CN104355499A - Side flow denitrification tank and side flow denitrification method - Google Patents

Side flow denitrification tank and side flow denitrification method Download PDF

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Publication number
CN104355499A
CN104355499A CN201410645936.XA CN201410645936A CN104355499A CN 104355499 A CN104355499 A CN 104355499A CN 201410645936 A CN201410645936 A CN 201410645936A CN 104355499 A CN104355499 A CN 104355499A
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pond
pipe
mud
supernatant liquor
technique
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CN201410645936.XA
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Chinese (zh)
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CN104355499B (en
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周丽颖
李星文
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浦华环保有限公司
紫光环保有限公司
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • C02F3/305Nitrification and denitrification treatment characterised by the denitrification
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • C02F3/2866Particular arrangements for anaerobic reactors
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

The invention relates to a side flow denitrification technique which can be used in combination with an AAO (anaerobic-anoxic-oxic) technique, a CAST (cyclic activated sludge technology) technique, an oxidation ditch technique with a front end anaerobic region and any other activated sludge treatment technique. When the technique is used in combination with the AAO technique, a sludge discharge pipe of a secondary sedimentation tank is connected with a side flow denitrification tank, the upper part of the side flow denitrification tank is connected with a supernate pipe, and the supernate pipe is connected with an anoxic zone and the secondary sedimentation tank. When the technique is used in combination with the oxidation ditch technique with a front end anaerobic region, a sludge discharge pipe of a secondary sedimentation tank is connected with a side flow denitrification tank, and the upper part is connected with a supernate pipe which is connected with an oxidation ditch and the secondary sedimentation tank. When the technique is used in combination with the CAST technique, a sludge discharge pipe of a main reaction region is connected with a side flow denitrification tank, and a supernate pipe is connected with the main reaction region. The side flow denitrification tank provided by the invention enhances the sludge concentration, and the sludge is subjected to endogenous respiration denitrification, thereby greatly lowering the nitrate amount, reducing the influence of the sludge on the anaerobic section of the biochemical reaction tank or the phosphorus release of the biological selection region of the CAST technique, and enhancing the dephosphorization effect of the system.

Description

A kind of effluent denitrification pond and effluent denitrification process
Technical field
The present invention relates to a kind of effluent denitrification process, belong to technical field of sewage.
Background technology
In existing sewage disposal technology, conventional process for removing nitrogen and phosphor from sewage is AAO technique, it is the simultaneous phosphorus and nitrogen removal technique developed on anaerobism one anoxic process the seventies, and its biological reaction tank is made up of anaerobism, anoxic and aerobic three sections, and its typical process flow is shown in Fig. 1.This is a kind of Prepositive denitrification type technique of pulling flow type, be characterized in anaerobism, anoxic, aerobic three sections of definite functions, the division is clearly demarcated, can according to flow condition and water outlet requirement, creates and control the space-time ratio of three sections artificially and operating condition can reach higher denitrification percent as required.
Standard biologic denitrification dephosphorization technique is the arrangement form of anaerobism (A1)/anoxic (A2)/aerobic (O).This is arranged in theory based on a kind of like this understanding, that is: poly-phosphorus microorganism effectively releases the whether abundant of phosphorus level, for improving the dephosphorization ability of system, there is extremely important meaning, anaerobic zone before poly-phosphorus microorganism can be made preferentially to obtain carbon source and fully be released phosphorus.But owing to ranking forefront in anaerobic zone, the nitrate in returned sluge can have a negative impact to anaerobic zone; Because oxygen-starved area is positioned in the middle part of system, denitrification divides to mix in carbon source and occupy minus advantage, thus have impact on the denitrification effect of system; In order to reduce the nitrate in returned sluge, must improve mixed-liquor return amount, the raising of quantity of reflux certainly will will increase power consumption.
The technique of good denitrification dephosphorization effect also has with oxidation ditch process and various SBR technique.
Oxidation ditch is a kind of modified version of activated sludge process, has dephosphorization denitrogenation function, and its aeration tank is closed irrigation canals and ditches, and the mixed solution of waste water and active sludge constantly circulates wherein, and therefore oxidation ditch has another name called " continuous circulation aeration ".Be provided with in ditch and turn brush or plate-spinning, there is nitrated, denitrifying characteristic, before oxidation ditch, increase an anaerobic selection pond, just constitute biological carbon and phosphorous removal system.First sewage and returned sluge enter anaerobic selection pond, about 1 hour residence time, complete the release of phosphorus, and improve the settleability of mud in anaerobic pond, and then mixed solution enters oxidation ditch and carries out nitrated, denitrification, realizes denitrogenation dephosphorizing.
