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| Inactivation of pathogenic microorganisms by alkaline pretreatment and kinetic analysis |
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Abstract The alkaline pretreatment effect for different TS of faecal sludge (8%, 10%, 12%) to inactive the pathogens (fecal coliforms, Salmonella spp., fecal streptococcus, and helminth eggs) and disintegrate the faecal sludge (SCOD and soluble protein) was studied. The resulting microbial inactivation curves were either described by the Weibull or first-order model and goodness fit of two models was investigated. The results showed that when the pH was 10or 12 at the beginning, four kinds of pathogens were completely removed after three days, and the Weibull model exhibited data of pathogen inactivation more efficiently than the first-order model. When the pH was 10, the SCOD of faecal sludge increased 1.84~1.89times, soluble protein increased 8.25~9.39times. When the pH was 12, the SCOD of faecal sludge increased 1.90~1.97times, soluble protein increased 8.62~9.89times.
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Received: 31 March 2014
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