General business projects: Environmental science and technology research services; Water pollution control; Wastewater treatment and its recycling; Sales of specialized equipment for environmental protection; Sales of environmental protection instruments; Sales of specialized chemicals and materials for environmental pollution treatment (excluding monitored chemicals and hazardous chemicals); Special design services for environmental engineering; Construction of engineering environmental protection facilities; Environmental assessment; Environmental protection monitoring; Ecological monitoring; Indoor environment detection; Water pollution monitoring; Soil and water conservation monitoring; Air pollution monitoring; Noise pollution monitoring; Waste monitoring; Software development; Data processing and storage services; Environmental protection management commodity trade (excluding licensed and approved commodities); Technology import and export; Sales and technical services for membrane treatment agents; Import and export of goods Projects that require permission according to law must obtain permission before they can be operated. Software sales. (Except for projects that require approval according to law, conduct business activities independently based on the business license in accordance with the law); Manufacturing of gas and liquid separation and purification equipment; Sales of gas and liquid separation and purification equipment; Sales of new membrane materials; Research and development of new material technology; Manufacturing of new membrane materials; Manufacturing of ecological environment materials; Sales of ecological environment materials; Research and development of unconventional water source utilization technology. (Except for projects that require approval according to law, business activities can be carried out independently based on the business license) Licensed business projects: specialized equipment for environmental protection, environmental instruments, specialized chemicals for environmental pollution treatment, material manufacturing (excluding monitoring chemicals and hazardous chemicals), and manufacturing of electronic equipment for computer applications; Ordinary freight transportation; Lime production and sales (excluding exclusive and controlled goods); Production of membrane treatment agents.