Zhejiang Zhengda Environmental Protection Equipment Co., Ltd. is a company integrating technology development, drainage and water supply engineering equipment production. The company has independently designed, built and operated slaughter sewage and protein sewage treatment. Sludge process reduction activated sludge (SPRAS) sewage treatment technology is Zhengda Environmental Protection Developed by Lei Weiwei, Chief Engineer of Equipment Co., Ltd. in 2002, the whole process includes three modules: sludge process reduction, biological nitrogen removal and chemical phosphorus removal. This technology can achieve efficient sewage purification while significantly reducing sludge production, which is expected to change the current operation mode of "sewage treatment+sludge treatment and disposal" and solve the worldwide problem of sludge treatment and disposal that has plagued biological sewage treatment plants for nearly a century. At present, this technology has been applied in four sewage treatment plants with an output of 20000 square meters/day, and the longest one has been running stably for 5 years without sludge discharge. SPRAS technology is a method of process deceleration of handicrafts formed through process innovation. It does not need to add any exogenous sludge deceleration agent, and can be flexibly combined with the activated sludge process (SBR, AAO, inverted AAO, oxidation ditch, etc.) of the sewage treatment plant for new or reconstruction projects to achieve sludge reduction.
In July 2010, Vice Premier Li Keqiang of the State Council attached great importance to this core technology of Zhejiang Zhengda Environmental Protection Equipment Co., Ltd. during his research in Zhejiang. In September 2010, in accordance with the spirit of the important instructions of Vice Premier Li Keqiang, the National Development and Reform Commission organized an investigation team composed of relevant experts from the Ministry of Information and Corruption, the Ministry of Environmental Protection, Tsinghua University and other units to investigate the core technology of Zhejiang Zhengda Environmental Protection Equipment Co., Ltd. in Lishui. In November 2010, the National Development and Reform Commission once again gathered experts from the Ministry of Science and Technology, the Ministry of Housing and Urban Rural Development, and the Chinese Academy of Sciences to hold a symposium on this technology in Beijing to further discuss and urge the demonstration and promotion of this technology. In December 2010, the Provincial Department of Science and Technology appraised the technology. The appraisal committee, with Academician Jin Jianming of the Chinese Academy of Engineering as the director and Yang Xiangping, vice president of the China Urban Water Supply and Drainage Association as the deputy director, believed that the technology "is a new technology for sludge process reduction, which is original and a major breakthrough in the field of sewage sludge treatment."
Compared with the traditional process, SPRAS technology integrates sewage treatment and sludge treatment. It is not only a sewage treatment technology, but also a sludge treatment technology. The biggest advantage is that it can reduce more than 90% of sludge except sand and other inorganic substances while ensuring sewage treatment up to standard, It can be used as a high-tech sludge treatment process in the construction, reconstruction and expansion of sewage treatment plants.
Taking a sewage treatment plant with a capacity of 20000 m3/d as an example, the SPRAS technology and typical Sludge dewatering machine Disposal
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