Hou Guiguang, a senior engineer at the Solid Waste and Chemicals Management Technology Center of the Ministry of Ecology and Environment, serves as the director of the Heavy Metals Department. He has long been engaged in research on planning policies, laws and regulations, and engineering technologies in the field of solid waste. He has presided over and undertaken more than 70 research projects at the national, provincial and ministerial levels, as well as international cooperation projects. He has also presided over and participated in the formulation of several five - year plans, the formulation and revision of national environmental protection standards, and the formulation and revision of laws and regulations. He has completed more than 100 engineering technology consultations and evaluations, published more than 50 papers, participated in the compilation of 12 books, and won 5 provincial and ministerial - level science and technology awards. He is a technical expert in multiple national ministries and fields.