CN102311170B - Non-powered domestic sewage treatment plant - Google Patents
Non-powered domestic sewage treatment plant Download PDFInfo
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- CN102311170B CN102311170B CN2011102264759A CN201110226475A CN102311170B CN 102311170 B CN102311170 B CN 102311170B CN 2011102264759 A CN2011102264759 A CN 2011102264759A CN 201110226475 A CN201110226475 A CN 201110226475A CN 102311170 B CN102311170 B CN 102311170B
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- 239000010865 sewage Substances 0.000 title claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000004033 plastic Substances 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 239000011152 fibreglass Substances 0.000 claims abstract description 5
- 239000012528 membrane Substances 0.000 claims description 16
- 238000012856 packing Methods 0.000 claims description 13
- 239000011449 brick Substances 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000005374 membrane filtration Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 19
- 244000005700 microbiome Species 0.000 description 7
- 241000196324 Embryophyta Species 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000000813 microbial effect Effects 0.000 description 5
- 239000002957 persistent organic pollutant Substances 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 210000000476 body water Anatomy 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- -1 dissolve and purify Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate 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
- 230000001902 propagating effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
Abstract
The invention discloses a non-powered domestic sewage treatment plant, comprising a reaction tank consisting of steel plates or glass reinforced plastics or plastic plates or brick-concrete constructions, wherein, the reaction tank is divided into an air water reinforced contact zone, a biological reaction zone, and a biofiltration zone; the air water reinforced contact zone is provided with a perforating water distributor, a perforating inclined plate, an air-supply pipe, a vent window, and an air suction duct; the biological reaction zone is filled with biological filling material; and the biofiltration zone is provided with one or more sets of slots, self-forming dynamic membrane filtration frames which can move up and down are inserted in the slots, and the water exit of the biofiltration zone is provided with a water outlet valve. The invention has the advantages of simple structure, small land occupation area, low investment, good processing effect, no need of power, no need of electric power, no need of operation cost, no need of person operation and management, and the like, and is suitable for villages and small towns, especially meeting the usage of domestic sewage treatment in remote mountain areas with relative backward economy and no guarantee of power supply.
Description
Technical field
The invention belongs to technical field of sewage, particularly be applicable to a kind of motorless sewage treatment unit of samll cities and towns and domestic sewage in rural areas by using dispersion treatment.
Background technology
Develop rapidly along with socioeconomic; ecotope also has been subject to destruction simultaneously; natural water pollutes with eutrophication day by day serious; particularly in some remote districts and relatively poor samll cities and towns and the rural area of economic condition; because village, village dwelling house disperses; sanitary sewage is difficult for focusing on; the standard of living of adding these samll cities and towns and rural area is relative backward; majority resident resident family; the sewage of village, village peasant household is not done any processing or is only just directly discharged through the septic tank simple process; so that the physical environment situation worsens more; the pollution of samll cities and towns and domestic sewage in rural areas by using; become the major issue that the current environment protection must solve, thereby the method that is used for samll cities and towns and rural domestic sewage treatment is released one after another; wherein modal is the artificial swamp method, the existing Artificial Wetland Techniques that the below retrieves:
Chinese patent ZL 200620087078.2 artificial devices, this invention is by comprising main body, plate washer, matrix, soil layer and plant, main body is comprised of some unit, in each unit, sewage enters from top, through plant, soil layer, a side group matter, opposite side matrix, soil layer, plant are flowed out, liquid form is followed successively by surface stream, from top to bottom vertical current, horizontal drowned flow, from the bottom to top vertical current, surface stream, enter next unit after, repeat again above process.
