CN111039507A - Distributed unpowered terrace-type sewage treatment system for mountainous rural areas - Google Patents
Distributed unpowered terrace-type sewage treatment system for mountainous rural areas Download PDFInfo
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- CN111039507A CN111039507A CN201911375257.4A CN201911375257A CN111039507A CN 111039507 A CN111039507 A CN 111039507A CN 201911375257 A CN201911375257 A CN 201911375257A CN 111039507 A CN111039507 A CN 111039507A
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- 239000010865 sewage Substances 0.000 title claims abstract description 103
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 104
- 238000000746 purification Methods 0.000 claims abstract description 56
- 238000004062 sedimentation Methods 0.000 claims abstract description 36
- 239000000945 filler Substances 0.000 claims abstract description 19
- 238000006213 oxygenation reaction Methods 0.000 claims abstract description 13
- 239000008239 natural water Substances 0.000 claims abstract description 4
- 238000012856 packing Methods 0.000 claims description 26
- 238000004140 cleaning Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses a decentralized unpowered terrace-type sewage treatment system for rural areas in mountainous areas, which comprises a septic tank, an adjusting sedimentation tank, a sewage purification device, an effluent sedimentation tank and a wetland, wherein the septic tank, the adjusting sedimentation tank, the sewage purification device, the effluent sedimentation tank and the wetland are sequentially communicated; the septic tank adopts a three-grid septic tank; the adjusting sedimentation tank consists of a tank box and a grid; the sewage purification device comprises a water distribution unit, a filler unit, an oxygenation unit and a water outlet unit; after the sewage in the septic tank is physically treated by the adjusting sedimentation tank and purified by the sewage purification device, the obtained effluent enters the effluent sedimentation tank for preliminary sedimentation and then enters the wetland, and the effluent is further treated in the wetland and then discharged into a natural water body. The decentralized unpowered terrace-type sewage treatment system for the mountainous rural areas, which is provided by the invention, has the advantages of small occupied area, low operation and maintenance technical requirements and low operation and maintenance cost, and basically realizes unattended operation.
Description
Technical Field
The invention relates to the technical field of rural domestic sewage treatment, in particular to a decentralized unpowered terrace-type sewage treatment system in a mountainous rural area.
Background
With the proposition and the push of 'happy villages' and 'toilet revolution', the improvement of rural environment is greatly promoted, and on the premise that the country increasingly attaches importance to environmental protection and the rural relatively centralized village sewage treatment facilities are basically covered, how to treat the decentralized sewage in the rural areas of mountainous areas is a technical problem which needs to be extended urgently at present. The rural decentralized sewage in the mountainous area has the characteristics of small water quantity, intermittent water inflow and high water quality concentration, and simultaneously has the problems of high difficulty in building sewage pipelines, low collection efficiency, high building cost and the like in regions. Aiming at the current situation, the integrated sewage treatment equipment is adopted in part of regions for treatment, but the existing integrated sewage treatment device has higher technical requirements on operation and maintenance personnel and higher operation and maintenance cost, and is not suitable for treatment of rural dispersed sewage in mountain areas, so that the collection rate and the treatment rate of the rural dispersed sewage are lower. The sewage treatment system which has good treatment effect, economic operation and maintenance and is simple is designed to be very necessary for rural areas in mountainous areas.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a decentralized unpowered terrace-type sewage treatment system in rural areas in mountainous areas, which has the advantages of small occupied area, low operation and maintenance technical requirements and low operation and maintenance cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a decentralized unpowered terrace-type sewage treatment system for rural areas in mountainous areas comprises a septic tank, an adjusting sedimentation tank, a sewage purification device, a water outlet sedimentation tank and a wetland, wherein the septic tank, the adjusting sedimentation tank, the sewage purification device, the water outlet sedimentation tank and the wetland are sequentially communicated;
the septic tank adopts a three-grid septic tank;
the adjusting sedimentation tank consists of a tank box and a grid;
the sewage purification device comprises a water distribution unit, a filler unit, an oxygenation unit and a water outlet unit;
after the sewage in the septic tank is physically treated by the adjusting sedimentation tank and purified by the sewage purification device, the obtained effluent enters the effluent sedimentation tank for preliminary sedimentation and then enters the wetland, and the effluent is further treated in the wetland and then discharged into a natural water body.
