CN110776101A - Device for treating urban sewage by utilizing partial nitrosation-anaerobic ammonia oxidation process and method used by device - Google Patents
Device for treating urban sewage by utilizing partial nitrosation-anaerobic ammonia oxidation process and method used by device Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 59
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 230000003647 oxidation Effects 0.000 title claims abstract description 52
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 52
- 230000008569 process Effects 0.000 title claims abstract description 46
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 29
- 230000036961 partial effect Effects 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 104
- 239000010802 sludge Substances 0.000 claims abstract description 61
- 241000894006 Bacteria Species 0.000 claims abstract description 39
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000004062 sedimentation Methods 0.000 claims abstract description 25
- 239000003814 drug Substances 0.000 claims abstract description 21
- 230000001651 autotrophic effect Effects 0.000 claims abstract description 13
- 238000005273 aeration Methods 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 3
- 230000008676 import Effects 0.000 claims abstract description 3
- 210000003437 trachea Anatomy 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 80
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 47
- 229910052757 nitrogen Inorganic materials 0.000 claims description 40
- 239000000969 carrier Substances 0.000 claims description 21
- 238000009826 distribution Methods 0.000 claims description 20
- 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 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 12
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 10
- QALQXPDXOWOWLD-UHFFFAOYSA-N [N][N+]([O-])=O Chemical compound [N][N+]([O-])=O QALQXPDXOWOWLD-UHFFFAOYSA-N 0.000 claims description 6
- 235000019270 ammonium chloride Nutrition 0.000 claims description 6
- 235000010288 sodium nitrite Nutrition 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 4
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 4
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000005276 aerator Methods 0.000 claims description 2
- 241001226178 bacterium enrichment culture Species 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 abstract description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 4
- 238000009395 breeding Methods 0.000 abstract description 3
- 230000001488 breeding effect Effects 0.000 abstract description 3
- 238000005262 decarbonization Methods 0.000 abstract description 2
- 241000230247 environmental samples <Bacteria> Species 0.000 abstract description 2
- 241001453382 Nitrosomonadales Species 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 10
- 238000012258 culturing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000009935 nitrosation Effects 0.000 description 3
- 238000007034 nitrosation reaction Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000010718 Oxidation Activity Effects 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- 241001180199 Planctomycetes Species 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 238000005315 distribution function Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
A device for treating urban sewage by using a partial nitrosation-anaerobic ammonia oxidation process comprises an anaerobic ammonia oxidation bacteria enrichment culture device and a continuous flow PN/A autotrophic biological denitrification device. Anaerobic ammonium oxidation bacterium enrichment breeding device is including joining in marriage water tank, liquid medicine bucket, enrichment breeding reactor and control system, continuous flow PN/A autotroph denitrification facility includes the intake pump, PN/A reactor, sedimentation tank, mud backwash pump and sludge discharge pump, and the intake pump extraction is through the municipal sewage of decarbonization pretreatment, and aeration equipment is established to PN/A reactor bottom, and its trachea is connected with the air-blower, and the import and the intake pump of PN/A reactor are connected, and the export and the access connection of sedimentation tank of PN/A reactor, the sludge discharge pipe of sedimentation tank bottom links to each other with sludge discharge pump and mud backwash pump respectively, and the pipeline that sludge discharge pipe and mud backwash pump link to each other is connected to on the pipeline that intake pump and PN/A reactor are connected. The device has the advantages of high starting speed, low concentration of nitrate in the effluent, stable operation and suitability for biological denitrification of urban sewage.
Description
Technical Field
The invention relates to the technical field of urban sewage treatment, in particular to a device for treating urban sewage by utilizing a partial nitrosation-anaerobic ammonia oxidation process for biological denitrification of the urban sewage and a method used by the device.
Background
Anammox is known as one of the most surprising environmental biotechnology, and since the anammox phenomenon was discovered in the last 90 th century, research on applying it to sewage treatment is becoming a hot spot. The anammox bacteria is a kind of autotrophic planctomycete, which can oxidize ammonia into nitrogen by using nitrite as an electron acceptor. The full-process autotrophic denitrification of sewage can be realized by effectively combining the functions of aerobic Ammonia Oxidizing Bacteria (AOB) and anaerobic ammonia oxidizing bacteria, and the process is called as a partial nitrosation-anaerobic ammonia oxidizing (PN/A) biological denitrification process. Compared with the traditional nitrification-denitrification biological denitrification process, the PN/A process only needs to oxidize partial ammonia nitrogen under aerobic conditions, and can save 60 percent of oxygen supply requirement; and no additional carbon source is needed, so that organic matters contained in the sewage are liberated and separated through a proper process technology, and the organic matters can be used for producing energy or recovering resources, so that the purposes of energy self-sufficiency and energy output in the sewage treatment process can be realized, and the process is an energy-saving new sewage treatment process with great application prospect.
