Behaviour of pathogenic E. coli and Salmonella enteritidis in small domestic sewage treatment apparatus ("Johkasou").
"Johkasou" is a small sewage treatment apparatus commonly used in Japan which can effectively treat domestic wastewater in places where a public sewage system is difficult to supply. The behaviour of enterohaemorrhagic E. coli O157 and Salmonella enteritidis in a "Johkasou" was studied. Their reduction rates depended significantly on the water temperature in the "Johkasou" with minimal decrease in numbers at 10 degrees C within 48 h. The reduction rates increased at 20 degrees C and 30 degrees C where 4 log reduction could be expected. The reduction rates were influenced by the BOD of the solutions that contained the pathogens with the lower the BOD the higher the reduction rate. The reduction rates were about the same between both pathogens. The result showed that it was necessary to disinfect the effluent as some pathogens can pass through the apparatus when some users of the apparatus excrete pathogens.
Kaneko
M
M
Dept of Industrial and Systems Engineering, Setsunan University, 17-8 Ikedanakamachi, Neyagawa, Osaka 572-8508 Japan. kaneko@ise.setsunan.ac.jp
Nambu
T
T
Tokoro
M
M
D004926:Escherichia coli; D010100:Oxygen / Q000378:metabolism; D011157:Population Dynamics; D012477:Salmonella enteritidis; D012722:Sewage / Q000382:microbiology*; D016019:Survival Analysis; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification; D014881:Water Supply
D012722:Sewage; D010100:Oxygen