Furthermore, a water inlet valve is arranged on a pipeline between the adjusting sedimentation tank and the septic tank; and a flow regulating valve is arranged on a pipeline between the regulating sedimentation tank and the sewage purification device.
Further, the sewage purification device is provided with three first-stage sewage purification devices, second-stage sewage purification devices and third-stage sewage purification devices, wherein the heights of the first-stage sewage purification devices, the second-stage sewage purification devices and the third-stage sewage purification devices are gradually reduced, and the first-stage sewage purification devices, the second-stage sewage purification devices and the third-stage sewage purification devices are sequentially communicated in series.
Furthermore, the water distribution unit consists of a first box body, a water inlet pipe, a water distribution pipe, water distribution holes and support rods, wherein the top of the first box body is provided with a water inlet, the bottom of the first box body is opened, and the water distribution pipe is arranged in the first box body; the support rod is connected with the first box body through a bolt; the water inlet pipe penetrates through the water inlet and is communicated with the water distribution pipe; the water distribution pipes are horizontally arranged, and the plane where the water distribution pipes are located is vertical to the water inlet pipe; water distribution holes are distributed on the water distribution pipe, the aperture is 1-3 mm, and the hole-to-hole interval is 15-20 cm.
Furthermore, the filler unit is arranged below the water distribution unit and is in threaded connection with the water distribution unit; the packing box is composed of a second box body, a packing and a packing support frame, wherein the top and the bottom of the second box body are open, the packing support frame is connected with the second box body through bolts, and the appearance of the packing is porous honeycomb; the aperture of the filler is 10-30 mm, and the thickness of the filler is 25-50 cm.
Further, the oxygenation unit is located the packing layer lower part, sets up on the lateral wall of second box, and oxygenation unit includes the air vent of about 5 ~ 10cm of height and can cover the sliding plate of air vent.
Furthermore, the water outlet unit is arranged below the filler unit and comprises a third box body with an opened top, the bottom of the third box body has a certain gradient, a water outlet pipe orifice is arranged on the side wall on the lower side of the gradient, a cleaning water outlet is arranged below the water outlet pipe orifice, and a blind plate is arranged on the outer wall of the upper end of the cleaning water outlet; the water outlet unit is in threaded connection with the packing unit.
Furthermore, the grating is obliquely inserted into the pool box, the oblique insertion angle is 45-60 degrees, and the grating pitch of the grating is 5-10 mm.
Furthermore, plants with certain absorption capacity to nitrogen and phosphorus are planted on the upper part of the sewage purification device.
Further, the gradient is about 2-5 per mill.
The invention has the beneficial effects that:
the sewage flow in the decentralized unpowered terrace sewage treatment system in the mountainous rural area is gravity flow, and the oxygenation unit is in a unpowered automatic oxygenation mode, so that the energy consumption and the operation and maintenance cost of sewage treatment are reduced;
the oxygenation unit can adjust the ventilation volume according to the process requirements, so that different levels of oxygen content are different, and the device has higher treatment efficiency on sewage pollutants;
the tail water treated by the method is used for irrigating plants, so that the growth of the plants can be promoted, the concentration of pollutants in sewage can be further reduced, and the water resource recycling is realized;
the invention provides a device and a method with feasible technology, economy and reasonableness for treating rural distributed sewage in new national rural construction.
Drawings
FIG. 1 is a schematic flow chart of a sewage treatment system according to example 1 of the present invention;
FIG. 2 is a schematic view of the structure of a conditioning settling tank of example 1 of the present invention;
FIG. 3 is a schematic configuration diagram of a sewage purification apparatus of embodiment 1 of the present invention;
FIG. 4a is a layout view of water distribution pipes of the sewage purifying apparatus of embodiment 1 of the present invention; FIG. 4b is a plan view of the supporting bar of the water distributor; fig. 4c is a schematic view of the connection structure between the water distributor support rod and the first tank.
