CN112830628A - Domestic sewage treatment process - Google Patents
Domestic sewage treatment process Download PDFInfo
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- CN112830628A CN112830628A CN202011637700.3A CN202011637700A CN112830628A CN 112830628 A CN112830628 A CN 112830628A CN 202011637700 A CN202011637700 A CN 202011637700A CN 112830628 A CN112830628 A CN 112830628A
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- 239000010865 sewage Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 24
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000004062 sedimentation Methods 0.000 claims abstract description 25
- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001556 precipitation Methods 0.000 claims abstract description 5
- 238000011045 prefiltration Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000010802 sludge Substances 0.000 claims description 17
- 239000000945 filler Substances 0.000 claims description 15
- 238000005273 aeration Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000004659 sterilization and disinfection Methods 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 239000000725 suspension Substances 0.000 description 4
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 241000700605 Viruses Species 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000032770 biofilm formation Effects 0.000 description 2
- 238000004332 deodorization Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 208000035473 Communicable disease Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000249 desinfective effect 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
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Images
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
- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2101/105—Phosphorus compounds
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- 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
- C02F2209/11—Turbidity
-
- 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
- C02F2209/16—Total nitrogen (tkN-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
-
- 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
- C02F2303/02—Odour removal or prevention of malodour
-
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
-
- 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
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- 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
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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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- 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)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a domestic sewage treatment process, which comprises the following steps: s1, carrying out pre-filtration and pre-precipitation treatment on the domestic sewage; s2, carrying out MBBR treatment on the sewage treated by the S1; s3, carrying out secondary sedimentation treatment on the sewage treated by the S3; s4 is discharged after the sewage treated by the S4 is treated by ozone. The treatment process is convenient and efficient, the maintenance and use cost is low, and the application range is wide.
Description
Technical Field
The invention relates to the technical field of domestic sewage treatment processes, in particular to a sewage treatment method based on a moving bed biofilm reactor.
Background
With the development of social economy and the increasing improvement of the living standard of people, a large amount of domestic sewage is discharged, the water environment is deteriorated, and the people's life is directly influenced. Domestic sewage mainly contains a large amount of organic matters and protozoic organisms, and the sewage is directly discharged into the external environment, so that natural water is polluted, eutrophication of the water can be formed when the self-purification capacity of the water is exceeded, and the water can smell gradually. For the black and odorous water body, besides the water quality and the self-purification capacity are irreversibly damaged, the biological community in the water body can be changed, and the use function and the value of the water body are greatly reduced. Meanwhile, bacteria and the like in the domestic sewage can propagate in a large quantity, and even can cause the spread of infectious diseases.
Aiming at the current water environment problem, a domestic sewage treatment process is developed, the content of COD, ammonia nitrogen and the like in the domestic sewage is mainly reduced, the peculiar smell of a water body is eliminated, sterilization and disinfection are carried out, and the water quality of the water body is improved.
Disclosure of Invention
The invention aims to provide a domestic sewage treatment process.
The problems to be solved by the invention are as follows: eliminating black and odorous water body caused by domestic sewage and improving the water quality of the water body.
The technical scheme of the invention is as follows: a domestic sewage treatment process is an integrated treatment process of a collection grid, an inclined plate sedimentation tank, an MBBR tank, a secondary sedimentation tank and an ozone chamber.
Specifically, the domestic sewage treatment process comprises the following steps:
s1, carrying out pre-filtration and pre-precipitation treatment on the domestic sewage;
s2, carrying out MBBR treatment on the sewage treated by the S1;
s3, carrying out secondary sedimentation treatment on the sewage treated by the S3;
s4 is discharged after the sewage treated by the S4 is treated by ozone.
Furthermore, the pre-filtration treatment adopts a multi-layer grating plate for treatment, and the garbage and large particles in the sewage are intercepted; the pre-precipitation treatment adopts an inclined plate sedimentation tank for treatment, suspended matters and silt are deposited to a mud collecting hopper at the bottom of the inclined plate sedimentation tank through an inclined plate, and sewage overflows from the upper part and enters the next treatment step.
Furthermore, the grid is a fine grid, sewage is lifted by a sewage lifting pump and passes through the fine grid, larger particle suspended matters and particles in the sewage are removed, the treatment load of a subsequent water treatment process is reduced, and then the sewage overflows and enters the inclined plate sedimentation tank.
