CN104445833B - A kind of method of wastewater biochemical denitrogenation - Google Patents
A kind of method of wastewater biochemical denitrogenation Download PDFInfo
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- CN104445833B CN104445833B CN201410811805.4A CN201410811805A CN104445833B CN 104445833 B CN104445833 B CN 104445833B CN 201410811805 A CN201410811805 A CN 201410811805A CN 104445833 B CN104445833 B CN 104445833B
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 239000002351 wastewater Substances 0.000 title claims abstract description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000007788 liquid Substances 0.000 claims abstract description 62
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000010457 zeolite Substances 0.000 claims abstract description 54
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 35
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000011069 regeneration method Methods 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000001179 sorption measurement Methods 0.000 claims abstract description 8
- 239000010802 sludge Substances 0.000 claims description 53
- 241000894006 Bacteria Species 0.000 claims description 16
- 238000006396 nitration reaction Methods 0.000 claims description 14
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 13
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 12
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 12
- 230000008929 regeneration Effects 0.000 claims description 12
- 238000005273 aeration Methods 0.000 claims description 11
- 229910002651 NO3 Inorganic materials 0.000 claims description 9
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 7
- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 5
- 239000005416 organic matter Substances 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 108090000913 Nitrate Reductases Proteins 0.000 claims description 4
- LFLZOWIFJOBEPN-UHFFFAOYSA-N nitrate, nitrate Chemical compound O[N+]([O-])=O.O[N+]([O-])=O LFLZOWIFJOBEPN-UHFFFAOYSA-N 0.000 claims description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 9
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 238000001311 chemical methods and process Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- 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 2
- 239000013043 chemical agent Substances 0.000 description 2
- 239000010808 liquid waste Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000050 nutritive effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 241000108664 Nitrobacteria Species 0.000 description 1
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000005446 dissolved organic matter Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910001723 mesolite Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (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 discloses a kind of method of wastewater biochemical denitrogenation, the A/O biological denitrification process of improvement is adopted to be combined with chemical process and zeolite adsorption ammonia nitrogen method, ammonia nitrogen in waste water is carried out efficient Transformatin, the denitrification liquid flowed out in anoxic denitrification pond enters aerobic nitrification pond and forms internal recycle, and remains denitrification liquid and directly enter settling tank solid-liquid separation; Coupled ion absorption and bio-regeneration process, make the total nitrogen��5mg/L of water outlet in water outlet, the clearance of total nitrogen, higher than 90%, is stablized and is met the requirement that water outlet total nitrogen in Taihu Lake basin chemical industrial park is better than " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) primary standard A standard.
Description
Technical field
The invention belongs to field of environment engineering technology, it is specifically related to a kind of method of wastewater biochemical denitrogenation.
Background technology
Along with the develop rapidly of Taihu Lake basin economy, the wastewater flow rate of the industry discharges such as chemical industry is increasing, water quality is complicated, nitrogen element exists in a large number as nutritive element, waste water difficult degradation, salinity height, biodegradability are poor, it is the main source of Taihu Lake basin polluted by nitrogen, thus causes Taihu Lake water body eutrophication pollution serious, cause blue algae bloom. water pollution brings serious harm to hydrobiont and surrounding enviroment, for this problem, and in conjunction with special investigation result, environmental administration of Jiangsu Province has organized to set up " TAI HU AREA urban wastewater treatment firm and the main water pollutant emission limit of priority industry industry " (Jiangsu Province provincial standard DB32), and the requirement that Taihu Lake basin chemical industrial park town sewage work strict implement is better than " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) primary standard A standard is proposed, as shown in table 1, especially the requirement of total nitrogen��5mg/L is performed, limit factory, enterprise is to the discharge of N nutritive element.
Table 1 basic controlling project the highest permission emission concentration (day average) unit mg/L
Common denitrogenation method has materialization denitrogenation method and biochemical denitrification method, and owing to the removal effect of physics denitride technology is not obvious, operation and maintenance cost aspect are very expensive; The chemical agent that chemistry denitride technology adds is uneconomical, and the liquid waste disposal difficulty produced, running cost height, and very likely bring secondary pollution to environment, thus bio-denitrification technology as one relatively Economic contrast process method for waste water efficiently, be widely used in wastewater treatment.
