Date of Award
Master of Science
Biosystems Engineering Technology
Shawn A. Hawkins
Jennifer M. DeBruyn, Nourredine Abdoulmoumine, Forbes Walker
Poultry litter is a key factor that effects broiler ( meat chicken production because it can harbor pathogenic bacteria . Windrowing, which is akin to in house composting can improve poultry litter quality and limit pathogen growth by heating and drying the litter between flocks. Generally, broiler producers manage windrowing to reach high peak temperature s as fast as possible, to reach efficiently pathogen control standards Biochar, a carbon rich byproduct of biomass energy production, has the potential to improve windrow heating performance by facilitating higher peak temperature and heating rate . In this study, two sources of biochar as litter amendment prior to windrowing Proton Power biochar and City of Lebanon biochar. Pathogen control standards were 122 ℉ for 24h or 145℉ for 1h , under these standards the pathogens in litter can be destroyed . For the farm scale part of this study windrow heating performance was monitor ed in two paired commercial broiler houses one that received 4000 lbs ( 1815 kg, dry weight, about 1% of litter in house) versus a control house that did not receive biochar. There was no significant difference in the peak temperatures attained during wind rowing in the control and biochar amendment houses. For all treatments, the litter at mid depth and floor positions of the windrow can reached ≥122 ℉ for 24h , in the Turn 1 and Turn 2 only the mid depth position can reach ed ≥145 ℉ for 1h at mid depth , in the Turn1 and Turn 2 The surface position had poor heating performance, did not reach either standard s . In the second part of the study, a bench scale experiment was performed to evaluate the effectiveness of two biochars in simulative windrow heating at 1%, 5%, and 10% dry mass based) amendment rate s. In this experiment, the litter moisture was adjusted to 36% during the second simulative windrow turn. Compared to the non biochar added control, the biochar again showed no improvement of heating performance . However, the added moisture significantly improved windrow heating in second simulative windrow turn. T he bench scale study also illustrated that moisture is a key determinative factor in windrow heating performance.
Wang, Daihan, "Biochar amendment and moisture effects on poultry litter windrow heating performance. " Master's Thesis, University of Tennessee, 2019.