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Method for recycling waste liquor produced in preparation of reverse osmosis membrane

A technology of reverse osmosis membrane and recovery method, which is applied in the field of waste liquid recovery system, can solve the problems of complex procedures and low treatment efficiency, and achieve the effects of ensuring filtration efficiency, reducing concentration time, and reducing pollution

Inactive Publication Date: 2017-12-08
VONTRON MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to use the current method to process, not only the processing efficiency is low, but also the program is complicated, and there is a certain difficulty in large-scale processing

Method used

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  • Method for recycling waste liquor produced in preparation of reverse osmosis membrane

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Comparison scheme
Effect test

Embodiment 1

[0021] A method for recycling waste liquid from reverse osmosis membrane production, comprising the following steps:

[0022] (1) The low-concentration reverse osmosis membrane membrane-making waste liquid from the production workshop is pre-filtered through a stainless steel screen to obtain the low-concentration reverse osmosis membrane membrane-making waste liquid of the primary filter;

[0023] (2) The reverse osmosis membrane low-concentration membrane-making waste liquid filtered through step (1) is filtered through a PP cotton filter element;

[0024] (3) the reverse osmosis membrane film making waste liquid after the secondary filtration of step (2) is concentrated with a solvent-resistant separation membrane;

[0025] (4) More than 10% of the reverse osmosis membrane membrane-making waste liquid enters the rectification tower after being concentrated in step (3) and carries out rectification recovery to obtain high-purity reverse osmosis membrane membrane-making raw m...

Embodiment 2

[0032] A method for recycling waste liquid from reverse osmosis membrane production, comprising the following steps:

[0033] (1) The low-concentration reverse osmosis membrane membrane-making waste liquid from the production workshop is pre-filtered through a stainless steel screen to obtain the low-concentration reverse osmosis membrane membrane-making waste liquid of the primary filter;

[0034] (2) The reverse osmosis membrane low-concentration membrane-making waste liquid filtered through step (1) is filtered through a PP cotton filter element;

[0035] (3) the reverse osmosis membrane film making waste liquid after the secondary filtration of step (2) is concentrated with a solvent-resistant separation membrane;

[0036] (4) More than 10% of the reverse osmosis membrane membrane-making waste liquid enters the rectification tower after being concentrated in step (3) and carries out rectification recovery to obtain high-purity reverse osmosis membrane membrane-making raw m...

Embodiment 3

[0043] A method for recycling waste liquid from reverse osmosis membrane production, comprising the following steps:

[0044] (1) The low-concentration reverse osmosis membrane membrane-making waste liquid from the production workshop is pre-filtered through a stainless steel screen to obtain the low-concentration reverse osmosis membrane membrane-making waste liquid of the primary filter;

[0045] (2) The reverse osmosis membrane low-concentration membrane-making waste liquid filtered through step (1) is filtered through a PP cotton filter element;

[0046] (3) the reverse osmosis membrane film making waste liquid after the secondary filtration of step (2) is concentrated with a solvent-resistant separation membrane;

[0047] (4) More than 10% of the reverse osmosis membrane membrane-making waste liquid enters the rectification tower after being concentrated in step (3) and carries out rectification recovery to obtain high-purity reverse osmosis membrane membrane-making raw m...

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Abstract

The invention relates to a waste liquor recycling system, in particular to a method for recycling waste liquor produced in preparation of a reverse osmosis membrane. The method comprises the following steps: filtering the waste liquor produced in preparation of the reverse osmosis membrane through a stainless steel filter screen and a PP cotton filter element to remove granular impurities, further concentrating the waste liquor by virtue of a solvent-resistant separation membrane to obtain membrane preparation waste liquor with the concentration exceeding 10 percent, and performing rectification recycling by virtue of a rectification column to obtain a high-purity membrane preparation raw material. The technology in the method is convenient to operate, the equipment investment is less and the waste liquor treatment efficiency and the raw material recycling rate are high, so that not only are the pollutions caused by the waste liquor to the environment reduced, but also the utilization rate of the raw material is increased.

Description

technical field [0001] The invention relates to a recovery system of waste liquid, in particular to a method for recovery of waste liquid from reverse osmosis membrane production. Background technique [0002] Reverse osmosis membrane is an advanced membrane separation technology, which is widely used in the fields of electronics, food, pharmaceuticals and chemical industry, but in the process of producing reverse osmosis membrane, it will produce wastewater containing high concentration of dimethylformamide (DMF) . DMF has stable chemical properties, can enter the human body through the respiratory tract, digestive tract and skin, and has certain toxicity. At present, the treatment methods for high-concentration DMF wastewater include Fenton oxidation, alkaline hydrolysis, extraction, membrane separation, and ozone oxidation. For example, the document "Zhang Hui, Ye Changshen, Lin Cheng. Mass transfer coefficient of chloroform extraction of DMF in a mechanically stirred e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/04C02F1/44C02F9/00
Inventor 梁永红王思亮梁松苗
Owner VONTRON MEMBRANE TECH CO LTD
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