In the biological denitrification process of current comparatively mature and reliable, most of project adopts traditional anaerobic-aerobic (A/O) active sludge denitrification process, in this technique, in water outlet, denitrification effect can reach about 80%, in water outlet, part nitrogen is not thorough denitrifying nitre nitrogen or nitrite nitrogen, causes total nitrogen in water outlet to be far longer than 5mg/L.
Traditional A/O process characteristic is the series model of anaerobic-aerobic-precipitation, ammonia nitrogen in waste water is NO3-N and NO2-N by oxidation by nitrobacteria under aerobic condition, a large amount of NO3-N and NO2-N is back to anoxic denitrification pond again, it is reduced to nitrogen through denitrifying bacteria effect, enters air thus reach the object of denitrogenation. But under this kind of processing condition, carry out precipitate and separate owing to the nitrification liquid in aerobic nitrification pond directly enters settling tank, thus containing nitre nitrogen and nitrite nitrogen in water outlet, cause nitrogen removal rate not high; In addition, in the excess sludge that system is discharged, only some mud experienced by complete anoxic and aerobic process, mud age of system sludge because of take into account nitrifier growth and can not be too short, cause denitrification effect to be difficult to further improve. Therefore traditional A/O technique exists in water outlet containing nitre nitrogen usually, basicity is not enough and mud not equal many technical problems in age needed for biological denitrificaion, for the requirement (particularly TN��5mg/L) being reached nitrogen phosphorus index in the waste water of chemical industrial park and being better than the one-level A standard of " urban wastewater treatment firm pollutant emission standard " (GB18918-2002), still there is very Da I Member distance.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides the A/O biological denitrification process of a kind of improvement, ammonia nitrogen in waste water is carried out efficient Transformatin by bound zeolite absorption method, reaches the requirement that residual nitrogen index in waste water is better than the one-level A standard of " urban wastewater treatment firm pollutant emission standard " (GB18918-2002).
Technical scheme: a kind of method of denitrogenation of waste water, comprises the following steps:
1), anoxic denitrification section: mainly carry out denitrogenation and organic matter degradation in anoxic denitrification pond, nitrogenous effluent enters anoxic denitrification pond, what enter also has the nitrification liquid from aerobic nitrification pond simultaneously, active sludge and zeolite containing denitrifying bacteria coexist in anoxic denitrification pond, stir, make mud in anoxic denitrification pond be suspension flow state; Ammonia nitrogen in zeolite adsorption nitrogenous effluent, under anoxic conditions, organism utilizes nitrate oxidized degraded removal as electron acceptor(EA) under the effect of denitrifying bacteria, and nitrate, nitrate reductase are become N2Release is discharged; Denitrification liquid after anti-nitration reaction is back to aerobic nitrification pond, and residue denitrification liquid then directly enters settling tank;
2), aerobic nitrification section: mainly carry out the nitrated of ammonia nitrogen and zeolite regeneration in aerobic nitrification pond, what enter also has the backflow active sludge containing nitrifier from settling tank simultaneously, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, ammonia nitrogen and zeolite take off attached simultaneously so that zeolite regeneration;
3), precipitating phase: the residue denitrification liquid in anoxic denitrification pond directly enters settling tank, leave standstill, solid-liquid separation, discharge supernatant liquor and obtain process water, the active sludge of lower floor is divided into two classes: backflow activity sludge reflux is to aerobic nitrification tank, outside remaining excess sludge timing discharge system, directly carry out processed.
Further, in the present invention, described step 1) in, residue denitrification liquid first carries out aeration before entering settling tank, the organism that dissolved oxygen still remains after anoxic denitrification pond acts on oxidative degradation is provided, meanwhile, enter the dissolved oxygen concentration that the mixed solution of settling tank needs maintenance certain usually, to prevent anti-nitration reaction in settling tank.
