CN115893648A - Municipal sewage short-cut nitrification treatment system and method - Google Patents
Municipal sewage short-cut nitrification treatment system and method Download PDFInfo
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- CN115893648A CN115893648A CN202211282398.3A CN202211282398A CN115893648A CN 115893648 A CN115893648 A CN 115893648A CN 202211282398 A CN202211282398 A CN 202211282398A CN 115893648 A CN115893648 A CN 115893648A
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- 239000010865 sewage Substances 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000010802 sludge Substances 0.000 claims abstract description 209
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 98
- 238000004062 sedimentation Methods 0.000 claims abstract description 30
- 150000001540 azides Chemical class 0.000 claims abstract description 21
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 15
- 230000001629 suppression Effects 0.000 claims abstract description 11
- 230000005764 inhibitory process Effects 0.000 claims description 59
- 239000003814 drug Substances 0.000 claims description 25
- 238000005276 aerator Methods 0.000 claims description 20
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 19
- 238000009825 accumulation Methods 0.000 claims description 17
- PXIPVTKHYLBLMZ-UHFFFAOYSA-N Sodium azide Chemical compound [Na+].[N-]=[N+]=[N-] PXIPVTKHYLBLMZ-UHFFFAOYSA-N 0.000 claims description 16
- -1 azide compound Chemical class 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 14
- 238000010992 reflux Methods 0.000 claims description 13
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- JUINSXZKUKVTMD-UHFFFAOYSA-N hydrogen azide Chemical compound N=[N+]=[N-] JUINSXZKUKVTMD-UHFFFAOYSA-N 0.000 claims description 4
- TZLVRPLSVNESQC-UHFFFAOYSA-N potassium azide Chemical compound [K+].[N-]=[N+]=[N-] TZLVRPLSVNESQC-UHFFFAOYSA-N 0.000 claims description 4
- SEDZOYHHAIAQIW-UHFFFAOYSA-N trimethylsilyl azide Chemical compound C[Si](C)(C)N=[N+]=[N-] SEDZOYHHAIAQIW-UHFFFAOYSA-N 0.000 claims description 4
- 238000003911 water pollution Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000006396 nitration reaction Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 241001453382 Nitrosomonadales Species 0.000 description 8
- 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 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 239000003112 inhibitor Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention belongs to the field of water pollution treatment, and discloses a short-cut nitrification treatment system and method for municipal sewage. The system comprises: urban sewage water tank, urban sewage short distance nitration device, sedimentation tank device, side mud suppression device and charge device. The invention is not influenced by temperature, DO and pH, so that the short-cut nitrification of the municipal sewage is quickly realized, and meanwhile, a side sludge inhibiting device of side flow azide is used as an auxiliary device to strengthen the stable short-cut nitrification process, so that the system is in the stable short-cut nitrification process for a long time, and an effective solution is provided for the defects of long realization period and unstable operation of the current short-cut nitrification of the municipal sewage.
Description
Technical Field
The invention belongs to the field of water pollution treatment, and particularly relates to a short-cut nitrification treatment system and method for urban sewage.
Background
From the eighties of the last century, the water environment condition deteriorates continuously, especially in recent years, along with the rapid development of economy and urban construction, the urban scale increases continuously, the urban water consumption and the water discharge amount increase continuously, and the discharge amount of sewage and wastewater reaches 18 hundred million meters per year 3 Is increased. Although the pace of water environment treatment is accelerated in recent years and the treatment of water pollution is greatly improved, the problem of water pollution is increasingly serious due to the gradual increase of the sewage quantity. Among them, nitrogen has become one of important pollutants, and nitrogen discharged from wastewater causes excessive propagation of algae, thereby resulting in eutrophication of water.
The traditional nitrification and denitrification biological denitrification technology is mainly characterized in that ammonia nitrogen is oxidized into nitrite nitrogen by Ammonia Oxidizing Bacteria (AOB) under aerobic conditions, the nitrite nitrogen is oxidized into nitrate nitrogen by Nitrite Oxidizing Bacteria (NOB), and the nitrate nitrogen is reduced into nitrite nitrogen by the denitrification bacteria under anoxic conditions and finally into nitrogen. The short-cut nitrification biological denitrification is a biochemical reaction process that Ammonia Oxidizing Bacteria (AOB) oxidize ammonia nitrogen into nitrite nitrogen and denitrifying bacteria reduce the nitrite nitrogen into nitrogen. Compared with the traditional nitrification and denitrification biological denitrification technology, the short-cut biological denitrification can reduce 25 percent of aeration quantity and 40 percent of carbon source adding quantity and shorten 4.3 times of reaction process.
