EVPP 108 Lecture Notes - Lecture 6: Radionuclide, Coprecipitation, Sorption
23 Aug 2016
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Document Summary
Pollution can be reduced or removed in concentration with time and increase in the distance travelled. The self purification process consists of: microbial decomposition, chemical precipitation and co-precipitation, sorption, exchange of gases, mechanical filtration, dilution, radioactive decay. The velocity of the flow is 1 m/day to few m/day: fissured rocks. The velocity of the flow is 0. 3 m/day to 26 m/day: microbial decomposition (how micro-organisms purify ground water?, biochemical degradation of organic and inorganic pollutants are carried out by micro- organisms. When the pollution level increases, the degradation process also increases due to availability of more nutrients to micro-organisms. The motile and immotile organisms form microbial slimes on the surface of the ground particles. Now the bacteria and virus that accompany the waste can not survive. It is a measure of the tendency of a system to under go change (oxidation/reduction) When eh is +ve strong oxidising conditions exist.