Further, in the present invention, in described step 1) in, carry out aeration when the denitrification liquid in anoxic denitrification pond enters aerobic nitrification pond, with the dissolved oxygen increased in aerobic nitrification pond, promote that nitrification carries out.
Further, in the present invention, the return sludge ratio of described backflow active sludge is 30%��100%. Return sludge ratio directly affects the concentration of active sludge in aerobic nitrification pond and the sedimentation situation of settling tank.
Further, in the present invention, the return current ratio of the mixed liquid of described denitrification liquid is 200%��400%. In return sludge ratio one timing, if the nitrate concentration that aerobic nitrification pond produces is higher, then need the water outlet requirement that bigger return current ratio of the mixed liquid just can reach same, return current ratio of the mixed liquid increases, nitric efficiency is improved, the return current ratio of the mixed liquid of 200%��400% just can make its recirculation experience denitrification, thus realizes effectively removing the object of nitrate; And the nitrate removal rate that the return current ratio of the mixed liquid more than 400% can not significantly improve again, backflow institute consumed power is caused to increase on the contrary, cause running cost to rise, the dissolved oxygen in aerobic nitrification pond can be caused simultaneously to be too much back to anoxic denitrification pond, affect whole technical process.
Further, in the present invention, in described step 3) in, when excess sludge timing is discharged outside system, owing to there being a small amount of zeolite to be discharged thereupon, therefore add zeolite in aerobic nitrification tank and/or anoxic denitrification pond, the MLSS in each biological treatment tank is maintained high density, to improve nitrification speeds and denitrification speed.
Further, in the present invention, the supplementary amount of described zeolite is 50��60mg/L, fills up the vacancy of the zeolite being discharged, the balance of keeping system mesolite total amount, ensures that the absorption of ammonia nitrogen and denitrification reaction normally run.
Further, in the present invention, the particle diameter of described zeolite is 45��55 ��m, the zeolite proportion of this size and water close to and be not easily sunken at the bottom of pond, be easy to stirring suspension and flow.
Further, in the present invention, described zeolite is modified zeolite.
Useful effect:
One, the denitrification liquid flowed out in anoxic denitrification pond enters aerobic nitrification pond and forms nitrification-denitrification internal recycle, it is to increase the denitrification efficiency of nitre nitrogen and the mud age of active sludge and recycle rate, and effectively maintains the suitable basicity of reaction process and pH environment; And remain denitrification liquid and directly enter settling tank solid-liquid separation, prevent from water outlet contains nitre nitrogen and nitrite nitrogen, therefore do not need to increase again the 2nd anoxic denitrification pond and remove nitre nitrogen and nitrite nitrogen, decrease operation steps, reduce running cost.
Two, adsorption selection capacity greatly and can make sorbent material by the biochemical zeolite regenerated, and can not impel zeolite regeneration because adding chemical agent and produce secondary liquid waste; And zeolite circulates regeneration in technical process, and discharge is few, therefore increment is few, and running cost is cheap;
The improvement A/O biochemical denitrification technique of coupled ion of the present invention absorption and regeneration method, make the clearance of the total nitrogen of water outlet higher than 90%, total nitrogen��5mg/L, meets the emission request that the total nitrogen of water outlet is better than " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) primary standard A standard.
