全国污水排放量正在以8％的年增长率上升,按此速度推算,到本世纪末,全国污水总排放量将从现在的每天1亿吨增至每天4亿吨以上,水域环境将遭到严重的污染,给渔业生产和人民生活带来严重的威胁。山东微山湖附近的3130家企业日排进湖内污水量达68万吨,含有害物质20多种,入湖污染物每天都在30吨以上。沿湖有的 The national sewage discharge is rising at an annual rate of 8%. Based on this calculation, by the end of this century, the total discharge of sewage in the country will increase from the present daily output of 100 million tons to over 400 million tons per day, and the water environment will be seriously affected Of the pollution, to fishery production and people’s lives pose a serious threat. 3130 enterprises near Shandong Weishan Lake discharged 680,000 tons of sewage into the lake every day, containing more than 20 kinds of harmful substances and more than 30 tons of pollutants into the lake every day. There are some along the lake