CN116874077B - Integrated short-cut nitrification-anaerobic ammoxidation reaction system and reaction process - Google Patents
Integrated short-cut nitrification-anaerobic ammoxidation reaction system and reaction process Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 152
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 238000004062 sedimentation Methods 0.000 claims abstract description 80
- 238000007872 degassing Methods 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000007599 discharging Methods 0.000 claims abstract description 20
- 230000000630 rising effect Effects 0.000 claims abstract description 15
- 239000010802 sludge Substances 0.000 claims description 94
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 86
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 52
- 229910021529 ammonia Inorganic materials 0.000 claims description 43
- 238000007254 oxidation reaction Methods 0.000 claims description 42
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims description 26
- 238000005273 aeration Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 24
- 239000010865 sewage Substances 0.000 claims description 20
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 16
- 238000000926 separation method Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 230000003647 oxidation Effects 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 8
- 238000012806 monitoring device Methods 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 10
- 230000033228 biological regulation Effects 0.000 abstract description 4
- 241001453382 Nitrosomonadales Species 0.000 description 74
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 11
- 238000005842 biochemical reaction Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 6
- 238000005191 phase separation Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XKLJHFLUAHKGGU-UHFFFAOYSA-N nitrous amide Chemical compound ON=N XKLJHFLUAHKGGU-UHFFFAOYSA-N 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004065 wastewater treatment 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
- C02F3/28—Anaerobic digestion processes
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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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 invention provides an integrated short-cut nitrification-anaerobic ammoxidation reaction system and a reaction process. The reaction system comprises a reaction tank, a control unit, a water outlet module, a quality-dividing mud discharging module and a degassing module, wherein the water outlet module, the quality-dividing mud discharging module and the degassing module are arranged in the reaction tank, a circulating sedimentation zone is formed in the reaction tank, the rising flow rate of mixed liquid in the circulating sedimentation zone is regulated by the quality-dividing mud discharging module under the regulation and control of the control unit, so that a primary sedimentation zone and a secondary sedimentation zone are formed in the circulating sedimentation zone, and the primary sedimentation zone is positioned above the secondary sedimentation zone.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an integrated short-cut nitrification-anaerobic ammonia oxidation reaction system and a reaction process.
Background
The treatment of high ammonia nitrogen wastewater has been one of the key research directions in the field of industrial wastewater treatment, and an anaerobic ammonia oxidation (Anaerobic ammonium oxidation, anammox) process is used to perform denitrification treatment on the high ammonia nitrogen wastewater, and under the anoxic condition, ammonia is used as an electron donor, and nitrous nitrogen is used as an electron acceptor to oxidize ammonia into nitrogen. The short-cut nitrification-anaerobic ammonia oxidation (PN/A) process derived on the basis can realize autotrophic denitrification under the condition of no carbon source, saves aeration energy consumption by 60%, and is a promising high-efficiency biological denitrification process.
At present, the short-cut nitrification-anaerobic ammonia oxidation process is mainly divided into two-stage type and one-stage type. In the two-stage short-cut nitrification-anaerobic ammonia oxidation reaction process, two reactors with different running conditions are usually required in the high ammonia nitrogen water treatment process, and short-cut nitrification and anaerobic ammonia oxidation are respectively carried out. For example, chinese patent application with publication number CN116282528A, which is provided with a short-cut nitrification tank and an anaerobic ammonia oxidation tank, sewage pumped into the system enters the short-cut nitrification tank first, under the condition of oxygen supply, ammonia Oxidizing Bacteria (AOB) converts a part of ammonia nitrogen in the water into nitrite nitrogen, the nitrite nitrogen and the rest ammonia nitrogen enter the anaerobic ammonia oxidation tank together, and under the action of the anaerobic ammonia oxidizing bacteria (AnAOB), ammonia nitrogen and nitrite nitrogen are converted into nitrogen, thereby realizing biological denitrification.
The one-stage short-cut nitrification-anaerobic ammoxidation process is to perform short-cut nitrification and anaerobic ammoxidation in one reactor simultaneously and realize the denitrification treatment of sewage through the combined action of AOB and AnAOB. An integrated short-cut nitrification-anaerobic ammonia oxidation sewage treatment domestication device provided in chinese patent application publication No. CN109987703a, for example, adopts an intermittent step aeration operation mode in one reactor, and implements sewage denitrification treatment and microorganism domestication in a reaction mode of multistage aerobic/anoxic alternate operation.