SBR method collection aeration, be deposited in a pond, do not need second pond.Within the system, reaction tank is full of sewage in a certain time interval, runs with delayed time system, after mixed solution precipitates one period of predetermined time after process, from pond, gets rid of supernatant liquor.Typical SBR system is divided into: water-filling, reaction, precipitation, draining and idle 5 stages, SBR method passes through oxygenation, the consecutive variations of anoxic and anaerobic condition can meet the growth of multiple-microorganism, hocket different bioprocesss, thus the removal of realization hydrolysis, organic carbon and denitrogenation dephosphorizing process, reach and reduce BOD 5, COD, nitrated, the object of denitrogenation and dephosphorization.The CAST method system of improvement is provided with biological selecting area, constantly refluxed to biological selecting area by main reaction region, mud absorbs the easy degraded part in processable matrix, and impels floc microbe to grow, because biological selecting area should adopt anaerobism operation scheme, thus improve biological phosphor-removing effect.
Summary of the invention
For the weak point that this area exists, the object of the invention is to propose a kind of effluent denitrification process.
The technical scheme realizing above-mentioned purpose of the present invention is:
A kind of effluent denitrification pond, is connected by the second pond or CAST technique main reaction region entering mud pipe and biochemical treatment system,
Be connected with supernatant liquor pipe above described effluent denitrification pond, described supernatant liquor is delivered to the main reaction region of oxygen-starved area or oxidation ditch origin or beginning and second pond or CAST process system;
Be connected with supernatant liquor pipe above described effluent denitrification pond, the oxygen-starved area of described supernatant liquor pipe and AAO technique or oxidation ditch origin or beginning and second pond are connected; Described enter in the middle of the import of mud pipe is positioned at bottom effluent denitrification pond, described effluent denitrification pond is provided with multiple swash plate near the side entering the import of mud pipe, swash plate spacing is 50-60mm, away from entering mud pipe import side, supernatant liquor water leg is being set, described supernatant liquor water leg connects supernatant liquor pump well, and described supernatant liquor pump well is connected with biochemical treatment system by supernatant liquor pipe;
Described biochemical treatment system is that AAO technology processing system, CAST technology processing system, front end are with the one in the oxidation ditch process treatment system of anaerobic zone.
As one embodiment of the present invention, described biochemical treatment system is AAO technology processing system or the front end oxidation ditch process treatment system with anaerobic zone, pass through to be connected into mud pipe with bottom second pond bottom described effluent denitrification pond, described supernatant liquor pump well is connected by supernatant liquor pipe and oxygen-starved area or oxidation ditch origin or beginning and second pond;
As another embodiment of the present invention, described biochemical treatment system is CAST technology processing system, and pass through to be connected into mud pipe with bottom main reaction region bottom described effluent denitrification pond, described supernatant liquor pump well is connected with main reaction region by supernatant liquor pipe.
Preferably, the angle of described swash plate and horizontal plane is 50-60 °, the long 0.8-1.2 rice of swash plate, 1.5-3 rice at the bottom of distance pond bottom swash plate.
Wherein, suction pipe is had bottom described effluent denitrification pond, described suction pipe is perforation suction pipe, described suction pipe is 4-6 root, suction pipe is divided into two groups, be connected with excess sludge sludge out pipe and mud return line respectively, described mud return line is connected with the pipeline of the biological selecting area entering anaerobic zone or CAST technique; The pipeline of described mud return line 26 and excess sludge sludge out pipe is provided with pump and valve; Described pump is dry-type centrifugal pump.
Enter sewage in effluent denitrification pond in the process upwards risen, macrobead mud is precipitated to downwards at the bottom of pond gradually along swash plate, and the bottom mud extraction concentration in final effluent denitrification pond is 18 ~ 20g/L.After avoiding submersible pump sucking sludge for some time, the concentration of sucking sludge becomes inhales, and occurs funneling effect, and at the bottom of pond, adopt perforated pipe to inhale mud, exterior arrangement dry pump, to ensure the even concentration of sucking sludge.For unnecessary excess sludge, adopt residual sludge pump to drain into sludge treating system and process.