At present, PN/A process is successfully applied to high ammonia nitrogen sewage treatment, and particularly in the treatment of sludge digestive fluid of a sewage treatment plant (namely a sidestream anaerobic ammonia oxidation process), hundreds of engineering application cases are provided all over the world. Since the last 90 s, the application of the PN/A process to the treatment of municipal sewage with relatively low ammonia nitrogen concentration has gained more and more research attention, and is generally correspondingly called as a 'mainstream anaerobic ammonia oxidation process' or a 'mainstream PN/A' process. Ammonia Nitrogen (NH) in municipal sewage
4 +-N) concentration is relatively low, nitrite Nitrogen (NO)
2 --N) as an intermediate product of the nitration reaction, which is readily utilized by nitrite-oxidizing bacteria (NOB) to form nitrate Nitrogen (NO)
3 -N), i.e. complete nitration in conventional processes. The competitive utilization of nitrite nitrogen by NOB and anaerobic ammonium oxidation bacteria is one of the most important challenges for stably realizing the mainstream PN/A process. In the mainstream process, the concentration of free ammonia and free nitrous acid is low, the inhibition effect on NOB is low, and the NOB is difficult to eliminate from the system, so that the anaerobic ammonia oxidizing bacteria become dominant bacteria. Therefore, the mainstream PN/a process is still under research and is not applied to industrial scale.
Because anammox bacteria have a long generation cycle and slow growth, granular sludge or attached (carrier/filler) growth biofilm is considered to be the main means for effectively retaining anammox bacteria. At present, in the research of enrichment culture of anammox bacteria in a laboratory, tap water is mostly adopted for water distribution, and enrichment culture is carried out by adding various nutrient substrates including ammonia nitrogen, nitrite nitrogen, iron salt, alkalinity, various trace elements and the like, but the mode is not suitable for large-scale culture of the anammox bacteria required for actual production.
In the current mainstream PN/a process related research, anammox species were essentially derived from the sidestream anammox process system that processes sludge digestate. In the case that no side flow process system provides anaerobic ammonia oxidation bacteria, the enrichment and cultivation process of the anaerobic ammonia oxidation bacteria is very difficult and slow due to the competitive growth of NOB, and the PN/A system is difficult to start in a relatively short time, so that the problems of high nitrogen concentration of nitrate in effluent of the system, unstable operation and the like are caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the device for treating the municipal sewage by using the partial nitrosation-anaerobic ammonia oxidation process, which has the advantages of low starting speed, low effluent nitrate concentration and stable operation and is suitable for biological denitrification of the municipal sewage.
It is another object of the present invention to provide a method for use in the above apparatus for treating municipal sewage using a partial nitrosation-anammox process.
As conceived above, the technical scheme of the invention is as follows: a device for treating municipal sewage by using a partial nitrosation-anaerobic ammonia oxidation process is characterized in that: consists of an anaerobic ammonium oxidation bacterium enrichment culture device and a continuous flow PN/A autotrophic biological denitrification device; the anaerobic ammonia oxidation bacteria enrichment culture device comprises a water distribution tank, a liquid medicine barrel, an enrichment culture reactor and a control system, wherein the water distribution tank is connected with a water outlet pool of a sewage treatment plant through a water replenishing pump and a pipeline and is connected with the enrichment culture reactor through a water inlet pump, the liquid medicine barrel is connected with the water distribution tank through a liquid medicine adding pump, the enrichment culture reactor is formed by connecting two chambers added with biological carriers in series according to the water flow direction, and the control system is connected with the water replenishing pump, the liquid medicine adding pump, a liquid level sensor, a temperature controller, the water inlet pump and a heater; the continuous flow PN/A autotrophic biological denitrification device comprises a water inlet pump, a PN/A reactor, a sedimentation tank, a sludge reflux pump and a sludge discharge pump; the municipal sewage that the carbon removal pretreatment was passed through in the intake pump extraction, aeration equipment is established to PN/A reactor bottom, and its trachea is connected with the air-blower, and the import and the intake pump of PN/A reactor are connected, and the export of PN/A reactor and the access connection of sedimentation tank, the mud pipe of sedimentation tank bottom links to each other with mud pump and mud backwash pump respectively, and the pipeline that mud pipe and mud backwash pump link to each other is connected to on the pipeline that intake pump and PN/A reactor are connected.
The stirrer is added into the two chambers of the enrichment culture reactor.
