CN112707599A - Composite pretreatment method for distributed rural domestic sewage - Google Patents
Composite pretreatment method for distributed rural domestic sewage Download PDFInfo
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- CN112707599A CN112707599A CN202011618411.9A CN202011618411A CN112707599A CN 112707599 A CN112707599 A CN 112707599A CN 202011618411 A CN202011618411 A CN 202011618411A CN 112707599 A CN112707599 A CN 112707599A
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- 239000010865 sewage Substances 0.000 title claims abstract description 88
- 239000002131 composite material Substances 0.000 title claims abstract description 24
- 238000002203 pretreatment Methods 0.000 title claims abstract description 12
- 239000010802 sludge Substances 0.000 claims abstract description 35
- 238000011282 treatment Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000000945 filler Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 4
- 231100000719 pollutant Toxicity 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000005192 partition Methods 0.000 claims description 15
- 238000007689 inspection Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000011221 initial treatment Methods 0.000 claims description 3
- 239000011178 precast concrete Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010866 blackwater Substances 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 2
- 239000010797 grey water Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 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
- 210000003608 fece Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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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
- C02F1/001—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
- C02F3/00—Biological 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
Abstract
The invention relates to a composite pretreatment method of distributed rural domestic sewage, which can effectively solve the composite treatment of rural domestic sewage and prevent the environmental pollution, and the method is characterized in that the domestic sewage is subjected to pretreatment reaction by primarily removing large-particle pollutants in the domestic sewage through a grating, the pretreatment reaction is realized by leading the domestic sewage to pass through a first downflow chamber, an upflow chamber and a second downflow chamber, the first downflow chamber, the upflow chamber and the second downflow chamber form a domestic sewage pretreatment system, BOD fillers are filled in the first downflow chamber and the second downflow chamber and react for 6 to 8 hours to improve the sludge concentration, sludge is pumped out by a sludge suction pump and transported outwards, and the sewage is pumped into biochemical or physicochemical equipment by a sewage lifting pump to carry out biochemical or physicochemical treatment. Is a great innovation in rural domestic sewage treatment, and has remarkable economic and social benefits.
Description
Technical Field
The invention relates to sewage treatment, in particular to a composite pretreatment method of distributed rural domestic sewage.
Background
Along with the improvement of life and the increase of water consumption of people, rural domestic sewage is more and more, and the sewage contains a lot of harmful substances, if the sewage is directly discharged, the pollution to the environment can be caused, the grey water and the black water of the rural domestic sewage are often mixed and discharged at present, and after a dry-land water-changing toilet is implemented in the northern area, the situation that the domestic sewage contains a small amount of black water or livestock and poultry excrement and the like due to the damage or the abandonment of a nearby septic tank still exists sometimes. Therefore, how to effectively solve the treatment of rural domestic sewage is a technical problem to be solved seriously.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention aims to provide a composite pretreatment method of the distributed rural domestic sewage, which can effectively solve the problem of composite treatment of the rural domestic sewage and prevent environmental pollution.
