CN112010437A - Method and device for treating power plant desulfurization wastewater by using nano membrane and application - Google Patents
Method and device for treating power plant desulfurization wastewater by using nano membrane and application Download PDFInfo
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- CN112010437A CN112010437A CN201910458845.8A CN201910458845A CN112010437A CN 112010437 A CN112010437 A CN 112010437A CN 201910458845 A CN201910458845 A CN 201910458845A CN 112010437 A CN112010437 A CN 112010437A
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- wastewater
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- 239000002351 wastewater Substances 0.000 title claims abstract description 63
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 33
- 230000023556 desulfurization Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000012528 membrane Substances 0.000 title claims abstract description 31
- 238000001914 filtration Methods 0.000 claims abstract description 50
- 238000001471 micro-filtration Methods 0.000 claims abstract description 11
- 239000002120 nanofilm Substances 0.000 claims abstract description 10
- 238000001728 nano-filtration Methods 0.000 claims abstract description 8
- 239000002244 precipitate Substances 0.000 claims abstract description 8
- 239000006228 supernatant Substances 0.000 claims abstract description 8
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 6
- 239000000706 filtrate Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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 embodiment of the invention discloses a method, a device and application for treating desulfurization wastewater of a power plant by using a nano-film, wherein the method for treating desulfurization wastewater of the power plant by using the nano-film comprises the steps of firstly, collecting the wastewater of the power plant, clarifying the wastewater of the power plant, and respectively collecting supernatant and precipitate; step two, coarsely filtering the collected supernatant and storing for later use; and step three, filtering the power plant wastewater after coarse filtration by a precise filtration filter element, a microfiltration membrane filter element, an ultrafiltration membrane filter element and a nanofiltration membrane filter element in sequence, and collecting filtrate, namely realizing the treatment of the power plant desulfurization wastewater. This application utilizes nanometer membrane to carry out the processing of power plant's desulfurization waste water, reduces the chemical use, and especially the use that contains the chloride ion chemical can effectively improve follow-up chloride ion to the potential influence of desulfurization effect. The whole process is a pure physical process, and no additional influence is caused on the environment; and the utilization of useful heavy metals in the wastewater is improved, and secondary pollution to underground water quality and environment after discharge is prevented.
Description
Technical Field
The embodiment of the invention relates to the technical field of power plant desulfurization wastewater treatment, and particularly relates to a method and a device for treating power plant desulfurization wastewater by using a nano membrane, and application of the method and the device.
Background
At present, most of the existing thermal power generating units in service and newly built are equipped with a wet flue gas desulfurization device so as to ensure that the flue gas discharged by the coal-fired boiler of the thermal power generating unit reaches the standard, and particularly reaches the strict environmental protection ultralow emission standard. Among them, over 90% of coal-fired power plants adopt limestone-gypsum wet desulphurization process and its device, the process has outstanding advantages and wide application, and its main by-products are desulphurization gypsum and desulphurization waste water. The desulfurized gypsum can be reused, but the desulfurized wastewater contains a large amount of impurities, such as suspended matters, inorganic salt ions, heavy metal ions and the like, and needs to be purified to be discharged, which undoubtedly generates a huge operation and maintenance cost.
At present, desulfurization waste water of a power plant is generally treated by adopting a chemical dosing mode, and treated concentrated water returns to an absorption tower to cause the concentration of heavy metal ions in slurry in the absorption tower to be increased in a node-by-node manner, so that the heavy metal ions have to be replaced and discharged at regular intervals, and waste and new pollution are caused.
Disclosure of Invention
Therefore, the embodiment of the invention provides a method for treating desulfurization wastewater of a power plant by using a nano-film and application thereof, and aims to solve the problems that the concentration of heavy metal ions in slurry in an absorption tower is increased in a node manner and the discharge has to be replaced periodically, so that waste and new pollution are caused because the treated concentrated water is returned to the absorption tower due to the chemical dosing treatment in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a method for treating power plant desulfurization wastewater by using a nano-film comprises the following steps:
step one, collecting power plant wastewater, clarifying the power plant wastewater, and respectively collecting supernatant and precipitate for later use;
step two, coarsely filtering the collected supernatant and storing for later use;
and step three, filtering the power plant wastewater after coarse filtration by a precise filtration filter element, a microfiltration membrane filter element, an ultrafiltration membrane filter element and a nanofiltration membrane filter element in sequence, and collecting filtrate, namely realizing the treatment of the power plant desulfurization wastewater.
Further, the precise filter elementThe filtration area is 0.3-0.5 m2The filtration precision is 0.9-1.1 μm, and the pressure resistance is 0.9-1.1 MPa.
Furthermore, the filtering area of the microfiltration membrane filter core is 0.3-0.5 m20.9 to 1.1 μm and a withstand voltage of 0.9 to 1.1 MPa.
Furthermore, the area of the filter element of the nanofiltration membrane is 0.3 to 0.5m2The filtration precision is 200 molecular weight cut-off, and the pressure resistance is 0.9-1.1 MPa.
