CN203820591U - Integrated sewage treatment equipment - Google Patents

Integrated sewage treatment equipment Download PDF

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Publication number
CN203820591U
CN203820591U CN201420164102.2U CN201420164102U CN203820591U CN 203820591 U CN203820591 U CN 203820591U CN 201420164102 U CN201420164102 U CN 201420164102U CN 203820591 U CN203820591 U CN 203820591U
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China
Prior art keywords
tank
pond
carbon source
communicated
casing
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CN201420164102.2U
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Inventor
裴廷权
李文生
李健驰
王茜
周岗泉
李争阳
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Yunnan Hexu Environmental Technology Co Ltd
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Shenzhen He Xu Environmental Science And Technology Co Ltd
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Abstract

The utility model discloses integrated sewage treatment equipment comprising a box body, a fluidized bed bio-film reactor, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, a clean water tank and a sludge tank, wherein the fluidized bed bio-film reactor comprises a pre-nitrification tank, and a water inlet is formed at the joint of the pre-nitrification tank and the bottom wall of the box body; the pre-nitrification tank is communicated with the upper end of the anaerobic tank; the bottom of the anoxic tank is communicated with the anaerobic tank; the upper end of the aerobic tank is communicated with the anoxic tank; the sedimentation tank is arranged on one side of the aerobic tank and is communicated with the aerobic tank; the clean water tank is communicated with the sedimentation tank; the sludge tank is communicated with the sedimentation tank; a carbon source isolation device and an aeration device are arranged in the anoxic tank; and a blower device is arranged at the top of the sludge tank. The integrated sewage treatment equipment disclosed by the utility model can be used for effectively controlling the release speed of a carbon source; a biochemical reaction in the anoxic tank can be performed more fully, the sludge tank can be cleaned more completely, and the treatment effect can be significantly improved.

