Studies on the reduction of pathogenic and indicator bacteria in liquid pig manure treated by sedimentation and anaerobic filter digestion for methane generation
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Salmonella typhimurium, Streptococcus faecalis, and enteropathogenic Escherichia coli, which were artificially added to liquid pig manure, and coliforms of the indigenous flora, were reduced by 0·5-2·1 log10 units when subjected to anaerobic filter treatment at 35°C in two pilot-plant reactors. The hydraulic retention times varied between 0·8 and 4·2 days, and reductions decreased with a decrease in this parameter. Reductions apparently followed first-order kinetics. When subjected to separation by gravitation for 24-48 h in small-scale experiments, the liquid fraction of the slurries to be treated by filter digestion contained, on average, up to 0·8 log10 units less of the artificially added bacteria and up to 1·5 log10 units less of coliforms of the indigenous flora. The results of the treatment by anaerobic filter digestion and separation pre-treatment are discussed in comparison with traditional anaerobic digestion at mesophilic temperatures.
Originalsprog | Engelsk |
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Tidsskrift | Biological Wastes |
Vol/bind | 24 |
Udgave nummer | 1 |
Sider (fra-til) | 17-26 |
Antal sider | 10 |
ISSN | 0269-7483 |
DOI | |
Status | Udgivet - 1988 |
ID: 257698729