Accompanying drawing explanation
Accompanying drawing 1 is the process flow diagram of the method for wastewater biochemical denitrogenation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, a kind of method of denitrogenation of waste water dephosphorization, it is characterised in that: comprise the following steps:
1), anoxic denitrification section: mainly carry out denitrogenation and organic matter degradation in anoxic denitrification pond 3, nitrogenous effluent 1 enters anoxic denitrification pond 2, what enter also has the nitrification liquid 5 from aerobic nitrification pond 4 simultaneously, stirs, makes mud in anoxic denitrification pond be suspension flow state; Active sludge and zeolite containing denitrifying bacteria coexist in anoxic denitrification pond 3, ammonia nitrogen in zeolite adsorption nitrogenous effluent 1, under anoxic conditions, organism utilizes the oxidized degraded removal as electron acceptor(EA) of nitrate, nitrite under the effect of denitrifying bacteria, and nitrate, nitrate reductase are become N2Release is discharged, it is achieved sewage harmless treatment; Denitrification liquid 3 after anti-nitration reaction is back to aerobic nitrification pond 4, and the return current ratio of the mixed liquid of denitrification liquid 3 is 200%��400%, carries out aeration when denitrification liquid 3 enters aerobic nitrification pond 4; The part active sludge of residue denitrification liquid 7 and bottom then directly enters settling tank 8 in pipeline section after short period of time aeration;
2), aerobic nitrification section: mainly carry out the nitrated of ammonia nitrogen and zeolite regeneration in aerobic nitrification pond 4, what enter also has the backflow active sludge 10 containing nitrifier from settling tank 8 simultaneously, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, ammonia nitrogen and zeolite take off attached simultaneously so that zeolite regeneration;
3), precipitating phase: the residue denitrification liquid 7 in anoxic denitrification pond 2 directly enters settling tank 8, leave standstill, solid-liquid separation, discharge supernatant liquor and obtain process water 9, the active sludge of lower floor is divided into two classes: a part is back to aerobic nitrification pond 4 for backflow active sludge 10, and the return sludge ratio of the active sludge 10 that refluxes is 30%��100%; Another part is outside remaining excess sludge 11 timing discharge system, directly carries out processed; When excess sludge 11 timing is discharged outside system, adding zeolite in aerobic nitrification tank 4 or anoxic denitrification pond 2, the supplementary amount of zeolite is 50��60mg/L, and the particle diameter of zeolite is 45��55 ��m, and zeolite is preferably modified zeolite.
In aerobic nitrification pond 4, nitrification liquid 5 after nitration reaction enters in anoxic denitrification pond 2, and nitrite nitrogen and nitre nitrogen in nitrification liquid 5 are reduced to N by denitrifying bacteria under anoxic conditions2Release is discharged, and the zeolite after simultaneously regenerating continues the ammonia nitrogen in absorption nitrogenous effluent 1; Thereafter, the denitrification liquid 3 after denitrification is back to aerobic nitrification pond 4 again and carries out nitration reaction, thus forms the internal recycle of nitrification-denitrification;
Nitrifier is very responsive to pH, and the Optimal pH of nitration reaction is 8.0��8.4, and nitration reaction process can generate HNO3PH of mixed is declined, and the basicity that denitrification process produces can compensate the basicity that nitration reaction consumes. In the inner cyclic process of nitrification-denitrification, nitrifying process and denitrification process mutually provide and compensate pH environment required each other, the Optimal pH ensureing nitration reaction is 8.0��8.4, and the most optimum pH of anti-nitration reaction is 6.5��7.5, is greater than 8 or be less than 7 and be all unfavorable for that reaction carries out.
Anoxic denitrification pond is front, organic carbon in waste water is utilized by denitrifying bacteria, larger molecular organics is made to be decomposed into small organic molecule, insoluble organism changes into dissolved organic matter, when these through the product of anaerobic hydrolysis enter Aerobic Pond carry out aerobic treatment time, improve the biodegradability of sewage, it is to increase the efficiency of oxygen, therefore not only effectively remove BOD5, also can alleviate the organic loading in aerobic nitrification pond thereafter, prevent BOD5Excessive concentration, in active sludge, heterotrophic bacterium breeds rapidly, suppresses the growth of autotrophic bacteria and nitrifier that nitration reaction is stagnated.
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1
Taihu Lake basin chemical industrial park enterprise selects A/O biochemical denitrification technique that the present invention improves to receive the waste water of dirty pipe network carry out denitrogenation processing to entering municipal administration, the waste water quality of water inlet is as shown in table 2, the emission request of the equal serious non-compliance of every index " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) primary standard A standard.
The waste water quality situation that table 2 is intake
| Water-quality guideline | Water temperature (DEG C) | pH | SS(mg/L) | BOD(mg/L) | TN(mg/L) | NH3-N(mg/L) |
| Content | 25 | 7.8 | 120 | 110 | 42 | 27 |
Concrete experiment condition is as shown in table 3, runs the process water taking settling tank water outlet to obtain after 2 months and again detects.
