CN113735387B - Landfill leachate processing system of configuration optimization - Google Patents
Landfill leachate processing system of configuration optimization Download PDFInfo
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- CN113735387B CN113735387B CN202111140395.1A CN202111140395A CN113735387B CN 113735387 B CN113735387 B CN 113735387B CN 202111140395 A CN202111140395 A CN 202111140395A CN 113735387 B CN113735387 B CN 113735387B
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- 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
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- 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
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
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- 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
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Abstract
A landfill leachate treatment system with an optimized structure comprises a raw water tank and a denitrification filter tank which are sequentially arranged, wherein a floating ball is arranged in the raw water tank, a V-shaped pipeline is arranged on the floating ball, the V-shaped angle is an acute angle or an obtuse angle or a right angle, one end of the V-shaped pipeline is positioned at the bottom of the floating ball, the other end of the V-shaped pipeline is connected with a flexible water pipe, and the flexible water pipe is connected to an inlet of the water pipeline; an air pumping hole is formed in the top of the original water tank and connected with an air pumping pipeline, the air pumping pipeline is connected to an air pump, the outlet of the air pump is input into a high-pressure air tank, an automatic control valve is connected to the outlet of the high-pressure air tank, and an air pipeline behind the automatic control valve and an air blower are connected in parallel to an aeration pipeline of the denitrification filter tank; the packing layer in the denitrification filter is positioned on a sieve plate, the sieve plate is arched, and the packing layer is distributed in an arched shape on the upper section and the lower section of the filter. The system can achieve better environmental protection effect and save more energy.
Description
Technical Field
The invention relates to environment-friendly sewage treatment equipment, in particular to a treatment system for landfill leachate, and belongs to the technical field of environmental protection.
Background
The garbage disposal is a difficult point of the environment protection work in cities and towns, the traditional garbage disposal mode is landfill, along with the increasing of the garbage amount and the limitation of the landfill production place, and more important is to realize the damage of the garbage landfill to the soil, the current method gradually turns to the incineration of solid garbage to generate power, garbage leachate is also formed in the garbage collection, storage and transportation besides the solid garbage, research and analysis show that the garbage leachate is generally high ammonia nitrogen wastewater with higher ammonia nitrogen content than municipal sewage, and also contains a large amount of heavy metal ions, so the garbage leachate can cause heavier environmental damage if directly permeating into the ground, and is discharged after reaching the standard after being treated according to the requirement of environment protection. Aiming at the treatment of the landfill leachate, mainly high ammonia nitrogen removal and heavy metal ion treatment, for the landfill leachate in the middle and early stages, at present, a set of integrated equipment is provided, the equipment can be designed and manufactured into equipment with different treatment capacities according to different garbage scale application occasions such as a garbage transfer station, a garbage landfill site and the like, a plurality of mature application cases exist, the existing common denitrification treatment processes of the equipment are a nitrification reaction filter tank and a denitrification reaction filter tank, and some denitrification reaction tanks are arranged in front of the nitrification reaction tank (the advantage is that a carbon source in wastewater can be fully utilized), high ammonia nitrogen is removed through biological treatment, and then filtered MBR membrane treatment, nanofiltration, ultrafiltration and reverse osmosis are matched, then middle fine particles and metal ions are removed through filtration and reverse osmosis, and the integrated equipment is found to have the following points to be improved in the use and operation of the equipment: firstly, in practical use, the landfill leachate is input into a first reaction tank from an original water tank through a pump, according to the process requirements, the landfill leachate in the original water tank is filtered and basically does not contain suspended matters and sand grains, the filtered landfill leachate enters the original water tank in the primary treatment of the landfill leachate and then is pumped into the first reaction tank, a water outlet communicated with the pump on the original water tank is generally close to the bottom of the original water tank, although a large amount of fixed particles and suspended matters are filtered in the primary treatment of the landfill leachate, because the filter screen cannot be too fine, smaller particles can enter the original water tank, because a water inlet of the pump is arranged below, the particles can be pumped into subsequent processes and separated out in the subsequent processes, the treatment burden of equipment and the sludge amount are increased, particularly, the subsequent treatment energy consumption related to the filtration can be increased, manual intervention