The technical scheme of the invention is that a composite pretreatment method of distributed rural domestic sewage comprises the following steps:
(1) and building composite treatment equipment:
the composite treatment equipment comprises an artificial grating, a first downflow chamber, an upflow chamber, a second downflow chamber, a sewage lift pump and biochemical or physicochemical equipment, wherein the artificial grating is provided with a domestic sewage inlet, a domestic sewage outlet on the artificial grating is communicated with a water inlet of the first downflow chamber, a water outlet of the first downflow chamber is communicated with a water inlet of the upflow chamber, a water outlet of the upflow chamber is communicated with a water inlet of the second downflow chamber, a water outlet of the second downflow chamber is communicated with a water inlet of the biochemical or physicochemical equipment, the biochemical or physicochemical equipment is provided with a water outlet, the first downflow chamber is provided with a sludge suction port, and is communicated with a first sludge suction pump, the upstream chamber is provided with a sludge suction port and is communicated with a second sludge suction pump, the second downstream chamber is provided with a sludge suction port, and is communicated with a third sludge suction pump, and a sewage lifting pump is arranged on a pipeline between the second downflow chamber and the biochemical or physicochemical equipment;
(2) primary treatment of domestic sewage:
domestic sewage enters the artificial grating from a water inlet of the artificial grating, the gap between the gratings is 5-10mm, large-particle pollutants in the domestic sewage are preliminarily removed, and then the domestic sewage enters the first downflow chamber through a water outlet of the artificial grating;
(3) and (3) pretreatment reaction:
the pretreatment reaction is realized by domestic sewage passing through a first downflow chamber, an upflow chamber and a second downflow chamber, the first downflow chamber, the upflow chamber and the second downflow chamber form a domestic sewage pretreatment system (pool), the upper part of each chamber is provided with an inspection port, the first downflow chamber and the second downflow chamber are filled with BOD filler with the grain diameter of 150 plus materials of 180mm, and the volume load is 1-1.2kg BOD/m3The reaction time of the domestic sewage pretreatment system is 6-8h, the sludge concentration is improved, the sludge is pumped out by a sludge suction pump and transported outwards, 70-80% of suspended matters (SS) are removed, and the anaerobic COD and BOD removal rate is improved by 50-60%;
(4) biochemical or physicochemical reaction:
the domestic sewage after the pretreatment reaction is pumped into biochemical or physicochemical equipment by a sewage lifting pump for biochemical or physicochemical treatment, thereby realizing the composite pretreatment of the distributed rural domestic sewage and lightening the load of the subsequent biochemical treatment.
The method has the advantages of simple equipment, easy installation and use, simple operation method, flexibility, rapidness and low cost, is very suitable for small-scale distributed sewage composite pretreatment in rural areas, is particularly suitable for rural local non-professional technicians and the requirement on high unattended requirement, is a great innovation for rural domestic sewage treatment, and has remarkable economic and social benefits.
Drawings
FIG. 1 is a block diagram of the process of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In the specific implementation of the invention, the composite pretreatment method of the distributed rural domestic sewage comprises the following steps:
(1) and building composite treatment equipment:
the composite treatment equipment comprises an artificial grating, a first downflow chamber, an upflow chamber, a second downflow chamber, a sewage lifting pump and biochemical or physicochemical equipment, wherein a domestic sewage inlet is arranged on the artificial grating 1, a domestic sewage outlet on the artificial grating 1 is communicated with a water inlet of the first downflow chamber 2, a water outlet of the first downflow chamber 2 is communicated with a water inlet of the upflow chamber 3, a water outlet of the upflow chamber 3 is communicated with a water inlet of the second downflow chamber 4, a water outlet of the second downflow chamber 4 is communicated with a water inlet of the biochemical or physicochemical equipment 6, a water outlet is arranged on the biochemical or physicochemical equipment 6, a sludge suction port is arranged on the first downflow chamber 2 and is communicated with a first sludge suction pump 7-1, a sludge suction port is arranged on the upflow chamber 3 and is communicated with a second sludge suction pump 7-2, a sludge suction port is arranged on the second downflow chamber 4, and is communicated with a third sludge suction pump 7-3, and a sewage lifting pump 5 is arranged on a pipeline between the second downflow chamber 4 and the biochemical or physicochemical equipment 6;
(2) primary treatment of domestic sewage:
domestic sewage enters the artificial grating from a water inlet of the artificial grating 1, the gap between the gratings is 5-10mm, large-particle pollutants in the domestic sewage are preliminarily removed, and then the domestic sewage enters the first downflow chamber 2 through a water outlet of the artificial grating;
(3) and (3) pretreatment reaction:
the pretreatment reaction is realized by domestic sewage through a first downflow chamber 2, an upflow chamber 3 and a second downflow chamber 4, the first downflow chamber 2, the upflow chamber 3 and the second downflow chamber 4 form a domestic sewage pretreatment system (pool), the upper part of each chamber is provided with an inspection hole, the first downflow chamber 2 and the second downflow chamber 4 are filled with BOD (biochemical oxygen demand) filling materials with the particle size of 150-The volume load of the material is 1-1.2kg BOD/m3The reaction time of the domestic sewage pretreatment system is 6-8h, the sludge concentration is improved, the sludge is pumped out by a sludge suction pump and transported outwards, 70-80% of suspended matters (SS) are removed, and the anaerobic COD and BOD removal rate is improved by 50-60%;
(4) biochemical or physicochemical reaction:
the domestic sewage after the pretreatment reaction is pumped into a biochemical or physicochemical device 6 by a sewage lifting pump 5 for biochemical or physicochemical treatment, thereby realizing the composite pretreatment of the decentralized rural domestic sewage and reducing the load of the subsequent biochemical treatment.
