Abstract
The fate of indicator bacteria, a bacterial pathogen, and total aerobic bacteria during aerobic and anaerobic digestion of wastewater sludge under laboratory conditions was determined. Correlation coefficients were calculated between physical and chemical parameters (temperature, dissolved oxygen, pH, total solids, and volatile solids) and either the daily change in bacterial numbers or the percentage of bacteria in the supernatant. The major factor influencing survival of Salmonella typhimurium and indicator bacteria during aerobic digestion was the temperature of sludge digestion. At 28 degrees C with greater than 4 mg of dissolved oxygen per liter, the daily change in numbers of these bacteria was approximately -1.0 log10/ml. At 6 degrees C, the daily change was less than -0.3 log10/ml. Most of the bacteria were associated with the sludge flocs during aerobic digestion of sludge at 28 degrees C with greater than 2.4 mg of dissolved oxygen per liter. Lowering the temperature or the amount of dissolved oxygen decreased the fraction of bacteria associated with the flocs and increased the fraction found in the supernatant.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
Reference23 articles.
1. American Public Health Association. 1975. Standard methods for the examination of water and wastewater 14th ed. American Public Health Association Inc. New York.
2. Destruction by anaerobic mesophilic and thermophilic digestion of viruses and indicator bacteria indigenous to domestic sludges;Berg G.;Appl. Environ. Microbiol.,1980
3. Inactivation of viruses during anaerobic digestion;Bertucci J. J.;J. Water Pollut. Control Fed.,1977
4. Bitton G. 1980. Adsorption of viruses to surfaces: technological and ecological implications p. 439. In G. Bitton and K. C. Marshall (ed.) Adsorption of microorganisms to surfaces. John Wiley & Sons Inc. New York.
5. Viral aspects of sludge application to land;Bitton G.;ASM News,1980
Cited by
17 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献