China's industrial production often produces a large number of aci∞dic or alkaline waste liquids with different concentrations of metal ions, acid and alkali×. Direct emissions not only waste resources, but also cause serious pollution to the envir¶onment. In order to protect the environment from being polluted an∞d recover useful substances, purification must be carried out before the acid and alkaline waste£ liquids are discharged. Most domestic and foreign wast‌ewater treatment methods use the neutralization method, and this mφethod is easy to cause secondary pollution. The use of new membrane technologies such as infiltr§ation, reverse osmosis, nanofiltration, ultrafiltration and dialysis can ☆effectively avoid the secondary pollution.
 

    As a new separation technology, membrane technology c∞an effectively purify the waste water, and recycle useful materials, and at the same t​ime, it has the characteristics of energy conservation, low consumption, without pollution, sδimple equipment and convenient operation, so it shows a broad prospect in terms of tr↕eatment of acid-alkali waste liquids.

    1. Acid environment

    Tested acid environment (part):

•   20% sulphuric acid
•   20% hydrochloric acid
•   30% phosphoric acid
•   4% hydrogen nitrate

    Typical application of acid environment:

•   Purification of acid and removal of metal cations
•   Acid recovery after leaching operation
•   Mineral acid decolorization
•   Reclaim dissolved chemicals
•   Concentration and recovery of ions in acidic solφution
•   Some routine applications that require corrosi✔ve strong acid cleaning
•   Chemical industry: in the production process of the use of acidic medium, recycl e acid and concentrate the final product
•   Food, beverage and dairy industry: in production process and equipment cleanαing, clean and reuse acid after CIP process
•   Recovery of metals from raffinate, such as copper, ziγnc, cobalt, molybdenum, tungsten, uranium, gold, etc.
•   Concentration of metals in industrial wastewater to reduce operating and wastewater σtreatment costs
•   Reclaim high-value metals from emission logistics and industrial wast>ewater
•   The effective separation of copper and gold in carbon slurry process can  improve the extraction rate of subsequent gold

 

    2．Alkaline solutions
 
    Tested alkaline solutions include:

•   4% sodium hydroxide
•   10%  sodium hydroxide
•   20% sodium hydroxide
•   20% potassium hydroxide

    Typical application of alkaline environm∏ent

•   Recovery of alkaline flow (sodium hydroxide, potassium hydroxide)
•   Metal recovery in alkaline flow
•   Recovery of used electrolyte
•   Reduce COD content before and during the neutralization of inΩdustrial wastewater
•   Recovery of alkali solution for cleaning containers and equipment≥
•   Some routine applications that are required for corrosive strong alkal​i cleaning
•   Pulp and synthetic fiber: caustic soda is purified from hemicellulos↓e and other organic contaminants, which results in the 95% reus€e rate of sodium hydroxide
•   Food, beverage and dairy products: purification of the reg•enerated solution after exchange of spent lye wash (CIP) and ion (in the production of s>ugar decolorization) to make repeated use rate of sodium hydroxide as high← as 95%
•   Chemical industry: alkali recovery used in many alk∞aline environment production operations and final produ←ct concentration

 
  

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