CN104355499B - A kind of effluent denitrification process - Google Patents
A kind of effluent denitrification process Download PDFInfo
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- CN104355499B CN104355499B CN201410645936.XA CN201410645936A CN104355499B CN 104355499 B CN104355499 B CN 104355499B CN 201410645936 A CN201410645936 A CN 201410645936A CN 104355499 B CN104355499 B CN 104355499B
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- 238000000034 method Methods 0.000 title claims abstract description 92
- 230000008569 process Effects 0.000 title claims abstract description 46
- 239000010802 sludge Substances 0.000 claims abstract description 64
- 239000006228 supernatant Substances 0.000 claims abstract description 63
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 230000003647 oxidation Effects 0.000 claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 25
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 16
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005842 biochemical reaction Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 5
- 241000209094 Oryza Species 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 210000005056 cell body Anatomy 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 11
- 239000011574 phosphorus Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 8
- 230000007423 decrease Effects 0.000 abstract description 7
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract description 6
- 239000010865 sewage Substances 0.000 description 12
- 206010002660 Anoxia Diseases 0.000 description 4
- 241000976983 Anoxia Species 0.000 description 4
- 206010021143 Hypoxia Diseases 0.000 description 4
- 230000007953 anoxia Effects 0.000 description 4
- 238000009954 braiding Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000005273 aeration Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 238000006396 nitration reaction Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 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 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 210000004262 dental pulp cavity Anatomy 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The present invention relates to a kind of effluent denitrification process, it can be combined use with AAO technique, CAST technique and the oxidation ditch process isoreactivity sludge treatment technique with anaerobic zone, front end.When being combined use with AAO technique, sludge from final clarifier pipe is connected to effluent denitrification pond, and described effluent denitrification pond is connected above supernatant pipe, and supernatant pipe is connected with anoxic zone and second pond.When being combined use with the oxidation ditch process with anaerobic zone, sludge from final clarifier pipe is connected to effluent denitrification pond, is connected above supernatant pipe and is connected with oxidation ditch and second pond.With CAST technique in conjunction with time, main reaction region discharge pipeline is connected with effluent denitrification pond, and supernatant pipe is connected with main reaction region.The effluent denitrification pond that the present invention proposes improves sludge concentration, and mud, through endogenous respiration denitrification, is substantially reduced nitrate amount, decreases mud and biochemical reaction tank anaerobism section or CAST technique biological selecting area are released the impact of phosphorus, improve the phosphor-removing effect of system.
Description
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 pool is made up of anaerobism, anoxia and aerobic three sections, and its typical process flow is shown in Fig. 1.This is the Prepositive denitrification type technique of a kind of pulling flow type, it is characterized in anaerobism, anoxia, aerobic three sections of definite functions, the division is clearly demarcated, according to flow condition and water outlet requirement, can create artificially and space-time ratio and the operating condition of control three sections can reach the denitrification percent that comparison is high as required.
Standard biologic denitrification dephosphorization technique is the arrangement form of anaerobism (A1)/anoxia (A2)/aerobic (O).This is arranged in and recognizes based on such a in theory, that is: the whether abundant of phosphorus level is effectively released in poly-phosphorus microorganism, dephosphorization ability for improving system has 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, anaerobic zone can be had a negative impact by the nitrate in returned sludge；Owing to anoxic zone is positioned in the middle part of system, denitrification occupy minus advantage on carbon source is distributed, thus have impact on the denitrification effect of system；In order to reduce the nitrate in returned sludge, it is necessary to improving mixed-liquor return amount, the raising of capacity of returns 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 model of activated sludge process, has dephosphorization denitrogenation function, and its Aeration tank is the irrigation canals and ditches closed, and the mixed liquor of waste water and activated sludge constantly circulates wherein, and therefore oxidation ditch has another name called " continuous cyclic aeration method ".It is provided with in ditch and turns brush or plate-spinning, there is characteristic nitrated, denitrifying, before oxidation ditch, increase an anaerobic selection pond, just constitute biological carbon and phosphorous removal system.Sewage and returned sludge initially enter anaerobic selection pond, about 1 hour time of staying, complete the release of phosphorus in anaerobic pond, and improve the settleability of mud, and then mixed liquor enters oxidation ditch and carries out nitrated, denitrification, it is achieved denitrogenation dephosphorizing.
