Primary Treatment of Effluents, Anaerobic Digestion, Lagoons, Anaerobic Treatment, Adoption, Biomethane Gas, Methane

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	Primary Treatment of Effluents -Anaerobic digestion of effluents in lagoons reduces B.O.D to an extent of 80-90%. This process has advantages of relatively low capital investment and ease of adoption and operation, but requires large area of land for lagoons.
Therefore anaerobic treatment in closed digestor involving generation of biomethane gas is more suitable (methane can also be used as a fuel for domestic and industrial uses). However, concentration and incineration requires high capital investment, so that this may not be techno economically viable under Indian conditions. By primary treatment, BOD is brought down to 5,000-10,000 ppm, which is still too high for disposal, keeping the standards fixed (100 ppm for land and 30 ppm for water).