In the figure: 1-a water inlet valve; 2-pool box; 3-a grid; 4-flow regulating valve; 5-a first box body; 6-water inlet; a 7-four-way joint; 8-water distribution pipe; 9-water distribution holes; 10-a second box body; 11-a support bar; 12-a fixing bolt; 13-a filler; 14-a filler support frame; 15-a vent hole; 16-a sliding plate; 17-a third box; 18-water outlet pipe mouth, 19-cleaning water outlet; 20-blind plate.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Example 1:
as shown in fig. 1, a decentralized unpowered terrace-type sewage treatment system for rural areas in mountainous areas comprises a septic tank, a regulating sedimentation tank, a primary sewage purification device, a secondary sewage purification device, a tertiary sewage purification device, an effluent sedimentation tank and a wetland which are sequentially communicated and have gradually reduced elevations; the septic tank adopts a three-grid septic tank; after the sewage in the septic tank is physically treated by the adjusting sedimentation tank and purified by the sewage purification device, the obtained effluent enters the effluent sedimentation tank for preliminary sedimentation and then enters the wetland, and the effluent is further treated in the wetland and then discharged into a natural water body.
The adjusting sedimentation tank consists of a tank box 2 and a grid 3, the grid 3 is obliquely inserted into the tank box 2, the oblique insertion angle is 45-60 degrees, and the grid distance of the grid 3 is 5-10 mm; the grating 3 can be removed and cleaned. A water inlet valve 1 is arranged on a pipeline between the adjusting sedimentation tank and the septic tank; and a flow regulating valve 4 is arranged on a pipeline between the adjusting sedimentation tank and the sewage purification device. The flow regulating valve 4 mainly regulates the sewage inflow of the device, and ensures that the water quantity continuously and uniformly enters.
The sewage purification device comprises a water distribution unit, a filler unit, an oxygenation unit and a water outlet unit; the water distribution unit consists of a first box body 5, a water inlet pipe, water distribution pipes 8, water distribution holes 9 and support rods 11, wherein the top of the first box body is provided with a water inlet 6, the bottom of the first box body is opened, and the water distribution pipes 8 are arranged in the first box body; the water inlet pipe penetrates through the water inlet 6 and is communicated with the water distribution pipe 8 through the four-way joint 7; the water distribution pipes 8 are horizontally arranged, and the plane of the water distribution pipes 8 is vertical to the water inlet pipe; water distribution holes are distributed on the water distribution pipe, the aperture is 1-3 mm, and the hole-to-hole interval is 15-20 cm. The support bar 11 is connected with the first box body through a fixing bolt 12. The water distribution pipe 8 is required to be installed absolutely horizontally, and the uniformity of water distribution is guaranteed.
The filler unit is arranged below the water distribution unit and is in threaded connection with the water distribution unit; the packing box is composed of a second box body 10, packing 13 and a packing support frame 14, wherein the top and the bottom of the second box body are both opened, the packing support frame 14 is connected with the second box body through bolts, the packing 13 is in a porous honeycomb shape, has light weight and a sponge-like body and high specific surface area, has a pore diameter of 5 mm-30 mm, and is processed into various specifications according to process requirements. When the packing is actually designed, the required quantity and type of the packing are calculated according to the quality and quantity of the water entering and exiting the engineering, corresponding stages are placed according to the specification, and the quantity and type of the packing in the period can be adjusted according to the actual operation effect.
The oxygenation unit is located the packing layer lower part, sets up on the lateral wall of second box, and oxygenation unit includes the air vent 15 of height about 5 ~ 10cm and can cover the sliding plate 16 of air vent. The sliding plate can slide outside to select whether to ventilate and the ventilation quantity; the position of the sliding plate 16 is adjusted according to the requirement of the treatment process on oxygen, so that the device is in aerobic, anoxic and anaerobic environments, different pollutants are removed, and the effect of purifying sewage is achieved.