The outlet of the enrichment culture reactor is provided with a porous sieve plate for intercepting the biological carrier.
The enrichment culture reactor is externally provided with a water bath jacket, and the inlet and the outlet of the water bath jacket are connected with a hot water circulating pump and a heater.
The biological carrier adopts a light plastic biological carrier, and the specific surface area is as follows: 500-1000m
2/m
3。
A liquid level sensor is arranged in the water distribution tank.
A temperature sensor is arranged in the enrichment culture reactor.
The outlet of the PN/A reactor is provided with a porous sieve plate to intercept the biological carrier and is connected with a sedimentation tank.
The method for the device for treating the municipal sewage by using the partial nitrosation-anaerobic ammonia oxidation process comprises the following steps:
① enrichment culture of anaerobic ammonium-oxygen bacteria carrier biomembrane comprises adding light plastic biological carrier into enrichment culture reactor, inoculating anaerobic ammonium oxidation strain or common sludge of municipal sewage plant, preparing ammonium chloride or ammonium sulfate and sodium nitrite solution in liquid medicine barrel, setting operation time of medicine pump, and controlling initial water inlet total nitrogen load of enrichment culture reactor to 50g/m
3D; when the ammonia nitrogen concentration of the effluent of the enrichment culture reactor (1.3) is lower than 5mg/L, the influent nitrogen load is gradually increased according to the proportion of 10-20%, and the influent nitrogen load is stably operated after being increased each time until the total nitrogen removal rate reaches more than 80%, and then the total nitrogen load of the influent is increased again; when the total nitrogen load of the inlet water reaches 200-
3When the total nitrogen removal rate is maintained to be more than 80 percent, the anaerobic ammonium oxidation bacteria biomembrane carrier is mature in cultivation and can be used for feeding a PN/A reactor;
② inoculating ordinary nitrified sludge of an urban sewage treatment plant in a PN/A reactor (2.1), wherein the concentration of the inoculated sludge is 3000-4000mg/L, influent water is pumped by a water inlet pump, most COD (chemical oxygen demand) of the urban sewage is removed through pretreatment, the hydraulic retention time of the PN/A reactor is controlled to be 3-6 h, an air blower is started for aeration, dissolved oxygen is controlled to be not less than 1.5-2.0 mg/L, a sludge reflux pump is started, the sludge reflux ratio is controlled to be 80-100%, a sludge discharge pump is started, and the sludge age is controlled to be 15-20 days;
③, detecting the concentration of ammonia nitrogen in the effluent of the sedimentation tank at regular time, namely adjusting a blower and an aerator pipe valve when the concentration of the ammonia nitrogen in the effluent of the PN/A reactor is lower than 2mg/L, controlling dissolved oxygen to gradually drop to 0.10-0.25mg/L, dynamically adjusting the flow of a sludge discharge pump according to the concentration of the ammonia nitrogen in the effluent, controlling the sludge age to be 5-15 days, so as to maintain the concentration of the ammonia nitrogen in the effluent of the sedimentation tank to be 5-8mg/L, reducing the sludge discharge when the concentration of the ammonia nitrogen in the effluent is higher than 8mg/L, and improving the sludge discharge when the concentration of the ammonia nitrogen in the effluent is lower than;
④ timed detection of nitrite nitrogen NO in effluent of sedimentation tank
2 -N and nitro-nitrogen NO
3 --N concentration, calculating the nitrite nitrogen accumulation rate
When NAR is more than 30%, taking out the first cell of the anaerobic ammonium oxidation bacteria enrichment culture deviceAdding the mature anaerobic ammonium oxidation bacteria biofilm carrier into a PN/A reactor according to the adding proportion of 25-40% by volume, transferring the carrier in a second grid chamber of the enrichment culture reactor to a first grid chamber, simultaneously adding a fresh carrier into the second grid chamber to continue culturing the anaerobic ammonium oxidation bacteria, maintaining the dissolved oxygen in the PN/A reactor to be stable at 0.10-0.25mg/L, dynamically maintaining the sludge age to be 5-15 days according to the ammonia nitrogen concentration of outlet water, and controlling the ammonia nitrogen concentration of the outlet water to be 1-2 mg/L;
⑤ regularly detecting ammonia nitrogen NH in inlet water and outlet water of PN/A reactor
4 +N and nitro-nitrogen NO
3 --N concentration, calculating the nitrate-nitrogen ratio delta NO generated by removing unit ammonia nitrogen
3 --N/ΔNH
4 +-N：
When Delta NO
3 --N/ΔNH
4 +-N<0.2, maintaining the current operating conditions unchanged; when Delta NO
3 --N/ΔNH
4 +when-N is more than 0.2, 5-10% of the biological carriers in the PN/A reactor are taken out every 7-15 days and exchanged with the same volume of mature carriers in the first grid of the enrichment culture device until delta NO
3 --N/ΔNH
4 +the-N ratio is restored to below 0.2.
