CN102583743B - 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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- 239000010802 sludge Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 33
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- 241000894006 Bacteria Species 0.000 claims abstract description 33
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- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 22
- 239000011574 phosphorus Substances 0.000 claims abstract description 22
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 38
- 239000007789 gas Substances 0.000 claims description 28
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- 239000007788 liquid Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229920000388 Polyphosphate Polymers 0.000 claims description 13
- 229920000037 Polyproline Polymers 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 239000001205 polyphosphate Substances 0.000 claims description 13
- 235000011176 polyphosphates Nutrition 0.000 claims description 13
- 238000010992 reflux Methods 0.000 claims description 12
- 229910019142 PO4 Inorganic materials 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 10
- 239000010452 phosphate Substances 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
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 8
- 239000006228 supernatant Substances 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- 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
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- 238000005276 aerator Methods 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 abstract description 9
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 241000108664 Nitrobacteria Species 0.000 abstract 1
- 238000007872 degassing Methods 0.000 abstract 1
- 238000011001 backwashing Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
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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 througha 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 separationof 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, what be specially adapted to sewage work carries that mark is transformed and advanced treatment of wastewater factory newly-built, is specifically related to a kind of A/A-O apparatus and method of the strengthened denitrification for sewage disposal.
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, needs to add a large amount of additional carbons in the biological carbon and phosphorous removal treating processes, and Sewage Plant does not adopt energy conservation 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 is also more remarkable.
PolyP bacteria, denitrifying bacteria and nitrifier coexistence in the AAO denitrification dephosphorization system, exist mud on age contradiction and the competition on the carbon source, so that polyP bacteria anaerobic phosphorus release efficient is not high, the nitrifier nitrification efficiency is low, aeration energy consumption is large, is difficult to obtain simultaneously in single biochemical system the good result of denitrogenation dephosphorizing; And denitrification easily occurs in the nitric nitrogen in the aerobic zone water outlet in second pond, make the mud floating, affects the normal operation of system.Because China town sewage C/N is generally lower, can be used for the VFA of anaerobic phosphorus release lower, the shortage of carbon source is so that the problem that originally exists in the AAO technique 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 processing sanitary sewage separately, back flushing is frequent, and filler easily stops up and the problem such as harden.
AAO-BAF integrates AAO and BAF advantage, and water resistant power portative power is strong, and is adaptable to temperature variation, by separating of polyP bacteria and nitrifier, can stablize the realization Denitrifying Phosphorus Removal 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 such as the BAF water outlet, so that 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 be polluted; Slackened the strainability of BAF owing to the interference of aeration, it is higher that the microbial film that comes off etc. is used water suspension SS.
How energy-saving and cost-reducing and effectively utilize the basis of former water carbon source to improve the Nitrogen/Phosphorus Removal of combined process system, realize simultaneously mud process decrement, become the great demand of present stage sewage treatment area.
Summary of the invention
The objective of the invention is for present AAO technological problems, in conjunction with energy-saving and cost-reducing, carbon source is effectively utilized and three gordian techniquies of mud decrement, a kind of waste disposal plant and method are proposed, make Denitrifying Phosphate Accumulating Organisms become the superiority bacteria spp of AAO unit by the technique adjustment, realize separating of polyP bacteria and nitrifier, separating of second pond precipitation 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 solution used in the present invention is as follows:
The device of a kind of A/A-O of double sludge denitrification dephosphorization denitrogenation mainly is comprised of preliminary sedimentation tank, anaerobic-anoxic device, second pond, intermediate pool, BAF and clean water basin; Described 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 by the anaerobic zone of sludge pump with the anaerobic-anoxic device; The water outlet of described second pond is connected to intermediate pool, and intermediate pool is connected with BAF, and described BAF is connected to clean water basin; Described clean water basin are connected with the oxygen-starved area of anaerobic-anoxic device; Described clean water basin are connected with BAF bottom water distributing area.
Preferably, the packing layer of described 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 by valve.
Preferably, described second pond is provided with delivery pipe; Described BAF bottom installation of relief valve; Described clean water basin are provided with rising pipe.