In the prior one-stage process, two bacteria, namely AOB and AnAOB, play an important role together, the AOB performs a short-range nitrification function, ammonia nitrogen is converted into nitrosamine, and the AnAOB converts the ammonia nitrogen and the nitrosamine into nitrogen, thereby performing a denitrification function. Therefore, the biomass stabilization of AnAOB and AOB is a key factor for realizing efficient denitrification and stable operation of PN/A. But AOB grows relatively fast, with doubling times typically around 10 days, while AnAOB grows very slowly, with doubling times typically between 20 and 30 days. The problem of the one-stage process is that more short-cut nitrification can occur when the AOB grows faster than the AnAOB, ammonia nitrogen is converted into nitrous nitrogen, and if the nitrous nitrogen is not consumed by the AnAOB, the AnAOB can be inhibited, and the system stability is affected; on the other hand, nitrogen generated by the biochemical reaction drives sludge to float upwards, and AnAOB in the sludge is discharged and lost along with effluent, so that the biomass of AnAOB is reduced, and the short-range nitrification and anaerobic ammonia oxidation reactions are unbalanced; the resulting nitrous nitrogen is continuously accumulated, and thus has an inhibitory effect on AnAOB, eventually leading to a breakdown of the whole system.
In addition, in the existing one-stage process, the short-cut nitrification reaction and the anaerobic ammonia oxidation reaction are carried out by adopting sequencing batch reaction, and water inlet and water outlet are required to be stopped in the reaction process, so that the whole denitrification process is discontinuous, the system state is not easy to keep stable, the time is increased, and the reaction benefit is reduced.
Accordingly, it is desirable to provide a system and method that enables a one-stage short-cut nitrification-anaerobic ammonia oxidation reaction system to be operated stably and continuously.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an integrated shortcut nitrification-anaerobic ammonia oxidation reaction system and a reaction process; the aeration can be automatically regulated according to the water quality condition in the reaction tank, the oxygen supply and the short-cut nitrification reaction progress are controlled, the coupling of biochemical reaction and precipitation separation can be realized through the quality-dividing sludge discharge, degassing and water discharge module, and the continuous operation efficiency is greatly improved, wherein the quality-dividing sludge discharge module can regulate the sludge proportion of the AOB and the AnAOB in the reaction tank through the quality-dividing sludge discharge, and the degassing module can better intercept the AnAOB, so that the long-term continuous and stable operation of the short-cut nitrification and the anaerobic ammonia oxidation in the reaction tank is realized.
The invention provides an integrated short-cut nitrification-anaerobic ammoxidation reaction system, which comprises a reaction tank, a control unit, a water outlet module, a quality-dividing sludge discharge module and a degassing module, wherein the water outlet module, the quality-dividing sludge discharge module and the degassing module are arranged in the reaction tank, a circulation sedimentation zone is formed in the reaction tank, and the control unit regulates the rising flow rate of mixed liquor in the circulation sedimentation zone through the quality-dividing sludge discharge module so as to form a primary sedimentation zone and a secondary sedimentation zone in the circulation sedimentation zone, wherein the primary sedimentation zone is positioned above the secondary sedimentation zone.
Further, the split sludge discharge module comprises: a mud discharge pipe, a collecting part, a return pipe and a return pump, wherein
One end of the mud discharging pipe is communicated with the primary sedimentation area, the other end of the mud discharging pipe is communicated with the collecting part, one end of the return pipe is communicated to the clear liquid area of the collecting part, the other end of the return pipe is communicated to the secondary sedimentation area, and the return pump is arranged in the return pipe.
Further, the degassing module comprises a first degassing part and a second degassing part which are sequentially arranged from top to bottom; the water outlet module is arranged at one side of the first degassing part far away from the inner wall of the reaction tank; a downward flow channel is formed between the degassing module and the inner wall of the reaction tank, an upward flow channel is formed in a space of the second degassing part on one side of the water outlet module, and gas is discharged through the first degassing part; wherein the method comprises the steps of
The loop settling zone is located below the degassing module.
Further, the water outlet module comprises a water discharge weir and a water outlet pipe, wherein the water discharge weir is arranged at the central position of the top of the reaction tank, one end of the water outlet pipe is arranged at the bottom of the water discharge weir, and the other end of the water outlet pipe penetrates through the side wall of the reaction tank to be communicated with the outside.
Further, the control unit includes:
the aeration device comprises an aeration pipe arranged at the lower part of the reaction tank and a fan communicated with the aeration pipe;
the monitoring device comprises a sludge concentration monitor, a nitrous nitrogen concentration monitor, an ammonia nitrogen concentration monitor, a pH value monitor, a temperature monitor and a dissolved oxygen monitor which are arranged in the reaction tank; and a pH value adjusting device and a temperature adjusting device.
Further, the reaction system further comprises a master controller and a control circuit, and the control unit, the water outlet module and the quality-dividing mud discharging module are electrically connected with the master controller through the control circuit.