SBR method collection aeration, it is deposited in a pond, it is not necessary to second pond.Within the system, reaction tank is full of sewage in a certain time interval, runs with delayed time system, after the time that after process, mixed liquor precipitation is one predetermined, gets rid of supernatant from pond.Typical SBR system is divided into: water-filling, reaction, precipitation, draining and idle 5 stages, SBR method passes through oxygenation, the consecutive variations of anoxia and anaerobic condition can meet the growth of multiple-microorganism, hocket different bioprocesss, thus realizing hydrolysis, the removal of organic carbon and denitrogenation dephosphorizing process, reduce BOD5, COD, nitrated, the purpose of denitrogenation and dephosphorization.The CAST method system of improvement is provided with biological selecting area, constantly being refluxed to biological selecting area by main reaction region, mud absorbs the degradable part in ease of solubility substrate, and promotes floc microbe to grow, owing to biological selecting area should adopt the anaerobism method of operation, thus improve biological phosphor-removing effect.
Summary of the invention
For the weak point that this area exists, the purpose of the present invention is to propose to 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 with second pond or the CAST technique main reaction region of biochemical treatment system by entering mud pipe,
Described effluent denitrification pond is connected above supernatant pipe, and described supernatant is delivered to anoxic zone or the main reaction region of oxidation ditch origin or beginning and second pond or CAST process system；
Described effluent denitrification pond is connected above supernatant pipe, and the anoxic zone of described supernatant pipe and AAO technique or oxidation ditch origin or beginning and second pond are connected；Described enter in the middle of mud pipe import is positioned at bottom effluent denitrification pond, described effluent denitrification pond is provided with multiple swash plate near the side entering mud pipe import, swash plate spacing is 50-60mm, supernatant water leg is being set away from entering mud pipe inlet side, described supernatant water leg connects supernatant sump, and described supernatant sump is connected with biochemical treatment system by supernatant pipe；
Described biochemical treatment system is the one in AAO technology processing system, CAST technology processing system, the front end oxidation ditch process process system with anaerobic zone.
As one embodiment of the present invention, described biochemical treatment system is AAO technology processing system or front end processes system with the oxidation ditch process of anaerobic zone, passing through to be connected into mud pipe with bottom second pond bottom described effluent denitrification pond, described supernatant sump is connected by supernatant pipe and anoxic zone or oxidation ditch origin or beginning and second pond；
As the another embodiment of the present invention, described biochemical treatment system is CAST technology processing system, passes through to be connected into mud pipe with bottom main reaction region bottom described effluent denitrification pond, and described supernatant sump is connected with main reaction region by supernatant pipe.
Preferably, the angle of described swash plate and horizontal plane is 50-60 °, and the long 0.8-1.2 rice of swash plate, from 1.5-3 rice at the bottom of pond bottom swash plate.
Wherein, dredging tube is had bottom described effluent denitrification pond, described dredging tube is perforation dredging tube, described dredging tube is 4-6 root, dredging tube is divided into two groups, being 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.
Entering the sewage in effluent denitrification pond in the process upwards risen, bulky grain mud is precipitated at the bottom of pond gradually downward along swash plate, and the bottom mud extraction concentration in final effluent denitrification pond is 18～20g/L.After avoiding immersible pump sucking sludge a period of time, the concentration of sucking sludge becomes inhales, and funneling effect occurs, is adopting perforated pipe to inhale mud at the bottom of pond, and 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 made to enter from cell body side, swash plate through middle and upper part, pond, particles settling in mud is at the bottom of pond, and supernatant is collected by top water leg and be delivered to the anoxic zone of AAO technique (or oxidation ditch origin or beginning) and second pond；Or supernatant drains into the main reaction region of CAST process system.
