CN107311314A - A kind of method of black-odor riverway restoration of the ecosystem in situ - Google Patents

A kind of method of black-odor riverway restoration of the ecosystem in situ Download PDF

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CN107311314A
CN107311314A CN201710545304.XA CN201710545304A CN107311314A CN 107311314 A CN107311314 A CN 107311314A CN 201710545304 A CN201710545304 A CN 201710545304A CN 107311314 A CN107311314 A CN 107311314A
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water
black
ecosystem
microorganism
target
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CN107311314B (en
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田城德
陶正
张文章
翁晓红
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Shanghai Amoy Tian Agricultural Biotechnology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/02Biological treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C02F3/347Use of yeasts or fungi
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00Aeration of stretches of water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B1/00Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B3/00Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/007Contaminated open waterways, rivers, lakes or ponds
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/40Protecting water resources
    • Y02A20/402River restoration
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

A kind of method of black-odor riverway restoration of the ecosystem in situ disclosed by the invention, comprises the following steps:(1) target river bed sludge is turned over using giant punching, river sludge is suspended in water body;(2) during step (1) progress, microorganism formulation is delivered into target water body, water ecology system is set up, water pollutant of degrading carries out mud decrement and purified water;(3) Dissolved Oxygen in Water content and redox organic pollution are improved using nanometer aeration;(4) step (3) one is completed to two days later, plant chinampa is set in target water, the nutriment of plant absorption microorganism conversion on plant chinampa, while being interacted with the photosynthetic function of microorganism, sets up and safeguards water-bed ecological water quality purification.Cost of investment of the present invention is low, simple to operate, safeguards facility, and stable treatment effect, its ecosystem for administering waters safeguards reliable lasting, does not disturb residents, periphery arable land is not take up, without any pollution risk.