Further, the MBBR treatment in step S2 is performed by combining a suspensible carrier filler and a bottom aeration pipe network, and the water flow enters the next treatment step by means of overflow. The suspended carrier filler in the MBBR step can be fully contacted with sewage after being in a vulcanization state through aeration, microorganisms are in a three-phase growth environment, at the moment, anaerobic bacteria and facultative anaerobic bacteria in the carrier grow, and aerobic bacteria outside the carrier grow, so that each carrier forms a micro-reactor, and nitrification and denitrification reactions exist simultaneously. The sludge age of the sludge growing in a suspension manner is relatively short, the sludge load is low, organic matters can be effectively removed, the suspension filler is continuously washed by water flow and air flow, the activity of a biological membrane is ensured, and the sludge bulking is reduced. The suspended filler has a large specific surface area, a plurality of biological species are attached to the carrier, the removal efficiency of organic matters is greatly improved, and then the sewage enters secondary sedimentation treatment through overflow.
Further, the secondary sedimentation treatment in the step S3 adopts a sedimentation tank with a sludge hopper at the bottom, at least a part of sludge in the sludge hopper is returned to the MBBR reaction tank for recycling, and the settled clean water enters the next treatment step through an overflow pipe above the tank body.
Further, S4 adopts closed ozone cabin to carry out ozone treatment, is equipped with the ozone dispersion impeller below the ozone cabin, and inside ozone generator directly squeezed into the water with ozone, ozone decomposes and generates new ecological oxygen atom, forms the hydroxyl radical that has strong oxidizing property in aqueous, carries out effects such as disinfecting, disinfection, deodorization to the water, and the hydroxyl radical still can destroy the organic matter structure, reaches the effect of degradation water COD, ammonia nitrogen, total phosphorus, promotes water transparency, purifies the water.
Further, the suspensible carrier filler in S2 adopts a cylindrical polypropylene filler, the cylindrical inner space is provided with a plurality of regular hexagonal honeycomb structures penetrating through the cylindrical structure, and the ratio of the height to the diameter of the cylinder is (1-1.5): 1.
the treatment process has the advantages of simplicity, convenience and high efficiency:
1. aiming at the characteristic that domestic sewage and garbage are numerous and complex, the pre-filtering and pre-precipitating treatment is adopted, so that large particles and garbage can be removed, and the treatment efficiency of subsequent treatment steps is improved.
2. Aiming at the characteristic of complex domestic sewage pollutants, the MBBR process is adopted, biological biofilm formation is formed by combining with biological fillers, and the ozone treatment step is adopted, so that organic matters, inorganic matters and bacterial viruses in the domestic sewage can be subjected to advanced treatment, and the water body can meet the purification requirement.
3. Various treatment steps are combined, but complex processes such as chemical treatment and the like are omitted, so that the application scene and range are greatly improved, and the method can be used in undeveloped areas such as villages, towns and the like.
Description of the drawings:
FIG. 1 is a schematic overall flow diagram of the process.
Detailed Description
In order to better show the technical means and features of the invention, the invention is further described below with reference to specific embodiments.
The invention is suitable for the water body treatment of domestic sewage in cities and towns, villages and industrial residential areas.
As shown in the figure, the domestic sewage treatment process specifically comprises the following steps:
s1, pumping domestic sewage into a grid pool 1 by a sewage pump for pre-filtering, wherein the grid pool adopts 2 groups of stainless steel coarse grids and 2 groups of fine grids for multi-group treatment, the aperture of the coarse grids is 5cm, the aperture of the fine grids is 2cm, and garbage can be effectively intercepted; then the sewage enters an inclined plate sedimentation tank 2 for pre-sedimentation treatment, a sludge collecting hopper is arranged at the bottom of the inclined plate sedimentation tank, and the pre-precipitated sewage enters the next treatment step through an overflow plate at the upper right of the inclined plate sedimentation tank 2;
s2 gets into MBBR reaction tank 3 through the sewage of 2 overflows of inclined plate sedimentation tank and handles, but adopts the mode that suspension carrier filler 6 and bottom aeration pipe network combined together to handle in the MBBR processing, but suspension carrier filler adopts cylindrical polypropylene to pack, and cylindrical inner space is provided with a plurality of regular hexagon honeycomb structures that run through the cylinder structure, cylindrical height is 1 with the diameter ratio: 1, an air blower is externally connected to a bottom aeration pipe network to perform air-blowing treatment on a water body, so that a filler is in a suspended state, is fully mixed, contacted and reacted with sewage, and performs biological treatment on the water body by utilizing a biological film generated by film hanging on the surface of the filler, thereby achieving the purpose of purifying water quality;
s3, the sewage after being treated by S3 enters a secondary sedimentation tank 4 for secondary sedimentation treatment, a flow baffle is arranged at the inlet of the secondary sedimentation tank 4, a sludge accumulation funnel is arranged at the bottom of the secondary sedimentation tank, half of the sludge in the sludge funnel flows back to an MBBR reaction tank through a sludge return pump for recycling, and because part of the sludge is activated sludge and biological membranes which fall off from a suspensible carrier filler 6, the clear water after sedimentation enters the next treatment step through an overflow pipe above the tank body.
