CN109250817A - Sanitary sewage purifying biogas generating pit - Google Patents

Sanitary sewage purifying biogas generating pit Download PDF

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Publication number
CN109250817A
CN109250817A CN201811150756.9A CN201811150756A CN109250817A CN 109250817 A CN109250817 A CN 109250817A CN 201811150756 A CN201811150756 A CN 201811150756A CN 109250817 A CN109250817 A CN 109250817A
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CN
China
Prior art keywords
sub
filter chamber
sanitary sewage
generating pit
level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811150756.9A
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Chinese (zh)
Inventor
彭朝晖
孙家宾
朱顺熙
陈光年
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu Academy of Agriculture and Forestry Sciences
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Chengdu Academy of Agriculture and Forestry Sciences
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu Academy of Agriculture and Forestry Sciences filed Critical Chengdu Academy of Agriculture and Forestry Sciences
Priority to CN201811150756.9A priority Critical patent/CN109250817A/en
Publication of CN109250817A publication Critical patent/CN109250817A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C02F3/28Anaerobic digestion processes
    • C02F3/284Anaerobic digestion processes using anaerobic baffled reactors
    • 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
    • C02F3/28Anaerobic digestion processes
    • C02F3/286Anaerobic digestion processes including two or more steps
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M23/00Constructional details, e.g. recesses, hinges
    • C12M23/34Internal compartments or partitions
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M25/00Means for supporting, enclosing or fixing the microorganisms, e.g. immunocoatings
    • C12M25/14Scaffolds; Matrices
    • 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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

The invention discloses a kind of sanitary sewage purifying biogas generating pits, including the buffering cinder pocket being sequentially connected to by connecting tube, three-level anaerobic fermentation room and Multi-level deflector formula filter chamber, three-level anaerobic fermentation room is divided into multiple sub- fermenting cellars being sequentially connected to by the first partition wall, Multi-level deflector formula filter chamber multiple sub- filter chambers being sequentially connected to are given by the second partition wall, hole is set between two neighboring sub- filter chamber, sub- filter chamber is divided into baffling filtering area and gravity settling zone by turning over waterwall, baffling filtering area is connected to gravity settling zone, baffling filtering area passes through the clear water zone that filter plate is divided into underlying sludge settling area and is located above, hole between sub- filter chamber and previous sub- filter chamber is located at the sludge settling area of the sub- filter chamber, hole between sub- filter chamber and latter sub- filter chamber is located at the gravity settling zone of the sub- filter chamber.Water in the present invention after fermentation process carries out folded filter in Multi-level deflector formula filter chamber, the water quality for the water that improves that treated.