More preferably, the device of described double sludge denitrification dephosphorization denitrogenation also comprises gas blower, and gas blower is connected with BAF by the gentle flowmeter body of aeration pipeline.
More preferably, described BAF is nitrated/reactor, and the filtrate bottom is nitrated section, and top is for to disturb nitrated deoxidation fillter section without gas.
A kind of A/A-O method of double sludge denitrification dephosphorization denitrogenation, the concrete steps of the method are:
1) sewage enters the anaerobic zone of anaerobic-anoxic device from preliminary sedimentation tank, discharge phosphorus at anaerobic zone, muddy water mixed solution is under action of gravity, with tumble type flow through anaerobic zone and the oxygen-starved area of anaerobic-anoxic device, carry out denitrification dephosphorization denitrification and remove organism, and degassed in degas zone;
2) sewage enters second pond from above-mentioned degas zone, realizes mud-water separation, and the supernatant liquor that contains ammonia nitrogen flows into intermediate pool, enters the BAF bottom through high-pressure pump; Mud is discharged through delivery pipe;
3) the superiority bacteria spp nitrifier in the above-mentioned BAF is nitric nitrogen with the mineralized nitrogen in the above-mentioned supernatant liquor, and its hydraulic detention time is 0.5-1h, and gas-water ratio is 6-10, and nitrification liquid enters clean water basin after filtration and deoxidation, processes water and discharges through rising pipe;
4) rich phosphorous sludge that does not contain nitrate in the second pond enters 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%, hydraulic detention time is 1-2h, polyP bacteria in the mud utilizes the low molecular weight volatile organic acid (VFA) in the sewage, synthetic PHB finishes a large amount of releases of phosphorus, and phosphorus release rate is high; 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; Denitrifying Phosphate Accumulating Organisms accounts for the ratio of polyP bacteria near 80%;
5) mixing sludge in the step 4 enters the oxygen-starved area from above-mentioned anaerobic zone, establish whipping appts in the pond, the deoxidation nitrification liquid that the while BAF enters clean water basin enters the oxygen-starved area by the nitrification liquid reflux pump, dissolved oxygen concentration in the oxygen-starved area is very low, DO is less than 0.3mg/L, suppressed aerobic heterotrophic bacterium to the predation of carbon source, denitrifying bacteria utilizes the remaining carbon source denitrification denitrogenation of polyP bacteria in the anaerobic zone, Denitrifying Phosphate Accumulating Organisms is take nitrate nitrogen as electron acceptor(EA), take PHB as electron donor, denitrification dephosphorization occurs, and 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 occur, and Main Function is the removal of finishing stripping and the phosphoric residue of nitrogen, improve the sludge settling performance, the mixed solution sludge concentration is 2500-3000mg/L;
7) sewage enters second pond from above-mentioned degas zone, realizes mud-water separation, and mud is discharged through delivery pipe, and supernatant liquor flows into intermediate pool, enters BAF through high-pressure pump, discharges after BAF is processed.
Preferably, the two phase separator that is arranged at the filtrate middle part of BAF is collected weary gas, realizes the secondary aeration by the aeration pipeline in the degas zone of anaerobic-anoxic device, finishes the stripping to nitrogen, improves sludge settling property.
More preferably, described BAF is after the operation of 10-15d, and middle water layer concentration of suspension significantly increases and phosphate releasing occurs, 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/(m
2.s), the time is respectively gas and rushes 2-5min, and air water rushes 2-4min, and water rushes 3-6min.
More preferably, described BAF back flushing water inlet is the water outlet of clean water basin, contain the back flushing draining of a large amount of pollutents by the water shoot discharging of water layer in the middle of being arranged on, not disturbance BAF top clear water layer during recoil shortens the backflush operation 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 Denitrifying Phosphorus Removal 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, stable, suspended substance is removed in the advanced nitrogen dephosphorization.
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 anaerobic/anoxic process, and denitrogenation dephosphorizing power is strong;
The application of Denitrifying Phosphorus Removal Technology realizes the process decrement of the dual-purpose and mud of a carbon;
The AA unit is not nitrated, and nitric nitrogen has been alleviated floating or the disintegration of mud in the second pond to the impact 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 separating of filtering eliminating the disturbance of aeration to filtering, 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 discharged by the water shoot that is arranged on the middle water layer of BAF, not disturbance BAF top clear water layer during recoil, and the backwash operation time is short.