200620084961.6 1 kinds of novel drowned flow artificial wet lands of Chinese patent ZL, this invention includes a body, inner bottom-up water layer, support net, packing layer and the soil layer of being provided with successively of bed body, the support net is supported by the bearing wall that is located in the water layer, be provided with the cloth tank at bed body front end, end is provided with waterwall, and the waterwall right side is provided with water leg.Sewage enters the cloth tank during work, perforation through the bed wall flows into packing layer, sewage infiltrates to upper layer of soil lentamente, microorganism breeds near soil and plant root district, the material of suspended matter, colloid and dissolved state in the further planar water, form one deck microbial film, the organism in the sewage is decomposed by microorganism aerobic.Simultaneously, but waterplant absorption portion nitrogen, phosphorus carry out advanced treatment as nutritive substance to sewage.
Chinese patent ZL 200620058427.8 sewage combined artificial wetland ecological treatment systems, it is characterized in that: system from top to bottom arranges sewage routeway successively step by step by the foundation landform, can remove tiny sandstone and the settling tank of various suspended particulates, can remove the organism of difficult degradation in particulate matter larger in the sewage and gunk and the absorption sewage and the adjusting hydrolytic tank of heavy metal, the multistage wetland of propagating artificially of filling cultivation matrix and planting plants consists of, each facility is communicated with by the water route successively, and the water outlet of each facility flows into the facility in next stage low level zone naturally according to terrain slope.
Artificial marsh sewage treating method is because process structure is simple, less investment, convenient operation and management, working cost is low, in samll cities and towns and rural area, generally uses, but the artificial swamp method, exist bar none but that floor space is large, biological process is incomplete, pollutant load is low, the shortcoming such as fluctuation of service, hydraulic performance are poor enjoys amblent air temperature and seasonal effect, and treatment effect is not ideal enough, be difficult to reach the effluent quality requirement of expection, even can become another new source of pollution.
For this reason, the inventor herein proposes a kind of self-forming dynamic membrane biological respinse waste disposal plant patent on March 21st, 2011, number of patent application: 201110067579.X, be used for samll cities and towns and rural domestic sewage treatment, can overcome the shortcoming of artificial marsh sewage treating method, but, sewage aerobic reaction process in this process unit, to adopt the blast aeration mode, need to be equipped with electrical source of power and certain working cost, thereby this patented technology in the place that can not guarantee supply of electric power the relative remote countryside mountain area that falls behind with economic condition, can't normally move use, also hindered its popularization and development.
Summary of the invention
The objective of the invention is for above-mentioned the deficiencies in the prior art, a kind of motorless sewage treatment unit is provided, can overcome the shortcoming of above-mentioned sewage water treatment method, it has simple in structure, take up an area less, reduced investment, treatment effect are good, unpowered, do not need electric power, do not need working cost, do not need the in many ways advantage such as special messenger's operational administrative, extremely be adapted at rural area, small towns, particularly the sanitary sewage in can not guaranteeing the relative remote mountain areas that falls behind with economic condition of supply of electric power disperses to process use.
The present invention is by steel plate or by glass reinforced plastic or by plastic plate or a reaction tank being made of brick mixed building, and reaction tank is divided into air water and strengthens zone of action, bio-reaction zone, biofiltration district totally three sewage disposal intervals.The zone of action is strengthened for air water in the reaction tank upper end, the interval in-built perforation water distributor that is equipped with, the perforation swash plate, blast pipe, vent window and draw airduct, have the ventilation hole of several go-no-gos on the perforation swash plate inclined-plane, the vertical plane of a front swash plate upper edge and a rear swash plate lower edge overlaps, swash plate upper edge and water distributor approach, lower edge and the pond water surface approach, the pond body of strengthening lower end between the zone of action is bio-reaction zone, device has the special bio filler in the bio-reaction zone, divided into the mouth of a river, crossing pond, side, mouth of a river body is biological filtrating area, be provided with one group or some group slots in the biofiltration district, insert self-forming dynamic membrane filter frame movable up and down in the slot, self-forming dynamic membrane be with a kind of high strength filter net cloth device on framework, and in the insertion slot, in order to filter the sewage of coming from bio-reaction zone, in filtration procedure, microorganism in the sewage and suspended solid particle constantly assembly are attached on the filter screen, form gradually the biomass filtering layer of self-sow, be self-forming dynamic membrane, after self-forming dynamic membrane forms, can carry out the hurdle to the suspended substance in the sewage cuts filtration on the one hand, the hurdle can be cut down again on the one hand the organic pollutant that comes and carry out biological decomposition, the interval water outlet of biofiltration is equipped with outlet valve, outlet valve is used for the emission treatment water outlet, control pond water liquid level, the pond body water surface is remained on can the submergence biologic packing material and don't exceed on the position of blast inlet.
