Decay rates of Escherichia coli, Enterococcus spp., F-specific bacteriophage MS2, somatic coliphage and human adenovirus in facultative pond sludge
| Autor: | Yuguo Li, Karen Schwarz, Elliot Lee, Jatinder Sidhu, Yolanta Gruchlik, Deborah Pritchard, Simon Toze |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Stabilization pond Microorganism 0208 environmental biotechnology Human pathogen 02 engineering and technology 010501 environmental sciences Coliphages 01 natural sciences Microbiology Bacteriophage MS2 Escherichia coli Humans Coliphage Ponds Waste Management and Disposal Levivirus 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering Sewage biology Adenoviruses Human Ecological Modeling biology.organism_classification Pollution 020801 environmental engineering Wastewater Facultative lagoon Enterococcus Bacteria |
| Zdroj: | Water Research. 154:62-71 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2019.01.027 |
| Popis: | The purpose of this study was to evaluate the efficacy of a waste stabilization pond (WSP) system to reduce pathogen contaminants in sludge. This included examining the factors that influence the fate and concentration of human pathogens and their indicators in two sludge layers. The decay rates of five study microorganisms were determined under in-situ conditions at a WSP. The background levels of fecal origin microorganisms were consistently detected (ranging: Escherichia coli 104 to 106, enterococci 101 to 103, F-specific bacteriophage (MS2) 101 to 103 and somatic coliphage 101 to 104 colony-forming units (CFU) mL−1, as well as 101 to 102 human adenovirus gene copies mL−1) in the primary facultative pond. Among microorganisms tested, the bacteria generally decayed faster than adenovirus and bacteriophage, particularly in the upper sludge layer. Due to the observed regrowth of E. coli, it may have a limited value as an indicator for pathogen removal in the wastewater stabilization ponds. The abundance of E. coli numbers within the pond biome followed changes in pond temperature over time. The results of the study suggest that viruses could survive for a long time, particularly in deeper layers (>1 metre) in the sludge, during winter months (T90 = 156 d). The presence of human pathogens in WSP sludge, in particular viruses, may be a barrier to its beneficial reuse in agriculture. The results indicate that additional treatment of sludge may be required to mitigate potential public health risks from reuse of sludge for agricultural purposes. |
| Databáze: | OpenAIRE |
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