STUDY RESULTS OF MASS AND NUTRIENT LOSS IN TECHNOLOGIES OF DIFFERENT COMPOSTING RATE: CASE OF BEDDING POULTRY MANURE

Currently increasing attention is paid to intensification of different technologies of farm waste processing, animal and poultry manure in particular. It is the authors' opinion that acceleration of the composting process should not have negative effect on the ready product quality. The aim of the study was to estimate the loss of mass and nitrogen and phosphorous in two intensive composting technologies - bio-fermentation in chamber- and drum-type installations and the open ground passive composting. It was established that the loss of mass in these technologies varies from 15 to 27 %, the loss of total nitrogen varies from 3 to 25 %, that of phosphorous - from 0 to 7 %. The experiments proved the duration of the bio-fermentation process in each studied technology: in chamber bio-fermentor - 7 days, drum bio-fermentor - 3 days, passive composting in piles - 2.5 months in summer time. The methods to reduce the nutrient loss in the studied technologies are offered.