The stable short-cut nitrification of the municipal sewage is a difficult problem. The essence of short-cut nitrification is that NOB becomes a disadvantaged genus and is gradually elutriated out of the system, and NH4 is removed by using AOB + Oxidation of-N to NO 2 - -N. Currently, short-cut nitrification is mainly achieved by controlling Dissolved Oxygen (DO) concentration, free Ammonia (FA) inhibition, free Nitrous Acid (FNA) inhibition, intermittent aeration, and the like. The method can realize short-cut nitrificationHowever, after the inhibition condition is removed, the short-cut nitrification is quickly destroyed and converted into the whole-cut nitrification, the effluent quality is seriously influenced, and the operation process is complicated.
Therefore, there is a need to provide a method and system for performing short-cut nitrification rapidly and stably for a long period of time.
Disclosure of Invention
The invention aims to provide a system and a method for shortcut nitrification treatment of municipal sewage, aiming at the problems of difficult realization, complex operation and unstable operation of shortcut nitrification of municipal sewage in the prior art. The invention is not influenced by temperature, DO and pH, so that the short-cut nitrification of the municipal sewage is quickly realized, and meanwhile, a side sludge inhibiting device of side flow azide is used as an auxiliary device to strengthen the stable short-cut nitrification process, so that the system is in the stable short-cut nitrification process for a long time, and an effective solution is provided for the defects of long realization period and unstable operation of the current short-cut nitrification of the municipal sewage.
In order to achieve the above object, a first aspect of the present invention provides a municipal sewage short-cut nitrification treatment system, which comprises: the system comprises an urban sewage water tank, an urban sewage short-cut nitrification device, a sedimentation tank device, a side sludge inhibition device and a dosing device;
the urban sewage water tank is connected with the urban sewage short-cut nitrification device;
the urban sewage short-cut nitrification device is connected with the sedimentation tank device;
the dosing device is respectively connected with the municipal sewage short-cut nitrification device and the side sludge inhibition device;
the side sludge inhibiting device is connected with the municipal sewage short-cut nitrification device.
According to the present invention, it is preferable that,
the urban sewage short-cut nitrification device comprises an anoxic zone, an anaerobic zone and an aerobic zone which are sequentially communicated;
a first water inlet, a side inhibition sludge discharge port and a sludge return port are formed in the water inlet side of the anoxic zone;
a first medicine inlet is formed in the water inlet side of the aerobic zone, and a first water outlet is formed in the water outlet side of the aerobic zone; a first gas flowmeter, a DO sensor and a first aerator are arranged in the aerobic zone;
the municipal sewage water tank is communicated with the first water inlet through a water inlet pump;
the sedimentation tank device comprises a sedimentation tank body, a sludge reflux pump and a residual sludge discharge pump; the sedimentation tank body is provided with a second water inlet, a second water outlet and a bottom sludge discharge port; the second water inlet is communicated with the first water inlet through a first water outlet pipe; the second water outlet is connected with a second water outlet pipe; the bottom sludge discharge port is respectively connected with the sludge reflux pump and the excess sludge discharge pump; the sludge reflux pump is connected with the sludge reflux port through a sludge reflux pipe; the excess sludge discharge pump is respectively connected with the excess sludge discharge pipe and the side sludge inhibition sludge inlet pipe through a first valve and a second valve;
the side sludge inhibiting device comprises a side sludge inhibiting tank body and a sludge discharge pump; the side sludge inhibition tank body is provided with a sludge inlet, a sludge discharge port and a second medicine inlet; the side sludge inhibition sludge inlet pipe is communicated with the sludge inlet; the sludge discharge port is communicated with the side inhibition sludge discharge inlet through the sludge discharge pump and a side sludge inhibition sludge discharge pipe; a second gas flowmeter and a second aerator are arranged in the side sludge suppression tank body;
the dosing device comprises a dosing tank and a dosing pump; one end of the dosing pump is connected with a medicine outlet of the dosing tank, and the other end of the dosing pump is connected with the first dosing pipe and the second dosing pipe through a third valve and a fourth valve respectively; the first dosing pipe is connected with the first dosing port, and the second dosing pipe is connected with the second dosing port.
According to the present invention, preferably, a first stirrer is provided in the anoxic zone.
According to the present invention, preferably, a second agitator is provided in the anaerobic zone.
