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Microbiological studies of an anaerobic baffled reactor: microbial community characterisation and deactivation of health-related indicator bacteria

机译:厌氧折流板反应器的微生物学研究:微生物群落表征和健康相关指示菌的失活

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摘要

This WRC funded project has studied the appropriateness of the ABR (anaerobic baffled reactor) for on-site primary sanitation in low-income communities. A 3,000 L pilot reactor was located at the Kingsburgh wastewater treatment plant south of Durban, South Africa. Feed to the reactor was raw domestic wastewater containing a significant proportion of particulate organic matter. The compartments of the ABR were routinely monitored for pH, COD, and gas production, among other physical-chemical determinants. The microbial population in each compartment was analysed by fluorescent in situ hybridisation, using general oligonucleotide probes for eubacteria and archeae and a suite of 10 genera or family specific probes. Scanning electron microscopy was conducted on the sludge fraction of each compartment. Mixed fractions from each compartment were also analysed for health-related indicator bacteria (total coliforms and E coli). Results indicated that methanogenesis was not occurring to the expected extent in the latter compartments, and that this was probably due to a hydraulic load limitation. This contrasted with earlier studies on industrial effluent, for which the organic load was exclusively in soluble form. Inactivation of health-related indicator bacteria was less than 1 log, indicating the need for an additional post-treatment of the effluent to protect community health.
机译:该WRC资助的项目研究了ABR(厌氧折流板反应器)对于低收入社区现场初级卫生的适用性。一个3,000升的中试反应堆位于南非德班以南的金斯堡废水处理厂。进料到反应器的是生活污水,其中含有大量的颗粒有机物。除其他物理化学决定因素外,还常规监控ABR的隔室的pH,COD和气体产生。使用普通的用于真细菌和古细菌的寡核苷酸探针以及一组10属或家族特异性探针,通过荧光原位杂交分析每个区室中的微生物种群。对每个隔室的污泥部分进行扫描电子显微镜检查。还分析了来自每个隔室的混合级分中与健康相关的指示细菌(总大肠菌群和大肠杆菌)。结果表明,在后面的隔室中未发生预期程度的产甲烷作用,这可能是由于水力负荷限制所致。这与较早的工业废水研究相反,在工业废水中,有机负荷仅以可溶形式存在。与健康相关的指示菌的失活小于1 log,这表明需要对废水进行额外的后处理以保护社区健康。

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