Compared with the prior art, the invention has the following technical innovation and advantages:
1. the method adopts the effluent of the urban sewage treatment plant as the raw water for enriching and culturing the anaerobic ammonium oxidation strain, does not need to add various trace nutrient elements, does not need operations such as nitrogen purging and deoxidation and the like, and is suitable for large-scale strain culture;
2. aiming at urban sewage with relatively low ammonia nitrogen concentration, the invention can quickly establish a partial nitrosation/anaerobic ammonia oxidation main flow process autotrophic biological denitrification system by firstly adding activated sludge to culture aerobic ammonia oxidizing bacteria and then adding mature anaerobic ammonia oxidizing bacteria biological carriers and combining dissolved oxygen control and sludge discharge control;
3. the anaerobic ammonia oxidation bacteria enrichment culture device and the PN/A autotroph denitrification device are matched with each other, and when NOB inhibition is poor in the PN/A autotroph denitrification device, the anaerobic ammonia oxidation activity in the PN/A reactor is improved by interchanging carriers, so that the stable and efficient full-process autotroph denitrification effect is achieved.
Drawings
FIG. 1 is a schematic diagram of an apparatus for treating municipal sewage using a partial nitrosation-anammox process in accordance with the present invention.
In the figure: 1 is anaerobic ammonium oxidation bacterium enrichment breeding device, includes: 1.1-distribution pool; 1.2-medicine liquid barrel; 1.3-enrichment culture reactor; 1.4-control system; 1.5-water replenishing pump; 1.6-dosing pump; 1.7-water inlet pump; 1.8-water bath jacket; 1.9-hot water circulating pump; 1.10-heaters; 1.11-liquid level sensor; 1.12-temperature sensor. 2 is a PN/a autotrophic biological nitrogen removal device, comprising: 2.1-PN/A reactor; 2.2-a sedimentation tank; 2.3-blower; 2.4-water inlet pump; 2.5-sludge reflux pump; 2.6-mud pump.
Detailed Description
The following description of the embodiments of the present invention is provided in conjunction with the accompanying drawings:
a device for treating urban sewage by using a partial nitrosation-anaerobic ammonia oxidation process comprises an anaerobic ammonia oxidation bacteria enrichment culture device and a continuous flow PN/A autotrophic biological denitrification device. The anaerobic ammonium oxidation bacteria enrichment culture device is prepared from local materials, and the carrier biomembrane with anaerobic ammonium oxidation activity is enriched and cultured by utilizing the effluent of the municipal sewage treatment plant; firstly inoculating common nitrified sludge in a PN/A autotrophic biological denitrification device, gradually increasing the AOB activity through a proper control strategy, then putting an anaerobic ammonia oxidation carrier biomembrane with higher activity in an enrichment culture device into the PN/A biological denitrification device, and quickly establishing a stable partial nitrosation/anaerobic ammonia oxidation autotrophic biological denitrification system through a 'sludge-first-membrane-later' starting mode.
The anaerobic ammonia oxidizing bacteria enrichment culture device (1) comprises a water distribution tank (1.1), a liquid medicine barrel (1.2), an enrichment culture reactor (1.3) and a control system. The water distribution tank (1.1) is connected with a water outlet pool of a sewage treatment plant through a water replenishing pump (1.5) and a pipeline, and is connected with an inlet of the enrichment culture reactor (1.3) through a water inlet pump (1.7), and the liquid medicine barrel (1.2) is connected with the water distribution tank (1.1) through a medicine adding pump (1.6). The enrichment culture reactor (1.3) is divided into two chambers connected in series according to the water flow direction, biological carriers are added into the two chambers, fluidization of the carriers is kept through a mechanical stirrer, a porous sieve plate is arranged at the outlet of the enrichment culture reactor to intercept the biological carriers, a water bath jacket (1.8) is arranged outside the enrichment culture reactor (1.3), and the inlet and the outlet of the water bath jacket are connected with a hot water circulating pump (1.9) and a heater (1.10).
Light plastic biological carriers are respectively added into two cells connected in series of the enrichment culture reactor to serve as carriers for attachment growth of the anammox bacteria, and the anammox bacteria cultured in a laboratory are inoculated or the common sludge of a municipal sewage treatment plant is directly inoculated. The first grid chamber close to the water inlet is in a relatively high-load state, and the growth rate of the anaerobic ammonia oxidizing bacteria is higher. When the carrier in the first cell is taken out, the carrier in the second cell is moved into the first cell, and simultaneously, fresh carrier is added into the second cell, so that continuous cultivation is facilitated.