Adopt effluent denitrification pond, decrease the sludge quantity entering biochemistry pool, but owing to sludge concentration is greatly improved, 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 is greatly reduced, and nitrate nitrogen can be controlled in 2mg/L to 5mg/L.
Wherein, the mud bottom the entrance effluent denitrification pond sedimentation time in effluent denitrification pond is 1-2 hour, and then supernatant is collected by top water leg and be delivered to the anoxic zone (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 anaerobic zone or the biological selecting area of CAST technique again, and it is 0.3-0.6:1 that mud enters the flow of anaerobic zone with the ratio of inflow, and it is 0.1-0.2:1 that mud enters the flow of CAST technique biological selecting area with the ratio of inflow.
If the denitrification effect that system requirements is best, it is possible to suitable carbon source will be added in supernatant.Particularly as follows: from effluent denitrification pond discharge supernatant be delivered to anoxic zone before, 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 methanol 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 discharged from effluent denitrification pond is delivered to second pond, and the outlet pipe connected through second pond directly discharges.So can reduce the water yield entering biochemical reaction tank, increase the actual time of staying.
The beneficial effects of the present invention is:
1, effluent denitrification pond improves sludge concentration, and mud, through endogenous respiration denitrification, is substantially reduced nitrate amount, decreases mud and biochemical reaction tank anaerobism section is released the impact of phosphorus, 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 entering mud amount decreases the dilution to biochemistry pool water-inlet carbon source.Strengthen the biochemical reaction utilization to carbon source.
3, the mud discharge entering biochemical reaction tank due to effluent denitrification pond after processing is less, therefore correspondingly extends the time of staying entering biochemical reaction tank, thus improving 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 precipitates is greatly improved, and strengthens disposal ability and the treatment effeciency of follow-up sludge treating system.
Accompanying drawing explanation
Fig. 1 is anaerobic-anoxic-aerobic process flow chart in prior art.
Fig. 2 is the flow chart that the effluent denitrification process that the present invention proposes combines with AAO technique.
Fig. 3 is the flow chart that the effluent denitrification process that the present invention proposes combines with oxidation ditch process
Fig. 4 is the flow chart that the effluent denitrification process that the present invention proposes combines with CAST technique
Fig. 5 is effluent denitrification pond top view.
nullIn figure，1 is water inlet pipe，2 is anaerobic zone，3 is anoxic zone，4 is aerobic zone，5 is mixed-liquor return pipe，6 is second pond，7 is exteenal reflux sludge pipe，8 is excess sludge discharge pipe，9 is outlet pipe，10 is into mud pipe，11 is cell body，12 is swash plate，13 is supernatant water leg，14 is supernatant braiding channel，15 is swash plate edge support，16 is perforation dredging tube，17 is residual sludge pump，18 is residual sludge pump hole，19 is excess sludge sludge out pipe，20 is valve，21 is supernatant sump，22 is supernatant outlet pipe，23 is supernatant liquid pump，24 is sludge reflux pump，25 is sludge reflux pump hole，26 is mud return line，27 is effluent denitrification pond，28 is supernatant pipe，29 is oxidation ditch，30 is biological selecting area，31 is CAST technique main reaction region.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
Embodiment 1: effluent denitrification pond combines with AAO technique
The equipment that effluent denitrification pond combines with AAO technique, referring to Fig. 2 and Fig. 5, including the reaction tank lattice being used as anaerobic zone 2, anoxic zone 3, aerobic zone 4 and second pond 6, anaerobic zone 2, anoxic zone 3, aerobic zone 4 and second pond 6 pass sequentially through pipeline and connect, and aerobic zone 4 and anoxic zone 3 are connected by mixed-liquor return pipe 5.
Passing 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 mud pipe import, and swash plate 12 swash plate edge support 15 supports, and swash plate edge support 15 is fixed on the inwall of cell body 11.The angle of swash plate and horizontal plane is 50-60 °, and swash plate length 1 meter, from the bottom of pond 2 meters bottom swash plate.