According to the invention, preferably, the first aerator is arranged at the bottom of the aerobic zone and is connected with a first air blower outside the municipal sewage short-cut nitrification device through the first gas flow meter.
According to the invention, preferably, the DO sensor is connected with an online meter which is positioned outside the municipal sewage short-cut nitrification device.
According to the invention, preferably, the second aerator is arranged at the bottom of the side sludge suppression pool body and is connected with a second air blower positioned outside the side sludge suppression pool body through the second gas flow meter.
According to the present invention, preferably, the city sewage tank comprises a city sewage tank body and an overflow pipe; the overflow pipe is arranged at the upper part of the urban sewage tank body; and a water outlet at the bottom of the urban sewage tank body is communicated with the first water inlet through the water inlet pump.
According to the present invention, preferably, a third stirrer is provided in the dosing tank.
The second aspect of the invention provides a short-cut nitrification treatment method for urban sewage, which adopts the short-cut nitrification treatment system for urban sewage and comprises the following steps:
s1: sending floc sludge, return sludge from the sedimentation tank device and municipal sewage from the municipal sewage water tank into the municipal sewage shortcut nitrification device, starting the first aerator, and determining whether the activity of the sludge in the municipal sewage shortcut nitrification device is recovered or not by detecting the ammonia nitrogen removal rate of the effluent water of the first water outlet of the aerobic zone;
in the present invention, the method for detecting the ammonia nitrogen removal rate of the effluent from the first water outlet of the aerobic zone is a method conventionally used by those skilled in the art, and is preferably ([ NH ]) 4 + -N] Inflow water —[NH 4 + -N] The first water outlet )*100％/[NH 4 + -N] Inflow water The method of calculating (2).
S2: after the activity of the sludge in the municipal sewage short-cut nitrification device is recovered, starting the dosing pump and the third valve, and feeding the azide compound into the aerobic zone until the nitrite accumulation rate in the municipal sewage short-cut nitrification device reaches a threshold value, so that the municipal sewage short-cut nitrification treatment is realized in the municipal sewage short-cut nitrification device, and the dosing pump and the third valve are closed;
s3: after the short-cut nitrification treatment of the urban sewage is realized in the urban sewage short-cut nitrification device, the part of the excess sludge discharged from the sedimentation tank device by the excess sludge discharge pump is fed into the side sludge inhibition tank body through the side sludge inhibition sludge inlet pipe at intervals of preset time, the second aerator, the dosing pump and the fourth valve are started, azide is added into the side sludge inhibition tank body, the sludge in the side sludge inhibition tank body is inhibited, and the sludge after the inhibition is discharged into the anoxic zone.
In the present invention, inhibition of NOB activity of the completed sludge is strongly inhibited, with AOB predominating. The sludge after the inhibition is utilized to realize the enhancement of the short-cut nitrification effect in the urban sewage short-cut nitrification device.
According to the invention, preferably, in step S1:
the floc sludge is full-course nitrified sludge, and the concentration of the floc sludge is controlled to be 3000-4000 mg/L;
controlling the DO concentration of the aerobic zone to be 1.5-3 mg/L and the sludge age to be 15-20d;
controlling the hydraulic retention time of the municipal sewage short-cut nitrification device to be 12-20h;
and when the ammonia nitrogen removal rate of the effluent at the first water outlet of the aerobic zone reaches over 90 percent, the activity of the sludge in the municipal sewage short-cut nitrification device is recovered.
According to the invention, preferably, in step S2:
the threshold value of the nitrite accumulation rate in the municipal sewage short-cut nitrification device is more than or equal to 90 percent;
the concentration of the azide compound added into the aerobic zone is 0.5-3 mg/L; the azide is an inorganic azide and/or an organic azide;
preferably, the inorganic azide is at least one of sodium azide, potassium azide and hydrazoic acid;
preferably, the organic azide compound is trimethylsilyl azide.
