Hangzhou Guotai Environmental Protection Technology Co., Ltd. is a Chinese company engaged in the research, development, production, and sale of environmental protection technologies. It operates through three segments: Sludge Treatment and Wastewater Treatment Quality Improvement Services; Industrial Carbon Reduction and Environmental Protection Equipment and Services; and Battery Material Recycling and Green Production. Its activities include sludge treatment, disposal, and resource utilization, wastewater treatment quality improvement, separation and purification of mixed organic solvents and organic solid waste, purification and refining of inorganic salts, metal resource utilization, and waste heat recovery equipment for lithium battery production. The company was founded in 2001 and is headquartered in Hangzhou, China.