CN114873841A - Limit denitrification device for integrated sewage treatment system - Google Patents

Limit denitrification device for integrated sewage treatment system Download PDF

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Publication number
CN114873841A
CN114873841A CN202210392353.5A CN202210392353A CN114873841A CN 114873841 A CN114873841 A CN 114873841A CN 202210392353 A CN202210392353 A CN 202210392353A CN 114873841 A CN114873841 A CN 114873841A
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China
Prior art keywords
water
sewage treatment
treatment system
integrated sewage
denitrification
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Pending
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CN202210392353.5A
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Chinese (zh)
Inventor
刘夕清
刘海清
栾松明
杜鹏飞
蒲桂玲
王新艳
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Shandong Zhaojin Group Co ltd
SHANDONG ZHAOJIN MOTIAN CO Ltd
Original Assignee
Shandong Zhaojin Group Co ltd
SHANDONG ZHAOJIN MOTIAN CO Ltd
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Priority to CN202210392353.5A priority Critical patent/CN114873841A/en
Publication of CN114873841A publication Critical patent/CN114873841A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/006—Water distributors either inside a treatment tank or directing the water to several treatment tanks; Water treatment plants incorporating these distributors, with or without chemical or biological tanks
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
    • 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)
  • 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 relates to a limit denitrification device for an integrated sewage treatment system, which comprises a shell, a water distributor, an active biological carrier and a bottom water collecting tank, wherein the water distributor, the active biological carrier and the bottom water collecting tank are positioned in the shell, a water inlet pipe and a water outlet pipe are arranged on the shell, the water inlet pipe is connected with the water distributor and a sedimentation area of the integrated sewage treatment system, the water outlet pipe is connected with the bottom water collecting tank and a disinfection area of the integrated sewage treatment system, the water distributor is suitable for uniformly distributing water to the active biological carrier from top to bottom, and the active biological carrier is suitable for enriching and growing autotrophic microorganisms which are used for converting nitrate nitrogen in supernate from the sedimentation area into nitrogen. The method utilizes the active biological carrier, can realize limited denitrification, improve the removal efficiency of total nitrogen, and simultaneously remove phosphorus in water without adding an organic carbon source, thereby saving the cost.

Description

Limit denitrification device for integrated sewage treatment system
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a limit denitrification device with a limit denitrification function for an integrated sewage treatment system.
Background
The process of integrated sewage treatment by using integrated sewage treatment equipment (also called an integrated sewage treatment system) is widely applied to the domestic sewage treatment fields of rural areas, schools, stations, tourist spots, scenic spots, expressway service areas and the like.
At present, the major structure of integration sewage treatment device adopts steel structure integration combination form, inside and outside anticorrosive treatment, and the arrangement mode is buried formula or ground heat preservation formula entirely, and the equipment is inside to be separated portably, and the functional area divides obviously to the plant maintenance is full automatic operation, non-maintaining operation management.
Specifically, as shown in fig. 1, the existing integrated sewage treatment equipment 300 generally comprises an anoxic zone 301, an aerobic zone 302, a settling zone 303 and a disinfection zone 305, and a dephosphorization and dosing system is added according to the requirement of the effluent quality.
The sewage treatment process of the integrated sewage treatment device 300 is as follows:
the sewage after water quantity equalization and water quality equalization in the regulating tank 310 is pumped into the integrated sewage treatment equipment 300 by a water pump, passes through an anoxic zone 301, an aerobic zone 302, a sedimentation zone 303 and a disinfection zone 305 in sequence, and finally reaches the standard and is discharged to a discharge zone 306;
the anoxic zone 301 is internally provided with biological filler, dissolved oxygen is kept at about 0.2mg/L, similar sludge is added for inoculation, facultative microorganisms are attached to the biological filler, macromolecules and refractory organic matters in water are converted into micromolecular and easily degradable organic matters under the action of microbial exoenzymes, and the biodegradability of the water body is improved. Meanwhile, nitrate nitrogen rich in the reflux of the nitrifying liquid is reduced into nitrogen under the action of attached facultative microorganisms, so that the aim of denitrification is fulfilled;
a biological filler and an aeration system are arranged in the aerobic zone 302, dissolved oxygen is kept at about 2.0mg/L, similar sludge is added for inoculation, aerobic microorganisms growing on the biological filler convert organic matters in water into carbon dioxide and water, meanwhile, ammonia nitrogen in the water is converted into nitrate nitrogen under the action of nitrobacteria (belonging to the aerobic microorganisms and growing on the biological filler), and the nitrate nitrogen flows back to the anoxic zone 301 through a nitrifying liquid backflow channel 312 through mixed liquid (referring to the mixture of activated sludge, sewage and charged air in the aeration tank);
the biochemical sewage flows into the settling zone 303 for sludge-water separation, the sludge concentrated at the bottom partially flows back to the anoxic zone through a sludge return channel 313 by a sludge pump (not shown) to maintain the sludge concentration required by the system, and the residual sludge is discharged out of the system. The supernatant fluid flows into a disinfection area, and is discharged after reaching the standard after being added with drugs and disinfected.
