The elimination of Salmonella typhimurium in sewage sludge by aerobic mesophilic stabilization and lime hydrated stabilization

This study observed the effects of two methods, aerobic mesophilic stabilization and lime hydrated stabilization of sewage sludge upon the survival of Salmonella typhimurium. Raw (primary) sludges from the mechanical biological municipal sewage treatment plant were used. Aerobic stabilization and li...

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Bibliographic Details
Published in:Bioresource technology 2008-07, Vol.99 (10), p.4269-4274
Main Authors: PLACHA, Iveta, VENGLOVSKY, Jan, MAKOVA, Zuzana, MARTINEZ, José
Format: Article
Language:English
Subjects:
Aerobic mesophilic stabilization
Aerobiosis
Applied sciences
Biodegradation, Environmental
Biological and medical sciences
Bioreactors
Biotechnology - methods
Calcium Compounds - analysis
Cultures
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Hydrogen-Ion Concentration
Industrial Waste
Lime hydrated stabilization
Metals, Heavy
Models, Statistical
Municipal sludges
Oxides - analysis
Pollution
Refuse Disposal
Salmonella typhimurium
Salmonella typhimurium - metabolism
Sewage
Waste Disposal, Fluid
Wastes
Wastewater treatment plant
Wastewaters
Water Pollutants, Chemical - analysis
Water Purification - methods
Water treatment and pollution
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Summary:This study observed the effects of two methods, aerobic mesophilic stabilization and lime hydrated stabilization of sewage sludge upon the survival of Salmonella typhimurium. Raw (primary) sludges from the mechanical biological municipal sewage treatment plant were used. Aerobic stabilization and lime hydrated stabilization were carried out in a laboratory fermentor. Aerobic stabilization was carried out in the mesophilic temperature range (from 25.70 ± 0.40 to 37.82 ± 1.38 °C). Lime hydrated was used at an amount of 10 kg/m 3 for the stabilization. Sludge samples were inoculated with a broth culture of S. typhimurium. Quantitative and qualitative examinations of the presence of S. typhimurium were carried out. Aerobic mesophilic stabilization caused elimination S. typhimurium within 48 h. The T 90 value of S. typhimurium was 6.66 ± 0.20 h. During the lime hydrated stabilization pH values significantly increased from 5.66 ± 0.07 to 12.12 ± 0.02 ( P < 0.01). S. typhimurium was inactivated within 1 h and the T 90 value was 0.19 ± 0.01 h. Our study confirmed that the treatment of sewage sludge with lime hydrated was significantly more effective than the aerobic mesophilic stabilization, ( P < 0.01).
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2007.08.056