Description

A kind of integrated sewage disposal device
Technical field
The utility model relates to sewage disposal device field, particularly a kind of integrated sewage disposal device.
Background technology
For Sewage treatment systems, mainly comprise pretreatment system, biochemical treatment system, muddy water filtering system three parts; Pretreatment system is mainly comprised of grid filtering basin, equalizing tank, for filtering large granular impurity, and sewage quality is kept evenly; Biochemical treatment system mainly contains anaerobism, anoxic, the treatment system such as aerobic forms, in the situation that sewage load is larger, conventionally by anaerobic pond, anoxic pond, Aerobic Pond, formed, in biochemical treatment tank, need to add anerobe, aerobic bacteria etc., nitrogen, phosphoric in they and sewage are reacted, remove rich nutritive material; Muddy water filtering system is mainly by air-flotation system, and the formations such as second pond are mainly carried out the physical sepn of mud and clear water.
In recent years, along with the continuous acceleration of urbanization process, rural environment comprehensive improvement is subject to government and the people's extensive concern.In water environmental problems, become increasingly conspicuous under the new situation, strengthen country sewage comprehensive improvement, for solving, current the faced shortage of water resources of China and water environment pollution problem are significant.Yet the life that Rural areas produces and production waste have dispersion, the pipe network features such as easily collecting, the water yield be not unstable, thereby are not suitable for adopting traditional wastewater treatment plant to process.
In current integrated sewage treating apparatus, still there are some problems, in common sewage disposal, need to add carbon source in reaction tank, for the anti-nitration reaction of microorganism is supplied raw materials, but sewage disposal device is all directly put in reaction tank by carbon source at present, and conventional carbon source is liquid, as methyl alcohol, glucose etc., therefore need repeatedly to add on time, and this type of liquid carbon source discharges too fast, increase on the one hand old of sewage disposal, also reduced the effect that sewage denitrification is processed simultaneously; Moreover in common sewage disposal device, intermittent aeration device is all to adopt gas blower directly to pass into air in treating pond, the consequence causing is like this, aeration rate and biochemical reaction do not mate, and cause biochemical reaction insufficient, and treatment effect is not good.After sewage disposal, through after mud-water separation, owing to still containing some special materials in this mud, cause this mud to be easy to be solidificated on equipment, etching apparatus, in integrated sewage treating apparatus, sludge sump is the state of sealing, the very trouble of therefore cleaning.
Utility model content
The purpose of this utility model is to solve in prior art in sewage disposal device that aeration is unreasonable, and liquid carbon source discharges too fast, and high cost and mud clean the problem of trouble, and for solving the problems of the technologies described above, the utility model adopts following technical scheme:
An integrated sewage disposal device, it comprises:
One casing, is provided with a plurality of cavitys in this casing;
One MBBR, comprising: a pre-nitrification tank, described pre-nitrification tank bottom is fixed on the diapire of described casing, and this pre-nitrification tank be provided with a water-in with casing diapire junction; One anaerobic pond, it is outside that described anaerobic pond is located on described pre-nitrification tank, and described pre-nitrification tank is communicated with described anaerobic pond upper end; One anoxic pond, it is outside that described anoxic pond is located on described anaerobic pond, and described anoxic pond bottom is communicated with described anaerobic pond; One Aerobic Pond, this Aerobic Pond is the cavity between this anoxic pond outer wall and this casing, described Aerobic Pond upper end is communicated with described anoxic pond;
One settling tank, this settling tank is located at described Aerobic Pond one side, and described Aerobic Pond is communicated with described settling tank;
One clean water basin, these clean water basin are communicated with described settling tank;
One sludge sump, this sludge sump is communicated with described settling tank;
Wherein, be provided with a carbon source disrupter and an intermittent aeration device in described anoxic pond, described sludge sump top is provided with an air-blast device.
Wherein, described carbon source disrupter is the many evenly distributed open tubes that are connected in described casing top, and this open tube tube wall is provided with fine and closely woven through hole.
Wherein, the top of the carbon source disrupter in described anoxic pond in described intermittent aeration device.
Preferably, the bottom of described sludge sump is a dome shape diapire.
Preferably, this pre-nitrification tank, anaerobic pond, anoxic pond are to be all cylindric, this pre-nitrification tank, anaerobic pond, anoxic pond and Aerobic Pond successively from inside to outside ring set be fixed on the diapire of this casing.
Wherein, this pre-nitrification tank upper end and casing roof are provided with a plurality of through holes.
Wherein, in this settling tank, be provided with a screen plate, between this screen plate and casing diapire, be an acute angle fixed installation.
