Hangzhou Guotai Environmental Protection Technology Co., Ltd., together with its subsidiaries, engages in the research, development, production, and sale of environmental protection technologies in China. The company 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. It is involved in the treatment, disposal, and resource utilization of sludge from wastewater treatment plants, as well as wastewater treatment quality improvement and efficiency enhancement services; separation and purification of mixed organic solvents and organic solid waste, purification and refining of inorganic salts, resource utilization of metals, and provision of technical support for green transformation, as well as resource recycling and elemental and molecular utilization; and waste heat recovery and recycling equipment for lithium battery production process. The company was founded in 2001 and is headquartered in Hangzhou, China.