CN217418422U - Landfill leachate's resourceful treatment system - Google Patents
Landfill leachate's resourceful treatment system Download PDFInfo
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- CN217418422U CN217418422U CN202123443769.5U CN202123443769U CN217418422U CN 217418422 U CN217418422 U CN 217418422U CN 202123443769 U CN202123443769 U CN 202123443769U CN 217418422 U CN217418422 U CN 217418422U
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Abstract
The utility model relates to a waste water treatment technical field, more specifically say, it relates to a landfill leachate's resourceful treatment system. The key points of the technical scheme are as follows: the complexing extraction unit is used for extracting humic acid in the garbage leachate; a stripping unit for converting humic acid into humate; the evaporation concentration unit is used for concentrating and recovering a humate solution; the catalytic wet oxidation unit is used for oxidizing organic matters remained in the landfill leachate after complexing extraction; the heat conduction oil heating unit is used for heating heat conduction oil to preheat inlet water of the catalytic wet oxidation unit; the tail gas absorption unit is used for washing and adsorbing small molecular carboxylic acid organic matters in the tail gas; the double-salt precipitation unit is used for carrying out a composite reaction on phosphate, ammonia nitrogen and potassium in the landfill leachate to generate magnesium ammonium potassium phosphate precipitate; and the drying unit is used for drying the magnesium ammonium potassium phosphate precipitate. The utility model discloses it only needs complexing extraction, catalysis wet oxidation and double salt to deposit three steps can be with landfill leachate treatment beneficial effect up to standard to have.
Description
Technical Field
The utility model relates to a waste water treatment technical field, more specifically say, it relates to a landfill leachate's resourceful treatment system.
Background
The landfill leachate is associated secondary pollutants of a landfill site, mainly comes from rainfall and internal water content of garbage, the total amount of domestic and industrial garbage is increased with the rapid development of economy in China, and at present, the landfill leachate is mainly treated in a sanitary landfill mode in China, so that a large amount of landfill leachate is generated. The landfill leachate has complex components, high pollutant concentration, high chromaticity and strong toxicity, contains a large amount of organic pollutants and various heavy metal pollutants, and is high-concentration organic wastewater with complex components. If the treatment is improper, the quality of surface water is affected, the safety of underground water is also endangered, and if the surface water is directly discharged into the environment without treatment, serious environmental pollution is caused.
The prior art can solve the problem of harmless treatment of the landfill leachate, but the treatment process is complex, secondary pollutants such as waste residues and waste gases can be generated in the treatment process, and meanwhile, the resource recycling of valuable substances such as ammonia nitrogen, humic acid, potassium and phosphorus in the landfill leachate is less, so that the resource waste is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a not enough to prior art exists, the utility model aims to provide a landfill leachate's resourceful treatment system has simple process, valuable resource recovery and the high advantage of organic matter clearance.
The above technical object of the present invention can be achieved by the following technical solutions: a landfill leachate's resourceful treatment system, its characterized in that includes:
the complexing extraction unit is used for extracting humic acid in the landfill leachate;
the back extraction unit is connected to the complexing extraction unit and is used for converting the humic acid into humate;
the evaporation concentration unit is connected to the complexation extraction unit and is used for concentrating and recovering the humate solution;
the catalytic wet oxidation unit is used for oxidizing the residual organic matters obtained by complexing and extracting in the landfill leachate;
the heat conduction oil heating unit is connected to the catalytic wet oxidation unit and used for heating heat conduction oil to preheat inlet water of the catalytic wet oxidation unit;
the tail gas absorption unit is used for washing and adsorbing small molecular carboxylic acid organic matters in the tail gas;
the double-salt precipitation unit is connected to the double-salt precipitation unit and is used for carrying out a composite reaction on phosphate, ammonia nitrogen and potassium in the landfill leachate to generate a magnesium ammonium potassium phosphate precipitate;
and the drying unit is connected to the double-salt precipitation unit and is used for drying the magnesium ammonium potassium phosphate precipitate.