is often required, and the economic and efficient operation of the equipment is not facilitated; secondly, the landfill leachate in the raw water tank can emit large foul smell (particularly, the landfill leachate can obviously feel when a laboratory is used for process research, and ventilation facilities in a room are often required to be opened), so that people passing by the landfill leachate can feel uncomfortable, the volatile foul smell is harmful gas and can pollute the air, the existing landfill leachate treatment basically focuses on liquid and fixed treatment, the volatilization of the harmful gas is fresh, the experience of the personnel is considered by some equipment, an exhaust system is added, and the harmful gas is essentially dispersed into the atmosphere; thirdly, in the existing biological filter operated by the denitrification process, the mode of lower water inlet and upper water outlet is generally adopted, the inlet water is positioned on the upper tank body of the filler from the bottom of the tank, the flow direction of the water flow is the same as that of the nitrogen generated in the denitrification process, the nitrogen is not easy to generate aggregation, and the frequent nitrogen driving in the denitrification process is avoided, in the existing denitrification biological filter, a water distribution pipe and an aeration pipe for backwashing are arranged at the bottom of the tank, the filler is arranged on the whole cross section in the tank body, the filler is most commonly provided with quartz sand, ceramic particles and the like, microorganisms are attached to the surface of the filler to form a biological membrane, the biological membrane is subjected to denitrification reaction with a contacted water body, and simultaneously the filler intercepts and filters suspended matters in the water, one common problem in the existing denitrification filter operation is that the biological membrane on the upper filler is insufficient in the reaction and mainly depends on the biological membrane on the lower filler, because sewage flows from bottom to top, microorganisms on the filler at the lower part can participate in biochemical reaction firstly, and are attached to the surface of the filler after death, and suspended matters filtered by the filler are added, so that the gap of the filler at the lower part is gradually reduced in denitrification treatment, the head loss is large, the normal running of the denitrification reaction is influenced after the suspended matters are accumulated to a certain degree, the conventional treatment mode is backwashing, the suspended matters mainly concentrated on the filler at the lower layer and dead biological membranes are washed away by backwashing, for example, in some sewage treatment occasions, the machine is stopped for carrying out one-time backwashing after running for 2 to 3 days, high-pressure air with certain pressure and high-pressure water are introduced for the backwashing to serve as washing power, the energy consumption is large, and the generated backwashing wastewater has high dissolved oxygen because the high-pressure air is adopted, and the water body after the backwashing has high dissolved oxygen, is not beneficial to the growth of denitrifying flora and needs a certain time to reach the better operating condition of the denitrifying process.
Disclosure of Invention
The invention aims to overcome the problems in the conventional garbage leachate treatment equipment system and provides a garbage leachate treatment system with an optimized structure.
In order to realize the purpose of the invention, the following technical scheme is adopted: a garbage leachate treatment system with an optimized structure comprises a raw water tank, a denitrification filter tank, a nitrification tank and an MBR membrane tank which are sequentially arranged, wherein a nanofiltration, ultrafiltration and reverse osmosis treatment system is arranged behind the MBR membrane tank;
an air pumping hole is formed in the top in the original water tank and connected with an air pumping pipeline, the air pumping pipeline is connected to an air pump, the outlet of the air pump is input to a high-pressure air tank, an automatic control valve is connected to the outlet of the high-pressure air tank, and an air pipeline behind the automatic control valve and a blower are connected in parallel to an aeration pipeline of the denitrification filter;
the filler layer in the denitrification filter is positioned on a sieve plate, the sieve plate is arched, and the filler layer is distributed in an arched shape on the upper and lower sections of the filter.
Further, the method comprises the following steps of; the arch is in the front-back direction of the filter chamber.
Further, the method comprises the following steps of; the top of the raw water tank is fixedly provided with an inclined plate surface or the top surface of the raw water tank is the inclined plate surface, one end of the inclined plate surface is high, the other end of the inclined plate surface is low, and the air exhaust port is located at the high end of the inclined plate surface.
Further, the method comprises the following steps of; the side surface of the floating ball is fixedly connected with an ear part, the ear part is provided with a guide sleeve in the vertical direction, the raw water tank is fixedly connected with a guide rod in the vertical direction, the guide rod is arranged in the guide sleeve in a penetrating way, and a gap is reserved between the guide rod and the guide sleeve.
Further, the method comprises the following steps of; the V-shaped angle is a right angle.
Further, the method comprises the following steps of; and a sludge discharge hole is formed in the side surface of the bottom of the raw water tank.
