferably, the device of said double sludge denitrification dephosphorization denitrogenation also comprises gas blower, and gas blower is connected with BAF through the gentle flowmeter body of aeration pipeline.
More preferably, said BAF is nitrated/reactor drum, and the filtrate bottom is nitrated section, and nitrated deoxidation fillter section is disturbed for no gas in top.
A kind of A/A-O method of double sludge denitrification dephosphorization denitrogenation, the concrete steps of this method are:
1) sewage gets into the anaerobic zone of anaerobic-anoxic device from preliminary sedimentation tank; In the anaerobic zone releases phosphorus, muddy water mixed solution is under action of gravity, with the formula of seething the flow through anaerobic zone and the oxygen-starved area of anaerobic-anoxic device; Carry out denitrification dephosphorization denitrification and remove organism, and in degas zone, outgas;
2) sewage gets into second pond from above-mentioned degas zone, realizes mud-water separation, and the supernatant that contains ammonia nitrogen flows into intermediate pool, gets into the BAF bottom through HPP; Mud is discharged through delivery pipe;
3) the superiority bacteria spp nitrifier in the above-mentioned BAF is converted into nitric nitrogen with the ammonia nitrogen in the above-mentioned supernatant, and its hydraulic detention time is 0.5-1h, and GWR is 6-10, and nitrification liquid gets into clean water basin after filtration and deoxidation, and treating water discharges through rising pipe;
4) the rich phosphorus sludge that does not contain nitrate salt in the second pond gets into the anaerobic zone of anaerobic-anoxic device in the above-mentioned steps 2 through sludge reflux pump; Establish whipping appts in the pond, return sludge ratio is 100%, and hydraulic detention time is 1-2h; PolyP bacteria in the mud utilizes the low molecular weight volatile property organic acid (VFA) in the sewage; Synthetic PHB accomplishes a large amount of releases of phosphorus, and it is high to release phosphorus speed; Large amount of organic is transformed rapidly in the sewage, accounts for the 70-80% of combination process in the removal of 4 couples of COD of anaerobic zone; The denitrification phosphorus-collecting bacterium accounts for the ratio of polyP bacteria near 80%;
5) mixing sludge in the step 4 gets into the oxygen-starved area from above-mentioned anaerobic zone, establishes whipping appts in the pond, and the deoxidation nitrification liquid of the clean water basin of BAF entering simultaneously gets into the oxygen-starved area through the nitrification liquid reflux pump; Dissolved oxygen concentration in the oxygen-starved area is very low, and DO has suppressed the predation of aerobic heterotrophic bacterium to carbon source less than 0.3mg/L; Denitrifying bacteria utilizes the remaining carbon source denitrification denitrogenation of polyP bacteria in the anaerobic zone; The denitrification phosphorus-collecting bacterium is an electron acceptor(EA) with the nitrate nitrogen, is electron donor with PHB, and denitrification dephosphorization takes place; The nitrification liquid reflux ratio is 200-400%, and its hydraulic detention time is 7-8h;
6) mixing sludge in the step 5 flows into degas zone from the oxygen-starved area; The degas zone hydraulic detention time is 1h, and the oxidation of ammonia nitrogen does not take place, and main effect is to accomplish the stripping of nitrogen and the removal of phosphoric residue; Improve the sludge settling performance, the mixed solution sludge concentration is 2500-3000mg/L;
7) sewage gets into second pond from above-mentioned degas zone, realizes mud-water separation, and mud is discharged through delivery pipe, and supernatant flows into intermediate pool, gets into BAF through HPP, handles the back at BAF and discharges.
Preferably, the two phase separator that is arranged at the filtrate middle part of BAF is collected weary gas, in the degas zone of anaerobic-anoxic device, realizes the secondary aeration through the aeration pipeline, accomplishes the stripping to nitrogen, improves sludge settling property.
More preferably, said BAF is after the operation of 10-15d, and middle water layer concentration of suspension significantly increases and take place the release of phosphorus, and BAF is carried out back flushing, the suspended substance of water layer in the middle of absorbing.Gas, water backwashing strength are 3-7L/ (m2.s), and the time is respectively gas towards 2-5min, and air water is towards 2-4min, and water is towards 3-6min.
More preferably; Said BAF back flushing water inlet is the water outlet of clean water basin; Contain the water shoot discharging of the back flushing draining of a large amount of pollutents through water layer in the middle of being arranged on, not disturbance BAF top clear water layer during recoil shortens the recoil running time.