Further, the precipitate collected in the first step is discharged after dehydration.
According to a second aspect of the embodiment of the invention, the filtering device applied to the method for treating the desulfurization wastewater of the power plant by using the nano-membrane comprises a wastewater pool, a filtering pool arranged below the wastewater pool, and a dehydrator arranged on one side of the wastewater pool, wherein a filtering layer is arranged in the filtering pool, the wastewater pool is communicated with the filtering pool through a liquid conveying pipe, and the wastewater pool is communicated with the dehydrator through a discharging pipe.
Furthermore, the filter layer filter including the microfiltration filter core, micro-filtration membrane filter core, ultrafiltration membrane filter core and receive the filter core of filter that from top to bottom connect gradually.
Furthermore, the two sides of the filter layer are provided with clamping blocks, and the filter tank is provided with clamping hooks matched with the clamping blocks for use.
Furthermore, the lower extreme of filtering ponds is equipped with the leakage fluid dram, is equipped with sealed lid on this leakage fluid dram.
According to a third aspect of the embodiment of the invention, the method for treating the power plant desulfurization wastewater by using the nano-film is applied to power plant wastewater desulfurization.
The embodiment of the invention has the following advantages: the embodiment of the invention provides a method, a device and application for treating desulfurization wastewater of a power plant by using a nano-film. The whole treatment process is a pure physical process, and has no additional influence on the environment; and the utilization rate of useful heavy metals in the wastewater is improved, and secondary pollution to underground water quality and environment after discharge is prevented. The filtering device is simple in structure and reasonable in design, and can greatly improve the filtering effect. In addition, the method has better effect when being used for treating the desulfurization wastewater of the power plant.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic structural diagram of a filtering apparatus applied to the method for treating power plant desulfurization wastewater by using a nanomembrane according to example 2 of the present invention;
in the figure: 1-a wastewater pond; 2-a filter tank; 3-a dehydrator; 4, a filter layer; 5, a transfusion tube; 6-discharge pipe; 7, a fixture block; 8, clamping and hooking; 9-liquid drain.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a method for treating power plant desulfurization wastewater by using a nano-film, which comprises the following steps:
step one, collecting power plant wastewater, clarifying the power plant wastewater, and respectively collecting supernatant and precipitate for later use;
step two, coarsely filtering the collected supernatant and storing for later use;
and step three, filtering the power plant wastewater after coarse filtration by a precise filtration filter element, a microfiltration membrane filter element, an ultrafiltration membrane filter element and a nanofiltration membrane filter element in sequence, and collecting filtrate, namely realizing the treatment of the power plant desulfurization wastewater.
Preferably, the filtering area of the precise filtering filter element is 0.3-0.5 m2The filtration precision is 0.9-1.1 μm, and the pressure resistance is 0.9-1.1 MPa.
Preferably, the filtering area of the microfiltration membrane filter element is 0.3-0.5 m20.9 to 1.1 μm and a withstand voltage of 0.9 to 1.1 MPa.
Preferably, the area of the filter element of the nanofiltration membrane is 0.3-0.5 m2The filtration precision is 200 molecular weight cut-off, and the pressure resistance is 0.9-1.1 MPa.
Preferably, the precipitate collected in the first step is discharged after dehydration.
According to the method provided by the embodiment, the desulfurization wastewater is treated by utilizing the nano-film, the use of chemicals is reduced, and particularly, the potential influence of subsequent chloride ions on the desulfurization effect can be effectively improved by using chemicals containing chloride ions. The whole process is a pure physical process, and has no additional influence on the environment; and the utilization of useful heavy metals in the wastewater is improved, and secondary pollution to underground water quality and environment after discharge is prevented.
Example 2
As shown in fig. 1, the present embodiment further provides a filtering apparatus applied to the method for treating desulfurization wastewater of a power plant by using a nano-membrane, including a wastewater tank 1, a filtering tank 2 disposed below the wastewater tank 1, and a dehydrator 3 disposed on one side of the wastewater tank 1, wherein a filtering layer 4 is disposed in the filtering tank 2, the wastewater tank 1 is communicated with the filtering tank 2 through a liquid transport tube 5, and the wastewater tank 1 is communicated with the dehydrator 3 through a discharge tube 6.
Preferably, the filter layer 4 comprises a precise filter element, a micro-filtration membrane filter element, an ultra-filtration membrane filter element and a nano-filtration membrane filter element which are sequentially connected from top to bottom.
Preferably, the two sides of the filter layer 4 are provided with clamping blocks 7, and the filter tank 2 is provided with clamping hooks 8 matched with the clamping blocks 7 for use.
Preferably, the lower end of the filtering tank 2 is provided with a liquid outlet 9, and the liquid outlet 9 is provided with a sealing cover.
In addition, the embodiment also provides application of the method for treating the power plant desulfurization wastewater by using the nano-film in power plant wastewater desulfurization.