Description

Sanitary sewage purifying biogas generating pit
Technical field
The present invention relates to technical field of sewage, more particularly to a kind of sanitary sewage purifying biogas generating pit.
Background technique
Sanitary sewage refers to the fecal sewage, kitchen waste water, bath sewage etc. discharged during resident living.Urban life Sewage discharge has been the primary pollution source of Chinese city water, and sanitary sewage disposal is urban water conservation at present and in the future and city water ring The most important thing of work is protected in border, and this requires us using the construction of processing sanitary sewage facility as urban infrastructure Important content is grabbed, and is too impatient to wait thing.
Biogas be organic substance under anaerobic, a kind of mixed gas generated by the fermentation of microorganism. It is often seen that there is bubble to come up in marshland, Bilge or manure pit, it, can be its point if we draw match Combustion, here it is the biogas that nature naturally occurs.Since this gas is swampy, so referred to as biogas at first. The various organic matters such as human and animal excreta, stalk, sewage ferment under the conditions of anaerobism (not having oxygen) in closed methane-generating pit, quilt Miscellaneous methane fermentating microorganism decomposition and inversion, to generate biogas.
Biogas is the mixture of multiple gases, and characteristic is similar to natural gas.Biogas is except directly burning is for cooking, drying Agricultural and sideline product, heating, illumination and gas welding etc. are outer, can also make the fuel and production methanol, formalin, carbon tetrachloride of internal combustion engine Equal industrial chemicals.The feed liquid and sediment being discharged after firedamp gas equipment ferments, containing more rich nutriment, can be used as fertilizer and Feed.
With the development of science and technology, direct utilize of sewage has become possibility.Occur generating biogas using sewage now Methane-generating pit, but although existing this methane-generating pit produces biogas, but it is inadequate to the processing of sewage, lead to the water of discharge not It meets the requirements.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of sanitary sewage purifying biogas generating pits, after fermentation Water Multi-level deflector formula filtering indoor folding filtering, improve filter effect.
The purpose of the present invention is achieved through the following technical solutions: sanitary sewage purifying biogas generating pit, including sequentially connects Logical buffering cinder pocket, three-level anaerobic fermentation room and Multi-level deflector formula filter chamber, three-level anaerobic fermentation room by first every Wall is divided into multiple sub- fermenting cellars being sequentially connected to, and multiple sub- fermenting cellars constitute the fermentation channel of folding shape, two neighboring sub- fermentation Water hole is provided on the first partition wall between room, the three-level anaerobic fermentation is provided in room for the soft of strain apposition growth Filler;
Multi-level deflector formula filter chamber gives multiple sub- filter chambers being sequentially connected to by the second partition wall, and multiple sub- filter chambers constitute folding Shape filtration channel is provided with filtered water inlet mouth on the side wall of first sub- filter chamber, is provided on the side wall of last sub- filter chamber Water outlet is filtered, hole is set between two neighboring sub- filter chamber, the sub- filter chamber is divided into baffling filtering area by turning over waterwall With gravity settling zone, the baffling filtering area is connected to gravity settling zone, and the baffling filtering area is divided into position by filter plate Sludge settling area in lower section and the clear water zone being located above, the hole between the sub- filter chamber and previous sub- filter chamber is located at should The sludge settling area of sub- filter chamber, the gravity that the hole between the sub- filter chamber and latter sub- filter chamber is located at the sub- filter chamber precipitate Area.
Preferably, the fastener for fixing the soft packing is provided in three-level anaerobic fermentation room.
Preferably, hole is provided on the cover board of Multi-level deflector formula filter chamber.
Preferably, described turn between water coping and the cover board of Multi-level deflector formula filter chamber has gap.
Preferably, the height for turning over waterwall is less than the height of filtering water outlet, and the height for filtering water outlet was lower than The height of filter influent mouth.
Preferably, two water holes on the sub- fermenting cellar shift to install.
Preferably, the filter plate is horizontally or diagonally arranged.
Preferably, the filter plate is polyurethanes cystosepiment or brown bed class plate.
Preferably, the sanitary sewage purifying biogas generating pit further includes appendix, and one end of the appendix is detested positioned at three-level In aerobe fermentation room, another termination device of air of the appendix.
Preferably, one or more inspection shafts are additionally provided on three-level anaerobic fermentation room.
The beneficial effects of the present invention are:
(1) sanitary sewage purifying biogas generating pit in the present invention has the advantage that with low investment;It may be provided between building Greening is not taken up an area substantially in the following, do not influence to afforest;It does not consume energy, operational management is easy easily to be implemented, and the sludge quantity very little of generation is dirty Mud draws clearly the period up to 3-4, and operating cost is very low;It can solve the problems, such as environmental sanitation, prevent the prevalence and generation that infect disease; The recyclable part energy, realizes resource circulation utilization;