In one embodiment, the complexing extraction unit comprises a landfill leachate storage tank, an extraction tank and a first standing separation tank which are connected in sequence.
In one embodiment, the back extraction unit comprises a back extraction tank and a second standing separation tank which are connected in sequence, the second standing separation tank is connected with the back extraction tank through a first backflow pipeline, and a first backflow pump is arranged on the first backflow pipeline.
In one embodiment, the evaporation concentration unit comprises an evaporation concentration tank, a water ring vacuum pump, a first condenser, a humate solution storage tank and a distilled water storage tank, wherein a non-condensable gas absorption device is arranged at the front end of a pipeline of the water ring vacuum pump.
In one embodiment, the catalytic wet oxidation unit comprises a wastewater storage tank, a high-pressure water pump, an air compressor, an air storage tank, a gas-liquid mixer, a preheater, a heat exchanger, a reaction tower, a second condenser and a gas-liquid separator which are sequentially connected, wherein a first interlocking shutdown system is arranged between the high-pressure water pump and the air compressor, a second-stage rupture disk device is arranged on the top of the reaction tower, sponge titanium is arranged in the upper cavity and the lower cavity of the reaction tower, and a supported catalyst is arranged in the middle cavity of the reaction tower;
the load type catalyst comprises a noble metal active component, a rare earth metal active component and a transition metal active component, wherein the noble metal active component is arranged above the rare earth metal active component, the rare earth metal active component is arranged above the transition metal active component, a temperature alarm is arranged on the reaction tower, the temperature alarm is connected with a second interlocking stop system, a liquid level alarm is arranged on the top of the reaction tower, and the liquid level alarm is connected with a third interlocking stop system.
In one embodiment, the heat conducting oil heating unit comprises a heat conducting oil storage tank, an electric heater and an expansion tank which are sequentially connected, the expansion tank is connected with the catalytic wet oxidation unit through a second return pipeline, and a second return pump is arranged on the second return pipeline.
In one embodiment, the tail gas absorption unit comprises a plurality of spray absorption towers which are connected in sequence, and the inner cavity of each spray absorption tower is provided with a stainless steel pall ring.
In one embodiment, the double salt precipitation unit comprises a reaction tank, a filter press and a filtrate storage tank which are connected in sequence, wherein the reaction tank is connected with the filter press through a third backflow pipeline, and a third backflow pump is arranged on the third backflow pipeline.
In one embodiment, the drying unit comprises a conveying device and a dryer which are connected in sequence, the drying unit is connected with the catalytic wet oxidation unit through a fourth return pipeline, and a fourth return pump is arranged on the fourth return pipeline.
The resourceful treatment system for the landfill leachate has the following beneficial effects:
firstly, the process is simple, and the landfill leachate can be treated to reach the standard and be discharged only by three steps of complex extraction, catalytic wet oxidation and double-salt precipitation;
secondly, performing resource recovery on valuable substances such as ammonia nitrogen, humic acid, potassium, phosphorus and the like in the landfill leachate;
thirdly, the organic matter removal rate is high, the COD removal rate reaches more than 99 percent, and in the process, waste residue and NO are basically not generated x 、SO 2 And harmful gases such as HCl.
Drawings
Fig. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically limited otherwise.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
A landfill leachate recycling system, as shown in fig. 1, comprising: the complexing extraction unit is used for extracting humic acid in the landfill leachate; the back extraction unit is connected to the complexing extraction unit and is used for converting the humic acid into humate; the evaporation concentration unit is connected to the complexing extraction unit and is used for concentrating and recovering humate solution; the catalytic wet oxidation unit is used for oxidizing the residual organic matters obtained by complexing and extracting in the landfill leachate; the heat conduction oil heating unit is connected to the catalytic wet oxidation unit and used for heating heat conduction oil to preheat inlet water of the catalytic wet oxidation unit; the tail gas absorption unit is connected to the catalytic wet oxidation unit and is used for washing and adsorbing small molecular carboxylic acid organic matters in the tail gas; the double-salt precipitation unit is used for carrying out a composite reaction on phosphate, ammonia nitrogen and potassium in the landfill leachate to generate magnesium ammonium potassium phosphate precipitate; and the drying unit is connected to the double-salt precipitation unit and is used for drying the magnesium ammonium potassium phosphate precipitate.
