CN115231696B - Method for quickly starting shortcut nitrification - Google Patents
Method for quickly starting shortcut nitrification Download PDFInfo
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- CN115231696B CN115231696B CN202210865801.9A CN202210865801A CN115231696B CN 115231696 B CN115231696 B CN 115231696B CN 202210865801 A CN202210865801 A CN 202210865801A CN 115231696 B CN115231696 B CN 115231696B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005273 aeration Methods 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002351 wastewater Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 244000005700 microbiome Species 0.000 claims description 2
- 241000894006 Bacteria Species 0.000 abstract description 9
- 238000009825 accumulation Methods 0.000 abstract description 7
- 239000010865 sewage Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010842 industrial wastewater Substances 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract description 2
- 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 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 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 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000002572 peristaltic effect Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000006396 nitration reaction Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 101100408454 Arabidopsis thaliana PLC6 gene Proteins 0.000 description 2
- 101100408456 Arabidopsis thaliana PLC8 gene Proteins 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- 241001453382 Nitrosomonadales Species 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 230000009935 nitrosation Effects 0.000 description 2
- 238000007034 nitrosation reaction Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
-
- 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- 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
- C02F2101/166—Nitrites
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
-
- 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)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention particularly relates to a method for quickly starting shortcut nitrification, which is suitable for treating various industrial wastewater containing ammonia nitrogen and domestic sewage by changing the structure of a reactor and optimizing process parameters to form a dissolved oxygen concentration gradient difference and quickly starting shortcut nitrification. The invention divides the reactor into two spaces through the baffle plate in the reactor, the aeration area and the non-aeration area, realizes that the dissolved oxygen concentration is matched with the ammonia nitrogen concentration, meets the ammonia nitrogen consumption requirement in the high ammonia nitrogen concentration area, gradually reduces the ammonia nitrogen concentration along with the water flow direction, regularly changes the dissolved oxygen concentration in the inflow process of the inflow water in the reactor from high to low, reduces the activity of NOB bacteria under the condition that the activity of the AOB bacteria is unchanged, and ensures that NO in the outflow water is reduced 2 ─ Higher accumulation of N. The automatic control device can regulate and control the operation of the reactor according to the concentration of dissolved oxygen, is efficient, avoids the addition of other medicaments, reduces the cost and has higher application value.
Description
Technical Field
The invention belongs to the field of water treatment application, and particularly relates to a method for realizing short-cut nitrification, which is mainly used for conveniently and rapidly realizing short-cut nitrification by adjusting the structure of a reactor, removing ammonia nitrogen in water in a more economic way and is suitable for treating various industrial wastewater containing ammonia nitrogen and domestic sewage.
Background
With the development of social economy and science and technology, nitrogen pollutants are one of the main reasons for water pollution and eutrophication, so that the removal of nitrogen in water is of great significance for cleaning the water.
It is generally believed that biological denitrification is performed by both nitrification and denitrification processes, with nitrification being accomplished primarily by nitrifying bacteria. Nitrifying bacteria include two physiological flora of ammonia oxidizing bacteria (Ammonia Oxidizing Bacteria, AOB) and nitrite oxidizing bacteria (Nitrite Oxidizing Bacteria, NOB). Wherein AOB is the oxidation of ammonia nitrogen to nitrite nitrogen and NOB is the conversion of nitrite nitrogen to nitrate nitrogen. In recent years, short-cut nitrification technology has become a research hotspot, and the core of the short-cut nitrification technology is to control ammonia oxidation in a nitrosation stage, and directly enter a subsequent denitrification. Compared with the whole-process nitrification and denitrification (ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, nitrite nitrogen and nitrogen), the short-range nitrification and denitrification (ammonia nitrogen, nitrite nitrogen and nitrogen) has the characteristics of small aeration and small carbon source addition, can greatly reduce the operation cost, saves the water treatment cost, and is worthy of engineering application and popularization. However, short-cut nitrification is complicated to control, the nitrosation rate is low, and stable operation is difficult. Therefore, how to increase the accumulation of nitrite nitrogen and ensure stable and efficient short-cut nitrification is a key factor for restricting the short-cut nitrification and denitrification process.
The MBBR (moving bed biofilm reactor) moving bed biomembrane reactor has the characteristics of small occupied area, low mud production rate and stable performance, and the filler has higher tolerance and long service life and is beneficial to industrial popularization. Therefore, the shortcut nitrification is started in the MBBR technology, the stability and the high efficiency are realized for biological denitrification, and a solid foundation is laid for saving investment and simple operation.
The invention aims to provide a method for realizing short-cut nitrification, which can realize stable short-cut nitrification efficiently and conveniently, can specifically culture AOB and inhibit NOB, achieves the aim of low cost and high denitrification efficiency, and can be applied to various industrial wastewater containing ammonia nitrogen and production and domestic sewage.
Disclosure of Invention
Aiming at the problems of complex operation, unstable operation, low nitrite nitrogen accumulation rate and the like of the conventional short-cut nitrification process, the invention provides a new idea by combining the background technology, and the main contents are as follows: a method for quickly starting short-cut nitrification.