A kind of effluent denitrification process, use the equipment that the present invention proposes, mud bottom second pond or CAST technique main reaction region is entered bottom effluent denitrification pond, mud is entered from body side, pond, through the swash plate of middle and upper part, pond, at the bottom of particles settling in mud to pond, supernatant liquor is collected by top water leg and is delivered to oxygen-starved area (or oxidation ditch origin or beginning) and the second pond of AAO technique; Or supernatant liquor drains into the main reaction region of CAST process system.
Adopt effluent denitrification pond, decrease the sludge quantity entering biochemistry pool, but significantly improve due to sludge concentration, effective mud total amount does not reduce.In effluent denitrification pond, the endogenous respiration effect of high concentration sludge enhances microorganism denitrifying capacity, and the mud nitrate going out stream in pond significantly reduces, and nitric nitrogen can be controlled in 2mg/L to 5mg/L.
Wherein, the settling time of mud in effluent denitrification pond entered bottom effluent denitrification pond is 1-2 hour, and then supernatant liquor is collected by top water leg and is delivered to the oxygen-starved area (or oxidation ditch origin or beginning) of AAO technique and the main reaction region of second pond or CAST process system;
The mud of sedimentation flows into the biological selecting area of anaerobic zone or CAST technique again, and the ratio of flow and flooding quantity that mud enters anaerobic zone is 0.3-0.6:1, and the ratio of flow and flooding quantity that mud enters CAST technique biological selecting area is 0.1-0.2:1.
If the denitrification effect of system requirements the best, also suitable carbon source can will be added in supernatant liquor.Be specially: before the supernatant liquor of discharging from effluent denitrification pond is delivered to oxygen-starved area, add carbon source, carbon source dosage can according to the nitrate of required removal, by 3 ~ 5 times of calculating.
Wherein, described carbon source is methyl alcohol or acetate.Described acetate can be sodium acetate or potassium acetate.
Or when water outlet total nitrogen is better (total nitrogen is less than 10mg/L), the supernatant liquor of discharging from effluent denitrification pond is delivered to second pond, and the rising pipe connected through second pond directly discharges.The water yield entering biochemical reaction tank can be reduced like this, increase the actual residence time.
Beneficial effect of the present invention is:
1, effluent denitrification pond improves sludge concentration, and mud, through endogenous respiration denitrification, greatly reduces nitrate amount, decreases mud releases phosphorus impact on biochemical reaction tank anaerobism section, improve the phosphor-removing effect of system.
2, mud to the sludge quantity of the main technique in AAO pond that goes out to flow in effluent denitrification pond is down to 30-60%, and the sludge quantity to CAST technique biological selecting area is down to 10-20%.The minimizing of entering mud amount decreases the dilution to biochemistry pool water-inlet carbon source.Strengthen the utilization of biochemical reaction to carbon source.
3, the mud discharge owing to entering biochemical reaction tank after the process of effluent denitrification pond is less, therefore correspondingly extends the residence time entering biochemical reaction tank, thus improves the denitrogenation dephosphorizing ability of system.
4, the anaerobic condition enhanced also inhibits hyphomycetic growth, improves the precipitated form of mud.Excess sludge concentration after effluent denitrification precipitation significantly improves, and strengthens processing power and the processing efficiency of follow-up sludge treating system.
Accompanying drawing explanation
Fig. 1 is anaerobic-anoxic-aerobic process schema in prior art.
Fig. 2 is the schema that effluent denitrification process that the present invention proposes combines with AAO technique.
Fig. 3 is the schema that effluent denitrification process that the present invention proposes combines with oxidation ditch process
Fig. 4 is the schema that effluent denitrification process that the present invention proposes combines with CAST technique
Fig. 5 is effluent denitrification pond vertical view.
In figure, 1 is water inlet pipe, 2 is anaerobic zones, 3 is oxygen-starved areas, 4 is aerobic zones, 5 is mixed-liquor return pipes, 6 is second ponds, 7 is external reflux sludge pipes, 8 is excess sludge vent pipes, 9 is rising pipes, 10 is into mud pipe, 11 is pond bodies, 12 is swash plates, 13 is supernatant liquor water legs, 14 is supernatant liquor braiding channels, 15 is swash plate edge support, 16 is perforation suction pipes, 17 is residual sludge pump, 18 is residual sludge pump holes, 19 is excess sludge sludge out pipe, 20 is valves, 21 is supernatant liquor pump wells, 22 is supernatant liquor rising pipes, 23 is supernatant liquid pumps, 24 is sludge reflux pumps, 25 is sludge reflux pump holes, 26 is mud return lines, 27 is effluent denitrification ponds, 28 is supernatant liquor pipes, 29 is oxidation ditches, 30 is biological selecting areas, 31 is CAST technique main reaction region.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1: effluent denitrification pond combines with AAO technique
The equipment that effluent denitrification pond combines with AAO technique, see Fig. 2 and Fig. 5, comprise the reaction tank lattice as anaerobic zone 2, oxygen-starved area 3, aerobic zone 4 and second pond 6, anaerobic zone 2, oxygen-starved area 3, aerobic zone 4 are connected by pipeline successively with second pond 6, and aerobic zone 4 is connected by mixed-liquor return pipe 5 with oxygen-starved area 3.
