CN111410270A - Process and system for treating desulfurization wastewater by membrane method - Google Patents
Process and system for treating desulfurization wastewater by membrane method Download PDFInfo
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- CN111410270A CN111410270A CN202010229489.5A CN202010229489A CN111410270A CN 111410270 A CN111410270 A CN 111410270A CN 202010229489 A CN202010229489 A CN 202010229489A CN 111410270 A CN111410270 A CN 111410270A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 68
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 59
- 230000023556 desulfurization Effects 0.000 title claims abstract description 59
- 239000012528 membrane Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001914 filtration Methods 0.000 claims abstract description 153
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 114
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 239000010802 sludge Substances 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 9
- 238000011001 backwashing Methods 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000010865 sewage Substances 0.000 claims description 9
- 238000005374 membrane filtration Methods 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 abstract description 8
- 239000008394 flocculating agent Substances 0.000 abstract description 5
- 238000010992 reflux Methods 0.000 abstract 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a process and a system for treating desulfurization wastewater by a membrane method, wherein the process comprises the following steps: a: uniformly collecting desulfurization wastewater to be desulfurized in a desulfurization system in a buffer pool; b, pumping the desulfurization wastewater in the step A to a first silicon carbide membrane filtering device through a membrane filtering circulating pump for primary filtering, refluxing a part of filtered liquid after primary filtering to the membrane filtering circulating pump, and executing the next step; the other part of the filtered liquid forms clear liquid which is filtered out to a clear liquid tank; c, pumping a part of the filtered liquid subjected to primary filtration in the step B to a second silicon carbide diaphragm filtering device through a membrane filtering circulating pump for internal circulation type fine filtration; and D, filtering out the clear liquid after fine filtration to a clear liquid tank, and making the sludge flow to a sludge tank. The invention not only does not produce precipitate, but also does not need to add flocculating agent.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a process and a system for treating desulfurization wastewater by a membrane method.
Background
At present, the national environmental protection policy is more and more strict, and the following policies have been issued and implemented: environmental protection laws of the people's republic of China, prevention and treatment laws of atmospheric pollutants of the people's republic of China, environmental air quality standards GB3095-2012, and Integrated wastewater discharge standards GB 8978-1996. Sulfur dioxide is one of the atmospheric pollutants, is one of the indexes of the strictly controlled atmospheric pollutants, and sulfur dioxide in flue gas is required to be treated by all the flue gas discharged by factories, mines, power plants, smelting and chemical industries to the air. Most of plant and mining power plants adopt limestone or lime-gypsum wet desulphurization technology to treat sulfur dioxide in smelting treatment flue gas, the technology is difficult to control the balance of sulfur dioxide in flue gas to desulphurization system water, redundant desulphurization waste water is generated in the desulphurization process of the desulphurization system, the desulphurization waste water contains a large amount of solid components, the desulphurization waste water pollutes natural water, and secondary treatment is necessary. The common treatment method of the desulfurization wastewater is desulfurization wastewater and flocculant, so that solid particles in the desulfurization wastewater are precipitated and are subjected to solid-liquid separation.
However, if the flocculant is added, the process is more complex, the number of control points is more, the addition amount of the flocculant is difficult to accurately control, excessive addition of the flocculant does not waste light, the operation cost is increased, solid-liquid separation of the desulfurization wastewater is difficult if the additive is too low, and the treated wastewater is difficult to reach the standard; the viscosity of the precipitate generated after the excessive addition of the flocculating agent is too high, which increases difficulty for the subsequent treatment of the precipitate generated by the desulfurization wastewater, the precipitate generated by the desulfurization wastewater is generally dehydrated by a vacuum belt filter or a centrifuge, and the vacuum belt filter and the centrifuge with large viscosity of the precipitate are not dried; the pipeline for conveying the precipitate generated by the existing desulfurization wastewater treatment process from the desulfurization wastewater treatment machine to the vacuum belt filter or the centrifugal machine is easy to block, and the blocking phenomenon is frequent.
Disclosure of Invention
Aiming at the problems, the invention provides a process and a system for treating desulfurization wastewater by a membrane method without generating precipitates and adding a flocculating agent.
The technical scheme adopted by the invention for solving the technical problems is as follows: a process and a system for treating desulfurization wastewater by a membrane method comprise the following steps:
a: uniformly collecting desulfurization wastewater to be desulfurized in a desulfurization system in a buffer pool;
b, pumping the desulfurization wastewater in the step A to a first silicon carbide diaphragm filtering device through a diaphragm filtering circulating pump for primary filtering,
returning part of the filtered liquid after primary filtration to a membrane filtration circulating pump, and executing the next step;
the other part of the filtered liquid forms clear liquid which is filtered out to a clear liquid tank;
c, pumping a part of the filtered liquid subjected to primary filtration in the step B to a second silicon carbide diaphragm filtering device through a membrane filtering circulating pump for internal circulation type fine filtration;
and D, filtering out the clear liquid after fine filtration to a clear liquid tank, and making the sludge flow to a sludge tank.