Table 3 experiment condition
Concrete processing step is as follows:
As shown in Figure 1, the method for wastewater biochemical denitrogenation of the present invention, specific as follows:
Taihu Lake basin chemical industrial park enterprise enters municipal administration, and to receive the waste water of dirty pipe network be object, and the method carrying out the present invention carries out experimental verification, and technical process is as shown in Figure 1. This test zeolite used derive from Henan Gongyi city plumbing equipment factory produce particle diameter be 50 ��m of powdery zeolites after modification.
1), nitrogen-containing wastewater 1 is introduced in anoxic denitrification pond 2, there is the nitrification liquid 5 from aerobic nitrification pond 4 to pass back in anoxic denitrification pond 2 simultaneously, stir, mud in anoxic denitrification pond 2 is made to be suspension flow state, ammonia nitrogen in zeolite adsorption part water in mud on the one hand, denitrifying bacteria in the nitrification liquid 5 of backflow relies on zeolite to be carrier on the other hand, propagation is when anoxic, utilize the BOD in nitrate nitrogen and nitrite nitrogen and waste water, generate nitrogen, escape in air, thus remove part ammonia nitrogen and BOD;
2) the most of denitrification liquid 3, in anoxic denitrification pond 2 is back in aerobic nitrification pond 4, and the ammonia nitriding that zeolite adsorbs is nitrite nitrogen and nitrate nitrogen by the nitrifier in aerobic nitrification pond 4, takes off attached with zeolite so that zeolite is able to bio-regeneration;
By a part of denitrification liquid 7 remaining in anoxic denitrification pond 2, introducing in settling tank 8, solid-liquid separation, supernatant liquor 9 is the process water that SS, BOD, nitric nitrogen and ammonia nitrogen are all highly removed, and discharges outside system by supernatant liquor 9; The active sludge of lower floor, major part mud 10 is back in aerobic nitrification pond 4 and anoxic denitrification pond 2, and the mud 11 of nubbin is discharged outside system, directly carries out processed;
3), the reacted nitrification liquid 5 in aerobic nitrification pond 4 be back in anoxic denitrification pond 2, enter the circulation that next is taken turns.
Pipeline section between anoxic denitrification pond 2 and settling tank 8 carries out the aeration of short period of time to remove BOD. When excess sludge 11 timing is discharged outside system, in aerobic nitrification tank 4 and anoxic denitrification pond 2, add zeolite 55mg/L.
Embodiment 2
The waste water quality of water inlet identical with embodiment 1 and concrete experiment condition, run the process water taking settling tank water outlet to obtain after 2 months and again detect.
Concrete processing step is as follows:
1), anoxic denitrification section: mainly carry out denitrogenation and organic matter degradation in anoxic denitrification pond 3, nitrogenous effluent 1 enters anoxic denitrification pond 2, what enter also has the nitrification liquid 5 containing nitric nitrogen from aerobic nitrification pond 4 simultaneously, stir, make mud in anoxic denitrification pond be suspension flow state; Active sludge and zeolite containing denitrifying bacteria coexist in anoxic denitrification pond 2, ammonia nitrogen in zeolite adsorption nitrogenous effluent 1, under anoxic conditions, organism utilizes the oxidized degraded removal as electron acceptor(EA) of nitrate, nitrite under the effect of denitrifying bacteria, and nitrate, nitrate reductase are become N2Release is discharged; Denitrification liquid 3 after anti-nitration reaction is back to aerobic nitrification pond 4, and the return current ratio of the mixed liquid of denitrification liquid 3 is 250%, carries out aeration when denitrification liquid 3 enters aerobic nitrification pond 4; The part active sludge of residue denitrification liquid 7 and bottom then directly enters settling tank 8 in pipeline section after short period of time aeration;
2), aerobic nitrification section: mainly carry out the nitrated of ammonia nitrogen and zeolite regeneration in aerobic nitrification pond 4, what enter also has the backflow active sludge 10 containing nitrifier from settling tank 8 simultaneously, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, ammonia nitrogen and zeolite take off attached simultaneously so that zeolite regeneration;
3) precipitating phase: the residue denitrification liquid 7 in anoxic denitrification pond 2 directly enters settling tank 8, leaves standstill, solid-liquid separation, discharges supernatant liquor and obtains SS, BOD5, the process water 9 all highly removed of TP, nitre nitrogen and ammonia nitrogen, the active sludge of lower floor is divided into two classes: a part is back to aerobic nitrification pond 4 for backflow active sludge 10, and the return sludge ratio of backflow active sludge 10 is 75%; Another part is outside remaining excess sludge 11 timing discharge system, directly carries out processed; When excess sludge 11 timing is discharged outside system, in aerobic nitrification tank 4, add the modified zeolite 50mg/L that particle diameter is 55 ��m.
