Water pollution control; Ecological protection zone management services; Municipal facility management; External contracting projects; Construction of landscaping and greening projects; Engineering management services; Water pollution prevention and control services; Environmental consulting services; Environmental emergency management services; Recycling of renewable resources (excluding productive waste metals); Leasing of construction machinery and equipment; Research and development of resource recycling technology; Manufacturing of general components; General equipment manufacturing (excluding special equipment manufacturing); Mining machinery manufacturing; Manufacturing of sludge treatment equipment; Manufacturing of specialized equipment for environmental protection; Specialized equipment manufacturing (excluding licensed specialized equipment manufacturing); Manufacturing of underwater systems and operational equipment; Manufacturing of specialized instruments and meters for environmental monitoring; Manufacturing of ecological environment materials; Processing of renewable resources; General equipment repair; Specialized equipment repair; Wastewater treatment and its recycling; External contracting projects; External contracting projects; Undertake the engineering construction business of the head office; Sales of specialized equipment for environmental protection; Sales of water transportation equipment; Sales of pipeline transportation equipment; Sales of mining machinery; Sales of construction machinery; Sales of underwater systems and operational equipment; Sales of ecological environment monitoring and detection instruments and meters; Sales of environmental emergency detection instruments and meters; Sales of environmental emergency technical equipment; Sales of specialized instruments and meters for environmental monitoring; Land pipeline transportation; Procurement agency services; Bidding agency services