Preferably, the first silicon carbide membrane filter device and the second silicon carbide membrane filter device in the steps B and C are both provided with a backwashing water inlet, and the backwashing liquid is pumped to the silicon carbide membrane filter device through the backwashing water inlet to be backwashed.
And the backwashing water flows to a sewage tank after backwashing.
The invention also provides a system capable of realizing the process for treating desulfurization wastewater by using the membrane method, which is characterized in that: including the buffer pool that is arranged in collecting desulfurization waste water that needs desulfurization among the desulfurization system, through membrane filtration circulating pump with the carborundum membrane filter equipment that the buffer pool is connected still includes clear liquid jar, sludge impoundment, the clear liquid after carborundum membrane filter equipment filters out extremely clear liquid jar, the mud in the carborundum membrane filter equipment flows extremely after filtering sludge impoundment.
Preferably, the silicon carbide film filtering mechanism comprises at least two silicon carbide film filtering devices, each silicon carbide film filtering device comprises a hollow tube-shaped silicon carbide film filtering pipe, a plurality of filtering holes are formed in each silicon carbide film filtering pipe, the silicon carbide film filtering pipe further comprises a silicon carbide film filter shell arranged outside the silicon carbide film filtering pipe and a waste water inlet arranged at the top end/bottom end of each silicon carbide film filtering pipe, a waste water outlet is formed in the opposite end of the top end/bottom end, a gap is formed between each silicon carbide film filtering pipe and each silicon carbide film filter, and a clear liquid outlet is formed in the side wall of each silicon carbide film filtering pipe;
the desulfurization waste water is pumped to a first silicon carbide film filtering device through a film filtering circulating pump, the desulfurization waste water flows into a silicon carbide film filtering pipe through a waste water inlet of the first silicon carbide film filtering device to be primarily filtered, one part of filtering liquid after primary filtering flows out through a waste water outlet of the first silicon carbide film filtering device, the filtering liquid is pumped to a waste water inlet of a second silicon carbide film filtering device through the film filtering circulating pump, the filtering liquid flows into a silicon carbide film filtering pipe of the second silicon carbide film filtering device to be finely filtered, the other part of filtering liquid and clear liquid after fine filtering are filtered into a clear liquid tank, and sludge in the silicon carbide film filtering pipe after primary filtering and fine filtering flows to a sludge tank through the waste water outlet.
Preferably, the system further comprises a backwashing device, the backwashing device comprises a backwashing liquid pool and a backwashing pump, the sewage pool is further included, backwashing is carried out on the first silicon carbide film filtering device and the second silicon carbide film filtering device after backwashing liquid in the backwashing liquid pool is pumped to backwashing water inlets of the first silicon carbide film filtering device and the second silicon carbide film filtering device through the backwashing pump, and backwashing waste liquid is formed and flows to the sewage pool after backwashing.
Preferably, the aperture of the filtering pores is less than 0.1 um.
Compared with the prior art, the invention has the following beneficial effects:
1. the process for treating the desulfurization wastewater by the membrane method utilizes the physical filtration of a silicon carbide membrane, a flocculating agent is not required to be added in the filtration process, the filtrate generated by the filtration is clear and transparent and does not contain solid particles, no precipitate is generated in the whole process, the solid content of the filtered mother liquor is higher than that of the original desulfurization wastewater, and the filtered mother liquor can return to a desulfurization system to continue to participate in desulfurization;
2. the whole process has fewer control points, and the failure rate of the control system is low if the number of the control points is small;
3. flocculating agent is not added in the process, so that the operation cost is low;
4. because the system does not generate sediment, the pipeline is easier to convey, the blocking phenomenon is less, and the subsequent treatment is simple;
5. the system adopts the silicon carbide film, has very high strength, and has the characteristics of strong acid and strong alkali corrosion resistance, high temperature resistance, wear resistance and the like.
Drawings
FIG. 1 is a schematic flow diagram of the system of the present invention;
fig. 2 is an enlarged schematic view of the silicon carbide membrane filter device of fig. 1.
Detailed Description
The present invention will be described in detail with reference to fig. 1 and 2, and the exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
The invention provides a process for treating desulfurization wastewater by a membrane method, which comprises the following steps:
a: uniformly collecting desulfurization waste water to be desulfurized in a desulfurization system in a buffer tank 1;
b, pumping the desulfurization wastewater in the step A to a first silicon carbide membrane filtering device 31 for primary filtration through a membrane filtration circulating pump 2,
returning part of the filtered liquid after primary filtration to a membrane filtration circulating pump, and executing the next step;
the other part of the filtered liquid forms clear liquid which is filtered out to a clear liquid tank 4;
c, pumping a part of the filtered liquid subjected to the primary filtration in the step B to a second silicon carbide diaphragm filtering device 32 through a diaphragm filtering circulating pump for internal circulation type fine filtration;
and D, filtering out the clear liquid after fine filtration to a clear liquid tank, and making the sludge flow to a sludge tank 5.