(2) successively sewage precipitated in the present invention, fermented and filtration treatment, going out after significantly improving sewage treatment Water water quality;
(3) soft packing of the setting for strain apposition growth in three-level anaerobic fermentation room, improves fermenting microbe in three-level anaerobism Ferment indoor growing environment, to increase) quantity of fermenting microbe in three-level anaerobic fermentation room, so that fermentation is more filled Point;Snapping is set to fix soft packing simultaneously, can prevent soft packing from flowing away with water flow;
(4) multiple sub- fermenting cellars constitute folding shape fermentation channel, extend the flow path of sewage, increase sewage and fermenting microbe Time of contact so that fermentation is more abundant, also more thoroughly to the processing of sewage;
(5) in sub- filter chamber, sewage filters out suspended particulate substance in baffling filtering area first, then precipitates in gravity settling zone, Improve the filter effect to sewage;
(6) waterwall is turned over by setting, keeps contact of the sewage with air more abundant, improve the effect of removal ammonia nitrogen and hydrogen sulfide;
(7) it is provided with hole on the cover board of Multi-level deflector formula filter chamber, the simultaneous oxygen environment of Multi-level deflector formula filter chamber can be maintained, it can Further degradation digests the suspended matter in sewage under the action of mixotroph, filters Multi-level deflector formula by the second partition wall Room forms baffling channel, extends residence time of the sewage in Multi-level deflector formula filter chamber, so that simultaneous aerobe fermentation is more abundant.
Detailed description of the invention
Fig. 1 is the schematic diagram of one embodiment of the present of invention;
Fig. 2 is the schematic diagram of A-A section in Fig. 1;
Fig. 3 is the schematic diagram of B-B section in Fig. 1;
Fig. 4 is the schematic diagram of C-C section in Fig. 1;
Fig. 5 is the schematic diagram of D-D section in Fig. 1;
Fig. 6 is the schematic diagram of E-E section in Fig. 1;
In figure, 1-buffering cinder pocket, 2-three-level anaerobic fermentation rooms, the 21-the first partition wall, 22-inspection shafts, 23-soft packings, 3-Multi-level deflector formula filter chambers, the 31-the second partition wall, 32-turn over waterwall, 33-filter plates, 34-baffling filtering areas, 35-weights Power settling zone, 4-appendixs.
Specific embodiment
Below in conjunction with embodiment, technical solution of the present invention is clearly and completely described, it is clear that described Embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field Technical staff's every other embodiment obtained under the premise of not making the creative labor belongs to what the present invention protected Range.
Refering to fig. 1-6, the present invention provides a kind of sanitary sewage purifying biogas generating pit:
As shown in Figure 1, sanitary sewage purifying biogas generating pit, including buffering cinder pocket 1,2 and of three-level anaerobic fermentation room being sequentially connected to Multi-level deflector formula filter chamber 3 successively carries out sediment, fermentation and filtration treatment to sewage, the water quality that improves that treated.
As shown in Fig. 2, the sanitary sewage purifying biogas generating pit further includes appendix 4, one end of the appendix 4 is located at three In grade anaerobic fermentation room 2, another termination device of air of the appendix 4, appendix 4 is used for will be in three-level anaerobic fermentation room 2 The biogas of generation is discharged, and air valve can be set on the appendix 4, for controlling exhaust velocity.
Preferably, the buffering cinder pocket 1 can only include a sub- cinder pocket, also may include multiple being sequentially connected to Sub- cinder pocket, buffering cinder pocket 1 carry out sediment processing to sewage, the solid particle in sewage are removed, by nothings such as sandstones therein Machine object sedimentation basin bottom, convenient for periodically drawing clearly, and labile organic compound enters three-level anaerobic fermentation room 2.
Three-level anaerobic fermentation room 2 is divided into multiple sub- fermenting cellars being sequentially connected to, Duo Gezi by the first partition wall 21 Fermenting cellar constitutes the fermentation channel of folding shape, extends flow path of the sewage in three-level anaerobic fermentation room 2, and then increase dirt The time of contact of water and fermenting microbe, so that it is more abundant to the fermentation of suspended matter in sewage, it improves from three-level anaerobic fermentation room 2 The water quality of the water of discharge.The fermentation water inlet being connected to buffering cinder pocket 1 is provided on the side wall of first sub- filter chamber, last The fermentation water outlet being connected to Multi-level deflector formula filter chamber 3 is provided on the side wall of a sub- filter chamber;Between adjacent sub- fermenting cellar Water hole is provided on first partition wall 21, two water holes of sub- fermenting cellar shift to install, exist to further increase sewage Residence time in three-level anaerobic fermentation room 2.
As shown in Figure 3 and Figure 4, the soft packing 23 for strain apposition growth is provided in three-level anaerobic fermentation room 2, Described soft packing 23 such as A1-E1, A2-E2 are provided with for fixing the soft packing 23 in three-level anaerobic fermentation room 2 Fastener;Fermenting microbe, which can be attached in soft packing 23, to be grown, and fermenting microbe in three-level anaerobic fermentation room 2 can be effectively increased Quantity improves three-level anaerobic fermentation room 2 to the attenuation degree of suspended matter in sewage;Fastener then can prevent soft packing 23 with dirt Water flows away or shakes the case where causing anaerobic bacteria to fall off.