The beneficial effect of the A/A-O device and method of double sludge denitrification dephosphorization denitrogenation of the present invention is: the system sludge productive rate is low; The BAF strainability is strong and backwashing period is long, realizes under the low C/N condition that municipal effluent is efficient, stable, suspended substance is removed in the advanced nitrogen dephosphorization.
Combination process has been used denitrification dephosphorization technology to the full extent, and the system sludge productive rate is low, and energy consumption is low, and the BAF strainability is strong and backwashing period is long, realizes under the low C/N condition that municipal effluent is efficient, stablizes, the advanced nitrogen dephosphorization removes suspended substance.
The AA-BAF combination process is realized separating of polyP bacteria and nitrifier, and nitrification efficiency is high, and all mud all pass through complete anaerobism anoxic process, and denitrogenation dephosphorizing power is strong;
The denitrification dephosphorization The Application of Technology realizes the dual-purpose process decrement with mud of a carbon;
The AA unit is not nitrated, and nitric nitrogen has been alleviated the come-up or the disintegration of mud in the second pond to the influence of anaerobic phosphorus release in the removal returned sluge, guarantees the steady running of second pond;
The setting of two phase separator among the BAF realizes nitrated and filtering the separation, eliminates aeration to filtering disturbance, intensive filtration function, the effectively catching suspended substance that microbial film etc. forms that comes off;
The setting of two phase separator among the BAF reduces the DO of nitrification liquid in refluxing, and suppresses in the oxygen-starved area, AA unit aerobic heterotrophic bacterium to the competition of carbon source, improves the anaerobic environment of denitrifying bacteria and denitrifying phosphorus removing bacteria in the AA unit, raising denitrogenation dephosphorizing efficient;
BAF back flushing draining is through being arranged on the water shoot discharging of the middle water layer of BAF, not disturbance BAF top clear water layer during recoil, backwash operation time weak point.
Description of drawings
Fig. 1 is the structural representation of the A/A-O device of double sludge denitrification dephosphorization denitrogenation of the present invention;
Wherein: the 1-preliminary sedimentation tank; 2-storage mud denitration pond; 3-anaerobic-anoxic device; The 4-anaerobic zone; The 5-oxygen-starved area; The 6-degas zone; The 7-second pond; The 8-intermediate pool; The 9-HPP; The 10-BAF; The 11-clean water basin; The 12-rising pipe; 13-nitrification liquid reflux pump; The 14-sludge reflux pump; The 15-gas blower; The 16-gas meter; The 17-two phase separator; The 18-air valve; The 19-air pump; The 20-backwashing pump; 21-back flushing water intaking valve; 22-back flushing water shoot; The 23-blow-off valve; The 24-delivery pipe.
Embodiment
Below in conjunction with accompanying drawing optimum implementation of the present invention is done further detailed description.
As shown in Figure 1, the A/A-O device of the described double sludge denitrification dephosphorization denitrogenation of the embodiment of the invention mainly is linked in sequence by preliminary sedimentation tank 1, anaerobic-anoxic device 3, second pond 7, intermediate pool 8, BAF 10 and clean water basin 11 and forms; Said anaerobic-anoxic device 3 is the AA device of AAO treatment process; Said preliminary sedimentation tank 1 is connected with the anaerobic zone 4 of anaerobic-anoxic device 3 through intake pump 2; Muddy water mixed solution under action of gravity, the flow through oxygen-starved area 5 and degas zone 6 of anaerobic-anoxic device 3, the degas zone 6 of anaerobic-anoxic device 3 is connected with second pond 7, and second pond 7 passes through sludge pump 14 and is connected with the anaerobic zone 4 of anaerobic-anoxic device 3; After mud gets into second pond 7; Pump is to the anaerobic zone circulation of anaerobic-anoxic device 3, and said second pond 7 is provided with delivery pipe 24, and excess sludge is discharged from delivery pipe 24; The water outlet of said second pond 7 is connected to intermediate pool 8, and intermediate pool 8 is connected with BAF 10 through HPP 9, and said BAF 10 is connected to clean water basin 11, and clean water basin 11 are provided with rising pipe 12.