And C, arranging backwashing water inlets 31-6 on the first silicon carbide membrane filtering device and the second silicon carbide membrane filtering device in the steps B and C, and pumping the backwashing liquid to the silicon carbide membrane filtering devices through the backwashing water inlets for backwashing. And the backwash water flows to a sewage tank 7 after being backwashed.
The invention also provides a system capable of realizing the process for treating the desulfurization wastewater by the membrane method, which comprises a buffer tank 1 for collecting the desulfurization wastewater to be desulfurized in a desulfurization system, a silicon carbide membrane filtering mechanism 3 connected with the buffer tank through a membrane filtering circulating pump 2, a clear liquid tank 4 and a sludge tank 5, wherein clear liquid filtered by the silicon carbide membrane filtering mechanism is filtered out to the clear liquid tank, and sludge in the filtered silicon carbide membrane filtering mechanism flows to the sludge tank.
The silicon carbide film filtering mechanism comprises at least two silicon carbide film filtering devices, each silicon carbide film filtering device comprises a hollow tube columnar silicon carbide film filtering pipe 31-1, a plurality of filtering holes are formed in the silicon carbide film filtering pipe, and the aperture of each filtering hole is smaller than 0.1 um.
The device also comprises a silicon carbide film filter shell 31-2 arranged outside the silicon carbide film filter pipe and a wastewater inlet 31-3 arranged at the top end/bottom end of the silicon carbide film filter pipe, wherein a wastewater outlet 31-4 is arranged at the opposite end of the top end/bottom end, a gap is arranged between the silicon carbide film filter pipe and the silicon carbide film filter, and a clear liquid outlet 31-5 is arranged on the side wall of the silicon carbide film filter pipe;
the desulfurization waste water is pumped to a first silicon carbide film filtering device 31 through a film filtering circulating pump, the desulfurization waste water flows into a silicon carbide film filtering pipe through a waste water inlet of the first silicon carbide film filtering device for primary filtering, one part of filtering liquid after primary filtering flows out through a waste water outlet of the first silicon carbide film filtering device, the filtering liquid is pumped to a waste water inlet of a second silicon carbide film filtering device 32 through the film filtering circulating pump, the filtering liquid flows into a silicon carbide film filtering pipe of the second silicon carbide film filtering device for fine filtering, the other part of filtering liquid and clear liquid after fine filtering are filtered to a clear liquid tank, and sludge in the silicon carbide film filtering pipe after primary filtering and fine filtering flows to a sludge pool through the waste water outlet. The core content of the membrane method for treating the desulfurization wastewater is that no flocculant is added in the desulfurization wastewater treatment process, the desulfurization wastewater is filtered by utilizing a silicon carbide membrane filter tube, the silicon carbide membrane filter tube is tubular and hollow, the wall of the silicon carbide membrane filter tube is provided with a plurality of micron-sized pores, the pore diameter of each pore is smaller than 0.1 micron, water molecules can freely pass through the pores, solid particles larger than the pore diameter of the silicon carbide cannot pass through the silicon carbide micropores, the water molecules in the desulfurization wastewater flow out of the silicon carbide tubes through the silicon carbide micropores to form clean water, the solid particles in the desulfurization wastewater are intercepted in the tubes, and the solid-liquid separation of the desulfurization wastewater is realized.
The system further comprises a backwashing device, the backwashing device comprises a backwashing liquid pool 6, a backwashing pump and a sewage pool, backwashing is carried out on the first silicon carbide film filtering device and the second silicon carbide film filtering device after backwashing liquid in the backwashing liquid pool is pumped to backwashing water inlets 31-6 of the first silicon carbide film filtering device and the second silicon carbide film filtering device through the backwashing pump, and backwashing waste liquid is formed and flows to the sewage pool 7 after backwashing.
