自然界有很大的净化能力,即自净作用。而人为的净化虽然在理论上、技术上是可能的,但需要支出相当大的费用,占用土地和消耗能量。但是,不管用哪种方法来实现高级处理都是相当困难的。为弥补现有处理方法的不足或提高处理效果,重新评价自然界的净化能力不是 Nature has a great ability to purify, that is self-purification. Although artificial purification is theoretically and technically possible, it requires considerable expenditures, land occupation and energy consumption. However, regardless of the method used to achieve advanced processing is very difficult. To remedy the deficiencies of the existing treatment methods or to improve the treatment effect, reevaluating the purification ability of nature is not