In three-level anaerobic fermentation room 2, by the first partition wall 21 and water hole formed in descended water reaction unit, due to adopting The techniques such as water reaction unit, advanced water-flow equation technology and high-performance soft packing 23 are crossed with Liao Zhong lower layer, make anaerobe Sufficiently enrichment and reduction is lost, and ensure that anaerobe own metabolism environmental condition.
Multi-level deflector formula filter chamber 3 multiple sub- filter chambers being sequentially connected to, first son are given by the second partition wall 31 It is provided with the filtered water inlet mouth being connected to three-level anaerobic fermentation room 2 on the side wall of filter chamber, is set on the side wall of last sub- filter chamber It is equipped with filtering water outlet, hole is set between two neighboring sub- filter chamber.As shown in Figure 5 and Figure 6, the sub- filter chamber is by turning over water Wall 32 is divided into baffling filtering area 34 and gravity settling zone 35, and the height for turning over waterwall 32 is less than the height of filtering water outlet, And the height for filtering water outlet is lower than the height of filtered water inlet mouth.
The baffling filtering area 34 is connected to gravity settling zone 35, and the baffling filtering area 34 is divided by filter plate 33 Underlying sludge settling area and the clear water zone being located above, baffling filters sewage from lower to upper, and filter plate 33 is for retaining Suspended matter.The filter plate 33 is polyurethanes cystosepiment or brown bed class plate, and the filter plate 33 is horizontally disposed or is obliquely installed. Hole between the sub- filter chamber and previous sub- filter chamber is located at the sludge settling area of the sub- filter chamber, the sub- filter chamber and the latter Hole between sub- filter chamber is located at the gravity settling zone 35 of the sub- filter chamber, and described hole is preferably provided at the bottom of the second partition wall 31 Portion, gravity settling zone 35 makes the sewage filtered by filter plate 33 again by gravity precipitating sludge, and sewage is by base apertures Hole enters the sub- filter chamber of next stage.The baffling filtering area 34 be connected to gravity settling zone 35 can there are many, for example, described turn over water There is gap between the top of wall 32 and the cover board of Multi-level deflector formula filter chamber 3, or (is somebody's turn to do in the top setting through-hole for turning over waterwall 32 Through-hole need to be located at the top of filter plate 33).
The working principle of the present embodiment are as follows: sewage initially enters buffering cinder pocket 1 and carries out precipitation process, passes through the side of precipitating Formula removes the solid particle in sewage, by the inorganic depositions bottom of pond such as sandstone therein, convenient for periodically drawing clearly, and it is degradable organic Object enters three-level anaerobic fermentation room 2.In three-level anaerobic fermentation room 2 under the action of anaerobe, organic matter is through liquefaction, acid The simple material with water and methane (CH4, CO2) etc. for primary product is degraded to after change, three stage of methanation;Due to three-level anaerobism Middle lower layer is used in fermenting cellar 2 crosses the techniques such as water reaction unit, advanced water-flow equation technology and high-performance soft-filler, It is enriched with anaerobe sufficiently and reduces its loss, ensure that anaerobe own metabolism environmental condition, go out methane-generating pit Water water quality further increases.The biogas generated in three-level anaerobic fermentation room 2 is discharged by appendix 4, after the fermented processing of sewage Into Multi-level deflector formula filter chamber 3.When sewage flows through every sub- filter chamber, the sludge settling area of sub- filter chamber is initially entered, it is then dirty Water enters clear water zone through filter plate 33 by sludge settling area, and biggish suspended matter is intercepted by filter plate 33 in sewage, stays in sludge Settling zone, sewage enter gravity settling zone 35 by turning over waterwall 32 by clear water zone, are precipitated again under gravity, so Enter next sub- filter chamber afterwards, and so on, finally from the water outlet discharge of last sub- filter chamber, realize multistage collapsible Filtering.
Preferably, it is provided with hole on the cover board of Multi-level deflector formula filter chamber 3, so that Multi-level deflector formula filter chamber 3 Can maintain and oxygen environment, mixotroph can survive in Multi-level deflector formula filter chamber 3 and to the suspended matter in sewage carry out into The degradation of one step digests, and improves effluent quality.Multiple sub- filter chambers constitute folding shape filtration channel, extend sewage in Multi-level deflector Residence time in formula filter chamber 3, so that simultaneous aerobe fermentation is more abundant.Simultaneously as sewage will do it and turn in every sub- filter chamber Turn, sewage comes into full contact with air, so that simultaneous aerobe fermentation is more abundant, improves effluent quality.
Preferably, one or more inspection shafts 4 are additionally provided on three-level anaerobic fermentation room 2, user can pass through inspection Look into the timely situation about understanding in three-level anaerobic fermentation room 2 of well 4.
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention It is interior.