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; The 2-intake pump; 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-high-pressure pump; 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 described in further detail.
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 being 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 forms; Described anaerobic-anoxic device 3 is the AA device of AAO treatment process, described preliminary sedimentation tank 1 is connected with the anaerobic zone 4 of anaerobic-anoxic device 3 by intake pump 2, muddy water mixed solution under action of gravity, flow through oxygen-starved area 5 and the 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 is connected with the anaerobic zone 4 of anaerobic-anoxic device 3 by sludge pump 14, after mud enters second pond 7, pump is to the anaerobic zone circulation of anaerobic-anoxic device 3, described second pond 7 is provided with delivery pipe 24, and excess sludge is discharged from delivery pipe 24; The water outlet of described second pond 7 is connected to intermediate pool 8, and intermediate pool 8 is connected with BAF 10 by high-pressure pump 9, and described BAF 10 is connected to clean water basin 11, and clean water basin 11 are provided with rising pipe 12.
Described clean water basin 11 are connected with the oxygen-starved area 5 of anaerobic-anoxic device 3 by nitrification liquid reflux pump 13, so that the nitrification liquid that forms in the BAF is back to anaerobic-anoxic device 3 as electron acceptor(EA); Described clean water basin 11 are connected with valve by backwashing pump 20 and are connected with BAF 10 bottom water distributing areas, and clean water basin 11 interior water are back to BAF 10 as back-flushing; The packing layer of described BAF 10 is provided be used to the two phase separator 17 of collecting weary gas, and two phase separator 17 is connected with air pump by air valve 18 and is connected with the degas zone 6 of anaerobic-anoxic device 3; During use, the weary gas that two phase separator 17 in the BAF 10 is collected is realized the secondary aeration by aeration pipeline and aerator in the degas zone of anaerobic-anoxic device 3, finish the stripping to nitrogen, improve the sludge settling performance, reduce the biosystem aeration energy consumption; BAF 10 middle parts of upward flow form middle water layer without filtrate, not disturbance BAF 10 top clear water layers during back flushing, and the back-flushing draining is discharged from the water shoot 22 of BAF 10; Described BAF 10 bottom installation of relief valves 23.
Described BAF 10 is nitrated/reactor, and the filtrate bottom is nitrated section, is dominant bacteria this autotrophic type nitrifier, finishes the nitrated of ammonia nitrogen, holds back simultaneously suspended substance; Top is for to disturb nitrated deoxidation fillter section without gas, when efficiently holding back the suspended substance that the microbial film that comes off etc. forms, utilize remaining dissolved oxygen to finish the oxidation of residue ammonia nitrogen, thereby further reduce dissolved oxygen, guarantee that the water outlet SS of low DO concentration reaches one-level A emission standard.
The device of described double sludge denitrification dephosphorization denitrogenation also comprises gas blower 15, and gas blower 15 is connected with BAF 10 by the gentle flowmeter body 16 of aeration pipeline.
