Purpose: to study the effect of reaсtant treatment of livestock wastewater on the concentration and composition of gas emissions, their dispersion in atmosphere and the formation of a calculated sanitary protection zone. Materials and Methods. The experiment was carried out under laboratory conditions. Three flasks were studied: livestock wastewater (stage A), livestock wastewater pretreated with lime milk at a dose of 1.5 g/dm³ and a mixture of a suspension of phosphogypsum and orthophosphoric acid at a dose of 9.8 g/dm³ (stage B), and livestock effluents treated with burnt defecate with a dose of 0.1 g/dm³ (stage C). Results and Discussions. On the basis of the experimental results obtained, it can be concluded that after treatment with a fired defecate, a deodorization effect is observed, in particular, the concentration of pollutants decreases. For example, the concentration of ammonia and hydrogen sulfide decreased by an average of 75–80 %, and that of methyl mercaptans and sulfur dioxide by 80–90 %, which made it possible to reduce the estimated sanitary protection zone of the pig breeding farm by 2 times. Conclusions. Physicochemical preparation of livestock effluents (treatment with lime milk and a suspension of phosphogypsum, burnt defecate) and the installation of lateral exhausts at treatment facilities made it possible to reduce the sanitary protection zone of the pig-breeding farm from 3350 to 1600 m.