Explain the phases by which treatment of industrial effluents can be done.
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The process involves adsorption of organic compounds in the wastewater by the microbial slime layer, diffusion of air into the slime layer to provide the oxygen required for the biochemical oxidation of the organic compounds. The end products include carbon dioxide gas, water and other products of the oxidation.
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The three phases are:
(i) Primary treatment by mechanical means. This involves screening, grinding,flocculation and sedimentation.
(ii) Secondary treatment by biological process.
(iii) Tertiary treatment by biological, chemical and physical processes. This involves recycling of waste water.
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