Said clean water basin 11 are connected with the oxygen-starved area 5 of anaerobic-anoxic device 3 through nitrification liquid reflux pump 13, make the interior nitrification liquid that forms of BAF be back to anaerobic-anoxic device 3 as electron acceptor(EA); Said clean water basin 11 are connected with BAF 10 bottom water distributing areas with valve 21 through backwashing pump 20, and the water in the clean water basin 11 is back to BAF 10 as recoil water; The packing layer of said BAF 10 is provided with the two phase separator 17 that is used to collect weary gas, and two phase separator 17 is connected with the degas zone 6 of anaerobic-anoxic device 3 with air pump 19 through air valve 18; During use; The weary gas that two phase separator 17 in the BAF 10 is collected is realized the secondary aeration through aeration pipeline and aerator in the degas zone of anaerobic-anoxic device 3; Completion improves the sludge settling performance to the stripping of nitrogen, reduces the biosystem aeration energy consumption; BAF 10 middle parts of upward flow do not have filtrate, water layer in the middle of forming, and not disturbance BAF 10 top clear water layers during back flushing, the draining of recoil water is discharged from the water shoot 22 of BAF 10; Said BAF 10 bottoms are provided with blow-off valve 23.
Said BAF 10 is nitrated/reactor drum, and the filtrate bottom is nitrated section, is dominant bacteria this autotrophic type nitrifier, accomplishes the nitrated of ammonia nitrogen, holds back suspended substance simultaneously; Nitrated deoxidation fillter section is disturbed for no gas in top; When efficiently holding back the suspended substance that the microbial film that comes off etc. forms; Utilize remaining dissolved oxygen to accomplish the oxidation of residue ammonia nitrogen, thereby further reduce dissolved oxygen, guarantee that the water outlet SS of LDO concentration reaches one-level A emission standard.
The device of said double sludge denitrification dephosphorization denitrogenation also comprises gas blower 15, and gas blower 15 is connected with BAF 10 through the gentle flowmeter body 16 of aeration pipeline.
It is following to utilize this device specifically to carry out the sanitary sewage disposal process:
1) sewage gets into the anaerobic zone 4 of anaerobic-anoxic device 3 from preliminary sedimentation tank 1; In anaerobic zone 4 releases phosphorus, muddy water mixed solution is under action of gravity, with the formula of seething the flow through anaerobic zone 4 and oxygen-starved area 5 of anaerobic-anoxic device 3; Carry out denitrification dephosphorization denitrification, and in degas zone 6, remove the nitrogen bubble of generation;
2) sewage gets into second pond 7 from above-mentioned degas zone 6, realizes mud-water separation, and the supernatant that contains ammonia nitrogen flows into intermediate pool 8, gets into BAF 10 bottoms through HPP 9; Mud is discharged through delivery pipe 24, and second pond 7 is stable, and mud come-up or disintegration do not take place;
3) the superiority bacteria spp nitrifier in the above-mentioned BAF is converted into nitric nitrogen with ammonia nitrogen, and its hydraulic detention time is 1h, and GWR is 6, and nitrification liquid gets into clean water basin 11 after filtration and deoxidation, and treating water is through rising pipe 12 dischargings;
4) the rich phosphorus sludge that does not contain nitrate salt in the second pond 7 gets into the anaerobic zone 4 of anaerobic-anoxic devices 3 in the above-mentioned steps 2 through sludge reflux pump 14; Establish whipping appts in the pond, return sludge ratio is 100%, and hydraulic detention time is 2h; PolyP bacteria in the mud utilizes the low molecular weight volatile property organic acid (VFA) in the sewage; Synthetic PHB accomplishes a large amount of releases of phosphorus, and it is high to release phosphorus speed; Large amount of organic is transformed rapidly in the sewage, accounts for 80% of combination process in the removal of 4 couples of COD of anaerobic zone; The denitrification phosphorus-collecting bacterium accounts for the ratio of polyP bacteria near 80%;
5) mixing sludge in the step 4 is established whipping appts from above-mentioned anaerobic zone 4 entering oxygen-starved areas 5 in the pond, and the deoxidation nitrification liquid of BAF 10 entering clean water basin 11 is through nitrification liquid reflux pump 13 entering oxygen-starved areas 5 simultaneously; Dissolved oxygen concentration in the oxygen-starved area 5 is very low, less than 0.3mg/L, has suppressed the predation of aerobic heterotrophic bacterium to carbon source; Denitrifying bacteria utilizes the remaining carbon source denitrification denitrogenation of polyP bacteria in the anaerobic zone; The denitrification phosphorus-collecting bacterium is an electron acceptor(EA) with the nitrate nitrogen, is electron donor with PHB, and denitrification dephosphorization takes place; The nitrification liquid reflux ratio is 300%, and its hydraulic detention time is 8h;
6) muddy water mixed solution in the step 55 flows into degas zones 6 from the oxygen-starved area; Degas zone 6 hydraulic detention times are merely 1h, and the oxidation of ammonia nitrogen does not take place, and main effect is to accomplish the removal of phosphoric residue and the stripping of nitrogen; Improve the sludge settling performance, the mixed solution sludge concentration is 2200mg/L;
7) sewage gets into second pond 7 from above-mentioned degas zone 6, realizes mud-water separation, and mud is discharged through delivery pipe 24, and supernatant flows into intermediate pool 8, gets into BAF 10 through HPP 9, handles the back at BAF 10 and flows into clean water basin.