Pumping the landfill leachate into a complexing extraction unit through a water pump, and carrying out complexing extraction on the landfill leachate, sulfuric acid and an extracting agent to extract humic acid in the landfill leachate; after the extraction reaction is completed, the aqueous phase and the organic phase are separated. And (3) allowing the organic phase to enter a back extraction unit, performing back extraction with a sodium hydroxide solution, converting humic acid in the organic phase into sodium humate, and recovering an extracting agent. And after the back extraction reaction is finished, standing and separating the solution, wherein the separated organic phase is the extracting agent, the separated water phase enters an evaporation concentration unit, heating steam and vacuumizing are performed, and water is evaporated to obtain the sodium humate concentrated solution. And (3) pressurizing the water outlet of the complexing extraction unit and air, and then simultaneously feeding the water outlet and the air into the catalytic wet oxidation unit for mixing to form a cold air-liquid mixed material. Then the temperature of the landfill leachate is raised to the lowest initial temperature of the catalytic wet reaction by preheating the heat conducting oil, the catalytic wet oxidation reaction is carried out, and the organic matters in the landfill leachate are oxidized into CO 2 、H 2 O, micromolecular carboxylic acid and the like, and releases a large amount of heat, and the hot gas-liquid mixed material after reaction is heated firstly, so that the self-heat balance of the catalytic wet oxidation unit is realized; and then exchanging heat with hot water of a drying unit, further utilizing the waste heat of the catalytic wet oxidation reaction, finally separating a gas-liquid mixture, introducing the gas into a tail gas absorption unit, and finally emptying after reaching the standard. The effluent of the catalytic wet oxidation unit enters a double-salt precipitation unit, phosphoric acid and magnesium salt are sequentially added for double-salt precipitation reaction, and after the reaction is finished, magnesium ammonium potassium phosphate ((NH) in the solution is separated by filter pressing 4 MgPO 4 ·6H 2 O)4·KMgPO 4 ·6H 2 O). And (4) drying the filter cake in a drying unit to obtain an ammonium magnesium potassium phosphate product, and finally discharging the filtrate after reaching the standard.
Preferably, the complexing extraction unit comprises a landfill leachate storage tank, an extraction tank and a first standing separation tank which are connected in sequence. The garbage leachate storage tank is provided with a liquid level meter; the extraction tank comprises a stirring device, a pH meter, a thermometer and a medicament adding port, and the medicament is pumped by a mechanical diaphragm metering pump. Pumping the landfill leachate into an extraction tank of a complex extraction unit by a water pump, and sequentially pumping sulfuric acid and an extracting agent by using a mechanical diaphragm metering pump for complex extraction to extract humic acid in the landfill leachate; and pumping the solution into a first standing separation tank by a water pump after the extraction reaction is finished, and separating a water phase from an organic phase.
Preferably, the back extraction unit comprises a back extraction tank and a second standing separation tank which are sequentially connected, the second standing separation tank is connected with the back extraction tank through a first backflow pipeline, and a first backflow pump is arranged on the first backflow pipeline. The back extraction tank comprises a stirring device, a pH meter, a thermometer and a medicament adding port, and the medicament is pumped in by adopting a mechanical diaphragm metering pump; pumping the organic phase into a back extraction tank in a back extraction unit by a water pump, pumping a sodium hydroxide solution into the back extraction unit by a mechanical diaphragm metering pump for back extraction, converting humic acid in the organic phase into sodium humate, and recovering an extracting agent. And after the back extraction reaction is finished, pumping the solution into a standing separation tank by a water pump, wherein the separated organic phase is the extractant, and pumping into an extraction tank by the water pump.
