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Inoculation effect of thermophilic and alkaliphilic bacteria on decomposition rate and odor emission mitigation in pig carcasses composting
3rd Global Microbiologists Annual Meeting
August 15-17, 2016 Portland, Oregon, USA
Woo Young Yang, Yumi Kim, Hee Wook Ryu and Kyung-Suk Cho
Soongsil University, South Korea
Ewha Womans University, South Korea
Posters & Accepted Abstracts: Clin Microbiol
Abstract:
As one of the methods for treating a livestock carcasses infected with foot and mouth disease, the carcasses composting using thermophilic bacteria was studied to decompose rapidly the carcasses and to minimize odor emissions. Twenty eight species of thermophilic (40~60 oC) and alkaliphilic (pH 8~10) bacteria were isolated and assessed their ability to decompose protein and lipid. Among them, five thermophilic and alkaliphilic bacteria (Bacillus sp. AL2, Bacillus sp. APJ4, Bacillus sp. OP3, Geobacillus thermodenitrificans OP4 and Aneurinibacillus thermoaerophilus OP11), which generate less odor in the decomposing process, were selected and applied to composting pig carcasses. The pilot-scale composting cells (2.5�?�?2.5�?�?2.0 m) were constructed and fully fermented pig manure compost was used as a feedstock for the composting carcasses. Six pig carcasses of 90 kg were buried in each cell. Compared with the control cell which not inoculated with the decomposing bacteria, the temperature of the test cell applying the thermophilic bacteria was kept higher by 40 to ~54 oC, the pH of the compost around the burial carcasses was 8.0 to ~9.5. The odors from the decomposition were less released from the cell and the buried carcasses were completely decomposed and remained clean bones after 1 year. It suggests that the use of thermophilic bacteria can quickly decompose the carcass and reduce the generation of odor.
Biography :
Woo Young Yang has completed his graduate studies from Soongsil University and he is currently a Master’s student at Soongsil University, South Korea.
Email: sgyang87@ssu.ac.kr