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“Dongcheng Ecological Environment Lecture Hall” entered Beijing No. 27 Middle School

  The activity closely followed the theme of "World Day to Combat Desertification and Drought" and enhanced students' understanding of desertification and drought, and thus promoting the importance of water conservation. Dr. Han Jiayi, a researcher from the Water Quality Safety Monitoring Office of the Environmental Control Center of China CDC, first explained the causes and hazards of desertification and drought, and then enabled students to form a scientific understanding of water through water electrolyte testing, residual chlorine detection, conductivity testing and other demonstration experiments. At the same time, he made listeners know how to save water in daily life and understand the importance of "water saving" and other green living habits from the four parts of water and life, water and daily life, water-saving techniques and popular science knowledge. The students in the four sub-venues participated in the water quality testing and the water filtration tests respectively. Students experienced filtration process of the water by the surface substances by personally testing the water quality, assembling the water purifying device, carrying out the water purification experiment thorough simulated small water purification plants. They finally felt how difficult it was to get "clean water", so that they will build up consciousness on saving water and practice green lifestyle.