The water outlet unit is arranged below the filler unit and comprises a third box body 17 with an open top, the bottom of the third box body 17 has a certain gradient, the gradient is about 2-5 per mill, a water outlet pipe opening 18 is arranged on the side wall of the lower gradient side, a cleaning water outlet 19 is arranged below the water outlet pipe opening, and a blind plate 20 is arranged on the outer wall of the upper end of the cleaning water outlet; the water outlet unit is in threaded connection with the packing unit. In normal use, the cleaning outlet 19 is sealed with a blind plate 20, thereby allowing the sewage to exit through the outlet nozzle 18. The blind plate 20 is opened during cleaning and sludge discharge, so that sludge and sewage can be discharged quickly.
Each box body of the sewage purification device adopts stainless steel, glass fiber reinforced plastic or a civil structure, and civil engineering needs seepage prevention. Plants (such as reed, iris and the like) with certain absorption capacity to nitrogen and phosphorus are planted at the upper part of the sewage purification device, and the sewage purification device also has the functions of removing peculiar smell and beautifying;
the whole treatment system is connected in series in a terrace-like manner according to the terrain, and the whole system is flexibly assembled and used in different terrain space ranges on the premise of ensuring the treatment effect by increasing and reducing the levels of the sewage purification devices;
the water distribution unit of the sewage purification device is strictly horizontally arranged, so that the flowability and automatic aeration of sewage in the corresponding unit without external power are ensured, and the operation and maintenance cost and the investment of a power lifting device are saved;
the aperture of the filler of the primary sewage purification device is 20-30 mm, and the vent hole of the primary sewage purification device is closed to realize that the primary sewage purification device is in an anoxic environment, wherein the primary sewage purification device mainly comprises hydrolysis acidification and denitrification; the aperture of the filler of the secondary sewage purification device is 10-20 mm, and part of the vent holes are opened to enable the secondary sewage purification device to present an aerobic-anoxic environment from bottom to top, wherein the secondary sewage purification device is mainly used for biologically removing organic matters in sewage; the aperture of the filler of the three-stage sewage purification device is 5-10 mm, and the vent hole is opened to enable the three-stage sewage purification device to be in an aerobic environment, wherein the aperture of the filler of the three-stage sewage purification device is mainly used for removing ammonia nitrogen through nitrification.
After the actual operation of the whole system, statistics shows that the system has higher removal rate on main pollutants in sewage, and the average values of inlet water and outlet water are shown in the following table. The average COD removal rate was 83.6%, the average NH3-N removal rate was 90.0%, and the average TP removal rate was 92.0%.
TABLE 1 effect of this system on sewage treatment
| Index of water quality | CODmg/L | NH3-Nmg/L | TPmg/L |
| Average inlet water quality | 128 | 20 | 2.5 |
| Average water outlet quality | 21 | 2 | 0.2 |
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (10)
1. A decentralized unpowered terrace-type sewage treatment system in rural areas in mountainous areas is characterized by comprising a septic tank, an adjusting sedimentation tank, a sewage purification device, a water outlet sedimentation tank and a wetland, wherein the septic tank, the adjusting sedimentation tank, the sewage purification device, the water outlet sedimentation tank and the wetland are sequentially communicated;
the septic tank adopts a three-grid septic tank;
the adjusting sedimentation tank consists of a tank box and a grid;
the sewage purification device comprises a water distribution unit, a filler unit, an oxygenation unit and a water outlet unit;
after the sewage in the septic tank is physically treated by the adjusting sedimentation tank and purified by the sewage purification device, the obtained effluent enters the effluent sedimentation tank for preliminary sedimentation and then enters the wetland, and the effluent is further treated in the wetland and then discharged into a natural water body.
2. The sewage treatment system of claim 1, wherein a water inlet valve is arranged on a pipeline between the adjusting sedimentation tank and the septic tank; and a flow regulating valve is arranged on a pipeline between the regulating sedimentation tank and the sewage purification device.