Wherein, described screen plate rearranges with body for many.
Preferably, this kind of integrated sewage disposal device also comprises a grid filtration unit, for the preliminary thicker impurity that filters sewage.
Preferably, this kind of integrated sewage disposal device also comprises a stereo ecological bed, and this stereo ecological bed is connected in this clean water basin, the water in clean water basin can be carried out to secondary-cleaned.
A kind of integrated sewage disposal device of the present utility model, by be provided with a carbon source disrupter and intermittent aeration device in anoxic pond, and in sludge sump, be provided with air-blast device, effectively controlled on the one hand the release rate of carbon source, can provide for the biochemical reaction in anoxic pond more rational reaction conditions on the other hand, also facilitate the thorough cleaning of sludge sump, wastewater treatment efficiency significantly improves.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of a kind of integrated sewage disposal device of this utility model, and wherein MBBR and sludge sump partly adopt sectional view;
Fig. 2 is the vertical view of a kind of integrated sewage disposal device of this utility model;
Fig. 3 is the side-view of a kind of integrated sewage disposal device of this utility model;
Fig. 4 is the processing technological flow figure of a kind of integrated sewage disposal device of this utility model.
Embodiment
The exemplary embodiment that embodies the utility model feature & benefits will describe in detail in the following description.Be understood that the utility model can have various variations on different embodiments, it neither departs from scope of the present utility model, and explanation wherein and to be shown in be when the use that explain in essence, but not in order to limit the utility model.
A kind of integrated sewage disposal device of the utility model for living, the processing of production waste.
Consult accompanying drawing 1, a kind of integrated sewage disposal device of this utility model, it comprises: a casing 1, it is the airtight casing with a plurality of chambers; MBBR 2(also can be referred to as MBBR), it comprises pre-nitrification tank 21, one anaerobic pond 22, one anoxic pond 23, and an Aerobic Pond 24; One settling tank 3, this settling tank 3 is communicated with MBBR 2; One clean water basin 4, this clean water basin 4 collect through settling tank 3 after separatings can discharge water; One sludge sump 5, the mud after these sludge sump 5 collecting precipitation pond 3 precipitations.
Consult accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3, casing 1 is a rectangular parallelepiped watertight chest in the present embodiment, and its inside is separated into a plurality of accommodating chamber by dividing plate, and wherein, this casing adopts corrosion-resistant, high strength, and the good material of barrier performance is made.
As seen from the figure, MBBR 2 comprises pre-nitrification tank 21, pre-nitrification tank 21 is fixed on the diapire of casing 1, between pre-nitrification tank 21 upper ends and casing roof, be provided with a plurality of through holes, this through hole overflows from upper end for the sewage of processing through pre-nitrification tank, pre-nitrification tank 21 is provided with a water-in 210 with casing 1 junction, and this water-in 210, for outside is arranged in this kind of integrated sewage disposal device through the sewage of preliminary treatment, carries out subsequent disposal.Wherein this pre-nitrification tank 21 is cylindric.
MBBR 2 also comprises an anaerobic pond 22, and this anaerobic pond 22 is cylindric, and the diapire of casing 1 is fixed in its one end, and this anaerobic pond 22 is located on pre-nitrification tank 21 outsides, and pre-nitrification tank 21 is fixed in this anaerobic pond 22.Sewage in pre-nitrification tank 21 spills in this anaerobic pond 22 from the upper end of this pre-nitrification tank 21.
MBBR 2 also comprises an anoxic pond 23, and this anoxic pond 23 is cylindric, and this anoxic pond 23 is located on anaerobic pond 22 outsides, and anoxic pond 23 is communicated with anaerobic pond 22 bottoms.The interior sewage of anaerobic pond 22, through after anaerobic treatment, is transported to anoxic pond 23 and is further processed from anaerobic pond bottom.Wherein, in anoxic pond 23, be provided with carbon source disrupter 230, concrete, this carbon source disrupter 230 is the many open tubes that are fixed on described casing top, open tube is evenly distributed to be installed in anoxic pond, and open tube vertically installs, and open tube tube wall is provided with fine and closely woven through hole 2301.Open tube upper end is supported one end, described casing top and is provided with the material mouth (attached not shown) that can conveniently add filler, in open tube, can add carbon source, and these carbon sources can be stalks, rice husk etc.These carbon sources are different from traditional liquid carbon source, and its release rate is slower, and adding a carbon source can allow the carbon source of adding fully react for biochemical reaction for a long time, can not cause the waste of carbon source.And the carbon source in the utility model is solid-state, be directly added in carbon source disrupter 230, can grasp very easily the Expenditure Levels of carbon source, and add in time.Below carbon source disrupter 230, be provided with an intermittent aeration device 231, concrete, this intermittent aeration device 231 is one to be surrounded on the annular body in anoxic pond, ring pipe surface is provided with evenly fine and closely woven solarization air cap 2311, the diameter of this solarization air cap is 0.8mm to 2mm, and this intermittent aeration device 231 provides reaction required gas for the biochemical reaction in anoxic pond 23.It should be noted that, the dissolved oxygen amount in this anoxic pond 23 is not more than 0.5ml/L.
