水是人类社会赖以生存和发展的宝贵自然资源。多年来,由于世界各国经济不断发展,城市人口急剧增加,工业和生活用水增多,大量的生产和生活污水排入江河、湖泊及渗入地下,导致众多水源遭受污染,许多地区严重缺水,直接威胁到当地人们的生活和健康。保护生态,保护水资源,已刻不容缓。目前,世界各国政府正逐步采取有 Water is a precious natural resource on which human society depends for its existence and development. Over the years, due to the continuous economic development in various countries in the world, the urban population has risen sharply, and the consumption of industrial and domestic water has increased. Large quantities of production and domestic sewage have been discharged into rivers and lakes and infiltration into the ground, leading to pollution of many water sources. To the local people’s life and health. Protection of ecology, protection of water resources, has been urgent. At present, all the governments in the world are gradually adopting it