According to a second aspect of the present invention there is provided an integrated shortcut nitrification-anaerobic ammonia oxidation reaction process, said reaction process comprising the steps of:
step S1, pumping sewage to be treated into an integrated shortcut nitrification-anaerobic ammonia oxidation reaction tank;
s2, starting a control unit, so that a short-cut nitrification-anaerobic ammoxidation reaction is started, and keeping the system to stably run through the control unit;
and S3, when the sludge concentration is detected to exceed the preset value range, carrying out quality-classifying and sludge discharge on the reaction tank.
Further, the step S3 of separating the reaction tank into quality and discharging sludge includes:
s3-1, forming a circulating sedimentation zone in the reaction tank, and enabling the circulating sedimentation zone to be divided into a primary sedimentation zone and a secondary sedimentation zone by adjusting the rising flow rate, wherein the secondary sedimentation zone is positioned below the primary sedimentation zone;
s3-2, discharging sludge in the primary sedimentation zone through a sludge discharge pipe;
s3-3, carrying out secondary sedimentation on the sludge discharged in the step S3-2 in a collecting part, and refluxing clear liquid in a clear liquid zone of the collecting part into the secondary sedimentation zone in the reaction tank;
and step S3-4, adjusting the rising flow rate in the reaction tank by adjusting the reflux rate of the clear liquid.
Further, the preset value range of the sludge concentration in the step S3 is: the ratio of AOB to AnAOB is in the range of 1:1 to 3:1.
Further, the maintaining the stable system operation in step S2 by the control unit further includes: controlling the short-cut nitrification reaction and the anaerobic ammoxidation reaction simultaneously by controlling the aeration amount while controlling the concentration of ammonia nitrogen to be in a range higher than 20mg/L, the concentration of nitrous nitrogen to be in a range lower than 50mg/L, and the concentration of dissolved oxygen to be in a range not more than 0.5 mg/L; and in the step S2, the pH value is controlled to be in the range of 6.5-8.3.
The invention provides an integrated short-cut nitrification-anaerobic ammoxidation reaction system and a reaction process. The reaction system integrates the short-cut nitrification-anaerobic ammoxidation biochemical reaction and the solid-liquid-gas three-phase separation, automatically monitors the ammonia nitrogen concentration, the nitrite nitrogen concentration, the pH value and the dissolved oxygen concentration in the reaction tank through the monitoring module, controls the aeration frequency of the aeration device, adjusts the concentration of the dissolved oxygen in the reaction tank, stabilizes the ammonia nitrogen and the nitrite nitrogen concentration in the reaction tank, ensures that the biochemical reaction in the reaction tank is stably carried out, can realize the simultaneous carrying out of the short-cut nitrification reaction and the anaerobic ammoxidation reaction, and does not need to stop the water inlet and outlet of the reaction tank in the reaction process, thereby ensuring the continuous operation of the system. The system provided by the invention is simple, easy to apply and convenient to overhaul.
The short-cut nitrification-anaerobic ammonia oxidation reaction system provided by the invention can realize the regulation and control of the proportion of AOB and AnAOB, namely the realization of quality-divided sludge discharge. Due to the slow settling rate of AOB, it is usually present in the system in the form of flocculent sludge, whereas AnAOB is easily granulated and the settling rate is fast, usually in the form of granular sludge. Thus, the AOB can be selectively discharged according to the sedimentation property difference of the two bacteria, and the AnAOB is reserved in the reaction tank, so that the sludge ratio in the system is regulated and controlled. From this, this application has set up the matter-division mud module in particular, can control and regulate and control the proportion of different mud in the reaction tank, avoid because AOB increases faster the growth that produces too much nitrite nitrogen and restrain AnAOB leads to system's denitrification performance to reduce, guarantees the biochemical reaction steady operation in the reaction tank.
In addition, the system is provided with the degassing module, so that three-phase separation can be realized, and a great deal of loss caused by the fact that part of AnAOB is discharged along with water due to the fact that air floatation is generated when air rises after ammonia nitrogen and nitrite nitrogen are converted into nitrogen is avoided. The denitrification efficiency of the integrated short-cut nitrification-anaerobic ammonia oxidation reaction system provided by the invention is close to the highest theoretical removal rate of 89%.
The integrated shortcut nitrification-anaerobic ammonia oxidation reaction process provided by the invention is simple to operate, and can realize automatic adjustment of aeration quantity, so that the shortcut nitrification reaction and the anaerobic ammonia oxidation reaction are carried out simultaneously, and a quality-separation mud-discharging process is carried out according to monitoring data, so that manual operation is not needed, the stability of water inflow and water outflow is ensured, and the ammonia nitrogen removal rate can be improved.