MBBR 2 also comprises an Aerobic Pond 24, and this Aerobic Pond 24 is the common spatial accommodations that form of described anoxic pond 23 outer walls and wall box, and the upper end of Aerobic Pond 24 is communicated with anoxic pond 23.Sewage spills into from anoxic pond 23 tops after processing through anoxic pond 23 and Aerobic Pond 24, carries out aerobic treatment.
Settling tank 3 is arranged at a side of MBBR 2, and the sewage after processing through Aerobic Pond 24 enters into this settling tank 3, and these settling tank 3 middle parts are provided with a screen plate 30, and this screen plate 30 carries out the separated of silt and water by the sewage that contains silt.Preferably, described screen plate 30 is certain acute angle with described casing 1 diapire to be installed, i.e. oblique heavy pond, and this inclination is installed screen plate 30 and is conducive to accelerate the separation between silt and water, has improved the sewage treatment capacity of integral device.Concrete, screen plate 30 rearranges for many bodys.
Clean water basin 4 are arranged at settling tank 3 front portions, between clean water basin 4 and settling tank 3, be communicated with, it is a cubic pond body, water through settling tank 3 after separatings enters this clean water basin 4, water in these clean water basin 4 be through up to standard after processing can discharge water, now can be by this water for irrigating, washing, the use such as flush the toilet.
Sludge sump 5 is communicated with settling tank 3, and the water of process settling tank 3 after separatings enters clean water basin 4, and precipitation mud afterwards enters this sludge sump 3, and this sludge sump 5 concentrates mud, mummification, and the outward transport of carrying out mud is regularly processed.Wherein, these sludge sump 5 bottoms are provided with the diapire 51 of a dome shape, and preferred, the curvature of the diapire 51 of this dome shape approaches 1, can reach and improve sludge sump capacity on the one hand, are conducive to the discharge of mud simultaneously.At the top of sludge sump 5, be provided with an air-blast device 52, preferred, this air-blast device 52 is air blast pipe connecting road junctions, by external blower, by connecting pipe of pipeline road junction, carries out air blast.This air-blast device 52, for the cleaning of sludge sump 5, when sludge sump 5 cleans, enters sludge sump 5 by the water in clean water basin 4, starts air-blast device 52 simultaneously, can thoroughly sludge sump 5 be cleaned up like this, particularly, the dead angle part in sludge sump 5.
It should be noted that, a kind of integrated sewage disposal device of the utility model, the device that has mainly reflected in the accompanying drawings the main treating processes of this equipment, as conventional sewage treatment process, before sewage enters this kind of integrated sewage disposal device, need to pass through preliminary processing, first can adopt coarse grid to filter the larger impurity in sewage, then pass through fine and closely woven grid secondary filtration, thereby filter out less impurity.Finally contain and lessly compared with the sewage of small impurities, just can enter this kind of integrated sewage disposal device.
At the larger emission source place of some oleaginousness, restaurant for example, the source of sewage such as refinery, after sewage is processed through contaminant filter, preferably, this sewage is entered in air supporting grease trap, in the sewage after processing through this air supporting grease trap, oleaginousness seldom, can improve quality of sewage disposal and efficiency so on the one hand, can effectively prevent that greasy dirt from stopping up, corrosion pipeline simultaneously.
Water in clean water basin 4 after a kind of integrated sewage disposal device processing through this, preferably, further can be by this water again by stereo biological bed (not illustrating in accompanying drawing), the technology of stereo biological bed is very ripe at present, its frame mode is also conventional at present mode, does not repeat them here.Water purification standard after processing through stereo ecological bed is higher.
In order to further illustrate the constitutional features of a kind of integrated sewage disposal device of the utility model, now by reference to the accompanying drawings 4, concrete this sewage disposal device of application technical process illustrate, consult accompanying drawing 4, as seen from the figure, this kind of integrated sewage disposal device sewage treatment process comprises following process:
(1), in above-mentioned treatment process, sanitary sewage is removed in sewage after bulk suspended substance solid by coarse rack, fine fack, after mixing, flows into equalizing tank with the sewage from catering business of processing through air supporting oil removal;
(2) sewage carries out homogeneous in equalizing tank, all amount is processed;
(3) by promoting water pump, sewage in equalizing tank is sent in MBBR integration apparatus, carried out biochemical treatment, and through contact sterilizing qualified discharge;
(4) excess sludge producing in biological process enters in the concentrated storage of mud pond and stores, regularly outward transport, and supernatant liquor is back to equalizing tank.