The control system is connected with the water replenishing pump, the dosing pump, the liquid level sensor, the temperature controller, the water inlet pump and the heater.
The control system has three functions: 1) the water distribution function, when the water distribution tank liquid level is less than the preset minimum value, start the water distribution procedure: starting a water replenishing pump to pump the effluent of the sewage treatment plant, and simultaneously starting a dosing pump, wherein the dosing concentration is controlled by the operation time of the dosing pump in a set automatic control program; and stopping the water replenishing pump when the liquid level value of the water distribution tank reaches the preset highest liquid level. 2) Water inlet procedure: starting a water inlet program after water distribution is finished: starting a water inlet pump, feeding water into the enrichment cultivation device according to a set flow, stopping a water inlet program when the liquid level in the water distribution tank reaches a preset minimum value, and transferring to a water distribution program. 3) Temperature control function: the heater is controlled according to the numerical value of the temperature sensor in the reactor, and hot water circulates in the water bath jacket through the circulating pump, so that the temperature in the reactor is ensured to be stabilized at 32 +/-2 ℃.
The invention adopts the effluent (secondary treatment effluent or advanced treatment effluent) of an urban sewage treatment plant as the raw water of the anaerobic ammonia oxidation bacteria enrichment culture device, the raw water enters the water distribution tank, ammonia nitrogen and nitrite nitrogen are added in the water distribution tank as the substrates for culturing the anaerobic ammonia oxidation bacteria, and other trace elements are not added. The ammonia nitrogen and the nitrite nitrogen are provided by ammonium chloride (or ammonium sulfate) and sodium nitrite solution which are regularly prepared in a liquid medicine barrel.
The continuous flow PN/A autotrophic biological denitrification device comprises a water inlet pump (2.4), a PN/A reactor (2.1), a sedimentation tank (2.2), a sludge reflux pump (2.5) and a sludge discharge pump (2.6). The water inlet pump (2.4) is used for pumping the municipal sewage which is subjected to the carbon removal pretreatment. The bottom of the PN/A reactor (2.1) is provided with an aeration device, an air pipe of the aeration device is connected with an air blower (2.3), an inlet of the PN/A reactor (2.1) is connected with a water inlet pump, and an outlet of the PN/A reactor (2.1) is connected with an inlet of a sedimentation tank. The mud pipe of sedimentation tank (2.2) bottom links to each other with dredge pump (2.6) and mud backwash pump (2.5) respectively, and the pipeline that mud pipe and mud backwash pump (2.5) link to each other is connected to on the pipeline that intake pump and PN/A reactor (2.1) are connected, intake pump (2.4) draw the municipal sewage through decarbonization pretreatment, mix with sedimentation tank (2.2) backward flow mud that mud backwash pump (2.5) draw, with the access connection of PN/A reactor (2.1).
The PN/A reactor is inoculated with 'mature' biological carriers in the ordinary nitrified sludge and anaerobic ammonium oxidation bacteria enrichment and cultivation device of the municipal sewage treatment plant. The inlet water of the PN/A reactor is urban sewage pretreated by removing organic matters, and the COD/TN ratio in the inlet water is less than 2.5-3. Aerobic Ammonia Oxidizing Bacteria (AOB) in the PN/A reactor oxidize part of ammonia nitrogen in the sewage into nitrite nitrogen, and anaerobic ammonia oxidizing bacteria attached to the biological carrier oxidize the rest ammonia nitrogen by using the nitrite nitrogen. By adjusting the aeration quantity, the dissolved oxygen in the reactor is controlled to be stabilized at 0.10-0.25 mg/L. And regulating the sludge discharge pump to control the sludge discharge amount of the suspended sludge and controlling the sludge age to be 5-15 days.
The method for the device for treating the municipal sewage by using the partial nitrosation-anaerobic ammonia oxidation process is realized by the following steps:
a) the enrichment culture reactor (1.3) is charged with a light plastic bio-carrier (specific surface area: 500-1000m
2/m
3) The loading volume ratio of the carrier is 30-60Percent; inoculating anaerobic ammonium oxidation strain cultured in a laboratory or directly inoculating common sludge of an urban sewage treatment plant;
b) ammonium chloride (or ammonium sulfate) and sodium nitrite solution are prepared regularly in a liquid medicine barrel (1.2), the running time of a medicine adding pump (1.6) is set in a water distribution program of a control system (1.4), and the initial water inlet total nitrogen load of an enrichment culture reactor (1.3) is controlled to be 50g/m
3/d；
c) When the ammonia nitrogen concentration of the effluent of the enrichment culture reactor (1.3) is lower than 5mg/L, the flow of a water inlet pump (1.7) is gradually increased or the substrate concentration in a liquid medicine barrel (1.2) is increased by 10-20% to improve the nitrogen load of the influent, and the operation is stabilized after the nitrogen load of the influent is increased each time until the total nitrogen removal rate reaches more than 80%, and then the total nitrogen load of the influent is increased again.