Claims (10)

1. sanitary sewage purifying biogas generating pit, which is characterized in that including buffering cinder pocket (1), the three-level anaerobic fermentation being sequentially connected to Room (2) and Multi-level deflector formula filter chamber (3), three-level anaerobic fermentation room (2) are divided into multiple suitable by the first partition wall (21) The sub- fermenting cellar of secondary connection, multiple sub- fermenting cellars constitute the fermentation channel of folding shapes, first between two neighboring sub- fermenting cellar every It is provided with water hole on wall (21), the soft packing for strain apposition growth is provided in three-level anaerobic fermentation room (2) (23);
Multiple sub- filter chambers being sequentially connected to, multiple sub- filters are given by the second partition wall (31) in Multi-level deflector formula filter chamber (3) Room constitutes folding shape filtration channel, is provided with filtered water inlet mouth on the side wall of first sub- filter chamber, the side wall of last sub- filter chamber On be provided with filtering water outlet, hole is set between two neighboring sub- filter chamber, and the sub- filter chamber is separated by turning over waterwall (32) For baffling filtering area (34) and gravity settling zone (35), the baffling filtering area (34) is connected to gravity settling zone (35), described Baffling filtering area (34) is described by the clear water zone that filter plate (33) are divided into underlying sludge settling area and are located above Hole between sub- filter chamber and previous sub- filter chamber is located at the sludge settling area of the sub- filter chamber, and the sub- filter chamber and latter height are filtered Hole between room is located at the gravity settling zone (35) of the sub- filter chamber.
2. sanitary sewage purifying biogas generating pit according to claim 1, which is characterized in that three-level anaerobic fermentation room (2) Inside it is provided with the fastener for fixing the soft packing (23).
3. sanitary sewage purifying biogas generating pit according to claim 1, which is characterized in that Multi-level deflector formula filter chamber (3) hole is provided on cover board.
4. sanitary sewage purifying biogas generating pit according to claim 3, which is characterized in that the top for turning over waterwall (32) with There is gap between the cover board of Multi-level deflector formula filter chamber (3).
5. sanitary sewage purifying biogas generating pit according to claim 1, which is characterized in that the height for turning over waterwall (32) is small In the height of filtering water outlet, and the height for filtering water outlet is lower than the height of filtered water inlet mouth.
6. sanitary sewage purifying biogas generating pit according to claim 1, which is characterized in that two mistakes on the sub- fermenting cellar Water hole shifts to install.
7. sanitary sewage purifying biogas generating pit according to claim 1, which is characterized in that the filter plate (33) is horizontal or inclines Tiltedly setting.
8. sanitary sewage purifying biogas generating pit according to claim 1, which is characterized in that the filter plate (33) is polyurethane Class A foam A plate or brown bed class plate.
9. sanitary sewage purifying biogas generating pit according to claim 1, which is characterized in that the sanitary sewage purifying biogas generating pit Further include appendix (4), one end of the appendix (4) is located in three-level anaerobic fermentation room (2), the appendix (4) it is another One termination uses device of air.
10. sanitary sewage purifying biogas generating pit according to claim 1, which is characterized in that three-level anaerobic fermentation room (2) On be additionally provided with one or more inspection shafts (22).
CN201811150756.9A 2018-09-29 2018-09-29 Sanitary sewage purifying biogas generating pit Pending CN109250817A (en)

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CN201811150756.9A CN109250817A (en) 2018-09-29 2018-09-29 Sanitary sewage purifying biogas generating pit

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CN1631817A (en) * 2003-12-22 2005-06-29 农业部沼气科学研究所 Integrated anaerobic-wetland wastewater treatment apparatus and method therefor
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