Wherein, air supporting grease trap has increased slag, water separation and deslagging function on traditional oil trap basis, air supporting function, automatic wiping function.Having improved the separation efficiency of grease, solid dirt, be conducive to the collection and use of oil slick, solid dirt, is the product innovation of traditional oil trap upgrading.
Oil removal by air bubbling process comprises that Bubble formation, bubble and greasy dirt and solid particulate adhere to the steps such as rising, oil-scraping device be separated and form.Its principle is that bubble generator makes to produce in water a large amount of micro bubbles, thereby forms water, bubble and greasy dirt solid particulate three-phase mixture.Under the acting in conjunction of the many kinds of force such as interfacial tension, air supporting rising buoyancy and hydrostaticpressure be poor, after impelling micro bubble to stick on removed greasy dirt and solid particulate, because sticky and volume density are less than water, float to the water surface, thus make in water greasy dirt with solid particulate by the separated removal of automatic wiping device.
Wherein, grid is installed in frame trough.Grid is mainly used to tackle the agglomerate floater in sewage, to guarantee the normal operation of subsequent disposal structures and effectively to alleviate, processes load, for the long-term normal operation of system is given security.
Wherein, the function of equalizing tank is: because the water quality from each period, the water yield are all different, general peak flow is 2~8 times of average treatment amount, therefore for treatment system is moved continuously and stably, and while regulating pondage and homogenizing water quality.
The built-in submersible sewage pump of equalizing tank and backflow measure, to guarantee that certain rated flow is promoted to subsequent biological treatment system, reduce the impact load of the water yield to system.For guaranteeing in equalizing tank not deposit dirt, establish perforated pipe aerating regulation stirring system simultaneously, realize anoxic also as denitration pond in advance.
Integrated MBBR explanation:
Divide pre-nitrification tank, anaerobic pond, anoxic pond, Aerobic Pond, also optionally have sterilization pool, equipment room.
The major function of anaerobic pond is to coordinate dephosphorization with Aerobic Pond.Biological phosphate-eliminating be polyP bacteria in sewage under anaerobic, be subject to constraining and discharge the phosphoric acid salt in body, generate energy is in order to absorb fast degradation organism, and is converted into poly-β hydroxybutyric acid (PHB) and stores.The PHB that just degrades when these polyP bacterias enter Aerobic Pond and store in body, generate energy, for the synthetic of cell with inhale phosphorus, absorbs the phosphorus containing sludge that phosphorus in sewage forms high density, discharges system, thereby reach the object of dephosphorization with excess sludge.
The major function of anoxic pond is denitrification denitrogenation.Denitrifying bacteria at dissolved oxygen concentration, under extremely low or anaerobic conditions, can utilize nitrate in nitrogen as electron acceptor(EA) oxidation of organic compounds, the nitrogen in nitrate is reduced into nitrogen, thereby completes the denitrification process of sewage.In pond, establish perforated pipe intermittent aeration and realize anoxic.In this embodiment, in this anaerobic pond, be provided with carbon source disrupter, in carbon source disrupter, add carbon source, thereby promote anti-nitration reaction.Described carbon source can be the stalk of pulverizing, and rice husk etc. are preferred, the carbon source of pulverizing can be made into a certain size ball, then drop in carbon source disrupter.
The major function of Aerobic Pond is oxidation organic matter and nitrated ammonia nitrogen.Microorganism in active sludge, under the condition of aerobic, for the synthesis of new cell, carries out katabolism by another part organism to obtain the synthetic required energy of cell by a part of organism in sewage, and its final product is CO 2and H 2the stable materials such as O.When organism is oxidized, the organonitrogen in sewage is also oxidized to ammonia nitrogen, the in the situation that, mud sufficient at dissolved oxygen age being longer, is further oxidized to nitrite and nitrate.
Sewage flows into settling tank after biochemical treatment, realizes mud-water separation.In pond, sludge reflux system is installed simultaneously, the active sludge in pond is partly drained into integration apparatus anaerobic zone by return sludge pump.Excess sludge regularly enters sludge sump.
After the regularly outward transport of mud in sludge sump, need to further clean, now open air-blast device, and the water in clean water basin is arranged into sludge sump, thereby sludge sump is cleaned thoroughly.
Sterilization pool, the water outlet of settling tank again can be up to standard through sterilization, and the design adopts clorox sterilization.
Equipment room is mainly used in laying the equipment such as gas blower, nitrification liquid reflux pump, sludge reflux pump.
Although described the utility model with reference to several exemplary embodiment, should be appreciated that term used is explanation and exemplary and nonrestrictive term.Because the utility model can specifically be implemented in a variety of forms and not depart from spirit or the essence of utility model, so be to be understood that, above-mentioned embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.