The initial COD (Chemical Oxygen Demand) and ammonia nitrogen indexes can meet the limit requirements of national/local emission standards. However, as the emission standard is improved, the total nitrogen index becomes a new assessment index in sewage treatment. The prior removal of the total nitrogen only depends on the reflux of the nitrified liquid to complete the denitrification. Theoretically, the reflux ratio of a large amount of nitrifying liquid can improve the denitrification efficiency, and in the practical application process, the reflux of the mixed liquid can lead to the increase of dissolved oxygen in an anoxic zone, so that the anoxic environment is changed, and the whole system is in an aerobic state. Therefore, the reflux ratio of the nitrified liquid (reflux ratio = reflux flow rate/feed flow rate) can be controlled only to about 200%, and as a result, the theoretical denitrification efficiency of the system is only about 67%, and the total nitrogen removal efficiency is low.
In addition, the removal of the total nitrogen in the sewage is also influenced by the carbon-nitrogen ratio of inlet water, and the removal of the total nitrogen in the water is not influenced when the carbon-nitrogen ratio of the inlet water is (4-6): 1. However, in the case where carbon sources in current sewage are generally insufficient, even a carbon-nitrogen ratio of 1:1 occurs in individual sewage, and denitrification of sewage is greatly limited. Large-scale municipal sewage plants can add carbon sources, such as: sodium acetate, glucose, a composite carbon source and the like are used for improving the condition of carbon-nitrogen ratio imbalance, but the integrated sewage treatment equipment is difficult to accurately control, and meanwhile, the problems of increased operation cost and difficult operation and maintenance are caused.
Disclosure of Invention
In order to overcome the above defects, it would be advantageous to provide a limit denitrification device for an integrated sewage treatment system with a limit denitrification function.
Therefore, the invention provides a limit denitrification device for an integrated sewage treatment system, which comprises a shell, a water distributor, an active biological carrier and a bottom water collecting tank, wherein the water distributor, the active biological carrier and the bottom water collecting tank are positioned in the shell, a water inlet pipe and a water outlet pipe are arranged on the shell, the water inlet pipe is connected with the water distributor and a sedimentation area of the integrated sewage treatment system, the water outlet pipe is connected with the bottom water collecting tank and a disinfection area of the integrated sewage treatment system, the water distributor is arranged to be suitable for uniformly distributing water to the active biological carrier from top to bottom, and the active biological carrier is arranged to be suitable for enriching and growing autotrophic microorganisms for converting nitrate nitrogen in supernate from the sedimentation area into nitrogen.
Furthermore, the limit denitrification device also comprises a backwashing air pipe which is communicated with an external air source and is provided with a valve, the backwashing air pipe is provided with an aeration pipe part which is positioned at the bottom of the active biological carrier, and the aeration pipe part is provided with a plurality of perforations for aeration.
And the limiting denitrification device further comprises a backwashing water drain pipe provided with a valve, and the backwashing water drain pipe is communicated with the bottom water collecting tank and an external regulating tank in front of the integrated sewage treatment system.
In addition, the main components of the active biological carrier are inorganic mineral substances and microbial nutrient salts.
Still further, the main component of the inorganic mineral is calcium carbonate.
Still further, the active biological carrier is a biological calcium active carrier.
Further, the height of the active bio-carrier is controlled to be about 2 m.