In order to ensure the use effect and convenient use, the top of the upstream chamber 3 is provided with a triangular weir, and domestic sewage flows into the second downstream chamber 4 through the triangular weir;
the water outlets of the first downflow chamber 2 and the upflow chamber 3 are respectively provided with a submersible sewage pump, and the effluent is lifted to a lower-level processing unit;
the first downflow chamber 2, the upflow chamber 3 and the second downflow chamber 4 are combined together to form a pretreatment reaction structure (system or pool), the length-width ratio of each chamber is 1-1.5: 1, 4-5 flow partition plates are arranged in each chamber to form a flow partition chamber, the front first flow partition chamber is larger than the width of the rear flow partition chamber, the length and the width of the first flow partition chamber and the subsequent unit flow partition chambers are 1-1.2: 1, the first downflow chamber 2, the upflow chamber 3 and the second downflow chamber 4 are all hollow squares made of steel concrete, precast concrete and glass fiber reinforced plastic, the top of each flow partition chamber is provided with an inspection opening, the size of each flow partition chamber is 800mm × 800mm, the inspection opening is covered with a cover plate, and the size of the cover plate is 880mm × 880 mm;
the triangular weir at the top of the up-flow chamber 3 is a 90-degree right-angle triangular weir, and the length of the triangular weir is the same as the width of the up-flow chamber 3;
it can be seen from the above that, domestic sewage containing grey water and a small amount of black water automatically flows into the artificial grille 1 through a pipe network or an underdrain, after larger inorganic particles in the water are removed through the artificial grille, the domestic sewage flows into the first downflow chamber 2, the upflow chamber 3 and the second downflow chamber 4 in sequence, when the upflow chamber 3 flows into the second downflow chamber 4, effluent uniformly flows out through a top triangular weir, the upflow chamber and the bottom triangular weir are both provided with anaerobic special fillers to increase the amount of sludge, the last compartment is often provided with a submersible sewage pump (1 for 1), and the effluent is lifted to enter the secondary biochemical treatment unit. There is the inspection socket at every compartment top, and the regular inspection is patrolled and examined and is drawn clearly and draw and go on through the inspection socket, and is very convenient. The invention combines the structural form of the traditional three-grid septic tank with the ABR anaerobic plug flow process characteristic, and strengthens the pretreatment function by adding the filler form, thereby reducing the subsequent treatment load. For small-scale distributed rural domestic sewage, the whole sewage treatment period can be controlled within 7-10 days through reasonable prefabrication or field construction, so that a better and stable treatment effect can be obtained, and the economic benefit is obvious. Compared with the prior art, the invention has the following prominent substantive characteristics and beneficial technical effects:
1: the three-lattice structure form of the traditional septic tank is combined with the plug flow process form of the anaerobic baffle plate reactor in sewage treatment, and the three-lattice structure form can be used as a regulating tank for regulating water quantity and water quality in small-scale rural sewage pretreatment, simultaneously precipitate large-particle inorganic matters or suspended matters, and can also be used as anaerobic pretreatment for secondary biochemistry, wherein the three-lattice structure form comprises a hydrolysis acidification stage, and the three-lattice structure form integrates the functions of regulation, precipitation and hydrolysis acidification. The conventional process flow is simplified, and the pretreatment effect is improved.
2: by adopting an ABR-like plug flow mode, the sludge concentration is improved by adding the elastic filler in the upper and lower flow sections, the SS removal rate (70-80%) is increased, and the anaerobic COD and BOD removal efficiency (50-60%) is improved. The precipitated sludge can be periodically cleaned and discharged to a sludge pool or a dung suction truck for outward transportation.