Drawings
FIG. 1 is a perspective view of an integrated short-cut nitrification-anaerobic ammonia oxidation reaction system according to the present invention.
FIG. 2 is a side perspective view of an integrated short-cut nitrification-anaerobic ammonia oxidation reaction system according to the present invention.
FIG. 3 is a schematic front view of an integrated short-cut nitrification-anaerobic ammonia oxidation reaction system according to the present invention.
Fig. 4 is a schematic view of a flow path generated due to the provision of a deaerator in a reaction tank of an integrated shortcut nitrification-anaerobic ammonia oxidation reaction system according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. The principles and features of the present invention are described below with reference to the drawings, and it should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The illustrated embodiments are merely illustrative of the invention and are not intended to limit the scope of the invention.
The first aspect of the present invention provides an integrated shortcut nitrification-anaerobic ammonia oxidation reaction system 10, as shown in fig. 1, the reaction system 10 includes a reaction tank 100 and a control unit (not shown), and a water outlet module 200, a differential sludge discharge module 300 and a degassing module 400 disposed in the reaction tank 100, a circulation settling zone 102 is formed in the reaction tank 100, and the differential sludge discharge module 300 forms a primary settling zone 1021 and a secondary settling zone 1022 in the circulation settling zone 102 by adjusting an ascending flow rate of a mixed liquid in the circulation settling zone 102, wherein the primary settling zone 1021 is located above the secondary settling zone 1022.
The reaction system 10 of the present invention can realize efficient sewage denitrification treatment, as shown in fig. 3, the reaction tank 100 may be provided with a water inlet 101 or provided with a water inlet pipe (not shown), etc., fig. 3 shows a schematic diagram of the reaction tank 100 provided with the water inlet 101, after sewage is discharged into the reaction tank 100, ammonia nitrogen in the sewage can be reacted by an AOB in the reaction tank 100 to generate nitrous nitrogen through adjustment of a control unit, and the generated nitrous nitrogen and the remaining ammonia nitrogen are reacted by the AnAOB to generate nitrogen, thereby realizing denitrification without adding carbon sources in the whole process, and saving operation cost and resources. Under the action of the control unit, the short-range nitrification reaction and the anaerobic ammonia oxidation reaction can be performed simultaneously, the staged performance is not needed, water inlet and water outlet are not needed to be stopped in the reaction process, and the method is efficient and energy-saving.
Further, since the reaction system 10 of the present invention is provided with the mass-separation mud-discharging module 300, when the growth rate of the AOB is too fast, resulting in an increase in the amount of the AOB and the generated nitrous nitrogen is likely to inhibit the growth of the anaaob and affect the anaerobic ammoxidation reaction, the flocculent AOB is discharged out of the reaction tank 100 through the mass-separation mud-discharging module 300, and the anaaob in the reaction tank 100 is retained, thereby regulating the ratio of the AOB to the AnAOB, and ensuring the stable operation of the biochemical reaction of the system. Further, as the final product of denitrification is nitrogen, an air floatation phenomenon may be generated in the process of floating up nitrogen from liquid, and part of AnAOB is driven to rise, so that AnAOB is lost along with water discharge.
The specific structure of the differential sludge discharging module 300 and the degassing module 400 according to the present invention will be described in detail.
In some embodiments of the present invention, as shown in fig. 3, the split sludge discharge module 300 includes a sludge discharge pipe 301, a collecting portion 302, a return pipe 303, and a return pump 304, one end of the sludge discharge pipe 301 is communicated with a primary sedimentation zone 1021, the other end is communicated with the collecting portion 302, one end of the return pipe 303 is communicated with a clear liquid storage portion of the collecting portion 302, the other end is communicated with a secondary sedimentation zone 1022 of the reaction tank, and the return pump 304 may be provided in the return pipe 303 or in the collecting portion as long as the return flow can be provided.
Specifically, one end of the sludge discharge pipe 301 communicates with the primary sedimentation zone 1021, and the other end communicates with the collecting portion 302, so that at the start of sludge discharge, the sludge discharge pipe 301 can discharge only sludge in the primary sedimentation zone 1021 while retaining sludge in the secondary sedimentation zone 1022. The sludge discharged through the sludge discharge pipe 301 enters the collecting part 302, secondary sedimentation is carried out in the collecting part 302, sludge and water after secondary sedimentation are separated to form a sludge area 3021 and a clear liquid area 3022, clear liquid in the clear liquid area 3022 flows back to the secondary sedimentation area 1022 in the reaction tank 100 through the backflow pipe 303, on one hand, the sludge discharge operation of the sludge discharge pipe 301 can be realized, on the other hand, the adjustment of the rising flow speed in the circulation sedimentation area 102 can be realized, other adjusting devices are avoided being additionally arranged, the quality-divided discharge of the sludge in the reaction tank 100 can be realized, the proportion of the sludge is regulated and controlled, the quality-divided sludge discharge is realized, the sewage treatment cost is reduced, and the stable operation of a system is ensured.
