Hangzhou Guotai Environmental Protection Technology Co.,Ltd. engages in the sludge treatment and recycling business in China. It operates through three segments: Sludge Treatment Services, Sales of Complete Equipment, and Ecological Restoration of the Water Environment. The Sludge Treatment Services segment focuses on the treatment, disposal, and resource utilization of sludge from sewage treatment plants, utilizing proprietary deep dehydration technology to convert sludge into fuel for power generation or cement production, thus enabling closed-loop disposal and resource recycling. The Sales of Complete Equipment segment offers customized environmental protection equipment, including sludge treatment systems, volatile organic compound (VOC) treatment units, solvent recovery systems, and resource recovery equipment for the lithium battery, new materials, and chemical industries, as well as advanced oxidation wastewater treatment systems. The Ecological Restoration of Water Environment segment provides river and lake sediment pollution control, water diversion and purification, and ecosystem circulation purification technologies aimed at water quality improvement and ecological restoration. The company also engages in the research and development of high-salinity wastewater treatment and green synthesis of battery materials. The company was founded in 2001 and is based in Hangzhou, China.