Preferably, the evaporation concentration unit comprises an evaporation concentration tank, a water ring vacuum pump, a first condenser, a humate solution storage tank and a distilled water storage tank, and the front end of the water ring vacuum pump pipeline is provided with a non-condensable gas absorption device. The evaporation concentration tank is a jacket enamel kettle and is provided with a thermometer, a vacuum gauge and a liquid level meter; the humate solution storage tank comprises a stirring device, a thermometer and a liquid level meter; the distilled water storage tank comprises a thermometer, a liquid level meter and a sampling port; pumping the separated water phase into an evaporation concentration tank of an evaporation concentration unit through a water pump, respectively heating and vacuumizing by adopting a steam and water ring vacuum pump, condensing the evaporated water to a distilled water storage tank through a condenser, and discharging the evaporation concentration liquid to a humate solution storage tank.
Preferably, the catalytic wet oxidation unit comprises a wastewater storage tank, a high-pressure water pump, an air compressor, an air storage tank, a gas-liquid mixer, a preheater, a heat exchanger, a reaction tower, a second condenser and a gas-liquid separator which are connected in sequence, a first interlocking shutdown system is arranged between the high-pressure water pump and the air compressor, a second-stage rupture disk device is arranged at the top of the reaction tower, sponge titanium is arranged in the upper cavity and the lower cavity of the reaction tower, a supported catalyst is arranged in the middle cavity of the reaction tower and comprises a noble metal active component, a rare earth metal active component and a transition metal active component, the noble metal active component is arranged above the rare earth metal active component, the rare earth metal active component is arranged above the transition metal active component, a temperature alarm is arranged on the reaction tower and connected with a second interlocking shutdown system, and a liquid level alarm is arranged on the tower top of the reaction tower and connected with a third interlocking stop system.
The waste water storage tank is provided with a liquid level meter; the high-pressure water pump is a plunger pump and is provided with a pressure gauge and a flowmeter; the gas storage tank comprises a pressure gauge and a flowmeter; the preheater, the heat exchanger and the condenser are all sleeve type heat exchangers and are provided with a pressure gauge and a thermometer; the gas-liquid separator comprises a pressure gauge, a flowmeter and a thermometer; an interlocking shutdown system is arranged between the high-pressure plunger pump and the air compressor, and when the high-pressure plunger pump does not work, the power supply of the air compressor is automatically cut off; the reaction tower is provided with an alarm and interlocking system, when the temperature and the pressure of the reaction tower are abnormal, the system can give an alarm, and if the reaction tower runs at an excessive temperature or an excessive pressure, the system is automatically started after being interlocked and stopped; the top of the reaction tower is provided with a liquid level meter and is provided with an alarm and an interlock, when the liquid level at the top of the reaction tower drops, the system can give an alarm, and if the liquid level is lower than the catalyst, the system is automatically started when the system is stopped in the interlock mode.
The pressure of the effluent of the complexing extraction unit is increased by a high-pressure plunger pump, and the effluent and high-pressure air discharged by an air compressor enter a gas-liquid mixer in the catalytic wet oxidation unit to be mixed to form a cold gas-liquid mixed material. Firstly, heat exchange is carried out between the catalyst and thermal conductive oil through a preheater, so that the temperature of the catalyst is raised to the lowest initial temperature of catalytic wet reaction; then enters a reaction tower from the bottom of the tower, and carries out catalytic wet oxidation reaction under the action of a noble metal-rare earth metal-transition metal three-active-component supported catalyst to oxidize organic matters in the landfill leachate into CO 2 、H 2 O and small carboxylic acids, etc., and release a large amount of heat. The hot gas-liquid mixed material from the top of the reaction tower is heated by a heat exchanger to cool gas-liquid mixed material, so that the self-heat balance of the catalytic wet oxidation unit is realized; then the heat is exchanged with the hot water of the dryer through the condenser, and further the heat is exchangedAnd (4) utilizing the residual heat of the catalytic wet oxidation reaction. Finally, the gas-liquid mixed material is separated by a gas-liquid separator,
preferably, the heat conducting oil heating unit comprises a heat conducting oil storage tank, an electric heater and an expansion tank which are sequentially connected, the expansion tank is connected with the catalytic wet oxidation unit through a second return pipeline, and a second return pump is arranged on the second return pipeline. The heat conducting oil storage tank is provided with a liquid level meter; the electric heater comprises a thermometer, an ammeter, a voltmeter and an overload protection device; the expansion tank includes a flow meter and a thermometer.