It should be appreciated that during the initial period of starting up the split sludge discharge module 300, since the rising flow rate is not specifically controlled, mixed sludge may be discharged, and at this time, mixed sludge may be discharged again into the reaction tank 100 due to difficulty in secondary sedimentation, and loss of AnAOB may not be caused, while when the rising flow rate is regulated smoothly, and the rising flow rate is regulated very rapidly, the settling rate of AOB sludge in water is slow, so that flocculent sludge is formed into the primary sedimentation zone 1021, and AnAOB sludge is formed into granular sludge into the secondary sedimentation zone 1022 due to fast settling rate, at this time, AOB in the primary sedimentation zone 1021 is stably output, and AnAOB at the bottom is not discharged again, so that AOB may be rapidly secondarily sedimented in the collecting portion 302, and thus clear liquid may not be returned into the reaction tank 100.
When the reaction period is long, in the case that the content of both AOB and AnAOB is high in the reaction tank 100, at this time, not only AOB but also a certain amount of AnAOB needs to be discharged, therefore, in some preferred embodiments, the split-type sludge discharge module 300 of the present invention further includes a second collecting portion, a second sludge discharge pipe, one end of which is in communication with the secondary sedimentation region 1022, and the other end of which is in communication with the second collecting portion, and a sludge discharge pump, which is disposed in the second sludge discharge pipe, so that the AnAOB in the secondary sedimentation region 1022 is discharged into the second collecting portion, and the AnAOB discharged into the second collecting portion can be reserved for use of inoculated sludge in the subsequent new reaction system 10 establishment process, and also can be subjected to innocuous treatment without secondary sedimentation.
Further, the above-described collecting section 302 (including the above-described collecting section and the second collecting section) of the present invention may be provided as a small secondary sedimentation tank, sludge-water separation tank, or the like, or may be provided as a general reservoir, and a sludge interception device may be added thereto, so that sludge-water separation can be achieved while water is fed, and sludge and clear liquid are separated to form a clear liquid section 3022 which is separated, and the present invention is not particularly limited as long as secondary sedimentation of AOB can be achieved.
Further, as described above, in order to avoid the influence of the particulate AnAOB carried over from the air-floating phenomenon on the quality-divided sludge discharging effect, the present invention is particularly provided with the degassing module 400. Specifically, as shown in fig. 4, the degassing module 400 includes a first degassing part 401 and a second degassing part 402 which are sequentially arranged from top to bottom, and the degassing modules 400 are preferably arranged in two groups and are oppositely arranged in the present embodiment; the water outlet module 200 is arranged between the two first deaeration sections 401; a downward flow channel is formed between the degassing module 400 and the inner wall of the reaction tank 100, an upward flow channel is formed in a space of the second degassing part 402 toward the water outlet module 200 side, and the gas is discharged through the first degassing part 401.
In case a degassing module 400 is provided, the loop sedimentation zone 102 is located below the degassing module 400, in particular below the second degassing section 402. Thus, the sludge is separated under the degassing module 400, and the rising flow rate may directly form an upward flow path between the stripping blocks, and the gas generated thereby may be directly discharged through the upward flow path along the rising flow rate. Further realizes three-phase separation, improves economic benefit and achieves multiple purposes.
The reaction system 10 of the present invention can realize the comprehensive functions of sludge-water separation, sludge-separation (regulation of sludge ratio), three-phase separation (gas discharge and no sludge to be retained) and the like on the premise of performing the short-cut nitrification-anaerobic ammoxidation reaction in one reaction tank 100 under the action of the above-mentioned sludge-separation module 300 and the degassing module 400, and has high economic benefit, simple maintenance and easy regulation.
The other modules of the reaction system 10 of the present invention will be described in detail below.
Further, in some embodiments, as shown in fig. 1 and 2, the water outlet module 200 of the present invention includes a water discharge weir 201 and a water outlet pipe 202, wherein the water discharge weir 201 is disposed at a central position of the top of the reaction tank 100, and when the mud-water separation is performed in the reaction tank 100, the water is automatically discharged when the liquid level of the supernatant reaches the top of the water discharge weir 201. One end of the water outlet pipe 202 is arranged at the bottom of the water outlet weir 201, and the other end of the water outlet pipe passes through the side wall of the reaction tank 100 to be communicated with the outside. In the process of the deamination reaction, the reacted sludge is separated from the liquid, the separated liquid flows out from the water discharge weir 201 through the water outlet pipe 202, and the sludge is precipitated below the reaction tank 100. In a preferred embodiment, a water discharge weir 201 is provided along the length of the reaction tank 100 to increase the amount of water discharged, avoiding overflow; and the joint between the water outlet pipe 202 and the side wall of the reaction tank 100 is sealed by a sealing device, so as to prevent the occurrence of liquid leakage.