The mud after MBBR handles gets into ozone cabin 5 and carries out ozone sterilization virus killing treatment, adopts closed ozone cabin to carry out ozone treatment, is equipped with the ozone dispersion impeller below the ozone cabin, directly squeezes into the water through ozone generator inside with ozone, and ozone decomposition generates new ecological oxygen atom, forms the hydroxyl radical that has strong oxidizing property in aqueous, disinfects, effects such as disinfection, deodorization to the water, and the clear water after the processing directly discharges in outside waters.
In the embodiment, the domestic sewage nearby is treated in a centralized manner at an artificial river channel in suburb areas of Jiangsu province, MBBR is firstly subjected to filler biofilm formation for 10 days, and then the stable operation is gradually carried out.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A domestic sewage treatment process is characterized by comprising the following steps:
s1, carrying out pre-filtration and pre-precipitation treatment on the domestic sewage;
s2, carrying out MBBR treatment on the sewage treated by the S1;
s3, carrying out secondary sedimentation treatment on the sewage treated by the S3;
s4 is discharged after the sewage treated by the S4 is treated by ozone.
2. The domestic sewage treatment process according to claim 1, wherein: the pre-filtration treatment adopts a plurality of layers of grating plates to intercept garbage and large particles in the sewage; the pre-precipitation treatment adopts an inclined plate sedimentation tank for treatment, suspended matters and silt are deposited to a mud collecting hopper at the bottom of the inclined plate sedimentation tank through an inclined plate, and sewage overflows from the upper part and enters the next treatment step.
3. The domestic sewage treatment process according to claim 1, wherein: the MBBR treatment in the step S2 adopts a mode of combining suspensible carrier filling with a bottom aeration pipe network for treatment, and water flow enters the next treatment step in an overflow mode.
4. The domestic sewage treatment process according to claim 1, wherein: and S3, adopting a sedimentation tank with a sludge accumulation funnel at the bottom for secondary sedimentation treatment, returning at least a part of sludge in the sludge accumulation funnel to the MBBR reaction tank for recycling, and allowing the settled clear water to enter the next treatment step through an overflow pipe above the tank body.
5. The domestic sewage treatment process according to claim 1, wherein: s4 adopts closed ozone cabin to carry out ozone treatment, is equipped with the ozone dispersion impeller below the ozone cabin, with inside ozone dispersion income water, to the disinfection and isolation effect of water, further promotes quality of water.
6. The domestic sewage treatment process according to claim 1, wherein: the suspensible carrier filler in the S2 adopts a cylindrical polypropylene filler, a cylindrical inner space is provided with a plurality of regular hexagonal honeycomb structures penetrating through a cylindrical structure, and the ratio of the height to the diameter of the cylinder is (1-1.5): 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011637700.3A CN112830628A (en) | 2020-12-31 | 2020-12-31 | Domestic sewage treatment process |
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| CN202011637700.3A CN112830628A (en) | 2020-12-31 | 2020-12-31 | Domestic sewage treatment process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117326693A (en) * | 2023-09-15 | 2024-01-02 | 成都理工大学 | A decentralized domestic sewage treatment system |
| WO2026000050A1 (en) * | 2024-06-26 | 2026-01-02 | Minitrat Industria Comercio E Servico Ltda | Compact sewage treatment plant and method for treating sewage |
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| CN112028381A (en) * | 2020-05-27 | 2020-12-04 | 中电环保股份有限公司 | CBS- (II) type combined system and process for low-concentration sewage |
| CN111847771A (en) * | 2020-07-06 | 2020-10-30 | 浙江省环境工程有限公司 | Slaughter wastewater treatment method and system |
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| CN117326693A (en) * | 2023-09-15 | 2024-01-02 | 成都理工大学 | A decentralized domestic sewage treatment system |
| WO2026000050A1 (en) * | 2024-06-26 | 2026-01-02 | Minitrat Industria Comercio E Servico Ltda | Compact sewage treatment plant and method for treating sewage |
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Application publication date: 20210525 |