Further, the method comprises the following steps of; the inlet of the V-shaped pipeline is connected with a suction pipe.
The invention has the positive and beneficial technical effects that: the treatment system adopts the water inlet at the floating ball, thereby avoiding treatment load caused by the fact that most solid particles enter the subsequent reaction procedure; the gas with the foul smell is pumped into the high-pressure gas tank by the air pump, so that the harmful gas is prevented from entering the atmosphere to cause pollution, meanwhile, because the oxygen content of the gas is lower than that of the air and some gas in the high-pressure gas tank can be oxidized to further reduce the oxygen content, the whole oxygen content in the high-pressure storage tank is lower, the gas is used as the last aeration gas in the back washing process of the denitrification filter tank, so that the dissolved oxygen in the denitrification filter tank can be reduced, because the gas has certain carbon and sulfur, the gas is favorable for denitrifying bacteria, the rapid recovery of the denitrifying bacteria after the back washing is favorable, the time for recovering to the optimal process can be shortened, the harmful gas originally volatilized into the air can be beneficially utilized, when the denitrification filter tank is not well stirred, the gas in high pressure can be adopted for aeration stirring, and because the oxygen content is low, the negative influence on the denitrifying bacteria in the aeration stirring process is small; the denitrification filtering pond packing layer has adopted the arch to distribute, and the total height of packing layer top surface to arch both ends bottom is unanimous with original packing layer thickness, makes traditional packing layer form arch bridge structure, through preliminary test analysis, the positive profitable technological effect who has produced: firstly, the process operation result is not poor compared with the traditional denitrification biological filter, which is probably because the maximum coverage height of the filler layer is not changed; secondly, owing to adopted domes, sewage flows the upper portion of packing more easily, make full use of the biomembrane on the upper portion filler and participate in the reaction, make the biomembrane utilize more fully, head loss is little in the reaction, and more obvious effect is: because the biomembrane on the filler at the upper part fully participates in the denitrification reaction, and the height of the filler layer at the arched part is reduced, the backwashing water pressure and the air pressure used in the backwashing are obviously reduced compared with the original one, and the energy-saving effect is obvious; thirdly, the arch structure can increase the sludge amount at the lower part of the packing layer, which is beneficial to the increase of the number of denitrifying bacteria, thus leading the denitrifying effect to be better. The system is feasible and effective through tests, and can achieve better environmental protection effect and save more energy by optimizing on the basis of the existing process equipment.
Drawings
FIG. 1 is a partial schematic view of the present invention.
Fig. 2 is a partially enlarged view of fig. 1.
FIG. 3 is a process flow diagram of the present invention for treating landfill leachate.
Detailed Description
In order to more fully explain the implementation of the present invention, the implementation examples of the present invention are provided, which are merely illustrative of the present invention and do not limit the scope of the present invention.
In the drawings, each symbol is: 1: a raw water tank; 2: the top surface of the raw water tank; 3: a floating ball; 4: a V-shaped pipeline; 5: a flexible water pipe; 6: a water delivery pipeline; 7: a water inlet pipe; 8: a delivery pump; 9: a guide bar; 10: a guide sleeve; 11: a sludge discharge hole; 12: an air extraction pipeline; 13: an air pump; 14: a high pressure gas tank; 15: a self-control valve; 16: an aeration pipeline of the denitrification filter; 17: a denitrification filter; 18: a packing layer; 19: a sieve plate; 20: backwashing the waterway; 21: a blower; 22: an aeration pipeline of the nitrification tank; 23: a nitrification tank; 24: MBR membrane tanks; 25: a return pipeline from the nitrification tank to the denitrification filter tank; 26: a sludge return line; 27: a straw.
