Food industrial wastes from various industries contains substances which, due to their corrosive or toxic effects, cause damage to the sewage network, adversely affect the central sewagepurificationplants, reduce the self-purification of rivers and have an unfavorable effect upon the living conditions for the organisms in these waters. These substances (i.e., alkalis, acids, chlorides, solids and salts) contained in the industrial effluents can be removed by physical, biological and chemical

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... ns or at least their concentrations reduced to an acceptable level.