由于山溪与河流的水文和地质条件不同,所以它们对有机污染物的自净作用机理也很不一样。本文用实例说明,山溪是依靠河床表面上的生物膜通过生物接触氧化进行自净的。其自净能力较强。 Because the hydrological and geological conditions of mountain streams and rivers are different, their self-cleaning mechanism for organic pollutants is also very different. This article uses an example to illustrate that mountain brook is self-purified by biological contact oxidation on the biofilm on the surface of the riverbed. Its self-cleaning ability is strong.