The heat conducting oil is firstly pumped into an expansion tank from a heat conducting oil storage tank in a heat conducting oil heating unit through a circulating pump, is heated by an electric heater and then exchanges heat with a cold air liquid mixed material in a preheater. The heat conducting oil heating unit is only used when the catalytic wet oxidation is started, and is stopped when the oxidation reaction is normally carried out. The preheater, the heat exchanger and the condenser are all double-pipe heat exchangers. An interlocking shutdown system is arranged between the high-pressure plunger pump and the air compressor, and when the high-pressure plunger pump does not work, the power supply of the air compressor is automatically cut off.
Preferably, the tail gas absorption unit comprises a plurality of spraying absorption towers which are sequentially connected, and an inner cavity of each spraying absorption tower is provided with a stainless steel pall ring, a thermometer, a flowmeter and a tail gas online detector. And introducing the gas to be treated into a spray absorption tower of the tail gas absorption unit, and finally emptying the gas after reaching the standard.
Preferably, the double-salt precipitation unit comprises a reaction tank, a filter press and a filtrate storage tank which are connected in sequence, the reaction tank is connected with the filter press through a third backflow pipeline, and a third backflow pump is arranged on the third backflow pipeline. The reaction tank comprises a pH meter, a stirring device and a medicament adding port, and a liquid medicament is pumped in by adopting a mechanical diaphragm metering pump; the pressure filter comprises a pressure gauge and a flowmeter, and the filtrate storage tank is provided with a liquid level meter and a sampling port. And pumping effluent of the catalytic wet oxidation unit into a reaction tank of the double-salt precipitation unit through a water pump, and sequentially adding phosphoric acid and magnesium salt to perform double-salt precipitation reaction, wherein the phosphoric acid is metered and pumped by using a mechanical diaphragm. After the reaction is finished, the solution is pumped into a filter press by a sand pump, and the magnesium ammonium potassium phosphate ((NH4MgPO4 & 6H2O) 4. KMgPO4 & 6H2O) in the solution is separated.
Preferably, the drying unit comprises a conveying device and a dryer which are connected in sequence, the drying unit is connected with the catalytic wet oxidation unit through a fourth backflow pipeline, and a fourth backflow pump is arranged on the fourth backflow pipeline. The dryer comprises a thermometer and a moisture online detector, and the filter cake enters the dryer through a conveying device to be dried to obtain the magnesium potassium ammonium phosphate product. And (4) overflowing the filtrate into a filtrate storage tank, and finally discharging the filtrate after reaching the standard.
The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A landfill leachate's resourceful treatment system, its characterized in that includes:
the complexing extraction unit is used for extracting humic acid in the landfill leachate;
the back extraction unit is connected to the complexing extraction unit and is used for converting the humic acid into humate;
the evaporation concentration unit is connected to the complexing extraction unit and is used for concentrating and recovering humate solution;
the catalytic wet oxidation unit is used for oxidizing the residual organic matters obtained by complexing and extracting in the landfill leachate;
the heat conduction oil heating unit is connected to the catalytic wet oxidation unit and used for heating heat conduction oil to preheat inlet water of the catalytic wet oxidation unit;
the tail gas absorption unit is connected to the catalytic wet oxidation unit and is used for washing and adsorbing small molecular carboxylic acid organic matters in the tail gas;
the double-salt precipitation unit is used for carrying out a composite reaction on phosphate, ammonia nitrogen and potassium in the landfill leachate to generate magnesium ammonium potassium phosphate precipitate;
and the drying unit is connected to the double-salt precipitation unit and is used for drying the magnesium ammonium potassium phosphate precipitate.
