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Teijin's Combined System for Wastewater Treatment Used by Dye Factory in China
 

Tokyo, May 16, 2011 (JCN) - Teijin's Multi-Stage Activated Biological Process (MSABP) system and Electro Catalytic Method Treatment (ELCAT) system will be used to treat wastewater at a fluorescent dye factory of Zhaoyuan Advanced Chemical in Jiangsu Province, China. A capital affiliate of Nippon Kayaku in Japan, Zhaoyuan Advanced Chemical will become the first company in China to use Teijin's ELCAT system.

The MSABP system, which features special biological carriers packed with high concentrations of microorganisms, uses multistage aeration tanks to enable microorganisms in each tank to be changed in an orderly manner, thereby forming a food chain in which even highly concentrated or persistent effluent is decomposed. The system enables wastewater treatment with reduced sludge, reduced energy consumption, low maintenance and low-cost.

ELCAT is a two-stage wastewater treatment system that decomposes and treats persistent organic substances by making them easier to decompose. The system comprises an electrolytic tank, which generates easily decomposed intermediates by forming hypochlorous acids through the addition of salt and oxidizing organic substances, and a catalytic tank, which gasifies and decomposes the intermediates and surplus hypochlorous acids by means of oxidoreduction reactions. ELCAT effectively treats dyes, herbicides, phenols, cyanide and other organic matter that cannot be eliminated biologically.

The combination of MSABP and ELCAT enables Teijin's system to efficiently decompose and eliminate a wide variety of persistent organic substances, resulting in a wastewater treatment process that complies with environmental regulations and significantly reduces dilution-water requirements.

Teijin is gradually developing its market in China for wastewater treatment. At the Water Purification Treatment (WPT) Research and Evaluation Office, which Teijin built and operates on the premises of Suzhou Kangrui Environmental Science & Technology Co., Ltd., the company is testing systems scheduled for actual application in China. In addition, Teijin is collaborating with the rural community of Yixing, Jiangsu Province to field test a system for sewage treatment.

By Chris Lui Staff Writer

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