During operation, solid particles larger than 0.1 micron can not pass through the micropores, and the solid particles are trapped on the surface of the silicon carbide film filter tube. The multi-branch pipe columnar silicon carbide film filter pipe is assembled in the steel shell to form a silicon carbide film filter device, a gap between the outside of the silicon carbide film filter pipe and the shell of the silicon carbide film filter is a filtered clear liquid channel, a circulating desulfurization wastewater channel is arranged in the silicon carbide film pipe, the circulating flow rate of the desulfurization wastewater in the pipe is high, and the concentrated desulfurization wastewater is not easy to precipitate and adhere in the silicon carbide film pipe.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (7)
1. A process for treating desulfurization wastewater by a membrane method is characterized by comprising the following steps: the method comprises the following steps:
a: the desulfurization waste water to be desulfurized in a desulfurization system is uniformly collected in a buffer pool (1);
b, pumping the desulfurization wastewater in the step A to a first silicon carbide diaphragm filtering device (31) through a diaphragm filtering circulating pump (2) for primary filtering,
returning part of the filtered liquid after primary filtration to a membrane filtration circulating pump, and executing the next step;
the other part of the filtered liquid forms clear liquid which is filtered out to a clear liquid tank (4);
c, pumping a part of the filtered liquid subjected to the primary filtration in the step B to a second silicon carbide diaphragm filtering device (32) through a diaphragm filtering circulating pump for internal circulation type fine filtration;
and D, filtering out the clear liquid after fine filtration to a clear liquid tank, and making the sludge flow to a sludge tank (5).
2. The membrane method process for treating desulfurization wastewater according to claim 1, characterized in that:
and the first silicon carbide membrane filtering device and the second silicon carbide membrane filtering device in the step B and the step C are both provided with backwashing water inlets (31-6), and the backwashing liquid is pumped to the silicon carbide membrane filtering devices through the backwashing water inlets for backwashing.
3. The membrane method process for treating desulfurization wastewater according to claim 2, characterized in that: and the backwash water flows to a sewage tank (7) after being backwashed.
4. A system capable of realizing the process for treating desulfurization wastewater by using the membrane method is characterized in that: including buffer pool (1) that is arranged in collecting desulfurization waste water that needs desulfurization among the desulfurization system, through membrane filtration circulating pump (2) with carborundum membrane filter mechanism (3) that the buffer pool is connected still include clear liquid jar (4), sludge impoundment (5), the clear liquid after carborundum membrane filter mechanism filters out extremely clear liquid jar, the mud in the carborundum membrane filter mechanism flows extremely after filtering sludge impoundment.
5. The system of claim 4, wherein: the silicon carbide film filtering mechanism comprises at least two silicon carbide film filtering devices, each silicon carbide film filtering device comprises a hollow tube-shaped silicon carbide film filtering pipe (31-1), a plurality of filtering holes are formed in each silicon carbide film filtering pipe, the silicon carbide film filtering pipe further comprises a silicon carbide film filter shell (31-2) arranged outside the silicon carbide film filtering pipe and a waste water inlet (31-3) arranged at the top end/bottom end of each silicon carbide film filtering pipe, a waste water outlet (31-4) is formed in the opposite end of the top end/bottom end, a gap is formed between each silicon carbide film filtering pipe and each silicon carbide film filter, and a clear liquid outlet (31-5) is formed in the side wall of each silicon carbide film filtering;
the desulfurization wastewater is pumped to a first silicon carbide film filtering device (31) through a film filtering circulating pump, flows into a silicon carbide film filtering pipe through a wastewater inlet of the first silicon carbide film filtering device for primary filtering, part of filtering liquid after primary filtering flows out through a wastewater outlet of the first silicon carbide film filtering device, then is pumped to a wastewater inlet of a second silicon carbide film filtering device (32) through the film filtering circulating pump, then flows into the silicon carbide film filtering pipe of the second silicon carbide film filtering device for fine filtering, the other part of filtering liquid and clear liquid after fine filtering are filtered to a clear liquid tank, and sludge in the silicon carbide film filtering pipe after primary filtering and fine filtering flows to the sludge tank through the wastewater outlet.
6. The system of claim 5, wherein: the system further comprises a backwashing device, the backwashing device comprises a backwashing liquid pool (6), a backwashing pump and a sewage pool, backwashing is carried out on the first silicon carbide film filtering device and the second silicon carbide film filtering device after backwashing liquid in the backwashing liquid pool is pumped to a backwashing water inlet (31-6) of the first silicon carbide film filtering device and the second silicon carbide film filtering device through the backwashing pump, and backwashing waste liquid is formed to flow to the sewage pool (7) after backwashing.
7. The system of claim 5, wherein: the aperture of the filter hole is less than 0.1 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010229489.5A CN111410270A (en) | 2020-03-27 | 2020-03-27 | Process and system for treating desulfurization wastewater by membrane method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010229489.5A CN111410270A (en) | 2020-03-27 | 2020-03-27 | Process and system for treating desulfurization wastewater by membrane method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117886401A (en) * | 2023-04-24 | 2024-04-16 | 聂鹏飞 | A thermal power plant desulfurization wastewater clarification process based on silicon carbide membrane ultrafiltration technology |
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- 2020-03-27 CN CN202010229489.5A patent/CN111410270A/en active Pending
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