The efficiency of applying the calcium-reagent, suspension of calcium carbide sludge, to destabilize colloid system of high concentrated waste water from livestock farms due to different doses was established. The opportunity of using phosphogypsum as an acid reagent was determined; required reagent dose varies from 35 to 52 g/dm³. The significant decrease of reagent dose is possible when phosphogypsum of orthophosphoric acid adding in suspension in a ratio of 500:1 by volume. Introduction of non-destructive technology of waste water treatment by applying effective coagulants provides the stratification effect of 94 %. As an efficiency index the time for settling was assumed. It is established that this index for the coagulant «Àêâà-ÀóðàòÒÌ30» (“Akva-Aurat-30”) is about 50-60 minutes what is two times less than design time for standard precipitation tank.
Keywords: waste water utilization, reagent, coagulant, phosphogypsum, efficiency of settling.