According to the present invention, preferably, in step S3;
after the urban sewage is subjected to short-cut nitrification treatment in the urban sewage short-cut nitrification device, controlling the DO concentration of the aerobic zone to be 1.5-3 mg/L and the sludge age to be 10-15d, and controlling the hydraulic retention time of the urban sewage short-cut nitrification device to be 8-12h;
the preset time is determined according to a threshold value of the nitrite accumulation rate in the municipal sewage short-cut nitrification device; when the NAR in the short-distance municipal sewage nitrification device is lower than 90%, correspondingly shortening the preset time, and when the NAR in the short-distance municipal sewage nitrification device is higher than 90%, correspondingly increasing the preset time, preferably, when the nitrite accumulation rate of the effluent of the first water outlet of the aerobic zone is lower than the threshold, the preset time is 6-12 h, and when the nitrite accumulation rate of the effluent of the first water outlet of the aerobic zone is higher than the threshold, the preset time is 24-72 h;
the time for inhibiting the sludge in the side sludge inhibiting tank is 0.5 to 3 hours;
the volume of the sludge which is discharged into the anoxic zone each time and is inhibited is 10 to 15 percent of the volume of the municipal sewage short-cut nitrification device; the concentration of sludge which is discharged into the anoxic zone each time and is inhibited is 5000-8000 mg/L;
the concentration of the azide compound added into the side sludge inhibition tank body is 0.5-3 mg/L; the azide is an inorganic azide and/or an organic azide;
preferably, the inorganic azide is at least one of sodium azide, potassium azide and hydrazoic acid;
preferably, the organic azide compound is trimethylsilyl azide;
and discharging other parts of the excess sludge discharged from the sedimentation tank device through the excess sludge discharge pump out of the municipal sewage short-cut nitrification treatment system through an excess sludge discharge pipe.
In the invention, through a plurality of tests for a long time, the inventor screens a plurality of medicaments to obtain a chemical medicament capable of quickly realizing short-cut nitrification, namely, an azide compound, and through experimental research, the azide compound has high-efficiency selective inhibition on NOB and weak inhibition on AOB.
In the invention, the concentration of the azide compound in the medicine adding device is 1-5 mg/L.
The technical scheme of the invention has the following beneficial effects:
1) The invention comprises an urban sewage water tank, an urban sewage short-cut nitrification device, a sedimentation tank device, a side sludge inhibition device and a dosing device. After full-course nitrification floc sludge is inoculated, an inhibitor is continuously added into the urban sewage short-cut nitrification device through the dosing device, after the urban sewage short-cut nitrification device realizes short-cut nitrification, the dosing device is stopped, part of sludge is discharged into the side sludge inhibition device at the moment, the dosing device adds the agent into the side sludge device, after inhibition is completed, the sludge after side inhibition is discharged into the urban sewage short-cut nitrification device, through inhibition and elutriation, the abundance of NOB in the urban sewage short-cut Cheng Xiao device is obviously lower than that of AOB, the NOB is in a disadvantaged state for a long time, long-term stable short-cut nitrification of the device is achieved, and water outlet NH is discharged +4 the-N is 0.5-5 mg/L, and the Nitrite Accumulation Rate (NAR) in the municipal sewage shortcut nitrification device is 90-98%.
2) The invention is suitable for low ammonia nitrogen wastewater, is not influenced by temperature, can quickly realize the shortcut nitrification of continuous flow mainstream municipal sewage, and can provide a stable nitrite source for anaerobic ammonia oxidation of the municipal sewage.
3) The invention has no need of accurately controlling the operation parameters of the process DO, the pH, the temperature and the like in the implementation process, and has simple operation.
4) According to the invention, the azide is used as an inhibitor, NOB is efficiently and selectively inhibited, the inhibition time interval range is large, and the inhibitor concentration controllable range is large.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 shows a schematic diagram of a municipal sewage short-cut nitrification treatment system provided by embodiment 1 of the invention.