3: the sludge yield is relatively low due to the anaerobic environment. The sewage pump generally arranged at the end of the process is mainly used for lifting sewage to the next stage of biochemical treatment. Because the treatment efficiency is improved in the pretreatment section, the treatment device can be combined with a plurality of subsequent biochemical and physical chemical process units according to the effluent discharge standard of the sewage station to form a complete sewage treatment process chain, and the subsequent biochemical treatment load is greatly reduced.
4: the prefabricated integrated form, simple structure, it is convenient to maintain. The material can adopt various forms such as reinforced concrete cast-in-place, precast concrete tank, glass fiber reinforced plastic septic tank additional installation and transformation and the like according to the requirements of anticorrosion and process, is flexible and quick, has low cost, is suitable for the requirements of no professional technical personnel in rural areas, high unattended requirements and the like, is an innovation in rural domestic sewage treatment, and has remarkable economic and social benefits.
Claims (5)
1. A composite pretreatment method of distributed rural domestic sewage is characterized by comprising the following steps:
1) and building composite treatment equipment:
the composite treatment equipment comprises an artificial grating, a first downflow chamber, an upflow chamber, a second downflow chamber, a sewage lifting pump and biochemical or physicochemical equipment, wherein a domestic sewage inlet is arranged on the artificial grating (1), a domestic sewage outlet on the artificial grating (1) is communicated with a water inlet of the first downflow chamber (2), a water outlet of the first downflow chamber (2) is communicated with a water inlet of the upflow chamber (3), a water outlet of the upflow chamber (3) is communicated with a water inlet of the second downflow chamber (4), a water outlet of the second downflow chamber (4) is communicated with a water inlet of the biochemical or physicochemical equipment (6), a water outlet is arranged on the biochemical or physicochemical equipment (6), a sludge suction port is arranged on the first downflow chamber (2) and is communicated with a first sludge suction pump (7-1), a sludge suction port is arranged on the upflow chamber (3) and is communicated with a second sludge suction pump (7-2), a sludge suction port is arranged on the second downflow chamber (4) and is communicated with a third sludge suction pump (7-3), and a sewage lifting pump (5) is arranged on a pipeline between the second downflow chamber (4) and the biochemical or physicochemical equipment (6);
2) primary treatment of domestic sewage:
domestic sewage enters the artificial grating from a water inlet of the artificial grating (1), the gap between the gratings is 5-10mm, large-particle pollutants in the domestic sewage are preliminarily removed, and then the domestic sewage enters the first downflow chamber (2) through a water outlet of the artificial grating;
3) and (3) pretreatment reaction:
the pretreatment reaction is realized by domestic sewage through a first downflow chamber (2), an upflow chamber (3) and a second downflow chamber (4), and the first downflow chamber (2), the upflow chamber (3) and the second downflow chamber (4) form a domestic sewage pretreatment system (pool)The upper part of each chamber is provided with an inspection port, the first downflow chamber (2) and the second downflow chamber (4) are filled with BOD filler with the grain diameter of 150-3The reaction time of the domestic sewage pretreatment system is 6-8h, the sludge concentration is improved, the sludge is pumped out by a sludge suction pump and transported outwards, 70-80% of suspended matters (SS) are removed, and the anaerobic COD and BOD removal rate is improved by 50-60%;
4) biochemical or physicochemical reaction:
the domestic sewage after the pretreatment reaction is pumped into biochemical or physicochemical equipment (6) by a sewage lifting pump (5) for biochemical or physicochemical treatment, thereby realizing the composite pretreatment of the decentralized rural domestic sewage and lightening the load of the subsequent biochemical treatment.
2. The decentralized composite pretreatment method for rural domestic sewage according to claim 1, wherein a triangular weir is provided on the top of the upstream chamber (3), and domestic sewage flows into the second downstream chamber (4) through the triangular weir.
3. The distributed rural domestic sewage composite pretreatment method according to claim 1, wherein submerged sewage pumps are arranged at the water outlets of the first downflow chamber (2) and the upflow chamber (3) to lift the effluent to a lower-level treatment unit.
