METHOD OF PREPARATION 0F WASTE WATERS FOR AGRICULTURAL USAGE Russian patent published in 2005 - IPC

FIELD: agriculture; pig-breeding farms and complexes.

SUBSTANCE: the invention is pertaining to utilization of waste waters and may be used in agriculture for preparation of liquid wastes of pig-breeding farms and complexes for irrigation and nourishing of agricultural lands. The method of the waste waters preparation of for agricultural utilization includes injection of an alkaline coagulant up to pH = 10-12, then injection of an acidating agent up to pH = 6.5-8.5, and after that - glauconite in amount of 5-20 % from the volume of the treated liquid with the subsequent separation of a forming sediment. In the capacity of an alkaline coagulant use a waste product of acetylene production - suspension of a slime of calcium carbide or a mixture of the lime milk and suspension of a slime of a calcium carbide in the specific ratio at continuous stirring during 2-5 minutes. In the capacity of acidating agent is used suspension of simple or double superphosphate. The method ensures a decreased cost of the waste waters reactant preparation for agricultural utilization, improved efficiency of fractions separation and their land-improvement value at reduction of time of sedimentation, improvement of physical properties of the produced solid fraction and a decreased share of heavy metals in it.

EFFECT: the invention ensures a decreased cost of the waste waters reactant preparation, improved efficiency of fractions separation and their value in land-improvement.

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