tailieunhanh - Ebook English for Environmental technology: Part 2

Nối tiếp nội dung phần 1, phần 2 cuốn sách trình bày các bài học từ bài 6 bao gồm: Water pollution, wastewater treatment, solid wastes, solid waste management, sustainable development. nội dung chi tiết. | Đóng góp PDF bời GV. Nguyền Thanh Tú WATER POLLUTION Look at the pictures and discuss in groups to answer the questions below. Note down your ideas. 1. What do think water pollution is 2. Is water pollution a serious problem nowadays Why 3. What effects of water pollution do you think of 4. What sources ot water pollution do you think on 58 Đóng góp PDF bòi GV. Nguyền Thanh Tú READING Water pollution is the phenomenon when natural water bodies arc contaminated by chemical physical radioactive or pathogenic microbial substances. It occurs when pollutants arc directly or indirectly discharged into water bodies without adequate treatment to remove harmfill compounds. It is a major global problem which requires ongoing evaluation and revision of water resource policy at all levels international down M individual aquifers and wells . It has been suggested that it is the leading worldwide cause of deaths and diseases and that it accounts for the deaths of more than 14 000 people daily. Developing and developed countries continue to struggle with the acute problems of water pollution as well. In the most recent national report on water quality in the United States 45 of assessed stream miles 47 of assessed lake acres 32 of assessed bays and estuarine square miles were classified as polluted. Around 90 the water in the cities of China is polluted and as of 2007 half a billion Chinese had no access v safe drinking water. An estimated of 580 people in India die of water pollution related illness every day. CATEGORIES Point sources Point sources of water pollution are described by the CWA as any discernible confined and discrete conveyance from which pollutants are or may be discharged These include pipes or man-made ditches from stationary locations such as sewage treatment plants .