Total emission control of water pollutants is based on natural water dilution of pollutants and autopurification theory,in another word,natural water has some environmental capacity on pollutants.

• 水污染物的总量控制是建立在天然水体对污染物具有稀释扩散和自净作用理论上,即天然水体对污染物具有一定环境容量的基础上。