As shown in the attached drawing, the garbage leachate treatment system with an optimized structure comprises a raw water tank 1, a denitrification filter tank 17, a nitrification tank 23 and an MBR membrane tank 24 which are sequentially arranged, wherein a nanofiltration, ultrafiltration and reverse osmosis treatment system is arranged behind the MBR membrane tank, the nanofiltration, ultrafiltration and reverse osmosis treatment system is the prior art, and is not shown in the drawing, an aeration device and a water distribution pipe are arranged at the bottom of the nitrification tank, a blower is connected to an aeration pipeline of the nitrification tank, the water distribution pipe and a reverse-flushing aeration device are arranged at the bottom of the denitrification filter tank, 16 is an aeration pipeline of the denitrification filter tank, the blower is connected to the aeration pipeline, the water distribution pipe of the denitrification filter tank is connected with a water inlet pipe, a reverse-flushing water channel 20 is further connected to a water inlet pipe of the denitrification filter tank, the aeration device is connected with the blower 21, a packing layer 18 is arranged in the denitrification filter tank 17, a return pipeline is arranged between the nitrification tank and the denitrification filter tank, a sludge return pipeline is arranged between the MBR membrane tank and the denitrification filter tank, 25 is a sludge return pipeline from the nitrification tank to the denitrification filter tank, 26 is a sludge return pipeline, the raw water tank 1 is connected with a water delivery pump 8, the water inlet pipe of the denitrification filter tank, and a water inlet pipe of the existing denitrification filter tank are also arranged above the existing technology.
A floating ball 3 is arranged in the raw water tank 1, a V-shaped pipeline 4 is arranged on the floating ball, the V-shaped angle is an acute angle, an obtuse angle or a right angle, and in the embodiment, the V-shaped angle is a right angle. The side surface of the floating ball is fixedly connected with an ear part, the ear part is provided with a guide sleeve 10 in the vertical direction, a guide rod 9 in the vertical direction is fixedly connected in the raw water tank, the guide rod is arranged in the guide sleeve in a penetrating manner, a gap is formed between the guide rod and the guide sleeve, the gap ensures that the floating ball can float freely along with the liquid level, and the guide sleeve restrains the floating ball from overturning. One end of the V-shaped pipeline is positioned at the bottom of the floating ball, the inlet of the V-shaped pipeline is connected with a suction pipe 27, the inlet is the bottom, the other end of the V-shaped pipeline is connected with a flexible water pipe 5, and the flexible water pipe is connected to the inlet of a water conveying pipeline 6; a delivery pump 8 is arranged on the water delivery pipeline, the outlet of the delivery pump is connected with the water inlet pipe 7 of the denitrification filter, and the side surface of the bottom of the original water tank is provided with a sludge discharge hole 11.
The top has the extraction opening in former water tank, and is fixed to be provided with swash plate face or former water tank top surface at former water tank top and be the swash plate face, and in this embodiment, former water tank top surface 2 is the swash plate face, and the one end of swash plate face is high, one end is low, and the gas in the former water tank can be to high-end gathering like this, and the extraction opening is located the high-end department of swash plate face. The air pumping port is connected with an air pumping pipeline 12, the air pumping pipeline is connected to an air pump 13, the outlet of the air pump is input into a high-pressure air tank 14, an automatic control valve 15 is connected to the outlet of the high-pressure air tank, and an air pipeline behind the automatic control valve and an air blower are connected in parallel to be connected into an aeration pipeline of the denitrification filter. As an alternative to the high pressure tank, a lower pressure tank may be used, in which case two inlet branch pipes are provided at the inlet of the blower, both branch pipes are connected to valves, one of the branch pipes is connected to the outlet pipe of the tank, so that the low oxygen content gas can be blown into the denitrification filter tank by the blower at the final stage of backwashing under the condition of lower pressure of the tank. The gas in the gas tank has two purposes, namely, the gas is used at the tail end of the backwashing process; secondly, when the stirring is not good, the stirring is realized by aeration.
The packing layer 18 in the denitrification filter is positioned on a sieve plate 19, the sieve plate is arched, the packing layer is distributed in an arch shape on the upper and lower sections of the filter, and the arch shape is in the front-back direction of the filter.
In the application, only the optimized structural change parts in the aspects of collecting the foul gas by the raw water tank, the denitrification filter tank and the high-pressure gas tank related in the existing equipment system are introduced in detail, other parts can refer to the existing equipment, the configuration of the existing equipment such as an oxygen detector, a temperature detector, a back flush wastewater tank and other equipment, pipeline connection, stirring equipment and the like in the nitrification tank can refer to the existing equipment, the process arrangement of the treatment system is the same as that of the existing system, and the process equipment arrangement is the same as that of the existing system as shown in fig. 3.
After the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended that all simple modifications, equivalent changes and modifications made to the above embodiments based on the technical spirit of the present invention shall fall within the technical scope of the present invention, and the present invention shall not be limited to the embodiments illustrated in the description.