The filter device that this embodiment provided simple structure, convenient to use, especially when the filter layer goes wrong direct replacement can.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A method for treating power plant desulfurization wastewater by using a nano-film is characterized by comprising the following steps:
step one, collecting power plant wastewater, clarifying the power plant wastewater, and respectively collecting supernatant and precipitate for later use;
step two, coarsely filtering the collected supernatant and storing for later use;
and step three, filtering the power plant wastewater after coarse filtration by a precise filtration filter element, a microfiltration membrane filter element, an ultrafiltration membrane filter element and a nanofiltration membrane filter element in sequence, and collecting filtrate, namely realizing desulfurization treatment of the power plant wastewater.
2. The method for treating power plant desulfurization wastewater by using the nanomembrane as recited in claim 1, wherein: the precise filterThe filter area of the core is 0.3-0.5 m2The filtration precision is 0.9-1.1 μm, and the pressure resistance is 0.9-1.1 MPa.
3. The method for treating power plant desulfurization wastewater by using the nanomembrane as recited in claim 1, wherein: the filtering area of the microfiltration membrane filter core is 0.3-0.5 m20.9 to 1.1 μm and a withstand voltage of 0.9 to 1.1 MPa.
4. The method for treating power plant desulfurization wastewater by using the nanomembrane as recited in claim 1, wherein: the area of the filter core of the nanofiltration membrane is 0.3-0.5 m2The filtration precision is 200 molecular weight cut-off, and the pressure resistance is 0.9-1.1 MPa.
5. The method for treating power plant desulfurization wastewater by using the nanomembrane as recited in claim 1, wherein: and (4) dewatering the precipitate collected in the first step and then discharging the precipitate.
6. A filter device for use in the method according to any one of claims 1 to 5, wherein: the filter device comprises a wastewater pool, a filter tank arranged below the wastewater pool and a dehydrator arranged on one side of the wastewater pool, wherein a filter layer is arranged in the filter tank, the wastewater pool is communicated with the filter tank through a liquid conveying pipe, and the wastewater pool is communicated with the dehydrator through a discharge pipe.
7. The filtration device of claim 6, wherein: the filter layer filter including the fine filtration filter core, micro-filtration membrane filter core, milipore filter core and receive filter membrane filter core that from top to bottom connect gradually.
8. The filtration device of claim 6, wherein: clamping blocks are arranged on two sides of the filtering layer, and clamping hooks matched with the clamping blocks for use are arranged on the filtering tank.
9. The filtration device of claim 6, wherein: the lower extreme of filtering ponds is equipped with the leakage fluid dram, is equipped with sealed lid on this leakage fluid dram.
10. Use of the method according to any one of claims 1-5 for desulphurization of power plant wastewater.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910458845.8A CN112010437A (en) | 2019-05-29 | 2019-05-29 | Method and device for treating power plant desulfurization wastewater by using nano membrane and application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910458845.8A CN112010437A (en) | 2019-05-29 | 2019-05-29 | Method and device for treating power plant desulfurization wastewater by using nano membrane and application |
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| CN112010437A true CN112010437A (en) | 2020-12-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202576135U (en) * | 2012-05-21 | 2012-12-05 | 杭州美亚水处理科技有限公司 | Device for producing drinking water through coal mine water |
| WO2017133511A1 (en) * | 2016-02-05 | 2017-08-10 | 大唐环境产业集团股份有限公司 | Treatment apparatus and method for zero liquid discharge of desulfurization wastewater |
| CN107117758A (en) * | 2017-06-05 | 2017-09-01 | 南京工大环境科技有限公司 | A kind of power plant desulfurization wastewater low consumption Zero discharge treatment method |
| CN206872572U (en) * | 2017-06-23 | 2018-01-12 | 华夏隆盛（北京）科技有限公司 | A kind of NF membrane advanced purification system for handling Desulphurization for Coal-fired Power Plant waste water |
| CN108751491A (en) * | 2018-05-31 | 2018-11-06 | 武汉大学 | A kind of high saliferous condensed oil sewage advanced treating integration technique of membrane |
-
2019
- 2019-05-29 CN CN201910458845.8A patent/CN112010437A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN202576135U (en) * | 2012-05-21 | 2012-12-05 | 杭州美亚水处理科技有限公司 | Device for producing drinking water through coal mine water |
| WO2017133511A1 (en) * | 2016-02-05 | 2017-08-10 | 大唐环境产业集团股份有限公司 | Treatment apparatus and method for zero liquid discharge of desulfurization wastewater |
| CN107117758A (en) * | 2017-06-05 | 2017-09-01 | 南京工大环境科技有限公司 | A kind of power plant desulfurization wastewater low consumption Zero discharge treatment method |
| CN206872572U (en) * | 2017-06-23 | 2018-01-12 | 华夏隆盛（北京）科技有限公司 | A kind of NF membrane advanced purification system for handling Desulphurization for Coal-fired Power Plant waste water |
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Non-Patent Citations (1)
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| 齐立强等: "《发电厂动力与环保》", 28 February 2019, 北京：冶金工业出版社 * |
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