In China's industrial production, a large numbe¥r of acidic or alkaline waste liquids are usually produced, which c ontain different concentrations of metal ions and acid-base. The direct discharge not onlyπ wastes resources, but also causes serious polluti¥on to the environment. In order to protect the environment from pollution and to reco≠ver useful material, it is necessary to purify theλ acid and alkali waste liquid before it is discharged. Most of the∑ treatment of this kind of waste water is neutrali‌zed at home and abroad, and this treatment is easy to cause secondary pol♥lution. The new membrane technology, such as permeation, r$everse osmosis, nanofiltration, ultrafiltration and dialysis, can effectively avoid secon‍dary pollution.

As a new separation technology, membrane technology can effectively purify the wasβte water, and recycle the useful material, and has the characteristics of energy sav€ing, low consumption, no pollution, simple equipment, convenient operation, so it shows broad >prospects in terms of pH of the waste water treatment.
 
1. Acid environment

Acid solutions (part) that have been tested:

•   20% H₂SO₄
•   20% HCl 
•   30% H₃PO₄
•   4% HNO₃

Typical applications in acid environment:

•   Purify acid and remove metal cations
•   Recovery of acid after leaching operation
•   Mineral acid decolorization
•   Recovery of dissolved chemicals
•   Concentration and recovery of ions in an acid₹ solution
•   Some conventional applications that need to be used for​ corrosive strong acid cleaning
•   Chemical industry: the recovery of acid and the final product in the process o<f producing acid medium
•   Food, beverage and dairy industry: purify the acid after the use o™f the CIP process and reuse in the process of production and the cleanin™g of equipment.
•   Recovery of metals from the extractive solution, such as copper, zinc,  cobalt, molybdenum, tungsten, uranium, gold, etc..
•   Reducing the cost of operation and sewage treatment
•   Recovery of high value metals from emission and industria l waste water
•   Pre separation of copper and gold in the process of carbon slur&ry to improve the extraction rate of subsequent gold.

 
2. Alkaline environment

The tested alkaline solutions include:

•   4% NaOH
•   10% NaOH
•   20% NaOH
•   20% KOH

Typical applications in alkaline environment

•   Recovery of alkaline current (sodium hydrox∏ide, potassium hydroxide)
•   Recovery of metal in alkaline flow
•   Recovery of used electrolyte
•   Reducing COD content before neutralizing industrαial waste water
•   Recovery of alkaline solution for cleaning containers and equipment
•   Some conventional applications that need caus¶tic alkali cleaning
•   Pulp and artificial fiber: purification of caustic soda from hemicellulose an∏d other organic pollutants to make sodium hydroxide reusable up to 95%
•   Food, beverage and dairy products: Purification of waste lye w↕ashing flow (CIP) solution and regenerated solution (in Decolorization of sugar) after ion e"xchange, to make the repeated use rate of sodium hydrate up to 95%;
•  Chemical: alkali recovery and final product concentration used in' many alkaline environmental production operations.

 
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