Aspects of thermal utilization of organic poultry waste

Abstract

Relevance. Currently, poultry farming, as part of the agro-industrial complex, is showing strong growth, which leads to an increase in the generation of organic waste. Chicken manure is a problematic organic waste from poultry farming in terms of its quantity, environmental hazard and moisture content. On the other hand, chicken manure is a potential renewable source of phosphorus. The use of chicken manure as a technogenic deposit of phosphorus will improve the level of environmental and food security. Aim. Research of influence of parameters of plasma and pyrolysis treatment of chicken manure on waste weight loss and phosphorus content in biochar. Methods. Experimental studies of the treatment of chicken manure with microwave plasma and induction pyrolysis; determination of the mass fraction of moisture during drying and loss of waste mass during disposal by the gravimetric method; determination of phosphorus in biochar using the Denizhe colorimetric method modified by A. Malyugin and S. Khrenova. Results and conclusions. The author has carried out the experimental studies on the treatment of chicken manure with microwave plasma and induction pyrolysis. It was shown that effective ways to reduce the mass of chicken manure and prevent environmental pollution are the treatment of manure with microwave plasma and its induction pyrolysis. It was established that when chicken manure is processed in microwave plasma in an inert environment at temperatures up to 1560°C, the mass of waste is reduced by 92.76% with an exposure duration of 7 minutes. At the same time, the content of P2O5 in biochar is up to 52.2 g/100 g of biochar. Further exposure to plasma leads to vitrification of the waste. As the time of treatment of chicken manure with microwave plasma increases, the loss of waste mass grows exponentially. Induction pyrolysis of chicken manure in an inert environment at a temperature of 1000°C makes it possible to reduce the mass of waste by 92.30%. P2O5 content in biochar grows with increasing pyrolysis temperature and amounts to 12.64 g/100 g of biochar. Biochar obtained by treating chicken manure with microwave plasma and induction pyrolysis can be considered as a source of phosphorus. The results obtained indicate the possibility of utilizing chicken manure using microwave plasma and induction pyrolysis.