In some embodiments of the invention, the control unit comprises an aeration device, a monitoring device, a ph adjustment device, and a temperature adjustment device. Specifically, the aeration device includes an aeration pipe 501 provided at the lower portion of the reaction tank 100 and a blower in communication with the aeration pipe 501. The aeration pipe 501 is communicated below the reaction tank 100, preferably, a fan may be arranged outside the reaction tank 100 or directly connected with an external air supply system, so that the aeration amount can be controlled by adjusting and controlling the flow rate of air flow blown into the reaction tank 100, and the content of dissolved oxygen in the reaction tank 100 can be adjusted.
Further, the monitoring device comprises a sludge concentration detector, a nitrous nitrogen concentration detector, an ammonia nitrogen concentration detector, a PH value detector, a temperature detector and a dissolved oxygen detector which are arranged in the reaction tank 100, wherein the sludge concentration detector can monitor the contents of AOB and AnAOB in the reaction tank 100 and the proportion of the two types of sludge; other monitoring devices can monitor various factors such as the concentration of nitrous nitrogen, the concentration of ammonia nitrogen, the pH value, the temperature and the concentration of dissolved oxygen in the water inlet and the reaction process in the reaction tank 100. As described above, the control unit of the present invention further includes the ph adjusting means and the temperature adjusting means, that is, the ph and the temperature in the reaction tank 100 can be adjusted when the monitoring means detects that the ph and the temperature are changed. The ph adjusting device may be, for example, a container provided with a pumping device, and the container is filled with a buffer solution, so that the ph is adjusted by pumping the buffer solution, and the temperature adjusting device may be, for example, a fan or a device for refrigerating or heating such as a resistance wire, and the present application is not particularly limited.
In some preferred embodiments of the present invention, the reaction system 10 further includes a general controller and a control circuit, wherein the general controller is generally disposed at a location convenient for a person to operate, for example, near the reaction tank 100 or at a general operation table, etc., and is electrically connected to the control unit, the water outlet module 200, the mass separation mud discharging module 300 and the degassing module 400 through the control circuit, so as to control the start and stop of each module and adjust the reaction system 10 in time. Therefore, the invention realizes intelligent automatic control.
When the integrated short-cut nitrification-anaerobic ammonia oxidation reaction system 10 provided by the invention is used, sewage to be treated is pumped into the reaction tank 100, and the sewage can be filtered before use so as to filter out particle impurities or other solid impurities in the sewage. After sewage enters the reaction tank 100, the control unit is started, the numerical range of each index in the reaction tank 100 is monitored in real time through the monitoring device, the concentration of dissolved oxygen in the reaction tank 100 is controlled through adjusting the aeration device, and the concentration of ammonia nitrogen and nitrite nitrogen in the reaction tank 100 is controlled, so that the shortcut nitrification reaction and the anaerobic ammonia oxidation reaction in water occur simultaneously, and the contact of the ammonia nitrogen in the sewage and the AOB in the reaction process generates the shortcut nitrification reaction to generate the nitrite nitrogen; the generated nitrite nitrogen and the residual ammonia nitrogen react with AnAOB to generate nitrogen through anaerobic ammoxidation, so that ammonia nitrogen in water is removed and converted into nitrogen, and denitrification is completed. Due to the arrangement of the degassing device, the ascending gas can not carry sludge out due to the air floatation effect.
Under the condition that the water inlet and outlet amount can be ensured under the condition of stable operation, the reaction tank 100 can simultaneously complete the short-cut nitrification reaction and the anaerobic ammonia oxidation reaction, the treated clear water is subjected to mud-water separation in the reaction tank 100, and the supernatant liquid is discharged out of the reaction tank 100 through the water outlet module 200 after reaching the discharge standard.
Further, after the reaction is operated to a certain stage, because the growth rate of the AOB is fast, the nitrous nitrogen content in the water increases, and at this time, the sludge concentration monitor monitors that the sludge concentration in the water exceeds a preset value, and the preset value may be the concentration of the AOB or the ratio of the AOB to the AnAOB, and the quality-dividing sludge discharging module 300 is started to divide the sludge in the circulating sedimentation zone 102 into quality and discharge, so that the sludge proportion in the circulating sedimentation zone 102 can be regulated.
