Environmental system engineering environmental system optimization environmental system simulation environmental planning environmental pollution control engineering 3S technology optimization design, management and operation, virtual reality technology ecological system engineering renovation and disaster prevention and mitigation mountain rivers and lakes virtual city planning solid waste treatment and resource treatment and disposal of urban domestic waste technology domestic waste classification technology waste plastic refining technology waste composting technology biosurfactant research belongs to the research of identifying clean production technology, pollution-free arsenic extraction technology, copper tailings utilization technology, air pollution control engineering, new technology of dephosphorization and odor control technology. Horizontal reciprocating grate technology, boiling combustion device, SCX series dust removal and desulfurization device (200 units are popularized and applied), water pollution control engineering, physical chemistry and biological treatment of refractory organic matter, biological denitrification technology for high-concentration organic wastewater treatment, separation and removal of denitrifying microorganisms, species identification of lake environmental capacity, comprehensive prevention and control of lake eutrophication, application of chemical and biosensor in environmental monitoring and analysis, and environmental ecological research on ecological impact of toxic substances.