Embodiment 3
The waste water quality of water inlet identical with embodiment 1 and concrete experiment condition, run the process water taking settling tank water outlet to obtain after 2 months and again detect.
Concrete processing step is as follows:
1), anoxic denitrification section: mainly carry out denitrogenation and organic matter degradation in anoxic denitrification pond 3, nitrogenous effluent 1 enters anoxic denitrification pond 2, what enter also has the nitrification liquid 5 containing nitric nitrogen from aerobic nitrification pond 4 simultaneously, stir, make mud in anoxic denitrification pond be suspension flow state; Active sludge and zeolite containing denitrifying bacteria coexist in anoxic denitrification pond 2, ammonia nitrogen in zeolite adsorption nitrogenous effluent 1, under anoxic conditions, organism utilizes nitrate oxidized degraded removal as electron acceptor(EA) under the effect of denitrifying bacteria, and nitrate reduction is become N2Release is discharged; Denitrification liquid 3 after anti-nitration reaction is back to aerobic nitrification pond 4, and the return current ratio of the mixed liquid of denitrification liquid 3 is 350%, carries out aeration when denitrification liquid 3 enters aerobic nitrification pond 4; The part active sludge of residue denitrification liquid 7 and bottom then directly enters settling tank 8 in pipeline section after short period of time aeration;
2), aerobic nitrification section: mainly carry out the nitrated of ammonia nitrogen and zeolite regeneration in aerobic nitrification pond 4, what enter also has the backflow active sludge 10 containing nitrifier from settling tank 8 simultaneously, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, ammonia nitrogen and zeolite take off attached simultaneously so that zeolite regeneration;
3) precipitating phase: the residue denitrification liquid 7 in anoxic denitrification pond 2 directly enters settling tank 8, leaves standstill, solid-liquid separation, discharges supernatant liquor and obtains SS, BOD5, the process water 9 all highly removed of TP, nitre nitrogen and ammonia nitrogen, the active sludge of lower floor is divided into two classes: a part is back to aerobic nitrification pond 4 for backflow active sludge 10, and the return sludge ratio of backflow active sludge 10 is 50%; Another part is outside remaining excess sludge 11 timing discharge system, directly carries out processed; When excess sludge 11 timing is discharged outside system, in anoxic denitrification pond 2, add the modified zeolite 60mg/L that particle diameter is 45 ��m.
Embodiment 4
After the A/O denitrification process of the embodiment of the present invention 1, embodiment 2 and embodiment 3 improvement processes 2 months, the process water obtained carries out water quality detection, water treatment effect is obviously better than traditional A/O denitrification process, the stable emission request being better than " urban wastewater treatment firm pollutant emission standard " GB18918-2002 primary standard A standard of effluent quality index, the clearance of the total nitrogen of water outlet all higher than 90%, total nitrogen��5mg/L. Wherein the water quality situation of the process water that embodiment 1 obtains after processing is as shown in table 4, is 92.2% through calculating the clearance of total nitrogen, and removal effect is obvious.
