Survival of Salmonella spp. in a simulated acid-phase anaerobic digester treating sewage sludge.
The presence of pathogenic microorganisms in municipal waste sludge may create a serious outbreak of water borne diseases if the sludge is used for agricultural purpose. An attempt to decrease the number of pathogenic microorganisms, Salmonella spp. using a simulated acid-phase anaerobic digester was tested in a laboratory-scale batch experiment. Reduction of Salmonella spp. was demonstrated in a mixture of sludge and organic acid, simulating an acid digester of a two-phase anaerobic digestion process. A high concentration of organic acid at a pH value of 5.5-6.0 prevents a decrease in Salmonella spp. concentration. Almost complete destruction of Salmonella spp. is observed within two days if the pH value is maintained below 5.5.
Fukushi
K
K
Environmental Science Center, The University of Tokyo, Japan. fukushi@esc.u-tokyo.ac.jp
Babel
S
S
Burakrai
S
S
D000693:Anaerobiosis; D006863:Hydrogen-Ion Concentration; D012475:Salmonella / Q000302:isolation & purification* / Q000472:pathogenicity; D012722:Sewage / Q000382:microbiology*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000592:standards
D012722:Sewage