Sewage enters into air water from water distributor and strengthens the zone of action, air also enters into air water reinforcement zone of action from the air intake cylinder simultaneously, air forms more powerful air-flow under the pull effect of drawing air duct, air-flow fully contacts with sewage by perforation swash plate aperture, and impact mutually, cutting, mix, greatly increased the dissolved oxygen amount of sewage, and constantly unrestrained in the biological respinse interval, these contain oxygen sewage provides abundant carbon source and oxygen source to the microorganism in the biologic packing material, again by biological cultivation, in biologic packing material, formed microbial film, microbial film constantly carries out biological adsorption to the organic pollutant in the sewage, dissolve and purify, sewage after biology is dissolved enters into the biofiltration district again and carries out filtration treatment, efflux finally by outlet valve, formed an aerobic-oxygen-anoxic of holding concurrently and nitrated-denitrifying biology and dissolved and the process of denitrogenating, in this process, the COD in the sewage, HN
3-N and other organic pollutants obtain to remove synchronously.
Operation through one period, along with the continuous growth and breeding of microorganism and suspended substance constantly adhere to accumulation, the effluent flux of self-forming dynamic membrane diminishes gradually, at this moment the self-forming dynamic membrane filter frame can be extracted out from slot, with water purification the part dirt settling is rinsed out, again assign again, can recover water flux.
Description of drawings
Fig. 1 is structural principle synoptic diagram of the present invention.
Identify among the figure: 1-reaction tank pond body, 2-performance review mouth, the 3-water distributor of boring a hole, the 4-swash plate of boring a hole, the 5-blast pipe, the 6-vent window, 7-draws airduct, the 8-biologic packing material, 9-crosses the mouth of a river, 10-slot, 11-self-forming dynamic membrane filter frame, 12-outlet valve.
Embodiment
As shown in the figure, reaction tank pond body 1 is by steel plate, or by glass reinforced plastic, or by plastic plate, or consisted of by brick mixed building, body top, pond offers working hole 2, body top, pond is that air water is strengthened the zone of action, the interval in-built perforation water distributor 3 that is equipped with, perforation swash plate 4, blast pipe 5, vent window 6 and draw air duct 7, it is bio-reaction zone that air water is strengthened the lower end, zone of action, device has biologic packing material 8 in the bio-reaction zone, divided into the mouth of a river 9, pond, side body is biological filtrating area, the biofiltration interval is provided with one group or some group slots 10, insert self-forming dynamic membrane filter frame 11 movable up and down in the slot, outlet valve 12 is equipped with in water outlet place in biofiltration interval.