d) According to the above operation mode, the total nitrogen load of the feed water of the enrichment culture reactor (1.3) reaches 200-300g/m after about 90-120 days
3The total nitrogen removal rate is maintained to be more than 80 percent, and the anaerobic ammonium oxidation bacteria biofilm carrier is cultivated and matured and can be used for feeding a PN/A reactor (2.1).
e) Ordinary nitrified sludge of an urban sewage treatment plant is inoculated in a PN/A reactor (2.1) at first, and the concentration of the inoculated sludge is 3000-4000 mg/L. Extracting municipal sewage (the COD/TN ratio is less than 2.5-3) from which most of COD is removed through pretreatment by using a water inlet pump (2.4), and controlling the hydraulic retention time of the PN/A reactor (2.1) to be 3-6 h; starting the blower (2.3) and controlling the dissolved oxygen in the PN/A reactor (2.1) to be not less than 1.5-2.0 mg/L. Starting a sludge reflux pump (2.5), and controlling the sludge reflux ratio to be 80-100%; the sludge pump (2.6) is started, and the sludge age is controlled to be 15-20 days.
f) And (3) detecting the concentration of the ammonia nitrogen in the effluent of the sedimentation tank (2.2) at regular time, adjusting the rotating speed frequency of an air blower (2.3) and the opening degree of a valve on an aeration pipeline after the concentration of the ammonia nitrogen in the effluent is lower than 2mg/L, gradually reducing the aeration flow within 3-5 days, and controlling the dissolved oxygen to gradually reduce to 0.10-0.25 mg/L. Dynamically adjusting the flow of a dredge pump (2.5) according to the ammonia nitrogen concentration of the effluent, controlling the sludge age to be 5-15 days, and maintaining the ammonia nitrogen concentration of the effluent of the sedimentation tank (2.2) to be about 5-8 mg/L: when the ammonia nitrogen in the effluent is higher than 8mg/L, the sludge discharge amount is reduced, and when the ammonia nitrogen in the effluent is lower than 5mg/L, the sludge discharge amount is increased.
g) Timing detection of nitrite Nitrogen (NO) in effluent of sedimentation tank (2.2)
2 --N) and nitro Nitrogen (NO)
3 --N) concentration, calculating the nitrite nitrogen accumulation rate
When NAR is more than 30%, taking out the mature anaerobic ammonium oxidation bacteria biofilm carrier cultured in the first grid chamber of the anaerobic ammonium oxidation bacteria enrichment culture device (1.3), and adding the mature anaerobic ammonium oxidation bacteria biofilm carrier into a PN/A reactor (2.1) at a volume ratio of 25-40%; and transferring the carriers in the second compartment of the enrichment culture reactor (1.3) to the first compartment while adding fresh carriers in the second compartment to continue culturing the anammox bacteria. The dissolved oxygen in the PN/A reactor (2.1) is maintained to be stable at 0.10-0.25mg/L, the sludge age is dynamically maintained for 5-15 days according to the ammonia nitrogen concentration of the effluent, and the ammonia nitrogen concentration of the effluent is controlled to be 1-2 mg/L.
h) Regularly detect the water inlet and outlet ammonia Nitrogen (NH) of the PN/A reactor (2.1)
4 +-N) and nitro Nitrogen (NO)
3 --N) concentration, calculating the ratio of nitrate to nitrogen (Delta NO) produced by removing unit ammonia nitrogen
3 --N/ΔNH
4 +-N)：
When Delta NO
3 --N/ΔNH
4 +-N<0.2, maintaining the current operating conditions unchanged; when Delta NO
3 --N/ΔNH
4 +When N is more than 0.2, 5-10% of the biological carriers in the PN/A reactor (2.1) are taken out every 7-15 days and exchanged with the same volume of mature carriers in the first compartment of the enrichment culture device (1.3) until delta NO is reached
3 --N/ΔNH
4 +the-N ratio is restored to below 0.2.