Said this device specifically carries out sewage treatment process and has also added gas blower 15: gas blower 15 through gas meter 16 and aeration pipeline from BAF 10 bottom aerations; The two phase separator 17 that is arranged at the filtrate middle part of BAF 10 is collected weary gas, in the degas zone 6 of anaerobic-anoxic device 3, realizes the secondary aeration through the aeration pipeline.
Said BAF 10 is after the operation of 15d, and middle water layer concentration of suspension significantly increases and take place the release of phosphorus, and BAF 10 is carried out back flushing; Gas, water backwashing strength are 5L/ (m2.s); Time is respectively gas towards 4min, and air water is towards 3min, and water is towards 4min.
Said BAF 10 back flushinges water inlet is the water outlet of clean water basin 11; Contain water shoot 22 dischargings of the back flushing draining of a large amount of pollutents through water layer in the middle of being arranged on; Not disturbance BAF 10 top clear water layers during recoil; The back flushing energy consumption is low, and the BAF work period prolongs.
Be to guarantee stable, the efficient operation of combined system, the application of the invention property two gordian techniquies in the AA-BAF system: denitrification dephosphorizing reactor and deoxidation BAF.The AA unit is denitrification dephosphorization type reactor drum, and is not nitrated, and nitric nitrogen has been alleviated the denitrification come-up of mud in the second pond to the influence of anaerobic phosphorus release in the removal returned sluge, guarantees the steady running of second pond; Deoxidation BAF is nitrated/reactor drum, and the filtrate middle part is provided with two phase separator, and the bottom is nitrated section, is dominant bacteria this autotrophic type nitrifier, accomplishes the nitrated of ammonia nitrogen, holds back suspended substance simultaneously; Deoxidation BAF disturbs nitrated deoxidation fillter section for no gas in top, efficiently holds back the suspended substance that the microbial film that comes off etc. forms, and guarantees that water outlet SS reaches one-level A standard; The setting of two phase separator among the BAF reduces the DO in the nitrification liquid backflow.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and is convenient to these those skilled in the art and can understands and use the present invention, can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, and needn't pass through performing creative labour.Therefore, those skilled in the art should be within protection scope of the present invention to the simple modifications that the present invention makes according to announcement of the present invention.
Claims (10)
1. the A/A-O device of a double sludge denitrification dephosphorization denitrogenation is characterized in that: mainly be made up of preliminary sedimentation tank, anaerobic-anoxic device, second pond, intermediate pool, BAF and clean water basin; Said preliminary sedimentation tank is connected with the anaerobic zone of anaerobic-anoxic device, and the degas zone of anaerobic-anoxic device is connected with second pond, and second pond is connected with the anaerobic zone of anaerobic-anoxic device through sludge pump; The water outlet of said second pond is connected to intermediate pool, and intermediate pool is connected with BAF, and said BAF is connected to clean water basin; Said clean water basin are connected with the oxygen-starved area of anaerobic-anoxic device; Said clean water basin are connected with BAF bottom water distributing area.
2. the A/A-O device of double sludge denitrification dephosphorization denitrogenation according to claim 1 is characterized in that: the packing layer of said BAF is provided with two phase separator, and two phase separator is connected with the degas zone of anaerobic-anoxic device through the aeration pipeline.
3. the A/A-O device of double sludge denitrification dephosphorization denitrogenation according to claim 1 is characterized in that: said second pond is provided with the mud discharging pipe; Said BAF bottom is provided with blow-off valve; Said clean water basin are provided with rising pipe.