Effluent denitrification pond 27 is connected above supernatant pipe 28, and supernatant pipe 28 is connected with anoxic zone and second pond, supernatant pipe 28 pipeline arranges valve to control supernatant and enters anoxic zone or second pond.
Arranging supernatant water leg 13 (top in pond) away from entering mud pipe inlet side, supernatant water leg 13 connects supernatant sump 21, and supernatant sump 21 is connected with anoxic zone 3 by supernatant pipe 28, supernatant liquid pump 23；
Four dredging tubes 16 are positioned at bottom effluent denitrification pond, are connected with excess sludge sludge out pipe 19 and mud return line 26 respectively, 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 arranged on the pipeline of excess sludge sludge out pipe 19 is also dry-type centrifugal pump.Dredging tube 16 is perforation dredging tube, 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
Flow of inlet water is 40000m3/ day, influent quality is:
BOD5≤160mg/L；CODcr≤300mg/L；SS≤180mg/L；TN≤45mg/L；NH3-N≤35mg/L；TP≤4mg/L.
Use the effluent denitrification pond of embodiment 1, pending sewage disposal is according to AAO biochemical reaction technique, it is introduced into anaerobic zone 2, sequentially enter anoxic zone, aerobic zone and second pond to process, second pond mud extraction effluent enters sludge denitrification pond, the time of staying is 1 hour, the nitrate concentration entering effluent denitrification pond is 15mg/L, the sludge concentration entered is 8000mg/L (moisture content is 99.2%), the sludge concentration flowed out from sludge denitrification pond is 18000mg/L, and nitrate concentration is 3mg/L.Mud through endogenous respiration anti-nitration reaction flows into the anaerobic zone 2 of AAO reaction tank again, it is 0.5:1 with the ratio of inflow that mud enters the flow of anaerobic zone 2 of AAO reaction tank, improve the sludge concentration entering anaerobism section, decrease the nitrate impact on anaerobic phosphorus release.Remaining mud is discharged via excess sludge pipe 8.
Supernatant is collected by the water leg above effluent denitrification pond, is collected into supernatant braiding channel 14, is delivered to anoxic zone.
When water outlet total nitrogen is less than 10mg/L, the supernatant discharged from effluent denitrification pond is delivered to second pond, and the outlet pipe connected through second pond directly discharges.
Final outflow water water quality is:
BOD5≤8mg/L；CODcr≤45mg/L；SS≤10mg/L；TN≤10mg/L；NH3-N≤1mg/L；TP≤0.5mg/L.
Water outlet has reached 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
Flow of inlet water is 30000m3/ day, influent quality is:
BOD5≤180mg/L；CODcr≤330mg/L；SS≤190mg/L；TN≤40mg/L；NH3-N≤30mg/L；TP≤3mg/L.
Referring to Fig. 3, use the effluent denitrification pond of embodiment 1, pending sewage disposal is introduced into anaerobic zone 2, entering back into oxidation ditch 29 and second pond processes, second pond mud extraction effluent enters sludge denitrification pond, and the time of staying 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 inflow, improves the sludge concentration entering anaerobism section, decreases the nitrate impact on anaerobic phosphorus release.Remaining mud is discharged via excess sludge pipe 8.
Supernatant is collected by the water leg above effluent denitrification pond, is collected into supernatant braiding channel 14, is delivered to second pond 6.Final outflow water water quality is:
BOD5≤6mg/L；CODcr≤40mg/L；SS≤9mg/L；TN≤10mg/L；NH3-N≤1mg/L；TP≤0.5mg/L.
Water outlet has reached 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
Flow of inlet water is 20000m3/ day, influent quality is:
BOD5≤200mg/L；CODcr≤350mg/L；SS≤180mg/L；TN≤45mg/L；NH3-N≤36mg/L；TP≤3mg/L.
Referring to Fig. 4, pending sewage disposal is according to CAST biochemical reaction technique, it is introduced into biological selecting area 30, sequentially entering CAST main reaction region 31 to process, mud extraction effluent in main reaction region enters sludge denitrification pond, and the time of staying 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, it is 0.1:1 with the ratio of inflow that mud enters the flow of biological selecting area 30 of CAST technique, improve the sludge concentration entering biological selecting area, decrease the nitrate impact on anaerobic phosphorus release.