The technical effect of the present invention will be further explained with reference to specific application examples below:
the first embodiment is as follows: the secondary treatment effluent of a western sewage treatment plant in the Tianjin economic technology development area is used as the inlet water of the enrichment culture device, ammonium chloride and sodium nitrite are added into the inlet water, and the initial ammonia nitrogen and nitrite nitrogen concentration is 20-30 mg/L. The effective volume of the enrichment and cultivation device is 600L,300L of plastic carrier is loaded and 10L of anaerobic ammonium oxidation strain sludge cultivated in a laboratory is inoculated. According to the steps b, c and d, the concentration of the ammonia nitrogen and the nitrite nitrogen of the inlet water is gradually increased to 120mg/L of 100-
2/d。
The second embodiment is as follows: the secondary treatment effluent of a north pond sewage treatment plant in an Tianjin economic technology development area is used as the inlet water of an enrichment culture device, ammonium chloride and sodium nitrite are added into the inlet water, and the initial ammonia nitrogen and nitrite nitrogen concentration is 20-30 mg/L. The effective volume of the enrichment culture device is 1.6m
3700L of plastic carriers are loaded, and mature 70L of anaerobic ammonium oxidation bacteria carriers are cultured in an enrichment culture device of the western sewage treatment plant in the first embodiment. According to the steps b, c and d, after 90 days, the total nitrogen increase of the inlet water is 417.5 +/-29.0 mg/L, the total nitrogen removal rate is 81.8 percent, and the nitrogen removal rate of the surface of the carrier membrane reaches 2.00gN/m
2/d。
The effective volume of the PN/A reactor is 160L, the effluent of the aeration grit chamber of the north pond sewage treatment plant is used for the water inlet of the test, the front-end carbon separation pretreatment is carried out, the COD concentration of the inlet water is 50-120mg/L, and NH is carried out
4 +The concentration of-N is 23-33mg/L, and the concentration of TN is 32-43 mg/L. Inoculating dewatered sludge of a sewage treatment plant, acclimatizing and culturing for 1 month according to the step e), and adding the dewatered sludge into an enrichment culture device according to the steps f and g) to culture mature anaerobic ammonium oxidation bacteria carriers 48L. Test results show that after the biological denitrification process of partial nitrosation/anaerobic ammoxidation main flow process can be established after the biological denitrification process is stably operated for 1 month, the COD concentration of effluent is 20-30mg/L, and NH is added
4 +The concentration of-N is 0.2-2mg/L, and the concentration of TN is 8-12 mg/L.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A device for treating municipal sewage by using a partial nitrosation-anaerobic ammonia oxidation process is characterized in that: consists of an anaerobic ammonium oxidation bacterium enrichment culture device and a continuous flow PN/A autotrophic biological denitrification device; the anaerobic ammonia oxidation bacteria enrichment culture device comprises a water distribution tank, a liquid medicine barrel, an enrichment culture reactor and a control system, wherein the water distribution tank is connected with a water outlet pool of a sewage treatment plant through a water replenishing pump and a pipeline and is connected with the enrichment culture reactor through a water inlet pump, the liquid medicine barrel is connected with the water distribution tank through a liquid medicine adding pump, the enrichment culture reactor is formed by connecting two chambers added with biological carriers in series according to the water flow direction, and the control system is connected with the water replenishing pump, the liquid medicine adding pump, a liquid level sensor, a temperature controller, the water inlet pump and a heater; the continuous flow PN/A autotrophic biological denitrification device comprises a water inlet pump, a PN/A reactor, a sedimentation tank, a sludge reflux pump and a sludge discharge pump; the municipal sewage that the carbon removal pretreatment was passed through in the intake pump extraction, aeration equipment is established to PN/A reactor bottom, and its trachea is connected with the air-blower, and the import and the intake pump of PN/A reactor are connected, and the export of PN/A reactor and the access connection of sedimentation tank, the mud pipe of sedimentation tank bottom links to each other with mud pump and mud backwash pump respectively, and the pipeline that mud pipe and mud backwash pump link to each other is connected to on the pipeline that intake pump and PN/A reactor are connected.
2. The apparatus for treating municipal sewage using a partial nitrosation-anammox process according to claim 1, wherein: the stirrer is added into the two chambers of the enrichment culture reactor.
3. The apparatus for treating municipal sewage using a partial nitrosation-anammox process according to claim 1, wherein: the outlet of the enrichment culture reactor is provided with a porous sieve plate for intercepting the biological carrier.
4. The apparatus for treating municipal sewage using a partial nitrosation-anammox process according to claim 1, wherein: the enrichment culture reactor is externally provided with a water bath jacket, and the inlet and the outlet of the water bath jacket are connected with a hot water circulating pump and a heater.
