FIELD: utilization of sewage water produced at commercial pig units and farms, may be used in agriculture for treating liquid wastes of commercial pig units and farms for irrigation and fertilization of agricultural lands.
SUBSTANCE: method involves sequentially introducing alkali coagulant - calcium carbide sludge suspension or mixture of lime milk and calcium carbide sludge suspension in the ratio of 1:2 in an amount of 1.0-3.0 g/dm3 on conversion to CaO and acidifying reactant to provide pH value of 6.5-8.5; separating resulted sediment; as acidifying reactant, using phosphoric acid production waste: mixture of suspensions of calcium sulfate dehydrate and common superphosphate in the ratio of 1:1 or mixture of suspensions of calcium sulfate dehydrate and double superphosphate in the ratio of 1:0.5.
EFFECT: provision for producing fertilizer of prolonged effect as to phosphorus oxide.
4 tbl, 6 ex
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