The integrated short-cut nitrification-anaerobic ammonia oxidation reaction system 10 provided by the invention can realize the ammonia nitrogen removal treatment of sewage, synchronously realize two reactions of short-cut nitrification and anaerobic ammonia oxidation in the same reaction tank 100, realize a three-phase separation process, avoid the loss of AnAOB caused by bringing sludge in water into a water outlet module by gas, monitor the content of nitrous nitrogen in water, monitor the concentration of sludge in the reaction tank 100, realize automatic quality-separation and sludge discharge, and realize continuous and stable operation by the cooperation of the modules.
According to a second aspect of the present invention there is provided an integrated shortcut nitrification-anaerobic ammonia oxidation reaction process comprising the steps of:
step S1, pumping the sewage to be treated into an integrated short-cut nitrification-anaerobic ammonia oxidation reaction tank, and filtering is usually needed to remove solid pollutants in water before the sewage is pumped into the reaction tank so as not to block the reaction tank or influence subsequent reactions.
And S2, starting a control unit, so that the short-cut nitrification-anaerobic ammoxidation reaction is started, and the stable operation of the system is maintained through the control unit. In some embodiments of the present invention, the pH may be controlled in the range of 6.5 to 8.3 in this step. Specifically, the maintaining stable operation of the system by the control unit in this step further includes: the short-cut nitrification reaction and the anaerobic ammoxidation reaction are simultaneously performed by controlling the aeration amount while controlling the concentration of ammonia nitrogen to be in a range of more than 20mg/L, the concentration of nitrous nitrogen to be in a range of less than 50mg/L, and the concentration of dissolved oxygen to be in a range of not more than 0.5 mg/L. That is, the control unit monitors the ammonia nitrogen concentration, the nitrite nitrogen concentration and the dissolved oxygen concentration in the reaction tank, and adjusts the aeration module to adjust the aeration amount, and controls the concentrations to be in a proper range, so that the shortcut nitrification and the anaerobic ammonia oxidation do not need to be carried out in stages, and the ammonia nitrogen removal treatment of the sewage can be realized under the condition of ensuring stable water inlet and outlet.
And S3, when the concentration of the sludge exceeds the preset value range, carrying out quality-classifying sludge discharge on the reaction tank. The concentration of the sludge may be, for example, the concentration of AOB, or the ratio of the concentration of AOB to AnAOB, as described above. Further, the separating and discharging the sludge from the reaction tank may include: a loop sedimentation zone is formed in the reaction tank, which loop sedimentation zone is located below the degassing module, as described above, in which case the loop sedimentation zone is divided into a primary sedimentation zone and a secondary sedimentation zone by adjusting the rising flow rate. The AOB with slow sedimentation rate is flocculent and enters a primary sedimentation zone, while the AnAOB with fast sedimentation rate is granular and enters a secondary sedimentation zone, and the step S3-1 is performed. At this time, the sludge in the primary sedimentation zone is discharged through the sludge discharge pipe, step S3-2. And (3) carrying out secondary sedimentation on the discharged sludge in a collecting part, and refluxing clear liquid in a clear liquid zone in the collecting part into a secondary sedimentation zone in the reaction tank, wherein the step (S3-3) is carried out. And step S3-4, regulating the rising flow rate in the reaction tank by regulating the reflux rate of the clear liquid. In some embodiments, the ratio of AOB to AnAOB is controlled to be 1:1-3:1 in step S3, in other words, the process of mass-separation sludge discharge may be stopped after the ratio is reached, and the operations of steps S1 and S2 may be continued.
Therefore, the process provided by the invention can continuously and stably run, namely ammonia nitrogen in water can be stably removed, automatic sludge discharge can be realized, the operation is simple, personnel monitoring is not needed, and the adjustment and maintenance are convenient.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate directions or positional relationships based on those shown in the drawings, and that the direction of the end plate to which the water outlet pipe 202 is fixed is defined as a front direction unless otherwise specified, and that the front and rear directions may be interchanged with each other if specifically specified; this is merely to facilitate describing the invention and to simplify the description and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element discussed below could be termed a second element without departing from the teachings of the present invention. Similarly, a second element may also be referred to as a first element.