Compared with the prior art, the invention has the following advantages:
1) by arranging the limit denitrification device, the defects of iron-sulfur autotrophic denitrification of the integrated sewage treatment system can be overcome, the acid-base balance is realized, and the total nitrogen removal efficiency is further improved;
2) the active biological carrier can provide a fungus growth carrier and an inorganic carbon source, and does not need to add another carbon source, so that the cost is saved, and the COD (chemical oxygen demand) of the effluent is prevented from penetrating (i.e. exceeding the standard);
3) the active biological carrier has strong biological activity and large specific surface area, does not need to be added with drugs, can enrich and proliferate denitrifying microorganisms, and can remove phosphorus in water simultaneously;
4) the active biological carrier has a filtering function, intercepts suspended matters in water and further reduces the concentration of the suspended matters in the effluent;
5) because the water distributor is positioned above the active biological carrier, water is uniformly distributed from top to bottom, so that short flow is effectively avoided, and the denitrification efficiency is improved;
6) because set up backwash air pipe and backwash drain pipe, through regular or aperiodic backwash to avoid filtering the flood peak to improve, improve denitrogenation efficiency.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
Drawings
The technical solution as well as further objects and advantages of the present invention will be better understood by reference to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals identify like elements:
FIG. 1 is a process flow diagram of a conventional integrated wastewater treatment plant;
FIG. 2 is a schematic view illustrating the construction of a limiting denitrification apparatus for an integrated sewage treatment system according to an embodiment of the present invention;
FIG. 3 is a process flow diagram of an integrated wastewater treatment system using the limiting denitrification apparatus shown in FIG. 2;
FIG. 4 is a schematic diagram of denitrification and dephosphorization with active biological carriers.
Detailed Description
The present invention will be described in detail with reference to the following embodiments:
first, the term "limited denitrification" refers to the optimization of denitrification technology to deeply remove nitrate nitrogen in water to achieve the goal of reducing total nitrogen.
FIG. 2 shows a limiting denitrification device 114 for an integrated wastewater treatment system 100 according to one embodiment of the invention. As shown in FIG. 2, and referring to FIG. 3, the extreme denitrification apparatus 100 includes a housing 1, a water distributor 2 located in the housing 1, an active biological carrier 3, and a bottom water collection tank 4. Wherein, a water inlet pipe 13 and a water outlet pipe 15 are arranged on the shell 1, the water inlet pipe 13 is connected with the water distributor 2 and the sedimentation area 103 of the integrated sewage treatment system 100, the water outlet pipe 15 is connected with the bottom water collecting tank 4 and the disinfection area 105 of the integrated sewage treatment system 100, the water distributor 2 is arranged to be suitable for uniformly distributing water to the active biological carrier 3 from top to bottom, and the active biological carrier 3 is arranged to be suitable for enriching and growing autotrophic microorganisms for converting nitrate nitrogen in supernatant liquid from the sedimentation area 103 into nitrogen.
As shown in FIG. 2, the limiting denitrification apparatus 114 further comprises a backwash air pipe 5 communicating with an external air source (not shown) and provided with a valve 50, the backwash air pipe 5 having an aeration pipe portion 52 at the bottom of the active bio-carriers 3, the aeration pipe portion 52 being provided with a plurality of perforations for aeration (not shown). The limited denitrification device 114 also includes a backwash drain 6 having a valve 60 disposed thereon, the backwash drain 6 communicating with the bottom sump 14 and an external surge tank 110 in front of the integrated wastewater treatment system 100.
In the present embodiment, the active bio-carrier 3 is mainly composed of inorganic minerals and microbial nutrient salts, and the active bio-carrier is preferably a bio-calcium active carrier.
Referring to fig. 2 and 3, the operation of the limiting denitrification apparatus 114 will be briefly described:
1) the supernatant from the settling zone 103 enters the water distributor 2 of the limiting denitrification device 114 through the water inlet pipe 13, and the supernatant is uniformly distributed on the active biological carriers 3 through the water distribution of the water distributor 2, so that the formation of short flow is effectively avoided; at this time, the backwash air pipe 5, the valve 50 and the valve 60 at the backwash drain pipe 6 are all in a closed state;
2) the supernatant fluid from the water distributor 2 passes through the active biological carriers 3 from top to bottom, is collected in the bottom water collecting tank 4 of the limit denitrification device 114 and enters the disinfection area 105 through the water outlet pipe 15;
3) when the system needs backwashing, a valve 50 of a backwashing air pipe 5 is opened, the active biological carrier 3 is pneumatically stirred to be loosened, and a biological membrane and sludge on the active biological carrier 3 fall off; and after 3-5 min, closing the valve 50 of the backwashing air pipe 5, opening the valve 60 of the backwashing water discharge pipe 6, and closing the valve 60 on the backwashing water discharge pipe 6 when the liquid level does not fall any more.