Utilize this device specifically to carry out the sanitary sewage disposal process as follows:
1) sewage enters the anaerobic zone 4 of anaerobic-anoxic device 3 from preliminary sedimentation tank 1, discharge phosphorus at anaerobic zone 4, muddy water mixed solution is under action of gravity, with tumble type flow through anaerobic zone 4 and the 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 enters second pond 7 from above-mentioned degas zone 6, realizes mud-water separation, and the supernatant liquor that contains ammonia nitrogen flows into intermediate pool 8, enters BAF 10 bottoms through high-pressure pump 9; Mud is discharged through delivery pipe 24, and second pond 7 is stable, and mud floating or disintegration do not occur;
3) the superiority bacteria spp nitrifier in the above-mentioned BAF is nitric nitrogen with mineralized nitrogen, and its hydraulic detention time is 1h, and gas-water ratio is 6, and nitrification liquid enters clean water basin 11 after filtration and deoxidation, processes water through rising pipe 12 dischargings;
4) rich phosphorous sludge that does not contain nitrate in the second pond 7 enters the anaerobic zone 4 of anaerobic-anoxic device 3 in the above-mentioned steps 2 through sludge reflux pump 14, establish whipping appts in the pond, return sludge ratio is 100%, hydraulic detention time is 2h, polyP bacteria in the mud utilizes the low molecular weight volatile organic acid (VFA) in the sewage, synthetic PHB finishes a large amount of releases of phosphorus, and phosphorus release rate is high; 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; Denitrifying Phosphate Accumulating Organisms accounts for the ratio of polyP bacteria near 80%;
5) mixing sludge in the step 4 enters oxygen-starved area 5 from above-mentioned anaerobic zone 4, establish whipping appts in the pond, the deoxidation nitrification liquid that while BAF 10 enters clean water basin 11 enters oxygen-starved area 5 by nitrification liquid reflux pump 13, dissolved oxygen concentration in the oxygen-starved area 5 is very low, less than 0.3mg/L, suppressed aerobic heterotrophic bacterium to the predation of carbon source, denitrifying bacteria utilizes the remaining carbon source denitrification denitrogenation of polyP bacteria in the anaerobic zone, Denitrifying Phosphate Accumulating Organisms is take nitrate nitrogen as electron acceptor(EA), take PHB as electron donor, denitrification dephosphorization occurs, and 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 only are 1h, and the oxidation of ammonia nitrogen does not occur, and Main Function is to finish 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 enters second pond 7 from above-mentioned degas zone 6, realizes mud-water separation, and mud is discharged through delivery pipe 24, and supernatant liquor flows into intermediate pool 8, enters BAF 10 through high-pressure pump 9, flows into clean water basin after BAF 10 is processed.
Described this device specifically carries out sewage treatment process and has also added gas blower 15: gas blower 15 by 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, by the degas zone 6 interior realization secondary aerations of aeration pipeline at anaerobic-anoxic device 3.
Described BAF 10 is after the operation of 15d, and middle water layer concentration of suspension significantly increases and phosphate releasing occurs, and BAF 10 is carried out back flushing, and gas, water backwashing strength are 5L/(m
2.s), the time is respectively gas and rushes 4min, and air water rushes 3min, and water rushes 4min.
Described BAF 10 back flushinges water inlet is the water outlet of clean water basin 11, contain the back flushing draining of a large amount of pollutents by water shoot 22 dischargings of 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 two gordian techniquies in the AA-BAF system: denitrification dephosphorizing reactor and deoxidation BAF.The AA unit is denitrification dephosphorization type reactor, and is not nitrated, and nitric nitrogen has been alleviated the denitrification floating of mud in the second pond to the impact of anaerobic phosphorus release in the removal returned sluge, guarantees the steady running of second pond; Deoxidation BAF is nitrated/reactor, and the filtrate middle part arranges two phase separator, and the bottom is nitrated section, is dominant bacteria this autotrophic type nitrifier, finishes the nitrated of ammonia nitrogen, holds back simultaneously suspended substance; Deoxidation BAF top is for to disturb nitrated deoxidation fillter section without gas, 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 be in conjunction with concrete preferred implementation to the further description that the present invention does, being convenient to these those skilled in the art can understand and apply the invention, and can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, can also make without departing from the inventive concept of the premise 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 (7)
1. the A/A-O device of a double sludge denitrification dephosphorization denitrogenation is characterized in that: mainly be comprised of preliminary sedimentation tank, anaerobic-anoxic device, second pond, intermediate pool, BAF and clean water basin; Described 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 by the anaerobic zone of sludge pump with the anaerobic-anoxic device; The water outlet of described second pond is connected to intermediate pool, and intermediate pool is connected with BAF, and described BAF is connected to clean water basin; Described clean water basin are connected with the oxygen-starved area of anaerobic-anoxic device; Described clean water basin are connected with BAF bottom water distributing area; The packing layer of described BAF is provided with two phase separator, and the weary gas that two phase separator is collected is connected with the degas zone of aerator with the anaerobic-anoxic device by the aeration pipeline.