Supernatant is collected by the water leg above effluent denitrification pond, is collected into supernatant 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:
BOD5≤7mg/L；CODcr≤50mg/L；SS≤10mg/L；TN≤10mg/L；NH3-N≤2mg/L；TP≤0.5mg/L.
Water outlet has reached country's " urban wastewater treatment firm pollutant emission standard " one-level A standard.
Claims (6)
1. an effluent denitrification process, it is characterized in that, mud bottom second pond or CAST technique main reaction region enters bottom effluent denitrification pond, mud is made to enter from cell body side, swash plate through middle and upper part, pond, particles settling in mud is at the bottom of pond, and supernatant is collected by top water leg and be delivered to the anoxic zone of AAO technique or oxidation ditch origin or beginning and second pond；Or supernatant drains into the main reaction region of CAST process system；The mud bottom the entrance effluent denitrification pond sedimentation time in effluent denitrification pond is 1-2 hour, and then supernatant is collected by top water leg and be delivered to anoxic zone or the main reaction region of oxidation ditch origin or beginning and second pond or CAST process system；The mud of sedimentation flows into anaerobic zone or the biological selecting area of CAST technique again, and it is 0.3-0.6:1 that mud enters the flow of anaerobic zone with the ratio of inflow, and it is 0.1-0.2:1 that mud enters the flow of CAST technique biological selecting area with the ratio of inflow；
Wherein, pass through to be connected into the mud pipe second pond with biochemical treatment system or CAST technique main reaction region in described effluent denitrification pond,
Described effluent denitrification pond is connected above supernatant pipe, and described supernatant is delivered to anoxic zone or the main reaction region of oxidation ditch origin or beginning and second pond or CAST process system；
Described enter in the middle of mud pipe import is positioned at bottom effluent denitrification pond, described effluent denitrification pond is provided with multiple swash plate near the side entering mud pipe import, swash plate spacing is 50-60mm, supernatant water leg is being set away from entering mud pipe inlet side, described supernatant water leg connects supernatant sump, and described supernatant sump is connected with biochemical treatment system by supernatant pipe；It is provided with dredging tube bottom described effluent denitrification pond, described dredging tube is perforation dredging tube, described dredging tube is 4-6 root, dredging tube is divided into two groups, being 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 and excess sludge sludge out pipe is provided with pump and valve；Described pump is dry-type centrifugal pump；
Described biochemical treatment system is the one in AAO technology processing system, CAST technology processing system, the front end oxidation ditch process process system with anaerobic zone.
2. effluent denitrification process according to claim 1, it is characterized in that, described biochemical treatment system is AAO technology processing system or front end processes system with the oxidation ditch process of anaerobic zone, pass through to be connected into mud pipe with bottom second pond bottom described effluent denitrification pond, described supernatant sump is connected with anoxic zone or oxidation ditch origin or beginning by supernatant pipe, and and second pond connection.
3. effluent denitrification process according to claim 1, it is characterized in that, described biochemical treatment system is CAST technology processing system, passes through to be connected into mud pipe with bottom main reaction region bottom described effluent denitrification pond, and described supernatant sump is connected with main reaction region by supernatant pipe.
4. effluent denitrification process according to claim 1, it is characterised in that the angle of described swash plate and horizontal plane is 50-60 °, and the long 0.8-1.2 rice of swash plate, from 1.5-3 rice at the bottom of pond bottom swash plate.
5. effluent denitrification process according to claim 1, it is characterised in that from effluent denitrification pond discharge supernatant be delivered to biochemical reaction zone before, add carbon source, the carbon source dosage nitrate according to required removal, by 3～5 times of inputs；Described carbon source is methanol or acetate.
6. effluent denitrification process according to claim 1, it is characterised in that when water outlet total nitrogen is less than 10mg/L, the supernatant discharged from effluent denitrification pond is fed directly to second pond, and the outlet pipe connected through second pond directly discharges.
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