As shown in fig. 3, and referring to fig. 2, an integrated sewage treatment system 100 according to an embodiment of the present invention includes an anoxic zone 101, an aerobic zone 102, a settling zone 103, a limited denitrification zone 104, and a disinfection zone 105, which are sequentially communicated, wherein the anoxic zone 101 is disposed to communicate with an external regulation tank 110, and a nitrified liquid reflux channel 112 is disposed between the aerobic zone 102 and the anoxic zone 101; a sludge return channel 113 is arranged between the sedimentation zone 103 and the anoxic zone 101; the limited denitrification zone 104 is provided with a limited denitrification device 114.
It will be appreciated that the anoxic zone 101 is provided with a biological filler (not shown) suitable for growing facultative microorganisms; aerobic zone 102 is provided with a biological packing and aeration system (not shown) suitable for growing aerobic microorganisms.
It should be noted that, since the limited denitrification area 104 is connected in series after the precipitation area 103 and before the disinfection area 105, the supernatant produced in the precipitation area 103 flows through the active biological carriers 3 (the height of the active biological carriers can be controlled to be about 2 m) in the limited denitrification area 104 from top to bottom, and is collected at the bottom in the form of the bottom water collection tank 4. Nitrate nitrogen contained in the supernatant is converted into nitrogen under the action of autotrophic microorganisms enriched on the active biological carrier 3 and removed from the water. After a certain time, the filtration head is increased (i.e. the loss of the filtration head is increased) by the microbial film generated on the surface of the active biological carrier 3 and the suspended matters generated in the interception and precipitation area, at this time, the aeration pipe part 52 at the bottom of the active biological carrier 3 and the valve 60 on the backwashing water discharge pipe 6 are opened, and the water after air washing (i.e. backwashing) is discharged into the regulating tank 110 at the front end, so that backwashing can be completed.
In addition, after the reduction of the biological carriers 3 with denitrification, the biological carriers are periodically supplemented.
Referring now to fig. 2 and 3, an integrated wastewater treatment process of the integrated wastewater treatment system 100 according to the present embodiment will be described, which includes the following steps:
s1: the sewage is pumped into the integrated sewage treatment system 100 after the first treatment of water quantity equalization and water quality equalization in the regulating tank 110;
s2: the sewage after the first treatment firstly enters an anoxic zone 101 of an integrated sewage treatment system 100 for biodegradation and denitrification;
specifically, a biological filler is arranged in the anoxic zone 101, and the facultative microorganisms growing on the biological filler are utilized to convert macromolecules and refractory organics in the sewage after the first treatment into micromolecular and easily degradable organics;
s2: the sewage after biodegradation comes out from the anoxic zone 101 and then enters the aerobic zone 102 of the integrated sewage treatment system 100 to carry out biochemical reaction, organic matters in the sewage are converted into carbon dioxide and water, ammonia nitrogen in the sewage is converted into nitrate nitrogen, and the sewage after biochemical reaction enters the sedimentation zone 103 of the integrated sewage treatment system 100 while the nitrate nitrogen flows back to the anoxic zone 101 through a mixed solution (flows back through a nitrification solution return channel 112);
specifically, a biological filler and an aeration system are arranged in the aerobic zone 102, and aerobic microorganisms growing on the biological filler are utilized to convert organic matters in the sewage after biodegradation into carbon dioxide and water, and simultaneously convert ammonia nitrogen in the sewage into nitrate nitrogen;
s3: after biochemical sewage is subjected to sludge-water separation in the settling zone 103, a sludge part flows back (flows back through a sludge return channel 113) to the anoxic zone 101 to maintain the sludge concentration of the system, residual sludge is discharged out of the system (not shown in fig. 2), and meanwhile, supernatant enters a limit denitrification zone 104 of the integrated sewage treatment system 100;
in step S3, after the biochemical sewage is precipitated in the precipitation zone 103 for about 2 hours, the dissolved oxygen in the water is almost zero, mainly nitrate nitrogen;
s4: the limit denitrification area 104 carries out limit denitrification on the supernatant by using the active biological carrier 3, and the sewage after the limit denitrification enters a disinfection area 105 of the integrated sewage treatment system 100;
in the step S4, in the limited denitrification area 104, the limited denitrification is performed by adding the active biological carrier 3 for limited denitrification, the main components of the active biological carrier 3 are inorganic minerals and microbial nutrient salts, and a plurality of trace elements suitable for the adsorption and growth of microorganisms are fused to provide the living environment for autotrophic microorganisms, and the denitrification is realized by autotrophic denitrification;
specifically, the autotrophic microorganisms utilize inorganic carbon in water as a carbon source, inorganic mineral substances (calcium carbonate as a main component) in the active biological carrier 3 as an electron donor, and reduce nitrate nitrogen into nitrogen to realize the purpose of denitrification;
s5: the sewage after the limited denitrification is treated with medicine addition and disinfection in the disinfection area 105 and then is discharged after reaching the standard.
