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Preparation method and application of polyethersulfone nanofiltration membrane for intercepting nitrate

A technology of polyethersulfone and nitrate, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems that cannot meet the requirements of the advanced treatment of Class A drainage of urban sewage treatment plants, and achieve the cost of production Low cost, improved interception performance, and improved nitrate interception effect

Active Publication Date: 2022-06-28
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the interception rate of nitrate by the nanofiltration membrane prepared in the above research report has been greatly improved, it still cannot meet the requirements for the advanced treatment of the first-level A drainage of urban sewage treatment plants.

Method used

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  • Preparation method and application of polyethersulfone nanofiltration membrane for intercepting nitrate
  • Preparation method and application of polyethersulfone nanofiltration membrane for intercepting nitrate
  • Preparation method and application of polyethersulfone nanofiltration membrane for intercepting nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1: the method of the present invention prepares nanofiltration membrane;

[0070] (1) Preparation of polyethersulfone-based membrane;

[0071] First, 31g of N,N-dimethylacetamide, 8g of polyethersulfone powder, and 0.2g of polyvinylpyrrolidone were added to the beaker in turn, and the beaker was placed on a magnetic stirrer for magnetic stirring. The stirring temperature was room temperature and the stirring rate was 300r. / min, the stirring time is 8h, stop stirring after the added drug is completely dissolved, then place the beaker at room temperature for 12h to remove possible bubbles, and finally use the phase inversion method to make the film casting solution in deionized water. The condensing bath is used to form a membrane, and the membrane is washed with deionized water to obtain a polyethersulfone-based membrane;

[0072] (2) Preparation of aqueous solution;

[0073] First, 0.1 g of anhydrous piperazine, 0.95 g of m-phenylenediamine, and 0.95 g of ...

Embodiment 2

[0095] Example 2: Replacement conditions Nanofiltration membrane prepared by the method of the present invention;

[0096] (1) Preparation of polyethersulfone nanofiltration membrane;

[0097] (1) Preparation of polyethersulfone-based membrane:

[0098] The preparation method of polyethersulfone-based membrane is the same as that in Example 1;

[0099] (2) Preparation of aqueous solution:

[0100] Except that the medicines used are 0.3g anhydrous piperazine, 0.85g m-phenylenediamine, 0.85g 3,5-diaminobenzoic acid, others are the same as in Example 1, so they will not be described in detail;

[0101] (3) Preparation of organic phase solution:

[0102] It is the same as Example 1, so it will not be described in detail;

[0103] (4) Preparation of high-efficiency nitrate retention polyethersulfone nanofiltration membrane:

[0104] ① Water-phase immersion treatment of polyethersulfone-based membrane;

[0105] Except that the immersion time is 6min, other is the same as Examp...

Embodiment 3

[0113] Example 3: Replacement conditions The method of the present invention prepares a nanofiltration membrane;

[0114] (1) Preparation of polyethersulfone nanofiltration membrane;

[0115] (1) Preparation of polyethersulfone-based membrane:

[0116] There is no significant difference between the preparation of the polyethersulfone-based membrane and the polyethersulfone-based membrane prepared in Example 1, so it will not be described in detail;

[0117] (2) Preparation of aqueous solution:

[0118] Except that the medicines used are 0.4g anhydrous piperazine, 0.8g m-phenylenediamine, 0.8g 3,5-diaminobenzoic acid, others are the same as in Example 1, so they will not be described in detail;

[0119] (3) Preparation of organic phase solution:

[0120] It is the same as Example 1, so it will not be described in detail;

[0121] (4) Preparation of high-efficiency nitrate retention polyethersulfone nanofiltration membrane:

[0122] ① Water-phase immersion treatment of poly...

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Abstract

The invention discloses a preparation method of a polyethersulfone nanofiltration membrane with excellent nitrate interception performance and an application research on the advanced treatment of urban sewage. Firstly, the polyethersulfone-based film is coated on the non-woven fabric, and then the aqueous solution of anhydrous piperazine-m-phenylenediamine-3,5-diaminobenzoic acid is used as the water phase, and the organic solution of trimesoyl chloride-n-hexane is used as the For the organic phase, the polyethersulfone nanofiltration membrane that can efficiently intercept nitrate is prepared by interfacial polymerization technology. The prepared polyethersulfone nanofiltration membrane has excellent nitrate interception efficiency, and the nitrate removal rate reaches 89.6% to 94.24%; the total nitrogen removal efficiency in the first-class A drainage of urban sewage is 87.15% to 90.42%, and the total nitrogen index after treatment It can meet the limit value requirements of Class V of the surface water environmental quality standard. The raw materials used in the present invention are cheap and easy to obtain, the process is convenient and easy to control, and the interception efficiency of the prepared nanofiltration membrane for various concentrations of nitrate is high, which provides strong technical support for the treatment of eutrophication in the water environment and the development of urban sewage resources , the application prospect is promising.

Description

technical field [0001] The invention belongs to the technical field of separation membrane preparation, and relates to a preparation and application technology of a nitrate-retaining polyethersulfone nanofiltration membrane. Background technique [0002] At present, in order to solve the problems of water shortage, water environment pollution, and water ecological damage, the National Environmental Protection Department has clarified the guiding opinions on promoting the utilization of sewage resources, and requires accelerating the utilization of urban domestic sewage resources. The priority is to convert the wastewater that meets the discharge standards into usable water resources, which can be reused for industrial production and replenish natural water bodies nearby, and promote the recycling of regional sewage resources. Compared with the discharge level A limit index in the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002) currently implem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D71/68B01D69/02B01D67/00C02F1/44C02F101/16
CPCB01D71/82B01D71/68B01D69/02B01D67/0006C02F1/442C02F2101/163
Inventor 王秀丽宋来洲李希达晏秀丽马亚龙冯娜张晓张春青马吉忠
Owner YANSHAN UNIV