The reference numerals are illustrated below:
1-urban sewage tank; 1.1-urban sewage tank body; 1.2-overflow pipe; 1.3, discharging a water pump;
2-municipal sewage short-cut nitrification device; 2.1-anoxic zone; 2.2-anaerobic zone; 2.3-aerobic zone; 2.4-a first stirrer; 2.5-a second stirrer; 2.6-first gas flow meter; 2.7-DO sensor; 2.8-on-line instrument; 2.9-a first aerator; 2.10 — first blower; 2.11-first outlet pipe; 2.12 — a first water inlet; 2.13-side inhibition sludge discharge port; 2.14-sludge return port; 2.15-first medicine inlet; 2.16-a first water outlet;
3-a sedimentation tank device; 3.1-a sedimentation tank body; 3.2-sludge reflux pump; 3.3-sludge return pipe; 3.4-excess sludge discharge pump; 3.5-a first valve; 3.6-second valve; 3.7-excess sludge discharge pipe; 3.8-side sludge is inhibited to enter the sludge pipe; 3.9-a second water outlet pipe; 3.10-a second water inlet; 3.11-a second water outlet; 3.12-bottom sludge discharge port;
4-a side sludge suppression device; 4.1-a side sludge inhibition tank; 4.2-a second aerator; 4.3-a second gas flow meter; 4.4-sludge discharge pump; 4.5-a second blower; 4.6-side sludge restraining sludge discharge pipe; 4.7-a sludge inlet; 4.8-sludge discharge port; 4.9-second medicine inlet;
5-a medicine adding device; 5.1-a medicine adding tank; 5.2-a third stirrer; 5.3-dosing pump; 5.4-a third valve; 5.5-a first dosing tube; 5.6-a fourth valve; 5.7-second dosing tube.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
This embodiment provides a municipal sewage short distance nitrification treatment system, as shown in fig. 1, this system includes: the system comprises an urban sewage water tank 1, an urban sewage short-cut nitrification device 2, a sedimentation tank device 3, a side sludge inhibition device 4 and a dosing device 5;
the urban sewage short-cut nitrification device 2 comprises an anoxic zone 2.1, an anaerobic zone 2.2 and an aerobic zone 2.3 which are communicated in sequence;
a first water inlet 2.12, a side inhibition sludge discharge port 2.13 and a sludge return port 2.14 are arranged on the water inlet side of the anoxic zone 2.1; a first stirrer 2.4 is arranged in the anoxic zone 2.1; a second stirrer 2.5 is arranged in the anaerobic zone 2.2;
a first medicine inlet 2.15 is formed in the water inlet side of the aerobic zone 2.3, and a first water outlet 2.16 is formed in the water outlet side of the aerobic zone 2.3; a first gas flowmeter 2.6, a DO sensor 2.7 and a first aerator 2.9 are arranged in the aerobic zone 2.3; the first aerator 2.9 is arranged at the bottom of the aerobic zone 2.3 and is connected with a first air blower 2.10 positioned outside the municipal sewage short-cut nitrification device through the first gas flow meter 2.6; and the DO sensor 2.7 is connected with an online instrument 2.8 positioned outside the municipal sewage short-cut nitrification device.
The urban sewage tank 1 comprises an urban sewage tank body 1.1 and an overflow pipe 1.2; the overflow pipe 1.2 is arranged at the upper part of the urban sewage water tank body 1.1; and a water outlet at the bottom of the urban sewage water tank body 1.1 is communicated with the first water inlet through a water inlet pump 1.3.
The sedimentation tank device 3 comprises a sedimentation tank body 3.1, a sludge reflux pump 3.2 and a residual sludge discharge pump 3.4; the sedimentation tank body 3.1 is provided with a second water inlet 3.10, a second water outlet 3.11 and a bottom sludge discharge port 3.12; the second water inlet 3.10 is communicated with the first water inlet 2.12 through a first water outlet pipe 2.11; the second water outlet 3.11 is connected with a second water outlet pipe 3.9; the bottom sludge discharge port 3.12 is respectively connected with the sludge reflux pump 3.2 and the excess sludge discharge pump 3.4; the sludge return pump 3.2 is connected with the sludge return port 2.14 through a sludge return pipe 3.3; the excess sludge discharge pump 3.4 is respectively connected with an excess sludge discharge pipe 3.7 and a side sludge inhibition sludge inlet pipe 3.8 through a first valve 3.5 and a second valve 3.6;
the side sludge inhibiting device 4 comprises a side sludge inhibiting tank body 4.1 and a sludge discharge pump 4.4; the side sludge inhibition tank body is provided with a sludge inlet 4.7, a sludge discharge port 4.8 and a second medicine inlet 4.9; the side sludge inhibition sludge inlet pipe 3.8 is communicated with the sludge inlet 4.7; the sludge discharge port 4.8 is communicated with the side inhibition sludge discharge port 2.13 through the sludge discharge pump 4.4 and a side inhibition sludge discharge pipe 4.6; a second gas flowmeter 4.3 and a second aerator 4.2 are arranged in the side sludge suppression pool body 4.1; the second aerator 4.2 is arranged at the bottom of the side sludge suppression pool body 4.1 and is connected with a second blower 4.5 positioned outside the side sludge suppression pool body 4.1 through the second gas flow meter 4.3.
The dosing device 5 comprises a dosing tank 5.1 and a dosing pump 5.3; one end of the dosing pump 5.3 is connected with a medicine outlet of the dosing tank 5.1, and the other end of the dosing pump 5.3 is connected with a first dosing pipe 5.5 and a second dosing pipe 5.7 through a third valve 5.4 and a fourth valve 5.6 respectively; the first medicine adding pipe 5.5 is connected with the first medicine inlet 2.15, and the second medicine adding pipe 5.7 is connected with the second medicine inlet 4.9. And a third stirrer 5.2 is arranged in the medicine adding tank 5.1.
