self-purification definition
Self-purification is the process in which balance restoration of the aquatic environment takes place through simultaneous participation or in some sequence of the physical and chemical factors, biological, hydraulic and morphological characteristics of the river.n time, the development of society, through population growth and development of agriculture and various industries have increased water uses, but used and returned water has not the same quality as that taken prior to use, the water quality and quantity has become a real problem worldwide.