3. The sewage treatment system according to claim 2, wherein the sewage purification apparatus comprises three primary sewage purification apparatuses, two secondary sewage purification apparatuses and three tertiary sewage purification apparatuses, each of which is a stepwise-decreasing-in-height sewage purification apparatus, and the primary sewage purification apparatus, the two secondary sewage purification apparatuses and the three tertiary sewage purification apparatuses are connected in series in this order.
4. The sewage treatment system of claim 2 or 3, wherein the water distribution unit comprises a first tank, a water inlet pipe, a water distribution hole and a support rod, the top of the first tank is provided with a water inlet, the bottom of the first tank is open, and the water distribution pipe is arranged in the first tank; the support rod is connected with the first box body through a bolt; the water inlet pipe penetrates through the water inlet and is communicated with the water distribution pipe; the water distribution pipes are horizontally arranged, and the plane where the water distribution pipes are located is vertical to the water inlet pipe; water distribution holes are distributed on the water distribution pipe, the aperture is 1-3 mm, and the hole-to-hole interval is 15-20 cm.
5. The sewage treatment system of claim 2 or 3, wherein the packing unit is disposed below the water distribution unit, and the packing unit is in threaded connection with the water distribution unit; the packing box is composed of a second box body, a packing and a packing support frame, wherein the top and the bottom of the second box body are open, the packing support frame is connected with the second box body through bolts, and the appearance of the packing is porous honeycomb; the aperture of the filler is 10-30 mm, and the thickness of the filler is 25-50 cm.
6. The sewage treatment system of claim 5, wherein the oxygenation unit is disposed on the sidewall of the second tank at a lower portion of the packing layer, and the oxygenation unit includes a vent hole having a height of about 5 to 10cm and a sliding plate covering the vent hole.
7. The sewage treatment system according to claim 2 or 3, wherein the water outlet unit is arranged below the filler unit and comprises a third box body with an open top, the bottom of the third box body has a certain gradient, a water outlet pipe orifice is arranged on the side wall on the side with the lower gradient, a cleaning water outlet is arranged below the water outlet pipe orifice, and a blind plate is arranged on the outer wall of the upper end of the cleaning water outlet; the water outlet unit is in threaded connection with the packing unit.
8. The sewage treatment system according to claim 2 or 3, wherein the grating is obliquely inserted into the tank at an angle of 45 to 60 degrees and has a grating pitch of 5 to 10 mm.
9. The sewage treatment system according to claim 2 or 3, wherein the upper part of the sewage purification apparatus is planted with a plant having a certain absorption capacity for nitrogen and phosphorus.
10. The wastewater treatment system of claim 7, wherein the grade is between about 2% and about 5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911375257.4A CN111039507A (en) | 2019-12-27 | 2019-12-27 | Distributed unpowered terrace-type sewage treatment system for mountainous rural areas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911375257.4A CN111039507A (en) | 2019-12-27 | 2019-12-27 | Distributed unpowered terrace-type sewage treatment system for mountainous rural areas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111892245A (en) * | 2020-08-03 | 2020-11-06 | 岭南水务集团有限公司 | Mountain area unpowered algae rotating biological disk sewage treatment system |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111892245A (en) * | 2020-08-03 | 2020-11-06 | 岭南水务集团有限公司 | Mountain area unpowered algae rotating biological disk sewage treatment system |
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Address after: 100176 9th floor, block T2, Han's Square, yard 2, Ronghua South Road, Yizhuang Economic and Technological Development Zone, Daxing District, Beijing Applicant after: Beijing Beikong Industrial Environmental Technology Co.,Ltd. Address before: 100176 9th floor, block T2, Han's Square, yard 2, Ronghua South Road, Yizhuang Economic and Technological Development Zone, Daxing District, Beijing Applicant before: BEIJING BEIHUA ZHONGQING ENVIRONMENTAL ENGINEERING TECHNOLOGY CO.,LTD. |