Description

A kind of method of black-odor riverway restoration of the ecosystem in situ
Technical field
The present invention relates to ecological restoration technology on river technical field, the method for more particularly to a kind of black-odor riverway restoration of the ecosystem in situ.
Background technology
River bottom mud is the important component of the River ecosystem, and the self purification in river course, which is mostly derived from it, to be had The function such as dilution, absorption, microbial degradation.Wherein bed mud absorption and microbial degradation, is the conversion reduction of pollution of river thing Principal mode, bed mud plays irreplaceable effect to river course self-cleaning.
Because the point-source pollutions such as industrial wastewater, sanitary sewage are largely discharged into;Rainwash, agricultural runoff, the dry of air are sunk Drop and the wet pollution of area source such as be discharged into largely are imported;Rain is dirty long-term excessive, which to receive dirt etc., causes river sludge to be deposited, and water ecology causes Heavy damage.Oxygen supply and oxygen consumption mechanism are unbalance, are decomposed by aerobic microbiological and account for leading and be progressively changed into anaerobe activity, Water body is lost self-purification capacity and cause river course black smelly.
River sludge discharges substantial amounts of noxious material (including harmful gas in luxurious consumption water body while oxygen Body), the water quality for make water body be chronically at severe depletion of oxygen state, deteriorating more exacerbates river course OUR, thoroughly destruction river course bottom Mud and water system primary ecology system.Therefore vicious circle, causes water body severe contamination to be formed.
The most frequently used also most easy method of black-odor riverway is administered at present, is the water of the good quality with larger water system, pair The waters of smaller or local severe contamination is diluted and replaced.Such vicious circle, has caused overall water quality deterioration, or even portion Divide great rivers also to pollute in IV class even V class water, cause water crisis.
And the method that the improvement to sludge then uses dredging, but there are the following problems for its behavior:
I. cost is high, mechanical dredging 1hm3When bed mud about need ten thousand dollars of 9.9-24.7;II. dredging too deep will destroy original The ecosystem, Sediment Dredging may remove benthon, destroy the food chain of fish.If bed mud is dredged completely, can It can need for 2 to 3 years can just re-establish benthic community.III. the smaller work of desilting and dredging of city river section is not square Just dredger carries out operation at sea.IV. Dredged bed mud amount is big, pollutant component is complicated, moisture content is high and handles difficult.
The content of the invention
The technical problems to be solved by the invention, are to be directed to the above-mentioned skill in the presence of existing black-odor riverway repair process Art problem, and the method that a kind of restoration of the ecosystem in situ of black-odor riverway is provided.This method is counteracted each other principle following nature On the basis of ecological rule, using Modern microbiological technology to rely on, it is combined using technologies such as nano bubble, ecological floating islands, To melt oxygen to water body, set up microorganism system and long-term water ecology is safeguarded as means, reach progressively reduction river bed sludge, repair Multiple bed mud ecological functions, purify the purpose of malodorous black water.
The technical problems to be solved by the invention can be achieved through the following technical solutions:
A kind of method of black-odor riverway restoration of the ecosystem in situ, comprises the following steps:
(1) target river sludge is flushed using giant, river sludge is suspended among water body, while delivering micro- life Thing preparation, sets up microorganisms in water system, biochemical degradation water pollutant;
(2) nano-bubble generator is utilized, a large amount of nano grade air bubbles, nanometer gas are discharged into the black and odorous water in target river course The cluster towing force of bubble in the water surface, collects the organic matter float assembly in black and odorous water as the money for preparing bio-organic fertilizer immediately Source, while improving part pollutant in Dissolved Oxygen in Water content, redox water;
(3) step (2) one is completed to two days later, set on the waters for administering river course on plant chinampa, plant chinampa Plant absorption microorganism conversion sludge release nutriment;Interacted simultaneously with the photosynthetic function of microorganism, set up and Safeguard water-bed ecological, carry out sludge in-situ decrement and purify water;
In said process, the step (2) is always untill when being reached phase targets requirement.
In a preferred embodiment of the invention, a diameter of 0.1~50um of the nano grade air bubbles.
In a preferred embodiment of the invention, when carrying out step (3), it is 15 that the water body administered in river course, which melts oxygen amount, ~30mg/L.
In the present invention, the microorganism formulation is prepared from by the strain of following colony counts percentage:
In a preferred embodiment of the invention, in the step (2), delivered into the black and odorous water in target river course Microorganism formulation, its usage amount and method are:25 kilograms of microorganism formulations add 250 kilograms of target rivers, after being well mixed It is even to be invested in water body.