4. the A/A-O device of double sludge denitrification dephosphorization denitrogenation according to claim 1 is characterized in that: the device of said double sludge denitrification dephosphorization denitrogenation also comprises gas blower, and gas blower is connected with BAF through the gentle flowmeter body of aeration pipeline.
5. the A/A-O device of double sludge denitrification dephosphorization denitrogenation according to claim 1 is characterized in that: said BAF is nitrated/reactor drum, and the filtrate bottom is nitrated section, and nitrated deoxidation fillter section is disturbed for no gas in top.
6. the A/A-O method of a double sludge denitrification dephosphorization denitrogenation, it is characterized in that: the concrete steps of this method are:
1) sewage gets into the anaerobic zone of anaerobic-anoxic device from preliminary sedimentation tank, and in the anaerobic zone releases phosphorus, muddy water mixed solution with the formula of seething the flow through anaerobic zone and the oxygen-starved area of anaerobic-anoxic device, carries out denitrification dephosphorization denitrification, and in degas zone, outgases under action of gravity;
2) muddy water mixed solution gets into second pond from above-mentioned degas zone, realizes mud-water separation, and the supernatant that contains ammonia nitrogen flows into intermediate pool, gets into the BAF bottom through HPP; Mud is discharged through delivery pipe;
3) the superiority bacteria spp nitrifier in the above-mentioned BAF is converted into nitric nitrogen with the ammonia nitrogen in the above-mentioned supernatant, and nitrification liquid gets into clean water basin after filtration and deoxidation, and treating water discharges through rising pipe;
4) the rich phosphorus sludge that does not contain nitrate salt in the second pond gets into the anaerobic zone of anaerobic-anoxic device in the above-mentioned steps 2 through sludge reflux pump; PolyP bacteria in the mud utilizes the low molecular weight volatile property organic acid in the sewage; Synthetic PHB accomplishes a large amount of releases of phosphorus, and it is high to release phosphorus speed; Large amount of organic is transformed rapidly in the sewage, accounts for the 70-80% of combination process in the removal of 4 couples of COD of anaerobic zone; The denitrification phosphorus-collecting bacterium accounts for the ratio of polyP bacteria near 80%;
5) mixing sludge in the step 4 gets into the oxygen-starved area from above-mentioned anaerobic zone; The deoxidation nitrification liquid of the clean water basin of BAF entering simultaneously gets into the oxygen-starved area through the nitrification liquid reflux pump; Denitrifying bacteria utilizes the remaining carbon source denitrification denitrogenation of polyP bacteria in the anaerobic zone, and the denitrification phosphorus-collecting bacterium is that electron acceptor(EA) is inhaled phosphorus with the nitrate nitrogen;
6) muddy water mixed solution in the step 5 flows into degas zone from the oxygen-starved area, accomplishes the removal of phosphoric residue and the stripping of nitrogen;
7) sewage gets into second pond from above-mentioned degas zone, realizes mud-water separation, and mud is discharged through delivery pipe, and supernatant flows into intermediate pool, gets into BAF through HPP, handles the back at BAF and discharges.
7. according to the A/A-O method of the said double sludge denitrification dephosphorization denitrogenation of claim 6, it is characterized in that: said this device specifically carries out sewage treatment process and has also added gas blower: gas blower through gas meter and aeration pipeline from the BAF bottom aeration.
8. according to the A/A-O method of the said double sludge denitrification dephosphorization denitrogenation of claim 7; It is characterized in that: the two phase separator that is arranged at the filtrate middle part of BAF is collected weary gas; In the degas zone of anaerobic-anoxic device, realize the secondary aeration through the aeration pipeline, accomplish stripping nitrogen.
9. the A/A-O method of said according to Claim 8 double sludge denitrification dephosphorization denitrogenation; It is characterized in that: said BAF is after the operation of 10-15d; Middle water layer concentration of suspension significantly increases or takes place the release of phosphorus; BAF is carried out back flushing, the suspended substance of water layer in the middle of absorbing.
10. according to the A/A-O method of the said double sludge denitrification dephosphorization denitrogenation of claim 9; It is characterized in that: said BAF back flushing water inlet is the water outlet of clean water basin; Contain the water shoot discharging of the back flushing draining of a large amount of pollutents through water layer in the middle of being arranged on; Not disturbance BAF top clear water layer during recoil shortens the recoil running time, prolongs the filter tank work period.
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