Example 2
The embodiment provides a short-cut nitrification treatment method for municipal sewage, which comprises the steps of taking the effluent of a primary sedimentation tank of a certain regeneration treatment plant as the municipal sewage, and sending the municipal sewage into a municipal sewage water tank for storage, wherein the water quality is shown in table 1.
The method adopts the municipal sewage short-cut nitrification treatment system described in embodiment 1, and comprises the following steps:
s1: feeding floc sludge (the floc sludge is full-course nitrified sludge, the concentration of the floc sludge is controlled to be 3500 mg/L), return sludge from the sedimentation tank device 3 and urban sewage from the urban sewage water tank 1 into the urban sewage short-cut nitrifying device 2, starting the first aerator 2.9, controlling the DO concentration of the aerobic zone 2.3 to be 1.5-3 mg/L and the sludge age to be 18d; controlling the hydraulic retention time of the municipal sewage short-cut nitrification device 2 to be 16h; and when the ammonia nitrogen removal rate of the effluent of the first water outlet 2.16 of the aerobic zone 2.3 reaches over 90 percent, the activity of the sludge in the municipal sewage short-cut nitrification device 2 is recovered.
S2: after the activity of the sludge in the municipal sewage short-cut nitrification device 2 is recovered, the dosing pump 5.3 and the third valve 5.4 are started, the sodium azide (with the concentration of 2 mg/L) is added into the aerobic zone 2.3 until the nitrite accumulation rate in the municipal sewage short-cut nitrification device 2 reaches more than 90%, the municipal sewage short-cut nitrification treatment is realized in the municipal sewage short-cut nitrification device 2, the dosing pump 5.3 and the third valve 5.4 are closed, and then the sodium azide is not added into the municipal sewage short-cut nitrification device 2.
The concentration of sodium azide in the dosing device 5 was 4g/L.
S3: after the short-cut nitrification treatment of the urban sewage is realized in the urban sewage short-cut nitrification device 2, the DO concentration of the aerobic zone 2.3 is controlled to be 1.5-3 mg/L, the sludge age is 13d, and the hydraulic retention time of the urban sewage short-cut nitrification device 2 is controlled to be 10h; and sending part of the excess sludge discharged from the sedimentation tank device 3 by the excess sludge discharge pump 3.4 into a side sludge inhibition tank body 4.1 through a side sludge inhibition sludge inlet pipe 3.8 at preset intervals, starting the second aerator 4.2, the dosing pump 5.3 and the fourth valve 5.6, adding an azide compound (with the concentration of 2 mg/L) into the side sludge inhibition tank body 4.1, inhibiting the sludge in the side sludge inhibition tank body 4.1, and discharging the sludge after inhibition into the anoxic zone 2.1. Other part of the excess sludge discharged from the sedimentation tank device 3 through the excess sludge discharge pump 3.4 is discharged out of the municipal sewage short-cut nitrification system through an excess sludge discharge pipe 3.7.
The preset time is determined according to a threshold value of nitrite accumulation rate in the municipal sewage short-cut nitrification device 2, when the nitrite accumulation rate of the effluent water at the first water outlet 2.16 of the aerobic zone 2.3 is lower than 90%, the preset time is 6h, and when the nitrite accumulation rate of the effluent water at the first water outlet 2.16 of the aerobic zone 2.3 is higher than 90%, the preset time is 48h;
the time for inhibiting the sludge in the side sludge inhibition tank body 4.1 is 1h;
the volume of the sludge which is discharged into the anoxic zone 2.1 each time and is inhibited is 1/8 of the volume of the municipal sewage short-cut nitrification device 2; the concentration of sludge discharged into the anoxic zone 2.1 each time after the inhibition is completed is 6000mg/L.
TABLE 1
Note: the index units are all mg/L, and a water sample is not filtered.