In this embodiment, the biological calcium active carrier is used as the active biological carrier 3, and the sulfur and iron autotrophic denitrification bacteria supported on the biological calcium active carrier use the reduced sulfur and elemental iron in the supernatant as electron donors and NO as the electron donors under the anoxic or anaerobic condition of the limited denitrification region 104 3 – N is an electron acceptor, and the autotrophic denitrification is realized by reducing the N into nitrogen, as shown in figure 4, the specific reaction formula is as follows:
1.1S 0 +NO 3 – +0.76H 2 O+0.4CO 2 +0.08NH 4 + →0.5N 2 +1.10SO 4 2- +1.28H + +0.08C 5 H 7 O 2 N
5Fe 0 +2NO 3 – +6H 2 O→5Fe 2+ +N 2 +12OH –
2H + +CaCO 3 →Ca 2+ +CO 2 +H 2 O
while the invention has been described with respect to the foregoing technical disclosure and features, it will be understood that various changes and modifications in the above structure, including combinations of features disclosed herein either individually or as claimed, and obviously including other combinations of such features, may be resorted to by those skilled in the art, without departing from the spirit of the invention. Such variations and/or combinations are within the skill of the art to which the invention pertains and are within the scope of the following claims.

Claims (7)

1. The shell is provided with a water inlet pipe and a water outlet pipe, the water inlet pipe is connected with the water distributor and a sedimentation area of the integrated sewage treatment system, the water outlet pipe is connected with the bottom water collection tank and a disinfection area of the integrated sewage treatment system, the water distributor is suitable for uniformly distributing water to the active biological carriers from top to bottom, and the active biological carriers are suitable for enriching and growing autotrophic microorganisms which are used for converting nitrate nitrogen in supernate from the sedimentation area into nitrogen.
2. The integrated limited denitrification device for sewage treatment system of claim 1, further comprising a backwash air pipe connected to an external air source and having a valve provided thereon, the backwash air pipe having an aeration pipe portion at the bottom of the active bio-carriers, the aeration pipe portion being provided with a plurality of perforations for aeration.
3. The integrated sewage treatment system limiting denitrification device according to claim 2, further comprising a backwash drain pipe having a valve provided thereon, the backwash drain pipe communicating with the bottom sump and an external surge tank in front of the integrated sewage treatment system.
4. The integrated sewage treatment system limit denitrification apparatus according to any one of claims 1 to 3, wherein the main components of the active biological carrier are inorganic minerals and microbial nutritive salts.
5. The integrated sewage treatment system limit denitrification apparatus according to claim 4, wherein the inorganic mineral is calcium carbonate as a main component.
6. The integrated limited denitrification device for sewage treatment system of claim 4, wherein the active bio-carrier is a bio-calcium active carrier.
7. The integrated sewage treatment system limiting denitrification apparatus according to claim 6, wherein the height of the active bio-carriers is controlled to 2 m.
CN202210392353.5A 2022-04-15 2022-04-15 Limit denitrification device for integrated sewage treatment system Pending CN114873841A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114873843A (en) * 2022-04-15 2022-08-09 山东招金膜天股份有限公司 Integrated sewage treatment process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114873843A (en) * 2022-04-15 2022-08-09 山东招金膜天股份有限公司 Integrated sewage treatment process
CN114873843B (en) * 2022-04-15 2023-08-04 山东招金膜天股份有限公司 Integrated sewage treatment process

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