2. the A/A-O device of double sludge denitrification dephosphorization denitrogenation according to claim 1, it is characterized in that: described second pond is provided with the mud discharging pipe; Described BAF bottom installation of relief valve; Described clean water basin are provided with rising pipe.
3. the A/A-O device of double sludge denitrification dephosphorization denitrogenation according to claim 1, it is characterized in that: the device of described double sludge denitrification dephosphorization denitrogenation also comprises gas blower, gas blower is connected with BAF by the gentle flowmeter body of aeration pipeline.
4. the A/A-O device of double sludge denitrification dephosphorization denitrogenation according to claim 1, it is characterized in that: described BAF is nitrated/reactor, the filtrate middle part arranges two phase separator, and the bottom is nitrated section, and top is for to disturb nitrated deoxidation fillter section without gas.
5. the A/A-O method of a double sludge denitrification dephosphorization denitrogenation, it is characterized in that: the concrete steps of the method are:
1) sewage enters the anaerobic zone of anaerobic-anoxic device from preliminary sedimentation tank, discharges phosphorus at anaerobic zone, and muddy water mixed solution with tumble type flow through anaerobic zone and the oxygen-starved area of anaerobic-anoxic device, carries out denitrification dephosphorization denitrification under action of gravity, and degassed in degas zone;
2) muddy water mixed solution enters second pond from above-mentioned degas zone, realizes mud-water separation, and the supernatant liquor that contains ammonia nitrogen flows into intermediate pool, enters the BAF bottom through high-pressure pump; Mud is discharged through delivery pipe;
3) the superiority bacteria spp nitrifier in the above-mentioned BAF is nitric nitrogen with the mineralized nitrogen in the above-mentioned supernatant liquor, and nitrification liquid enters clean water basin after filtration and deoxidation, processes water and discharges through rising pipe;
4) rich phosphorous sludge that does not contain nitrate in the second pond enters 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 organic acid in the sewage, synthetic PHB finishes a large amount of releases of phosphorus, and phosphorus release rate is high; Large amount of organic is transformed rapidly in the sewage, the removal of COD is accounted for the 70-80% of combination process at anaerobic zone (4); Denitrifying Phosphate Accumulating Organisms accounts for the ratio of polyP bacteria near 80%;
5) mixing sludge in the step 4 enters the oxygen-starved area from above-mentioned anaerobic zone, the deoxidation nitrification liquid that the while BAF enters clean water basin enters the oxygen-starved area by the nitrification liquid reflux pump, denitrifying bacteria utilizes the remaining carbon source denitrification denitrogenation of polyP bacteria in the anaerobic zone, and Denitrifying Phosphate Accumulating Organisms is inhaled phosphorus take nitrate nitrogen as electron acceptor(EA);
6) muddy water mixed solution in the step 5 flows into degas zone from the oxygen-starved area, finishes the removal of phosphoric residue and the stripping of nitrogen;
7) sewage enters second pond from above-mentioned degas zone, realizes mud-water separation, and mud is discharged through delivery pipe, and supernatant liquor flows into intermediate pool, enters BAF through high-pressure pump, discharges after BAF is processed; Wherein, carry out sewage treatment process and also added gas blower: gas blower by gas meter and aeration pipeline from BAF bottom aeration;
The two phase separator that is arranged at the filtrate middle part of BAF is collected weary gas, realizes the secondary aeration by the aeration pipeline in the degas zone of anaerobic-anoxic device, finishes the stripping to nitrogen.
6. the A/A-O method of described double sludge denitrification dephosphorization denitrogenation according to claim 5, it is characterized in that: described BAF is after the operation of 10-15d, middle water layer concentration of suspension significantly increases or phosphate releasing occurs, BAF is carried out back flushing, the suspended substance of water layer in the middle of absorbing.
7. the A/A-O method of described double sludge denitrification dephosphorization denitrogenation according to claim 6, it is characterized in that: described BAF back flushing water inlet is the water outlet of clean water basin, contain the back flushing draining of a large amount of pollutents by the water shoot discharging of water layer in the middle of being arranged on, not disturbance BAF top clear water layer during recoil, shorten the backflush operation time, prolong the filter tank work period.
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