Detecting the effluent quality of the effluent of the primary sedimentation tank of a certain regeneration treatment plant treated by the system and the method by adopting a water and wastewater monitoring and analyzing method published by the State environmental protection agency, detecting nitrite nitrogen and nitrate nitrogen in the municipal sewage short-cut nitrification device 2 by adopting a water and wastewater monitoring and analyzing method published by the State environmental protection agency, and adopting a formula Nitrite Accumulation Rate (NAR) = [ NO ] = [ 2 - -N]*100％/([NO 2 - -N]+[NO 3 - -N]) NAR was calculated and the results showed that: after the full-course nitrification floc sludge is inoculated, an inhibitor sodium azide is continuously added into the urban sewage short-range nitrification device 2 through the dosing device 5, short-range nitrification is realized and then side sludge inhibition is supplemented, and the short-range nitrification process is quickly realized and stabilized for a long time, wherein the average value of the effluent ammonia nitrogen of the effluent of the primary sedimentation tank of a certain regeneration treatment plant treated by the system and the method is 1.5mg/L, and the average value of the Nitrite Accumulation Rate (NAR) in the urban sewage short-range nitrification device 2 is 96%.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The municipal sewage short-cut nitrification treatment system is characterized by comprising: the system comprises an urban sewage water tank, an urban sewage short-cut nitrification device, a sedimentation tank device, a side sludge inhibition device and a dosing device;
the urban sewage water tank is connected with the urban sewage short-cut nitrification device;
the municipal sewage short-cut nitrification device is connected with the sedimentation tank device;
the dosing device is respectively connected with the municipal sewage short-cut nitrification device and the side sludge inhibition device;
and the side sludge inhibiting device is connected with the municipal sewage short-cut nitrification device.
2. The municipal sewage short-cut nitrification treatment system according to claim 1, wherein,
the urban sewage short-cut nitrification device comprises an anoxic zone, an anaerobic zone and an aerobic zone which are sequentially communicated;
a first water inlet, a side inhibition sludge discharge port and a sludge return port are formed in the water inlet side of the anoxic zone;
a first medicine inlet is formed in the water inlet side of the aerobic zone, and a first water outlet is formed in the water outlet side of the aerobic zone; a first gas flowmeter, a DO sensor and a first aerator are arranged in the aerobic zone;
the urban sewage tank is communicated with the first water inlet through a water inlet pump;
the sedimentation tank device comprises a sedimentation tank body, a sludge reflux pump and a residual sludge discharge pump; the sedimentation tank body is provided with a second water inlet, a second water outlet and a bottom sludge discharge port; the second water inlet is communicated with the first water inlet through a first water outlet pipe; the second water outlet is connected with a second water outlet pipe; the bottom sludge discharge port is respectively connected with the sludge reflux pump and the excess sludge discharge pump; the sludge reflux pump is connected with the sludge reflux port through a sludge reflux pipe; the excess sludge discharge pump is respectively connected with the excess sludge discharge pipe and the side sludge inhibition sludge inlet pipe through a first valve and a second valve;
the side sludge inhibiting device comprises a side sludge inhibiting tank body and a sludge discharge pump; the side sludge inhibition tank body is provided with a sludge inlet, a sludge discharge port and a second medicine inlet; the side sludge inhibition sludge inlet pipe is communicated with the sludge inlet; the sludge discharge port is communicated with the side inhibition sludge discharge inlet through the sludge discharge pump and a side sludge inhibition sludge discharge pipe; a second gas flowmeter and a second aerator are arranged in the side sludge suppression tank body;
the dosing device comprises a dosing tank and a dosing pump; one end of the dosing pump is connected with a medicine outlet of the dosing tank, and the other end of the dosing pump is connected with the first dosing pipe and the second dosing pipe through a third valve and a fourth valve respectively; the first medicine feeding pipe is connected with the first medicine inlet, and the second medicine feeding pipe is connected with the second medicine inlet.
3. The municipal sewage short-cut nitrification treatment system according to claim 2, wherein,
a first stirrer is arranged in the anoxic zone; a second stirrer is arranged in the anaerobic zone;
the first aerator is arranged at the bottom of the aerobic zone and is connected with a first blower positioned outside the municipal sewage short-cut nitrification device through the first gas flow meter;
and the DO sensor is connected with an online instrument positioned outside the urban sewage short-cut nitrification device.
4. The municipal sewage short-cut nitrification treatment system according to claim 2, wherein the second aerator is disposed at the bottom of the side sludge suppression tank body and is connected to a second blower located outside the side sludge suppression tank body through the second gas flow meter.
5. The municipal sewage short-cut nitrification treatment system according to claim 2, wherein the municipal sewage tank comprises a municipal sewage tank body and an overflow pipe; the overflow pipe is arranged at the upper part of the urban sewage tank body; and a water outlet at the bottom of the urban sewage tank body is communicated with the first water inlet through the water inlet pump.