Pass through bottom second pond 6 to be connected in the middle of bottom effluent denitrification pond 27 into mud pipe 10, effluent denitrification pond is provided with swash plate 12 near the side entering the import of mud pipe, swash plate 12 swash plate edge support 15 supports, and swash plate edge support 15 is fixed on the inwall of pond body 11.The angle of swash plate and horizontal plane is 50-60 °, and swash plate is long 1 meter, bottom swash plate at the bottom of pond 2 meters.
Be connected with supernatant liquor pipe 28 above effluent denitrification pond 27, supernatant liquor pipe 28 is connected with oxygen-starved area and second pond, supernatant liquor pipe 28 pipeline is arranged valve and enters oxygen-starved area or second pond to control supernatant liquor.
Arranging supernatant liquor water leg 13 (top in pond) away from entering mud pipe import side, supernatant liquor water leg 13 connects supernatant liquor pump well 21, and supernatant liquor pump well 21 is connected with oxygen-starved area 3 by supernatant liquor pipe 28, supernatant liquid pump 23;
Four suction pipes 16 are positioned at bottom effluent denitrification pond, are connected respectively with excess sludge sludge out pipe 19 and mud return line 26, and described mud return line 26 is connected with anaerobic zone; The pipeline of mud return line 26 is provided with return sludge pump 24 and valve; Described return sludge pump 24 is dry-type centrifugal pump, is positioned at return sludge pump hole 25.The residual sludge pump 17 that the pipeline of excess sludge sludge out pipe 19 is arranged also is dry-type centrifugal pump.Suction pipe 16 is perforation suction pipe, and diameter 200mm, whole root canal wall has diameter 20mm hole, in bottom lateral sides, is 45 ° with vertical direction angle.
Embodiment 2: effluent denitrification sewage water treatment method combines with AAO technique
Flooding velocity is 40000m 3/ day, influent quality is:
BOD5≤160mg/L;CODcr≤300mg/L;SS≤180mg/L;TN≤45mg/L;NH 3-N≤35mg/L;TP≤4mg/L。
Use the effluent denitrification pond of embodiment 1, pending sewage disposal is according to AAO biochemical reaction technique, be introduced into anaerobic zone 2, enter oxygen-starved area, aerobic zone and second pond in turn to process, second pond mud extraction effluent enters sludge denitrification pond, the residence time is 1 hour, the nitrate concentration entering effluent denitrification pond is 15mg/L, the sludge concentration entered is 8000mg/L (water ratio is 99.2%), the sludge concentration flowed out from sludge denitrification pond is 18000mg/L, and nitrate concentration is 3mg/L.The anaerobic zone 2 of AAO reaction tank is flowed into again through the mud of endogenous respiration anti-nitration reaction, the ratio of flow and flooding quantity that mud enters the anaerobic zone 2 of AAO reaction tank is 0.5:1, improve the sludge concentration entering anaerobism section, decrease the impact of nitrate on anaerobic phosphorus release.Remaining mud is discharged via excess sludge pipe 8.
Supernatant liquor is collected by the water leg above effluent denitrification pond, is gathered into supernatant liquor braiding channel 14, is delivered to oxygen-starved area.
When water outlet total nitrogen is less than 10mg/L, the supernatant liquor of discharging from effluent denitrification pond is delivered to second pond, and the rising pipe connected through second pond directly discharges.