Technological process of the present invention is as follows: reaction tank body 1 consists of by steel plate or by glass reinforced plastic or by plastic plate or by brick mixed building, body top, pond offers working hole 2, working hole 2 effects are conveniently to enter Chi Tizhong sewage treatment facility is installed, and also are convenient to pick up in operational process and look into maintenance.Sewage enters into air water from water distributor 3 and strengthens the zone of action, perforation swash plate 4 during strengthening between the zone of action, air water is housed, have the ventilation hole of several go-no-gos on its inclined-plane, the vertical plane of a front swash plate top and a rear swash plate bottom overlaps, swash plate upper edge and water distributor approach, lower edge and the pond water surface approach, air also enters between air water reinforcement zone of action from blast pipe 5 simultaneously, produce more powerful air-flow by vent window 6 and under the pull effect of drawing airduct 7 through the eyelet in the perforation swash plate 4, sewage fully contacts with air-flow on perforation swash plate 4, and impact mutually, cutting, mix, strengthen the air water contact, greatly increased the dissolved oxygen amount of sewage, and constantly unrestrained in the biological respinse interval.Bio-reaction zone is equipped with biologic packing material 8, these contain oxygen sewage provides abundant carbon source and oxygen source to the microorganism in the biologic packing material 8, by biological cultivation, formed microbial film in the biologic packing material 8, microbial film constantly carries out biological adsorption, dissolves and purifies the organic pollutant in the sewage, and the sewage after biology is dissolved enters into the biofiltration district again and carries out biofiltration.Cross 9 places, the mouth of a river slot 10 be housed in the biofiltration district, assigned self-forming dynamic membrane frame 11 in the slot 10, outlet valve 12 is housed, and outlet valve 12 is in order to emission treatment water outlet, control pond water liquid level, and the pond body water surface is remained on can the submergence biologic packing material and don't exceed on the position of blast inlet.Sewage effluxes from outlet valve 12 after 11 filtrations of self-forming dynamic membrane frame and further biochemical treatment, and formed an aerobic-oxygen-anoxic of holding concurrently and nitrated one denitrifying biology and dissolved and the process of denitrogenating, in this process, the COD in the sewage, HN
3-N and other organic pollutants obtain to remove synchronously.
Operation through one period, constantly growth and breeding and suspended substance constantly adhere to accumulation in the self-forming dynamic membrane filter frame along with microorganism, the effluent flux of self-forming dynamic membrane diminishes gradually, at this moment the self-forming dynamic membrane filter frame can be extracted out from slot, with water purification the part dirt settling is rinsed out, again assign again, can recover water flux.
Claims (4)
1. motorless sewage treatment unit, it is characterized in that reaction tank pond body (1) is by steel plate, or by glass reinforced plastic, or by plastic plate, or consisted of by brick mixed building, reaction tank is divided into air water and strengthens the zone of action, bio-reaction zone, the biofiltration district is totally three sewage disposal intervals, body top, pond offers working hole (2), body top, pond is that air water is strengthened the zone of action, the interval in-built perforation water distributor (3) that is equipped with, perforation swash plate (4), blast pipe (5), vent window (6) and draw air duct (7), it is bio-reaction zone that air water is strengthened pond body following between the zone of action, device has biologic packing material (8) in the biological respinse interval, divided into the mouth of a river (9), pond, side body is biological filtrating area, the biofiltration interval is provided with one group or some group slots (10), insert up and down self-forming dynamic membrane filter frame (11) in the slot, the water outlet in biofiltration interval is equipped with outlet valve (12).
2. a kind of motorless sewage treatment unit according to claim 1 has the through hole of a plurality of go-no-gos on the inclined-plane of swash plate (4) that it is characterized in that boring a hole, be abound with on the inclined-plane.
3. a kind of motorless sewage treatment unit according to claim 1 is characterized in that biologic packing material (8) is soft, half soft combined stuffing, or the solid grain of concrete dynamic modulus filtrate.