Table 4 processes the water quality situation of water
| Water-quality guideline | Water temperature (DEG C) | pH | SS(mg/L) | BOD5(mg/L) | TN(mg/L) | NH3-N(mg/L) | NOx-N(mg/L) |
| Content | 24 | 7.6 | 5 | 6 | 2.1 | 0.6 | 0.8 |
The above is only the preferred embodiment of the present invention; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the method for a wastewater biochemical denitrogenation, it is characterised in that: comprise the following steps:
1), anoxic denitrification section: mainly carry out denitrogenation and organic matter degradation in anoxic denitrification pond (2), nitrogenous effluent (1) enters anoxic denitrification pond (2), what enter also has the nitrification liquid (5) from aerobic nitrification pond (4) simultaneously, active sludge and zeolite containing denitrifying bacteria coexist in anoxic denitrification pond (2), stir, mud in anoxic denitrification pond (2) is made to be suspension flow state, ammonia nitrogen in zeolite adsorption nitrogenous effluent (1), under anoxic conditions, organism utilizes nitrate oxidized degraded removal as electron acceptor(EA) under the effect of denitrifying bacteria, and by nitrate, nitrate reductase becomes N2Release is discharged; Denitrification liquid (3) after anti-nitration reaction is back to aerobic nitrification pond (4), and residue denitrification liquid (7) then directly enters settling tank (8);
2), aerobic nitrification section: mainly carry out the nitrated of ammonia nitrogen and zeolite regeneration, what enter also has the backflow active sludge (10) containing nitrifier from settling tank (8) simultaneously, under aerobic condition, ammonium oxidation is that nitrite nitrogen changes into nitre nitrogen again by nitrifier, ammonia nitrogen and zeolite take off attached simultaneously so that zeolite regeneration;
3), precipitating phase: residue denitrification liquid (7) of anoxic denitrification pond (2) directly enters settling tank (8), leave standstill, solid-liquid separation, discharge supernatant liquor and obtain process water (9), the active sludge of lower floor is divided into two classes: backflow active sludge (10) is back to aerobic nitrification pond (4), outside remaining excess sludge (11) timing discharge system, directly carry out processed.
2. the method for wastewater biochemical denitrogenation according to claim 1, it is characterised in that: in described step 1) in, residue denitrification liquid (7) enters that settling tank (8) is front first carries out aeration.
3. the method for wastewater biochemical denitrogenation according to claim 1, it is characterised in that: in described step 1) in, carry out aeration when the denitrification liquid (3) of anoxic denitrification pond (2) enters aerobic nitrification pond (4).
4. the method for wastewater biochemical denitrogenation according to claim 1, it is characterised in that: the return sludge ratio of described backflow active sludge (10) is 30%��100%.
5. the method for wastewater biochemical denitrogenation according to claim 1, it is characterised in that: the return current ratio of the mixed liquid of described denitrification liquid (3) is 200%��400%.
6. the method for wastewater biochemical denitrogenation according to claim 1, it is characterized in that: described step 3) in, when excess sludge (11) timing is discharged outside system, in aerobic nitrification tank (4) or anoxic denitrification pond (2), add zeolite.
7. the method for wastewater biochemical denitrogenation according to claim 6, it is characterised in that: the supplementary amount of described zeolite is 50��60mg/L.
8. according to the method for the arbitrary described wastewater biochemical denitrogenation of claim 1 to 7, it is characterised in that: the particle diameter of described zeolite is 45��55 ��m.
9. according to the method for the arbitrary described wastewater biochemical denitrogenation of claim 1 to 7, it is characterised in that: described zeolite is modified zeolite.
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| CN109678245B (en) * | 2019-01-30 | 2021-06-08 | 西安建筑科技大学 | Water treatment operation method for enhancing biological denitrification based on optimal utilization of carbon source |
| CN110395801A (en) * | 2019-08-28 | 2019-11-01 | 西昌学院 | A method for simultaneous removal of ammonia nitrogen, nitrate nitrogen, iron and manganese in groundwater based on two-stage biofiltration column |
| CN111718069A (en) * | 2020-06-29 | 2020-09-29 | 禹智天工水环境科技有限公司太仓分公司 | Process and device for removing nitrate nitrogen in industrial wastewater treatment |
| CN114684925B (en) * | 2020-12-30 | 2023-03-24 | 中国石油化工股份有限公司 | Short-cut nitrification treatment method for ammonia-containing wastewater |
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