Volume 7, Issue 6 (2-2012)
J Health Syst Res 2012, 7(6): 0-0 |
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رحيم عالِي, مريم حاتمزاده, مهناز نيكآئين. مقایسه روش تخمیر چند لولهای متداول با روش A-1در ارزیابی کیفیت میکروبی لجن دفعی تصفیه خانههای فاضلاب. J Health Syst Res 2012; 7 (6)
URL: http://hsr.mui.ac.ir/article-1-308-en.html
URL: http://hsr.mui.ac.ir/article-1-308-en.html
1- PhD Candidate, Student Research Committee, Department of Environmental Health Engineering, Environment research center, Isfahan University of Medical Science, Isfahan, Iran.
2- BSc, Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Science, Isfahan, Iran.
3- Associate Professor, Department of Environmental Health Engineering, Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
2- BSc, Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Science, Isfahan, Iran.
3- Associate Professor, Department of Environmental Health Engineering, Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
Abstract: (1071 Views)
Background: Despite the obvious benefits of sludge or biosolids in land application as a soil conditioner and fertilizer, there are concerns about its potential hazards. There is a great concern in the world about the disposal of biosolids due to the numerous pathogenic microorganisms, and chemicals, such as heavy metals, present in it. Therefore, microbiological monitoring of sludge by wastewater utilities is essential to assess the efficiency of treatment plants and the land application of sludge. Methods: In this study the A-1 medium was compared with the conventional multiple tube fermentation technique (MTF) for the microbial evaluation of wastewater treatment plant sludge. In this research, 30 biosolids samples were taken from north and south Wastewater Treatment Plants of Isfahan. After measuring the ambient and sample temperature, the samples were transported to the laboratory. Fecal coliforms were analyzed by two methods. Total solids (TS) and volatile solids (VS) were also measured. Findings: The number of fecal coliforms in all samples of the north and south wastewater sludge treatment was higher than the class A and B of biosolids standards. Enumeration of fecal coliforms averaged 3.25E+14 and 2.1E+14 MPN/g by the MTF and A-1, respectively and this difference was statistically significant Conclusion: In conclusion, A-1 medium technique can be used as an alternative approach to the MTF method for microbial monitoring of biosolids with less labor and detecting of fecal coliforms in a shorter amount of time.
Type of Study: Research |
Subject:
education health and promotion
Received: 2020/07/16 | Accepted: 2023/03/4 | Published: 2023/03/4
Received: 2020/07/16 | Accepted: 2023/03/4 | Published: 2023/03/4
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