In a preferred embodiment of the invention, planting aquatic plants and setting carbon fibre on the plant chinampa Microorganism place body, with the normal growth for the sustainable and chinampa plant for ensuring microorganism system function.
As a result of technical scheme as above, the present invention compared with prior art, has the characteristics that:
1st, the nano grade air bubbles small volume that the present invention is used, residence time is long in water.The supercharging certainly of micro-nano bubble Effect, can effectively improve the mass-transfer efficiency and dissolved oxygen content of gas-liquid interface, under the conditions of water body rich oxygen content, and the present invention is used Microorganism can fully occur biological respinse, organic pollutants of degrading.In addition, nano bubble has the dynamic electricity in higher interface Gesture makes it have efficient absorption property, by adsorbing suspended particulate matter tiny in water, be collected as larger flco floating to The water surface, reaches the effect of air supporting dialysis.
2nd, microorganism formulation of the invention is by major function populations such as light compositing flora, nitric acid floras, with saccharomycete, Soluble phosphorus The composite bacteria agent that multiple collaboration floras such as bacterium, lactic acid bacteria, nitrogen-fixing bacteria are co-cultured, it is a kind of harmless to animal and plant, to ring The beneficial microbe system that border is not destroyed.Its effective every milliliter up to more than 10,000,000,000 of clump count, and under ideal conditions, Unit numbers can be doubled in per 20-30min, and its reproduction speed, which substantially exceeds, triggers all kinds of problems in sewage or water body Bacterium, can set up functional microorganism system rapidly in water body environment, effectively suppress the life behavior of all kinds of problem bacteriums.
The functional microorganism of the present invention is under excess oxygen, using in target water body, the organic substance particularly in sludge Metabolism is carried out, the inorganic harmless object such as carbon dioxide and water is finally converted to.Realize and progressively convert, decompose in the sludge of river bed Polluter, so as to reach abatement sludge in situ, repairs water ecology system, keeps the purpose of sustainable good water body environment.
3rd, plant chinampa of the invention uses water plant habit, (special using the haydite of microcellular structure, microorganism carrier Carbon fiber micropore structures), buoyancy engineering structure and Other Engineering material constitute.Cultivate as planting basket, the green plant in chinampa is Iris, monkey tail and copper coin grass etc., by the way of water planting, vegetal cover area accounts for the 1/5~1/3 of the overall water surface, due to difference River course illuminating area is different, and green plant laying area is slightly different.On the one hand the root system of chinampa plant can be absorbed by microorganism point Solve sludge and discharge nitrogenous, phosphorus substance in water, and the nutrition formed with microorganism in mutual cooperative effect, common degradation water Salt., can river training landscape and construction costs is low-cost.
Using the method for the black-odor riverway of present invention restoration of the ecosystem in situ, excellent Ecological Concept is adhered to, water body life is established and improve State system, cultivates self-purification of water function.And the decomposition of sludge underwater is changed through specified microorganisms progressively to cut down, reach elimination Sludge repairs its bed mud primary ecology system, recovers the ecological environment of hydrodynamic(al) plant growth procreation.Cost of investment of the present invention is low, behaviour Make simple, safeguard facility, stable treatment effect, the ecosystem that it is repaired is reliably lasting, do not disturb residents, be not take up periphery arable land, Without any pollution risk.
Embodiment
Below in a kind of method of black-odor riverway of present invention restoration of the ecosystem in situ, a certain black-odor riverway in Shanghai was repaired Journey and effect elaborate the present invention.
From field observation, yellowish-brown, foul smelling is presented in the water body of the black-odor riverway.Pollutant sources are neighbouring raw in water body The unordered discharge of sewage living, through live actual measurement, the depth of water is average:2m, sludge deep:20-80cm, visibility:15cm, water Face area is about 470m2, water body volume is about:940m3
Water quality detection is carried out to the water body of the black-odor riverway through applicant, it is as a result as follows:
Compared with water environment quality standard (GB 3838-2002):
Target Dissolved Oxygen in Water content:2.50, V class water quality standard settings are reached, but less than IV class water quality standard settings:
Target water body COD contents:97.15, it is 2.43 times of V class water quality standards setting;
Target water body ammonia-nitrogen content:8.55, it is 4.28 times of V class water quality standards setting;
Target water body total phosphorus content:0.84, it is 2.1 times of V class water quality standards setting;
Target water body pH:7.52, meet water standard.
Comprehensive detection result, tentatively draws to draw a conclusion:Target water pollution is serious, and dissolved oxygen is relatively low, COD, ammonia nitrogen, total Phosphorus severe overweight.