6. The municipal sewage short-cut nitrification treatment system according to claim 2, wherein a third stirrer is arranged in the dosing tank.
7. A short-cut nitrification treatment method for municipal sewage, which is characterized in that the short-cut nitrification treatment method for municipal sewage adopts the short-cut nitrification treatment system for municipal sewage of any one of claims 1 to 6, and comprises the following steps:
s1: sending floc sludge, return sludge from the sedimentation tank device and municipal sewage from the municipal sewage water tank into the municipal sewage shortcut nitrification device, starting the first aerator, and determining whether the activity of the sludge in the municipal sewage shortcut nitrification device is recovered or not by detecting the ammonia nitrogen removal rate of the effluent water of the first water outlet of the aerobic zone;
s2: after the activity of the sludge in the municipal sewage short-cut nitrification device is recovered, starting the dosing pump and the third valve, and feeding the azide compound into the aerobic zone until the nitrite accumulation rate in the municipal sewage short-cut nitrification device reaches a threshold value, so that the municipal sewage short-cut nitrification treatment is realized in the municipal sewage short-cut nitrification device, and the dosing pump and the third valve are closed;
s3: after the short-cut nitrification treatment of the urban sewage is realized in the urban sewage short-cut nitrification device, the part of the excess sludge discharged from the sedimentation tank device by the excess sludge discharge pump is fed into the side sludge inhibition tank body through the side sludge inhibition sludge inlet pipe at intervals of preset time, the second aerator, the dosing pump and the fourth valve are started, azide is added into the side sludge inhibition tank body, the sludge in the side sludge inhibition tank body is inhibited, and the sludge after the inhibition is discharged into the anoxic zone.
8. The municipal sewage short-cut nitrification treatment method according to claim 7, wherein, in step S1:
the floc sludge is full-course nitrified sludge, and the concentration of the floc sludge is controlled to be 3000-4000 mg/L;
controlling the DO concentration of the aerobic zone to be 1.5-3 mg/L and the sludge age to be 15-20 days;
controlling the hydraulic retention time of the municipal sewage short-cut nitrification device to be 12-20h;
and when the ammonia nitrogen removal rate of the effluent at the first water outlet of the aerobic zone reaches over 90 percent, the activity of the sludge in the municipal sewage short-cut nitrification device is recovered.
9. The municipal sewage short-cut nitrification treatment method according to claim 7, wherein in step S2:
the threshold value of the nitrite accumulation rate in the municipal sewage short-cut nitrification device is more than or equal to 90 percent;
the concentration of the azide compound added into the aerobic zone is 0.5-3 mg/L; the azide is an inorganic azide and/or an organic azide;
preferably, the inorganic azide is at least one of sodium azide, potassium azide and hydrazoic acid;
preferably, the organic azide compound is trimethylsilyl azide.
10. The municipal sewage short-cut nitrification treatment method according to claim 7, wherein, in step S3;
after the urban sewage is subjected to short-cut nitrification treatment in the urban sewage short-cut nitrification device, controlling the DO concentration of the aerobic zone to be 1.5-3 mg/L and the sludge age to be 10-15d, and controlling the hydraulic retention time of the urban sewage short-cut nitrification device to be 8-12h;
the preset time is determined according to a threshold value of nitrite accumulation rate in the municipal sewage short-cut nitrification device; preferably, when the accumulation rate of the nitrite in the effluent from the first water outlet of the aerobic zone is lower than the threshold value, the preset time is 6-12 hours, and when the accumulation rate of the nitrite in the effluent from the first water outlet of the aerobic zone is higher than the threshold value, the preset time is 24-72 hours;
the time for inhibiting the sludge in the side sludge inhibition tank is 0.5 to 3 hours;
the volume of the sludge which is discharged into the anoxic zone each time and is inhibited is 10 to 15 percent of the volume of the municipal sewage short-cut nitrification device; the concentration of sludge which is discharged into the anoxic zone each time and is inhibited is 5000-8000 mg/L;
the concentration of the azide compound added into the side sludge inhibition tank body is 0.5-3 mg/L; the azide is an inorganic azide and/or an organic azide;
preferably, the inorganic azide is at least one of sodium azide, potassium azide and hydrazoic acid;
preferably, the organic azide compound is trimethylsilyl azide;
and discharging other parts of the excess sludge discharged from the sedimentation tank device through the excess sludge discharge pump out of the system for the municipal sewage short-cut nitrification treatment through an excess sludge discharge pipe.
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