Improvement of methods of regeneration of litter for reuse

Abstract

Goal. To develop and investigate improved methods for regenerating used bird litter. Methods. Zootechnical, zoohygienic, and statistical. The research of the improved ways of regeneration of the used bird litter is developed and carried out, in particular: covering of a pile in the course of biothermal processing by a film; an addition to the litter of a special microbiological preparation Bioseven (Vetolak) produced by PE «BTU-Tsentr»; irradiation of the pile surface with ultraviolet bactericidal radiation; ozonation indoors. The dynamics of litter temperature and humidity, ammonia emission in the process of its biothermal treatment, the influence of biothermal treatment on microbial contamination, and the chemical composition of litter have been studied. Results. Pre-treatment of the used bird litter with microbiological preparation provided intensification of the process of biothermal treatment and increase of temperature by 1–7°C (P<0,01), which created better conditions for its disinfection. The use of microbiological preparation, as well as ozonation in the room and irradiation of the litter surface with ultraviolet bactericidal radiation, helped to reduce ammonia emissions, respectively, by 1–27, 1–23, and 1–16 mg/m2 for 1 h (P<0,05). After biothermal treatment, the nitrogen content in the litter decreased by 10–17%. Slightly higher nitrogen content after treatment (by 0.2%) was in the litter, which before treatment in the piles was treated with a microbiological preparation. Biothermal treatment of litter in the process of regeneration ensured the reduction of its contamination with enterobacteria by 0.5–1.1 log10, fungi — 2–5 times. Conclusions. The developed methods of regeneration of used poultry litter help to intensify the process of its biothermal treatment, reduce contamination by enterobacteria by 0.5–1.1 log10, fungi — 2–5 times, ammonia emissions — by 1–27 mg/m2 in 1 hour.