2. The landfill leachate recycling treatment system according to claim 1, wherein: the complex extraction unit comprises a garbage leachate storage tank, an extraction tank and a first standing separation tank which are sequentially connected.
3. The landfill leachate recycling treatment system according to claim 1, wherein: the back extraction unit comprises a back extraction tank and a second standing separation tank which are sequentially connected, the second standing separation tank is connected with the back extraction tank through a first backflow pipeline, and a first backflow pump is arranged on the first backflow pipeline.
4. The landfill leachate recycling treatment system according to claim 1, wherein: the evaporation concentration unit comprises an evaporation concentration tank, a water ring vacuum pump, a first condenser, a humate solution storage tank and a distilled water storage tank, and the front end of the water ring vacuum pump pipeline is provided with a non-condensable gas absorption device.
5. The resource treatment system for landfill leachate according to claim 1, wherein: the catalytic wet oxidation unit comprises a wastewater storage tank, a high-pressure water pump, an air compressor, a gas storage tank, a gas-liquid mixer, a preheater, a heat exchanger, a reaction tower, a second condenser and a gas-liquid separator which are sequentially connected, wherein a first interlocking shutdown system is arranged between the high-pressure water pump and the air compressor, a second-stage rupture disk device is arranged at the top of the reaction tower, sponge titanium is arranged in the upper cavity and the lower cavity of the reaction tower, and a supported catalyst is arranged in the middle cavity of the reaction tower;
the load type catalyst comprises a precious metal active component, a rare earth metal active component and a transition metal active component, wherein the precious metal active component is arranged above the rare earth metal active component, the rare earth metal active component is arranged above the transition metal active component, a temperature alarm is arranged on the reaction tower, the temperature alarm is connected with a second interlock stopping system, a liquid level alarm is arranged on the top of the reaction tower, and the liquid level alarm is connected with a third interlock stopping system.
6. The landfill leachate recycling treatment system according to claim 1, wherein: the heat conducting oil heating unit comprises a heat conducting oil storage tank, an electric heater and an expansion tank which are sequentially connected, the expansion tank is connected with the catalytic wet oxidation unit through a second return pipeline, and a second return pump is arranged on the second return pipeline.
7. The landfill leachate recycling treatment system according to claim 1, wherein: the tail gas absorption unit comprises a plurality of spraying absorption towers which are sequentially connected, and a stainless steel pall ring is arranged in an inner cavity of each spraying absorption tower.
8. The resource treatment system for landfill leachate according to claim 1, wherein: the double-salt precipitation unit comprises a reaction tank, a filter press and a filtrate storage tank which are connected in sequence, the reaction tank is connected with the filter press through a third backflow pipeline, and a third backflow pump is arranged on the third backflow pipeline.
9. The resource treatment system for landfill leachate according to claim 1, wherein: the drying unit comprises a conveying device and a dryer which are connected in sequence, the drying unit is connected with the catalytic wet oxidation unit through a fourth backflow pipeline, and a fourth backflow pump is arranged on the fourth backflow pipeline.
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Effective date of registration: 20230111 Address after: No.8 nianpeng Road, Pingdi street, Longgang District, Shenzhen, Guangdong 518100 Patentee after: SHENZHEN CITY LONGGANG DISTRICT DONGJIANG INDUSTRIAL WASTE DISPOSAL Co.,Ltd. Address before: 518000 1 / F, 3 / F, 8 / F, north, 9-12 / F, Dongjiang environmental protection building, No.9, Langshan Road, North Zone, high tech Zone, Nanshan District, Shenzhen, Guangdong Patentee before: DONGJIANG ENVIRONMENTAL Co.,Ltd. |
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