Final outflow water water quality is:
BOD 5≤8mg/L;CODcr≤45mg/L;SS≤10mg/L;TN≤10mg/L;NH 3-N≤1mg/L;TP≤0.5mg/L。
Water outlet reaches country's " urban wastewater treatment firm pollutant emission standard " one-level A standard.Embodiment 3: effluent denitrification sewage water treatment method combines with oxidation ditch process
Flooding velocity is 30000m 3/ day, influent quality is:
BOD5≤180mg/L;CODcr≤330mg/L;SS≤190mg/L;TN≤40mg/L;NH 3-N≤30mg/L;TP≤3mg/L。
See Fig. 3, use the effluent denitrification pond of embodiment 1, pending sewage disposal is introduced into anaerobic zone 2, enter oxidation ditch 29 again and second pond processes, second pond mud extraction effluent enters sludge denitrification pond, and the residence time is 1.5 hours, the nitrate concentration entering effluent denitrification pond is 15mg/L, the sludge concentration entered is 8500mg/L, and the sludge concentration flowed out from sludge denitrification pond is 17000mg/L, and nitrate concentration is 2mg/L.Mud through endogenous respiration anti-nitration reaction flows into anaerobic zone 2 again, and it is 0.6:1 that mud enters the flow of anaerobic zone 2 with the ratio of flooding quantity, improves the sludge concentration entering anaerobism section, decreases the impact of nitrate on anaerobic phosphorus release.Remaining mud is discharged via excess sludge pipe 8.
Supernatant liquor is collected by the water leg above effluent denitrification pond, is gathered into supernatant liquor braiding channel 14, is delivered to second pond 6.Final outflow water water quality is:
BOD 5≤6mg/L;CODcr≤40mg/L;SS≤9mg/L;TN≤10mg/L;NH 3-N≤1mg/L;TP≤0.5mg/L。
Water outlet reaches country's " urban wastewater treatment firm pollutant emission standard " one-level A standard.
Embodiment 4: effluent denitrification sewage water treatment method combines with CAST technique
Flooding velocity is 20000m 3/ day, influent quality is:
BOD5≤200mg/L;CODcr≤350mg/L;SS≤180mg/L;TN≤45mg/L;NH 3-N≤36mg/L;TP≤3mg/L。
See Fig. 4, pending sewage disposal is according to CAST biochemical reaction technique, be introduced into biological selecting area 30, enter CAST main reaction region 31 in turn to process, main reaction region mud extraction effluent enters sludge denitrification pond, and the residence time is 1.2 hours, the nitrate concentration entering effluent denitrification pond is 17mg/L, the sludge concentration entered is 9000mg/L, and the sludge concentration flowed out from sludge denitrification pond is 19000mg/L, and nitrate concentration is 1mg/L.Mud through endogenous respiration anti-nitration reaction flows into biological selecting area 30 again, the ratio of flow and flooding quantity that mud enters the biological selecting area 30 of CAST technique is 0.1:1, improve the sludge concentration entering biological selecting area, decrease the impact of nitrate on anaerobic phosphorus release.
Supernatant liquor is collected by the water leg above effluent denitrification pond, is gathered into supernatant liquor braiding channel 14, is delivered to CAST main reaction region 31.And add carbon source acetic acid 15mg/L.
Final outflow water water quality is:
BOD 5≤7mg/L;CODcr≤50mg/L;SS≤10mg/L;TN≤10mg/L;NH 3-N≤2mg/L;TP≤0.5mg/L。
Water outlet reaches country's " urban wastewater treatment firm pollutant emission standard " one-level A standard.

Claims (9)

1. an effluent denitrification pond, is characterized in that, is connected by the second pond or CAST technique main reaction region entering mud pipe and biochemical treatment system,
Be connected with supernatant liquor pipe above described effluent denitrification pond, described supernatant liquor is delivered to the main reaction region of oxygen-starved area or oxidation ditch origin or beginning and second pond or CAST process system;
Described enter in the middle of the import of mud pipe is positioned at bottom effluent denitrification pond, described effluent denitrification pond is provided with multiple swash plate near the side entering the import of mud pipe, swash plate spacing is 50-60mm, away from entering mud pipe import side, supernatant liquor water leg is being set, described supernatant liquor water leg connects supernatant liquor pump well, and described supernatant liquor pump well is connected with biochemical treatment system by supernatant liquor pipe;
Described biochemical treatment system is that AAO technology processing system, CAST technology processing system, front end are with the one in the oxidation ditch process treatment system of anaerobic zone.
2. effluent denitrification pond according to claim 1, it is characterized in that, described biochemical treatment system is AAO technology processing system or the front end oxidation ditch process treatment system with anaerobic zone, pass through to be connected into mud pipe with bottom second pond bottom described effluent denitrification pond, described supernatant liquor pump well is connected with oxygen-starved area or oxidation ditch origin or beginning by supernatant liquor pipe, and is connected with second pond.