Claims (10)

1. an integrated sewage disposal device, is characterized in that, comprising:
One casing, is provided with a plurality of cavitys in this casing;
One MBBR, comprising: a pre-nitrification tank, described pre-nitrification tank bottom is fixed on the diapire of described casing, and this pre-nitrification tank be provided with a water-in with casing diapire junction; One anaerobic pond, it is outside that described anaerobic pond is located on described pre-nitrification tank, and described pre-nitrification tank is communicated with described anaerobic pond upper end; One anoxic pond, it is outside that described anoxic pond is located on described anaerobic pond, and described anoxic pond bottom is communicated with described anaerobic pond; One Aerobic Pond, this Aerobic Pond is the cavity between this anoxic pond outer wall and this casing, described Aerobic Pond upper end is communicated with described anoxic pond;
One settling tank, this settling tank is located at described Aerobic Pond one side, and described Aerobic Pond is communicated with described settling tank;
One clean water basin, these clean water basin are communicated with described settling tank;
One sludge sump, this sludge sump is communicated with described settling tank;
Wherein, be provided with a carbon source disrupter and an intermittent aeration device in described anoxic pond, described sludge sump top is provided with an air-blast device.
2. a kind of integrated sewage disposal device according to claim 1, is characterized in that, described carbon source disrupter is the many evenly distributed open tubes that are connected in described casing top, and this open tube tube wall is provided with fine and closely woven through hole.
3. a kind of integrated sewage disposal device according to claim 1, is characterized in that, the top of the carbon source disrupter in described anoxic pond in described intermittent aeration device.
4. a kind of integrated sewage disposal device according to claim 1, is characterized in that, the bottom of described sludge sump is a dome shape diapire.
5. a kind of sewage disposal device that is provided with carbon source disrupter according to claim 1, it is characterized in that, this pre-nitrification tank, anaerobic pond, anoxic pond are to be all cylindric, this pre-nitrification tank, anaerobic pond, anoxic pond and Aerobic Pond successively from inside to outside ring set be fixed on the diapire of this casing.
6. a kind of sewage disposal device that is provided with carbon source disrupter according to claim 1, is characterized in that, this pre-nitrification tank upper end and casing roof are provided with a plurality of through holes.
7. a kind of sewage disposal device that is provided with carbon source disrupter according to claim 1, is characterized in that, is provided with a screen plate in this settling tank, is an acute angle fixed installation between this screen plate and casing diapire.
8. a kind of integrated sludge treatment device according to claim 7, is characterized in that, described screen plate rearranges with body for many.
9. a kind of sewage disposal device that is provided with carbon source disrupter according to claim 1, is characterized in that, also comprises that one for the preliminary grid filtration unit that filters the thicker impurity of sewage.
10. a kind of sewage disposal device that is provided with carbon source disrupter according to claim 1, is characterized in that, also comprises a stereo ecological bed.
CN201420164102.2U 2014-04-04 2014-04-04 Integrated sewage treatment equipment Active CN203820591U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104445830A (en) * 2014-12-15 2015-03-25 深圳合续环境科技有限公司 A3O-MBBR integrated sewage treatment device and sewage treatment method
CN104973686A (en) * 2015-06-10 2015-10-14 中国水产科学研究院南海水产研究所 Method for preparing solid carbon source for nitrogen removal of aquaculture wastewater
CN105502850A (en) * 2016-01-25 2016-04-20 河北农业大学 Wastewater and garbage integrated treatment method and device for cold areas

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104445830A (en) * 2014-12-15 2015-03-25 深圳合续环境科技有限公司 A3O-MBBR integrated sewage treatment device and sewage treatment method
CN104973686A (en) * 2015-06-10 2015-10-14 中国水产科学研究院南海水产研究所 Method for preparing solid carbon source for nitrogen removal of aquaculture wastewater
CN105502850A (en) * 2016-01-25 2016-04-20 河北农业大学 Wastewater and garbage integrated treatment method and device for cold areas
CN105502850B (en) * 2016-01-25 2019-01-22 河北农业大学 A kind of cold district sewage rubbish integral treatment method and device

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Address after: 671000 Room 302, main building, public service center, fortune Industrial Park, Xiangyun County, Dali Bai Autonomous Prefecture, Yunnan

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Address before: 671000 Room 302, main building, public service center, fortune Industrial Park, Xiangyun County, Dali Bai Autonomous Prefecture, Yunnan

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