title: [Effect of substrate concentration on pathogen indicators inactivation during thermophilic anaerobic digestion].
abstract: Because excess sludge contains high density of pathogens, it has to be treated to reduce pathogens before being disposed for land application. In this study, the effect of substrate concentration on pathogen inactivation during thermophilic anaerobic digestion was investigated. The results show that, with the increase of substrate concentration, VFAs and cumulative methane production increased. The density of total coliforms in the suspension liquid has a 2.0-3.0 orders of magnitude decline and fecal coliforms has 1.8-3.3 orders of magnitude decline after 28 days thermophilic anaerobic digestion at substrate concentration of 28-84 g x L(-1) and temperature of 55 degrees C. More than 99% of total coliforms and fecal coliforms have been killed after 28 days digestion. Salmonella spp. was not detected in the suspension and solid after anaerobic digestion. When substrate concentration was higher than 45 g x L(-1), the inactivation of total coliforms and fecal coliforms declined.
authors.forename: Hong-Qing
authors.initials: HQ
authors.lastname: Cao
authors.forename: Fei-Fei
authors.initials: FF
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.forename: Zi-Lin
authors.initials: ZL
authors.lastname: Tong
authors.forename: Zhen-Hu
authors.initials: ZH
authors.lastname: Hu
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D004755:Enterobacteriaceae / Q000302:isolation & purification; D005243:Feces / Q000382:microbiology; D006358:Hot Temperature; D008697:Methane / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D012475:Salmonella / Q000302:isolation & purification; D012722:Sewage / Q000382:microbiology*
chemical_list: D012722:Sewage; D008697:Methane