Claims (3)
1. The utility model provides a configuration optimization's landfill leachate processing system, including the former water tank that arranges in proper order, the denitrification filtering pond, nitrify the pond, the MBR membrane cisterna, install behind the MBR membrane cisterna and receive and strain, ultrafiltration and reverse osmosis treatment system, nitrify the bottom of the pool and have aerating device, the water-distribution pipe and back flush aerating device are installed to denitrification filtering pond bottom, the water-distribution pipe in denitrification filtering pond links to each other with the inlet tube in denitrification filtering pond, still be connected with the back flush water route on the inlet tube in denitrification filtering pond, nitrify the aerating device of bottom of the pool, the back flush aerating device of denitrification filtering pond bottom all connects the air-blower, be provided with the packing layer in the denitrification filtering pond, nitrify the pond and have the backward flow pipeline between filtering pond to the denitrification filtering pond, MBR membrane cisterna has the mud backward flow pipeline between filtering pond to the denitrification filtering pond, its characterized in that: the raw water tank is connected with the denitrification filter tank through a water conveying pipeline, a conveying pump is installed on the water conveying pipeline, an outlet of the conveying pump is connected with a water inlet pipe of the denitrification filter tank, a floating ball is arranged in the raw water tank, a V-shaped pipeline is arranged on the floating ball, the V-shaped angle is an acute angle, an obtuse angle or a right angle, one end of the V-shaped pipeline is located at the bottom of the floating ball, a suction pipe is connected to the bottom of the V-shaped pipeline, the other end of the V-shaped pipeline is connected with a flexible water pipe, and the flexible water pipe is connected to an inlet of the water conveying pipeline; the side surface of the floating ball is fixedly connected with an ear part, the ear part is provided with a guide sleeve in the vertical direction, a guide rod in the vertical direction is fixedly connected in the raw water tank, the guide rod is arranged in the guide sleeve in a penetrating way, and a gap is formed between the guide rod and the guide sleeve;
an air pumping hole is formed in the top in the original water tank and connected with an air pumping pipeline, the air pumping pipeline is connected to an air pump, the outlet of the air pump is input to a high-pressure air tank, an automatic control valve is connected to the outlet of the high-pressure air tank, and an air pipeline behind the automatic control valve and a blower are connected in parallel to an aeration pipeline of the denitrification filter; the top of the raw water tank is fixedly provided with an inclined plate surface or the top surface of the raw water tank is the inclined plate surface, one end of the inclined plate surface is high, the other end of the inclined plate surface is low, and the air exhaust port is positioned at the high end of the inclined plate surface;
the filler layer in the denitrification filter is positioned on a sieve plate, the sieve plate is arched, and the filler layer is distributed in an arched shape on the upper and lower sections of the filter; the arch is in the front-back direction of the filter chamber.
2. The structurally optimized landfill leachate treatment system of claim 1, wherein: the V-shaped angle is a right angle.
3. The structurally optimized landfill leachate treatment system of claim 1, wherein: and a sludge discharge hole is formed in the side surface of the bottom of the original water tank.
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| CN202111140395.1A CN113735387B (en) | 2021-09-28 | 2021-09-28 | Landfill leachate processing system of configuration optimization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108947102B (en) * | 2018-06-22 | 2021-02-23 | 南京大学 | Device for deep denitrification and toxicity reduction of sewage and operation method thereof |
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2021
- 2021-09-28 CN CN202111140395.1A patent/CN113735387B/en active Active
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|---|---|---|---|---|
| CN202415241U (en) * | 2011-12-09 | 2012-09-05 | 上海奥迪菲环境工程有限公司 | W-shaped air-water distribution system for sewage treatment |
| CN103453675A (en) * | 2013-09-27 | 2013-12-18 | 山东力诺瑞特新能源有限公司 | Floating type water outlet device |
| CN204107978U (en) * | 2014-10-21 | 2015-01-21 | 华新水泥股份有限公司 | A kind of refuse disposal system |
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| CN113735387A (en) | 2021-12-03 |
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Denomination of invention: A structurally optimized landfill leachate treatment system Effective date of registration: 20230720 Granted publication date: 20221125 Pledgee: Bank of China Limited Anyang Branch Pledgor: HENAN LICHENG ENVIRONMENTAL TECHNOLOGY Co.,Ltd. Registration number: Y2023980049024 |