METHOD OF SEWAGE PREPARATION OF PIG-BREEDING COMPLEXES FOR AGRICULTURAL USE Russian patent published in 2019 - IPC C02F1/52 C02F1/58 

FIELD: agriculture.

SUBSTANCE: invention relates to purification and utilization of waste water, in particular to a method for preparation of waste water of cattle-breeding complexes for agricultural use. Method provides sequential introduction into sewage waters of pig complexes and pig farms for agricultural use of alkaline coagulant – lime milk, or suspension of slurry of calcium carbide, or mixture of lime milk and calcium carbide sludge to pH=10–12, and then sequentially introducing acidifying reagents, such as suspensions of ammophos and nitrofoska with continuous stirring for 2–3 minutes to pH=6.5–8.0 with release of formed precipitate.

EFFECT: invention enables to obtain organomineral fertilizer with high concentrations of biogenic components while considerably simplifying the process of preparing the reagent and reducing the cost of reagent preparation of waste water for agricultural use, increased efficiency of separation into liquid and solid fractions and their agromeliorative value with reduction of settling time, improves physical properties of the obtained solid fraction and reduces content of heavy metals in it, combined action of two acidifying reagents causes a synergetic effect.

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