4. The distributed rural domestic sewage composite pretreatment method according to claim 1, wherein the first downflow chamber (2), the upflow chamber (3) and the second downflow chamber (4) are combined together to form a pretreatment reaction structure, the length-width ratio of each chamber is 1-1.5: 1, 4-5 flow partition plates are arranged in each chamber to form a flow partition chamber, the front first flow partition chamber is larger than the width of the rear flow partition chamber, the length and width of the first flow partition chamber and each subsequent unit flow partition chamber are 1-1.2: 1, the first downflow chamber (2), the upflow chamber (3) and the second downflow chamber (4) are all hollow squares made of steel concrete, precast concrete and glass steel, the top of each flow partition chamber is provided with an inspection opening with the size of 800mm x 800mm, the inspection opening is covered with a cover plate, and the size of the cover plate is 880mm x 880 mm.
5. The decentralized composite pretreatment method for rural domestic sewage according to claim 2, wherein the triangular weir at the top of the upstream chamber (3) is a 90 ° right-angled triangular weir, and the length of the triangular weir is the same as the width of the upstream chamber (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011618411.9A CN112707599A (en) | 2020-12-31 | 2020-12-31 | Composite pretreatment method for distributed rural domestic sewage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011618411.9A CN112707599A (en) | 2020-12-31 | 2020-12-31 | Composite pretreatment method for distributed rural domestic sewage |
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| CN112707599A true CN112707599A (en) | 2021-04-27 |
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| CN202011618411.9A Pending CN112707599A (en) | 2020-12-31 | 2020-12-31 | Composite pretreatment method for distributed rural domestic sewage |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103979680A (en) * | 2014-06-06 | 2014-08-13 | 中国科学院城市环境研究所 | Biochemical pretreatment device with water quality and water quantity regulation function |
| CN105036486A (en) * | 2015-08-17 | 2015-11-11 | 台州学院 | Method for deeply treating antibiotic pharmaceutical wastewater based on magnetic Fenton-like resin |
| CN205151896U (en) * | 2015-10-28 | 2016-04-13 | 福州北环环保技术开发有限公司 | Novel anaerobism baffling reactor |
| CN106892535A (en) * | 2017-02-27 | 2017-06-27 | 上海交通大学 | A kind of decentralized type sewage processing equipment and method for being applicable rural area |
| WO2018129895A1 (en) * | 2017-01-16 | 2018-07-19 | 深圳市碧园环保技术有限公司 | Treatment system for rural domestic sewage |
| CN208250116U (en) * | 2018-03-29 | 2018-12-18 | 云南大学 | A kind of domestic sewage processing system suitable for characteristic small town |
| CN111559837A (en) * | 2020-07-04 | 2020-08-21 | 湖南首创投资有限责任公司 | Landfill leachate biochemical treatment system and process |
| CN212246664U (en) * | 2020-04-15 | 2020-12-29 | 河南双辰环保工程有限公司 | Anaerobic baffle plate reactor for rice puffed food wastewater |
-
2020
- 2020-12-31 CN CN202011618411.9A patent/CN112707599A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103979680A (en) * | 2014-06-06 | 2014-08-13 | 中国科学院城市环境研究所 | Biochemical pretreatment device with water quality and water quantity regulation function |
| CN105036486A (en) * | 2015-08-17 | 2015-11-11 | 台州学院 | Method for deeply treating antibiotic pharmaceutical wastewater based on magnetic Fenton-like resin |
| CN205151896U (en) * | 2015-10-28 | 2016-04-13 | 福州北环环保技术开发有限公司 | Novel anaerobism baffling reactor |
| WO2018129895A1 (en) * | 2017-01-16 | 2018-07-19 | 深圳市碧园环保技术有限公司 | Treatment system for rural domestic sewage |
| CN106892535A (en) * | 2017-02-27 | 2017-06-27 | 上海交通大学 | A kind of decentralized type sewage processing equipment and method for being applicable rural area |
| CN208250116U (en) * | 2018-03-29 | 2018-12-18 | 云南大学 | A kind of domestic sewage processing system suitable for characteristic small town |
| CN212246664U (en) * | 2020-04-15 | 2020-12-29 | 河南双辰环保工程有限公司 | Anaerobic baffle plate reactor for rice puffed food wastewater |
| CN111559837A (en) * | 2020-07-04 | 2020-08-21 | 湖南首创投资有限责任公司 | Landfill leachate biochemical treatment system and process |
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Application publication date: 20210427 |
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