水的质量、空气的质量决定生命的质量人能三天不吃饭,但不可一日无水,水的重要性不言而喻。随着社会经济的飞速发展,水资源的污染程度也日趋严重,部分城市自来水厂落后的净化工艺及自来水管网老化所带来的二次污染,以及广大农村的地下水也受到了化工厂、农药厂及各种工业废水、废气的严重污染,已 The quality of water, air quality determines the quality of life One can not eat for three days, but not one day water, the importance of water is self-evident. With the rapid development of society and economy, the pollution degree of water resources is also becoming more and more serious. The backward purification technology of some urban waterworks and the secondary pollution caused by the aging of water pipe network, as well as the groundwater in vast rural areas, are also affected by chemical plants, pesticides Factories and various industrial waste water, the serious pollution of exhaust gas, has