4. a kind of motorless sewage treatment unit according to claim 1, it is characterized in that self-forming dynamic membrane filter frame (11) is that a kind of high strength screen cloth is fixed on the framework face, frame material is the square framework that steel, timber or plastics are made, and can freely inject and extract out in slot (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102264759A CN102311170B (en) | 2011-08-09 | 2011-08-09 | Non-powered domestic sewage treatment plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102264759A CN102311170B (en) | 2011-08-09 | 2011-08-09 | Non-powered domestic sewage treatment plant |
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| Publication Number | Publication Date |
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| CN102311170A CN102311170A (en) | 2012-01-11 |
| CN102311170B true CN102311170B (en) | 2013-01-02 |
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| CN2011102264759A Active CN102311170B (en) | 2011-08-09 | 2011-08-09 | Non-powered domestic sewage treatment plant |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102887584A (en) * | 2012-09-21 | 2013-01-23 | 江苏北辰环境科技有限公司 | Biofilm structure for sewage treatment |
| CN103212301B (en) * | 2013-04-28 | 2015-01-21 | 哈尔滨工业大学 | Ultrafiltration membrane pool with secondary on-line coagulation function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045582A (en) * | 2007-03-28 | 2007-10-03 | 南京大学 | Overlay sewage biochemical reactor |
| CN101244881A (en) * | 2008-03-07 | 2008-08-20 | 宁波德安生态环保工程有限公司 | Biological reaction pool for wastewater treatment |
| CN101591063A (en) * | 2009-06-19 | 2009-12-02 | 德威华泰（北京）科技有限公司 | Integrated domestic sewage treatment device |
| CN201538734U (en) * | 2009-10-15 | 2010-08-04 | 河南科达节能环保有限公司 | Sewage treatment device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100785044B1 (en) * | 2006-11-09 | 2007-12-12 | 한국과학기술연구원 | Method for remodeling of the existing wastewater treatment facilities into advanced treatment facilities and operating method using the advanced treatment facilities |
| JP5077586B2 (en) * | 2009-03-25 | 2012-11-21 | 株式会社日立プラントテクノロジー | Wastewater treatment water reuse system |
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- 2011-08-09 CN CN2011102264759A patent/CN102311170B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045582A (en) * | 2007-03-28 | 2007-10-03 | 南京大学 | Overlay sewage biochemical reactor |
| CN101244881A (en) * | 2008-03-07 | 2008-08-20 | 宁波德安生态环保工程有限公司 | Biological reaction pool for wastewater treatment |
| CN101591063A (en) * | 2009-06-19 | 2009-12-02 | 德威华泰（北京）科技有限公司 | Integrated domestic sewage treatment device |
| CN201538734U (en) * | 2009-10-15 | 2010-08-04 | 河南科达节能环保有限公司 | Sewage treatment device |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2010-221195A 2010.10.07 |
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Address after: 537100 the Guangxi Zhuang Autonomous Region Guigang City District West Group Box No. 203 City Patentee after: GUIGANG ZHIHONG ENVIRONMENT TECHNOLOGY Co.,Ltd. Address before: 537100 Guigang Avenue, Guigang, the Guangxi Zhuang Autonomous Region, No. 898 Patentee before: GUIGANG ZHIHONG ENVIRONMENT TECHNOLOGY Co.,Ltd. |
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Address after: 537100 the Guangxi Zhuang Autonomous Region Guigang City District West Group Box No. 203 City Patentee after: GUANGXI GUOHONG ZHIHONG ENVIRONMENTAL TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 537100 Guigang Avenue, Guigang, the Guangxi Zhuang Autonomous Region, No. 898 Patentee before: GUIGANG ZHIHONG ENVIRONMENT TECHNOLOGY Co.,Ltd. |
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Address after: 537100 the Guangxi Zhuang Autonomous Region Guigang City District West Group Box No. 203 City Patentee after: Guangxi Guohong Zhihong Environmental Protection Technology Group Co.,Ltd. Address before: 537100 the Guangxi Zhuang Autonomous Region Guigang City District West Group Box No. 203 City Patentee before: GUANGXI GUOHONG ZHIHONG ENVIRONMENTAL TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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Application publication date: 20120111 Assignee: Guangxi Guohong Zhihong Water Service Co.,Ltd. Assignor: Guangxi Guohong Zhihong Environmental Protection Technology Group Co.,Ltd. Contract record no.: X2023980048970 Denomination of invention: A non powered domestic sewage treatment device Granted publication date: 20130102 License type: Common License Record date: 20231129 |
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