Testing result is shown in Table 1.
Table 1
The resolution of the black-odor riverway is as follows:
1. a pair pollution of river source is investigated, the culvert pipe passage that collateral line river course is connected is dammed.March into the arena within first day and take Water sample, the water sampling at 0.5m under sampling water surface vertical line, interval sampling detection in four to five days later, water body assay is shown in Table 2.According to construction requirement, the construction equipment such as the micro-nano bubble generator of installation and debugging, giant.
2. second day, 9:00~11:00,15:00~17:00, carry out dirt removal mud operation.Meanwhile, by 25 kilograms of microorganisms Input water body (noticing that microorganism dispensing is finished before 9 points) after preparation is mixed with 250kg target rivers, and floating object is removed immediately.
Microbial bacterial agent is prepared from by the strain of following colony counts percentage:
3. the 3rd day during target is completed, micro-nano bubble generator normal work, the working time is 9:00~11: 00,13:00~17:00, make target water body keep melting 15~30mg/L of oxygen amount.Hereafter, micro-nano is suitably adjusted according to testing result The working time of rice bubble generator and mode.
Nanometer aeration removes suspended particulate substance in water body.Oxygen supply is carried out to long-term low dissolved oxygen water body simultaneously, planted for heavy water Thing, which is provided, carries out the good ecological environment of photosynthesis offer;High-solubility oxygen environment is provided for aerobic microbiological Mixed cultures.Quilt The aquatic particle that the micro-nano bubble floating of high density is removed contains abundant organic matter, the original rare as biological organic fertilizer is prepared Material, thoroughly eliminates secondary pollution and realizes the utilization of resource.
4. laying wet type ecological floating island, chinampa is green to plant for iris, monkey tail and copper coin grass etc., by the way of water planting, this river Vegetal cover area accounts for the 1/4 of the overall water surface in road governance process.
Phased goal
First stage eliminates target black and odorous water, is laid the foundation to set up excellent ecosystem (the 3rd day to the tenth day).
Dissolved oxygen 3.5mg/L;
C O D 48.26mg/L;
Visibility 30cm;
Olfactory value, nothing but normal water peculiar smell.
Second stage establishes and improve the excellent ecosystem in river course, and three months by a definite date this stage (calculated) since the tenth day.
This stage on the basis of Dissolved Oxygen in Water is maintained, makes chinampa plant growth vigorous, fully absorbs conversion by function Microorganism decomposition river bed sludge, and the material such as a large amount of ammonia nitrogens, phosphorus discharged.And progress into biochemical decrement to river bed sludge, Avoid occupancy and secondary pollution of the conventional river training sludge to bank farmland.Its water body main project is set to reach following target:
Dissolved oxygen >=6mg/L;
C O D≤35mg/L;
Visibility >=45cm;
Mud decrement, the assimilation for being basically completed river bed mud organic substance matter is decomposed, and is eliminated atrament and is allowed to approach this Native color, brings back to life bed mud function.
Ammonia nitrogen >=1.5mg/L, and droop line is stablized in entrance.
Total phosphorus >=0.2mg/L, and droop line is stablized in entrance.
The excellent ecosystem in river course is consolidated and safeguarded to phase III, and culture river course continues self-purification function.
This stage is to continue to start after second stage, on the basis of excellent ecosystem is established and improve to river course, it is ensured that On the premise of there is no serious external source pollution remittance, the first stage initial setting of damming to water system circulation duct is released;
2/3rds of initially put chinampa amount are cancelled, consumption of the chinampa plant to target water body oxygen is reduced.Management is good surplus Remaining chinampa plant, makes it keep growing vigorous and appropriate scale for a long time.Set up one to be combined with river bed submerged plant, suitably The natural water environment of the biology procreation growth such as fish, shrimp, spiral shell;
Periodically to river course water system tracing detection, active defense maintenance measure is taken, it is ensured that river course entirety water quality dominant term Mesh index reaches or better than V class standards:
Dissolved oxygen >=6mg/L (being II class water standard);
C O D≤20mg/L (being III class water standard);
Visibility >=50cm (being normal water standard);
Ammonia, nitrogen >=1.5mg/L (being IV-V class water standard), by initial value by peak value, and are gradually decreased to low In initial value, and enter droop line it is stable in >=1.5mg/L (because two sides, which are appointed, so a certain amount of, scattered pollution Source is imported);
Total phosphorus >=0.2mg/L (being IV-V class water standard), by initial value by peak value, and gradually decreases to be less than Initial value, and enter droop line it is stable in >=0.2mg/L (because two sides, which are appointed, so a certain amount of, scattered pollution sources Import).
Ecology, keeps the clean and lasting self-purification function of bed mud, indigenous pasture and water well-grown, the ecosystem such as fish, shrimp, spiral shell It is perfect.
Table 2