In the description of the present specification, the descriptions of the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described in this specification and the features of the various embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Claims (8)
1. The integrated short-cut nitrification-anaerobic ammoxidation reaction system is characterized by comprising a reaction tank, a control unit, a water outlet module, a quality-dividing sludge discharge module and a degassing module, wherein the water outlet module, the quality-dividing sludge discharge module and the degassing module are arranged in the reaction tank, a circulation sedimentation zone is formed in the reaction tank, the control unit regulates the rising flow rate of mixed liquor in the circulation sedimentation zone through the quality-dividing sludge discharge module so as to form a primary sedimentation zone and a secondary sedimentation zone in the circulation sedimentation zone, the primary sedimentation zone is positioned above the secondary sedimentation zone, and the circulation sedimentation zone is controlled by the control unit, so that the primary sedimentation zone is positioned above the secondary sedimentation zone
The mass-separation mud-discharge module comprises: a mud discharge pipe, a collecting part, a return pipe and a return pump, wherein
One end of the mud discharging pipe is communicated with the primary sedimentation area, the other end of the mud discharging pipe is communicated with the collecting part, one end of the return pipe is communicated to the clear liquid area of the collecting part, the other end of the return pipe is communicated to the secondary sedimentation area, and the return pump is arranged in the return pipe.
2. The integrated shortcut nitrification-anaerobic ammonia oxidation reaction system according to claim 1, wherein said degassing module comprises a first degassing portion and a second degassing portion which are sequentially arranged from top to bottom; the water outlet module is arranged at one side of the first degassing part far away from the inner wall of the reaction tank; a downward flow channel is formed between the degassing module and the inner wall of the reaction tank, an upward flow channel is formed in a space of the second degassing part on one side of the water outlet module, and gas is discharged through the first degassing part; wherein the method comprises the steps of
The loop settling zone is located below the degassing module.
3. The integrated shortcut nitrification-anaerobic ammonia oxidation reaction system according to claim 2, wherein the water outlet module comprises a water discharge weir and a water outlet pipe, the water discharge weir is arranged at the central position of the top of the reaction tank, one end of the water outlet pipe is arranged at the bottom of the water discharge weir, and the other end of the water outlet pipe passes through the side wall of the reaction tank and is communicated with the outside.
4. The integrated short-cut nitrification-anaerobic ammonia oxidation reaction system according to any one of claims 1 to 3, wherein the control unit comprises:
the aeration device comprises an aeration pipe arranged at the lower part of the reaction tank and a fan communicated with the aeration pipe;
the monitoring device comprises a sludge concentration monitor, a nitrous nitrogen concentration monitor, an ammonia nitrogen concentration monitor, a pH value monitor, a temperature monitor and a dissolved oxygen monitor which are arranged in the reaction tank; and a pH value adjusting device and a temperature adjusting device.
5. The integrated short-cut nitrification-anaerobic ammonia oxidation reaction system according to claim 4, wherein the reaction system further comprises a master controller and a control circuit, and the control unit, the water outlet module and the quality-dividing sludge discharge module are electrically connected with the master controller through the control circuit.
6. The integrated short-cut nitrification-anaerobic ammoxidation reaction process is characterized by comprising the following steps of:
step S1, pumping sewage to be treated into an integrated shortcut nitrification-anaerobic ammonia oxidation reaction tank;
s2, starting a control unit, so that a short-cut nitrification-anaerobic ammoxidation reaction is started, and keeping the system to stably run through the control unit;
s3, when the sludge concentration is detected to exceed the preset value range, carrying out quality-classifying sludge discharge on the reaction tank, wherein
The step S3 of separating the reaction tank into quality and discharging mud includes:
s3-1, forming a circulating sedimentation zone in the reaction tank, and enabling the circulating sedimentation zone to be divided into a primary sedimentation zone and a secondary sedimentation zone by adjusting the rising flow rate, wherein the secondary sedimentation zone is positioned below the primary sedimentation zone;
s3-2, discharging sludge in the primary sedimentation zone through a sludge discharge pipe;
s3-3, carrying out secondary sedimentation on the sludge discharged in the step S3-2 in a collecting part, and refluxing clear liquid in a clear liquid zone of the collecting part into the secondary sedimentation zone in the reaction tank;
and step S3-4, adjusting the rising flow rate in the reaction tank by adjusting the reflux rate of the clear liquid.
7. The integrated shortcut nitrification-anaerobic ammonia oxidation reaction process according to claim 6, wherein the range of the preset value of the sludge concentration in said step S3 is: the ratio of AOB to AnAOB is in the range of 1:1 to 3:1.
8. The integrated short-cut nitrification-anaerobic ammonia oxidation process according to claim 6, wherein the maintaining of the stable operation of the system by the control unit in the step S2 further comprises: controlling the short-cut nitrification reaction and the anaerobic ammoxidation reaction simultaneously by controlling the aeration amount while controlling the concentration of ammonia nitrogen to be in a range higher than 20mg/L, the concentration of nitrous nitrogen to be in a range lower than 50mg/L, and the concentration of dissolved oxygen to be in a range not more than 0.5 mg/L; and in the step S2, the pH value is controlled to be in the range of 6.5-8.3.
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