The technical scheme of the invention is as follows:
the invention provides a method for quickly starting shortcut nitrification, which comprises the steps of firstly coating a filler, and after coating, forming a dissolved oxygen concentration gradient difference by changing the structure of a reactor and optimizing process parameters. The baffle plate arranged in the reactor divides the reactor into an aeration zone and a non-aeration zone, namely a high dissolved oxygen concentration zone and a low dissolved oxygen concentration zone.
The aeration zone of the reactor adopts a bottom aeration method, the wastewater containing ammonia and nitrogen enters the reactor, the liquid level of the aeration zone rises under the action of gas stripping, and water overflows to a non-aeration zone to form internal circulation. And is discharged from the water outlet pipe after the action of microorganisms.
The baffle can be moved left and right, and the position of the baffle is regulated and controlled according to the dissolved oxygen concentration detected by the PLC, so that a dissolved oxygen concentration gradient difference is formed.
The concentration of dissolved oxygen at the liquid level on the non-aeration area is 1.5-3.5 mg/L, and the concentration of dissolved oxygen at the low liquid level is 0.2-1.0 mg/L.
The baffle moving range comprises: 3-7 cm away from the bottom of the reactor and 10-15-cm away from the top of the reactor.
The wastewater containing ammonia and nitrogen is characterized in that the ammonia nitrogen concentration is 50-450 mg/L, and the COD value is 50-1000 mg/L.
The height of the water outlet pipe is consistent with the height of the liquid level of the non-aeration area.
The reactor is filled with filler, the filling ratio of the filler is 20-50%, and the specific surface area is 300-800m 2 /m 3 。
The dissolved oxygen concentration gradually decreases along with the water flow direction in the whole process. The dissolved oxygen concentration in the aeration area is high, the ammonia nitrogen consumption requirement is met, the ammonia nitrogen concentration in the water flow direction is gradually reduced, the dissolved oxygen concentration is also reduced, the nitrite nitrogen is prevented from being further converted into nitrate nitrogen, the accumulation of the nitrite nitrogen is realized, and the aeration energy consumption is reduced.
The filler film is formed by taking activated sludge of a secondary sedimentation tank of a municipal sewage plant as inoculation mud, and the reactor is operated for 10-15 days to complete film forming, and the ammonia nitrogen removal load of the reactor after stable operation is 0.2-0.5 Kg N/m 3 /d。
The operation parameters are as follows: regulating the pH value to 7.5-8.0 by using a 1% NaOH or HCl solution; controlling the water temperature in the reactor to be 30-35 ℃ through a heating device; the concentration of the dissolved oxygen on the liquid level of the non-aeration zone is that of the inventionIs characterized in that: compared with the traditional reactor which adopts a single chamber for short-range nitrification, the invention divides the reactor into an aeration zone and a non-aeration zone through the baffle plate in the reactor, has large aeration quantity in the zone with high ammonia nitrogen concentration, meets the ammonia nitrogen consumption requirement, gradually reduces the ammonia nitrogen concentration along with the water flow direction, reduces the dissolved oxygen concentration, and realizes the matching of the dissolved oxygen concentration and the ammonia nitrogen concentration. In addition, the baffle is movable, and the dissolved oxygen and ammonia nitrogen concentration in the two areas can be controlled by changing the space size of the aeration area and the non-aeration area through changing the position of the baffle, so that ammonia nitrogen wastewater with different concentrations can be treated. Different from the traditional bottom aeration mode, the invention adopts single-side aeration, has the stripping effect while meeting the oxygen demand of the AOB bacteria, promotes the internal circulation of the reactor, reduces the aeration energy consumption and saves the cost. The method of single-side aeration stripping reduces the influence of water conservancy fluctuation caused by aeration on the filling material, and can avoid falling of the biological film. The dissolved oxygen concentration of the inflow water in the flowing process of the reactor is regularly changed from high to low, and under the condition that the activity of the AOB bacteria is unchanged, the activity of NOB bacteria is reduced, so that NO in the outflow water 2 - N has a high accumulation rate. The automatic control device can regulate and control the operation of the reactor according to the concentration of dissolved oxygen, is efficient, avoids the addition of other medicaments, reduces the cost and has higher application value.
Drawings
FIG. 1 is a diagram of a rapid start short-cut nitrification reactor
Reference numerals
1-water storage tank, 2-peristaltic pump, 3-reactor, 4-baffle, 5-filler, 6-pH meter probe, 7-heating probe, 8-PLC (Programmable Logic Controller ), 9-acid liquor, 10-alkali liquor, 11-water outlet, 12-water outlet pipe, 13-dissolved oxygen probe, 14-mud discharging port, 15-aeration head, 16-aeration zone and 17-non-aeration zone.
Detailed Description
The invention is further illustrated by way of example with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a rapid start short-cut nitration reaction apparatus.