5. The method of claim 1The device for treating the municipal sewage by using the partial nitrosation-anaerobic ammonia oxidation process is characterized in that: the biological carrier adopts a light plastic biological carrier, and the specific surface area is as follows: 500-1000m
2/m
3。
6. The apparatus for treating municipal sewage using a partial nitrosation-anammox process according to claim 1, wherein: a liquid level sensor is arranged in the water distribution tank.
7. The apparatus for treating municipal sewage using a partial nitrosation-anammox process according to claim 1, wherein: a temperature sensor is arranged in the enrichment culture reactor.
8. The apparatus for treating municipal sewage using a partial nitrosation-anammox process according to claim 1, wherein: the outlet of the PN/A reactor is provided with a porous sieve plate to intercept the biological carrier and is connected with a sedimentation tank.
9. A method for an apparatus for treating municipal sewage using a partial nitrosation-anammox process according to claim 1, comprising the steps of:
① enrichment culture of anaerobic ammonium-oxygen bacteria carrier biomembrane comprises adding light plastic biological carrier into enrichment culture reactor, inoculating anaerobic ammonium oxidation strain or common sludge of municipal sewage plant, preparing ammonium chloride or ammonium sulfate and sodium nitrite solution in liquid medicine barrel, setting operation time of medicine pump, and controlling initial water inlet total nitrogen load of enrichment culture reactor to 50g/m
3D; when the ammonia nitrogen concentration of the effluent of the enrichment culture reactor (1.3) is lower than 5mg/L, the influent nitrogen load is gradually increased according to the proportion of 10-20%, and the influent nitrogen load is stably operated after being increased each time until the total nitrogen removal rate reaches more than 80%, and then the total nitrogen load of the influent is increased again; when the total nitrogen load of the inlet water reaches 200-
3When the total nitrogen removal rate is maintained to be more than 80 percent, the anaerobic ammonium oxidation bacteria biomembrane carrier is mature in cultivation and can be used for feeding a PN/A reactor;
② inoculating ordinary nitrified sludge of an urban sewage treatment plant in a PN/A reactor (2.1), wherein the concentration of the inoculated sludge is 3000-4000mg/L, influent water is pumped by a water inlet pump, most COD (chemical oxygen demand) of the urban sewage is removed through pretreatment, the hydraulic retention time of the PN/A reactor is controlled to be 3-6 h, an air blower is started for aeration, dissolved oxygen is controlled to be not less than 1.5-2.0 mg/L, a sludge reflux pump is started, the sludge reflux ratio is controlled to be 80-100%, a sludge discharge pump is started, and the sludge age is controlled to be 15-20 days;
③, detecting the concentration of ammonia nitrogen in the effluent of the sedimentation tank at regular time, namely adjusting a blower and an aerator pipe valve when the concentration of the ammonia nitrogen in the effluent of the PN/A reactor is lower than 2mg/L, controlling dissolved oxygen to gradually drop to 0.10-0.25mg/L, dynamically adjusting the flow of a sludge discharge pump according to the concentration of the ammonia nitrogen in the effluent, controlling the sludge age to be 5-15 days, so as to maintain the concentration of the ammonia nitrogen in the effluent of the sedimentation tank to be 5-8mg/L, reducing the sludge discharge when the concentration of the ammonia nitrogen in the effluent is higher than 8mg/L, and improving the sludge discharge when the concentration of the ammonia nitrogen in the effluent is lower than;
④ timed detection of nitrite nitrogen NO in effluent of sedimentation tank
2 -N and nitro-nitrogen NO
3 --N concentration, calculating the nitrite nitrogen accumulation rate
When NAR is more than 30%, taking out a mature anaerobic ammonium oxidation bacteria biofilm carrier cultured in a first grid chamber of an anaerobic ammonium oxidation bacteria enrichment culture device, adding the mature anaerobic ammonium oxidation bacteria biofilm carrier into a PN/A reactor, wherein the adding proportion is 25-40% of the volume ratio, transferring the carrier in a second grid chamber of the enrichment culture reactor to the first grid chamber, simultaneously adding a fresh carrier into the second grid chamber to continuously culture anaerobic ammonium oxidation bacteria, maintaining the dissolved oxygen in the PN/A reactor to be stable at 0.10-0.25mg/L, dynamically maintaining the sludge age to be 5-15 days according to the ammonia nitrogen concentration of outlet water, and controlling the ammonia nitrogen concentration of the outlet water to be 1-2 mg/L;
⑤ regularly detecting ammonia nitrogen NH in inlet water and outlet water of PN/A reactor
4 +N and nitro-nitrogen NO
3 --N concentration, calculating the nitrate-nitrogen ratio delta NO generated by removing unit ammonia nitrogen
3 --N/ΔNH
4 +-N：
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