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Complex tannery wastewater because of its water quality ingredients and a high concentration of organic pollutants , poor biodegradability , high sulphide content has been one of the difficulties in the treatment of industrial wastewater , and has become an important factor for sustainable development of the affected industries to address wastewater pollution is the top priority of the leather industry . CASS (Cyclic Activated Sludge System) process is a the SBR process of an improved . Has a small footprint , the process is simple , flexible operation , easy programmable and adaptable to changes of water quality and quantity , anti- sludge bulking , simultaneous nitrogen and phosphorus removal , etc. . With the development of electronic and automation technology , CASS process has been widely used in many countries in Europe, America and other urban sewage and industrial wastewater treatment . In this paper, CASS process , hydrolysis acidification process , low temperature sewage treatment as the core content , in order to adopt a the hydrolysis acidification CASS combination process Daqing City, Zhaoyuan leather park sewage treatment works as a research platform. By more than two years of construction projects , system debug and production test to obtain a large number of engineering data and applications experience , and has laid a solid foundation for the application of the sets combined process to treat tannery wastewater . Moreover , the article also the characteristics of China's vast northern region of low water temperature in winter , analyzes the advantages and problems of using the combined process under low temperature conditions , provides effective parameters and design basis for generalized to other industries and fields . For the wastewater quality increasingly complex in today's society , hydrolysis acidification CASS is a very competitiveness and development prospects of a combination of biological wastewater treatment process , is bound to play an increasingly important role in China 's sewage treatment field .
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