The process operation flow is described as follows:
description of the reactor operation flow: the simulated wastewater 1 enters the bottom of an aeration zone 16 of the reactor through a peristaltic pump 2, the liquid upwards flows through a baffle plate 4 to overflow to a non-aeration zone 17 under the action of hydraulic force through aeration, and the dissolved oxygen continues to gradually decrease under the flowing state. Detecting the pH value change in the reactor through a pH probe 6, and when the pH value is lower than 7.5, starting a peristaltic pump by the PLC8 to add alkali 10; when the upper liquid level dissolved oxygen is higher, the PLC8 is started, the baffle plate 4 moves to the aeration zone 16, and conversely, moves to the non-aeration zone 17. And (5) discharging sludge according to the condition of the peeled sludge at the bottom of the reactor.
Example 1
The reactor of the invention is utilized to treat high ammonia nitrogen wastewater of a certain fertilizer plant, and the water quality NH to be treated 4 -N is 450mg/L, COD 200 mg/L and NaHCO 3 3900 mg/L, pH of the inlet water is 8.5. The reactor had a total volume of 10L (12.5 x 20 x 40 cm), an aeration zone effective volume of 2.5L, a baffle height of 30 cm, a distance of 5cm from the bottom, a packing filling ratio of 30%, a HRT of 24 h, and a short-cut nitrification started over 18 days, and the results of the reactor after steady operation are shown in table 1;
TABLE 1 detection results of example 1
Example 2
The reactor of the invention is used for treating domestic sewage in certain city, and the treated water quality is characterized in that: ammonia nitrogen is 79 mg/L, COD is 250mg/L, nitrate nitrogen is 3 mg/L, nitrite nitrogen is 0.5 mg/L, and pH value is 7.5; waste water enters the bottom of the reactor through a peristaltic pump, the total volume of the reactor is 10L (12.5 x 20 x 40 cm), the effective volume of an aeration zone is 2.5L, the baffle height is 30 cm, the distance from the bottom is 5cm, the filling ratio of the filling is 30%, the HRT is 6 h, short-range nitration is started for 21 days, and the result of the reactor after stable operation is shown in table 2;
TABLE 2 detection results of example 2
Example 3
The reactor of the invention is used for treating certain medical wastewater, and the treated water quality is characterized in that: ammonia nitrogen is 250mg/L, COD is 200 mg/L, nitrate nitrogen is 150 mg/L, nitrite nitrogen is 42 mg/L, and pH value is 5.5; waste water enters the bottom of the reactor through a peristaltic pump, the total volume of the reactor is 10L (12.5 x 20 x 40 cm), the effective volume of an aeration zone is 2.5L, the baffle height is 30 cm, the distance from the bottom is 5cm, the filling ratio of the filling is 30%, the HRT is 16 h, short-range nitration is started within 19 days, and the result of the reactor after stable operation is shown in table 3;
TABLE 3 detection results of example 3
In the embodiment, the reactor disclosed by the invention is used for respectively treating chemical fertilizer wastewater, domestic sewage and medical wastewater, and experimental results show that the reactor has higher nitrite nitrogen accumulation rate, and the nitrite nitrogen accumulation rate exceeds 80% after 21 days of operation, so that the reactor designed by the invention can rapidly realize short-cut nitrification, has higher engineering utilization value, is suitable for various ammonia nitrogen wastewater, and has universal applicability.
Claims (4)
1. A method for quickly starting shortcut nitrification is characterized in that: the reactor is divided into an aeration zone (16) and a non-aeration zone (17) by a baffle plate (4) arranged in the reactor (3), the aeration zone (16) adopts a bottom aeration method, the ammonia nitrogen-containing wastewater (1) enters the reactor (3), the liquid level rises under the stripping action, the water overflows to the non-aeration zone (17) to form internal circulation, and the water is discharged from a water outlet pipe (12) after the action of microorganisms;
the baffle (4) can move left and right, and the position of the baffle (4) is regulated and controlled according to the dissolved oxygen concentration monitored by the PLC (8), so that a dissolved oxygen concentration gradient difference is formed;
the ammonia nitrogen concentration of the wastewater (1) is 79-450mg/L, and the COD value is 50-250mg/L;
the concentration of dissolved oxygen at the liquid level on the non-aeration zone (17) is 1.5-3.5 mg/L, and the concentration of dissolved oxygen at the low liquid level is 0.2-1.0 mg/L.
2. A method for rapid start-up shortcut nitrification apparatus according to claim 1, wherein: the movement range of the baffle (4) comprises: 3-7 cm away from the bottom of the reactor (3), 10-15cm away from the top of the reactor (3).
3. A method for rapid start-up shortcut nitrification apparatus according to claim 1, wherein: the height of the water outlet pipe (12) is consistent with the liquid level of the non-aeration zone (17).
4. A method for rapid start-up shortcut nitrification apparatus according to claim 1, wherein: the reactor (3) is internally filled with a filler (5), the filling ratio of the filler (5) is 20-50%, and the specific surface area is 300-800m 2 /m 3 。
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| CN209178188U (en) * | 2018-10-18 | 2019-07-30 | 嘉兴市六承环保科技有限公司 | A kind of anaerobic-aerobic-precipitation integral sewage-treatment plant |
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