Claims (7)

1. the method for a kind of black-odor riverway restoration of the ecosystem in situ, it is characterised in that comprise the following steps:
(1) target river bed sludge is turned over using giant punching, river sludge is suspended in water body;
(2) during step (1) progress, microorganism formulation is delivered into target water body, water pollutant of degrading sets up water body Ecosystem;
(3) micro-nano bubble generator is utilized, a large amount of nano grade air bubbles, the cluster of nano bubble are discharged into target black and odorous water Suspension in black and odorous water is floated agent in the water surface by towing force, is collected as the resource for preparing bio-organic fertilizer, is carried simultaneously immediately High Dissolved Oxygen in Water content, redox organic pollutants;
(4) step (3) one is completed to two days later, the plant absorption on plant chinampa, plant chinampa is set in target water The nutriment of microorganism conversion, while being interacted with the photosynthetic function of microorganism, sets up and safeguards water-bed ecological, carry out dirty Mud decrement purifies water;
In said process, the step (3) is always untill when being reached phase targets requirement.
2. a kind of method of black-odor riverway restoration of the ecosystem in situ described in claim 1, it is characterised in that the nano grade air bubbles A diameter of 0.1~50um.
3. the method for a kind of black-odor riverway restoration of the ecosystem in situ described in claim 1, it is characterised in that carrying out step (2) When, the water body dissolved oxygen amount administered in river course is 15~30mg/L.
4. a kind of method of black-odor riverway restoration of the ecosystem in situ described in claim 1, it is characterised in that the microorganism formulation It is prepared from by the strain of following colony counts percentage:
5. the method for a kind of black-odor riverway restoration of the ecosystem in situ described in claim 1, it is characterised in that in the step (1) In, microorganism formulation is delivered into the black and odorous water in target river course, refers to that 25 kilograms of microorganism formulations add 200 kilograms of target rivers Road water, is delivered into target water body again after being well mixed.
6. the method for a kind of black-odor riverway restoration of the ecosystem in situ described in claim 1, it is characterised in that on the plant chinampa Upper planting aquatic plants and setting carbon fibre microorganism place body, to ensure the sustainable and chinampa plant of microorganism system function Normal growth.
7. a kind of method of black-odor riverway described in claim 1 restoration of the ecosystem in situ, it is characterised in that the water plant is Iris, monkey tail, one kind in copper coin grass or any two or more mixing.
CN201710545304.XA 2017-07-06 2017-07-06 In-situ ecological restoration method for black and odorous riverway Active CN107311314B (en)

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CN108298675A (en) * 2018-01-20 2018-07-20 湖南润万环保科技有限公司 A kind of drop nitrogen subtracts the lake water ecological restoring method of phosphorus
CN108298695A (en) * 2018-01-15 2018-07-20 杭州秀川科技有限公司 A kind of administering method of river black and odorous water
CN108911443A (en) * 2018-09-29 2018-11-30 四川捷途环保服务有限公司 A kind of small watershed Water Ecological Recovery integrates governing system and method
CN108975519A (en) * 2018-08-11 2018-12-11 浙江始祖鸟环境工程有限公司 A kind of method of river corridor restoration
CN110255810A (en) * 2019-05-31 2019-09-20 广东五色时空生态环境科技有限公司 Black-odor riverway biology in situ ecology synthesis intervenes sewage quality lifting process
CN110590054A (en) * 2019-08-15 2019-12-20 台圣环保设备(马鞍山)有限公司 River water quality improving method
CN110759602A (en) * 2019-11-26 2020-02-07 南京师范大学 Treatment system and treatment method for purifying water quality of branch creeks in black and odorous riverways
CN111689640A (en) * 2019-03-13 2020-09-22 北京北方宏拓环境科技有限公司 Sewage treatment method

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CN106186343A (en) * 2016-08-26 2016-12-07 广州市戴斌生态环境科技有限公司 A kind of comprehensive processing method to urban river
CN106830365A (en) * 2017-03-07 2017-06-13 天津大学 A kind of biology is removed contamination water quality purification method

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CN108298695A (en) * 2018-01-15 2018-07-20 杭州秀川科技有限公司 A kind of administering method of river black and odorous water
CN108298675A (en) * 2018-01-20 2018-07-20 湖南润万环保科技有限公司 A kind of drop nitrogen subtracts the lake water ecological restoring method of phosphorus
CN108975519A (en) * 2018-08-11 2018-12-11 浙江始祖鸟环境工程有限公司 A kind of method of river corridor restoration
CN108975519B (en) * 2018-08-11 2021-06-29 浙江始祖鸟环境工程有限公司 River channel ecological restoration method
CN108911443A (en) * 2018-09-29 2018-11-30 四川捷途环保服务有限公司 A kind of small watershed Water Ecological Recovery integrates governing system and method
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CN111689640A (en) * 2019-03-13 2020-09-22 北京北方宏拓环境科技有限公司 Sewage treatment method
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