3. effluent denitrification pond according to claim 1, it is characterized in that, described biochemical treatment system is CAST technology processing system, and pass through to be connected into mud pipe with bottom main reaction region bottom described effluent denitrification pond, described supernatant liquor pump well is connected with main reaction region by supernatant liquor pipe.
4. effluent denitrification pond according to claim 1, is characterized in that, the angle of described swash plate and horizontal plane is 50-60 °, the long 0.8-1.2 rice of swash plate, 1.5-3 rice at the bottom of distance pond bottom swash plate.
5. according to the arbitrary described effluent denitrification pond of claim 1-4, it is characterized in that, suction pipe is provided with bottom described effluent denitrification pond, described suction pipe is perforation suction pipe, described suction pipe is 4-6 root, suction pipe is divided into two groups, is connected respectively with excess sludge sludge out pipe and mud return line, and described mud return line is connected with the pipeline of the biological selecting area entering anaerobic zone or CAST technique; The pipeline of described mud return line and excess sludge sludge out pipe is provided with pump and valve; Described pump is dry-type centrifugal pump.
6. an effluent denitrification process, it is characterized in that, use the arbitrary described equipment of claim 1-5, mud bottom second pond or CAST technique main reaction region enters bottom effluent denitrification pond, mud is entered from body side, pond, through the swash plate of middle and upper part, pond, at the bottom of the particles settling in mud to pond, supernatant liquor is collected by top water leg and is delivered to the oxygen-starved area of AAO technique or oxidation ditch origin or beginning and second pond; Or supernatant liquor drains into the main reaction region of CAST process system.
7. method according to claim 6, it is characterized in that, the settling time of mud in effluent denitrification pond entered bottom effluent denitrification pond is 1-2 hour, and then supernatant liquor is collected by top water leg and is delivered to the main reaction region of oxygen-starved area or oxidation ditch origin or beginning and second pond or CAST process system;
The mud of sedimentation flows into the biological selecting area of anaerobic zone or CAST technique again, and the ratio of flow and flooding quantity that mud enters anaerobic zone is 0.3-0.6:1, and the ratio of flow and flooding quantity that mud enters CAST technique biological selecting area is 0.1-0.2:1.
8. the method according to claim 6 or 7, is characterized in that, from effluent denitrification pond discharge supernatant liquor be delivered to biochemical reaction zone before, can carbon source be added, carbon source dosage according to the nitrate of required removal, by 3 ~ 5 times of inputs; Described carbon source is methyl alcohol or acetate.
9. method according to claim 6, is characterized in that, when water outlet total nitrogen is less than 10mg/L, the supernatant liquor of discharging from effluent denitrification pond also directly can be delivered to second pond, and the rising pipe connected through second pond directly discharges.
CN201410645936.XA 2014-11-12 2014-11-12 A kind of effluent denitrification process CN104355499B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5942108A (en) * 1996-07-10 1999-08-24 Aqua-Aerobic Systems, Inc. Multi-phase dual cycle influent process
CN1609016A (en) * 2004-11-19 2005-04-27 宋乾武 Nitrogen and phosphorus removing process
CN101269878A (en) * 2008-05-06 2008-09-24 南京农业大学 Return sludge separation technique for improving dephosphorization removing nitric efficiency factor of wastewater treatment
CN102653434A (en) * 2012-04-16 2012-09-05 同济大学 Improved oxidation ditch technique of coupled return sludge preconcentration system
CN204224399U (en) * 2014-11-12 2015-03-25 浦华环保有限公司 A kind of effluent denitrification pond

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5942108A (en) * 1996-07-10 1999-08-24 Aqua-Aerobic Systems, Inc. Multi-phase dual cycle influent process
CN1609016A (en) * 2004-11-19 2005-04-27 宋乾武 Nitrogen and phosphorus removing process
CN101269878A (en) * 2008-05-06 2008-09-24 南京农业大学 Return sludge separation technique for improving dephosphorization removing nitric efficiency factor of wastewater treatment
CN102653434A (en) * 2012-04-16 2012-09-05 同济大学 Improved oxidation ditch technique of coupled return sludge preconcentration system
CN204224399U (en) * 2014-11-12 2015-03-25 浦华环保有限公司 A kind of effluent denitrification pond

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