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Microbiological quality of sewage sludge after digestion treatment: A pilot scale case of study
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2020-01-11 , DOI: 10.1016/j.jclepro.2020.120101
Andrea López , Jorge Rodríguez-Chueca , Rosa Mosteo , Jairo Gómez , Maria P. Ormad

In the frame of the water circular economy, the reuse of the treated sewage sludge supposes a good action. Nevertheless, the reuse might suppose a human health risk because of the presence of pathogen germs, concentrated in the generated sludge during urban wastewater treatment. For this reason, sludge treatments, conventional or advanced, should be focused on the reduction of fermentation capacity and microorganisms presence. This research assess the microbiological quality of the treated sludge, based on the use of faecal pollution indicators such as total coliforms, Escherichia coli, Enterococcus sp., Pseudomonas sp.¸ Staphylococcus aureus and total mesophilic bacteria, after the application of different digestion treatments, and their final aptitude to be reused. Three different pilot scale plants were used: two anaerobic digestion plants with a volume of 2.75 m3 working in mesophilic (35-37 °C) and thermophilic (55-57 °C) conditions, and hydraulic retention times (HRT) ranging from 5 to 20 days; and a autothermal thermophilic aerobic digestion plant (ATAD) with a volume of treatment of 3.9 m3 working at 55-57 °C for an HRT of 5–15 days. The raw sludge to be treated came from a full-operative WWTP located in the region of Navarra (Spain), laid within Ebro River Basin. It was concluded that both treatments studied obeyed the current European legislation in therms of E. coli concentration and absence of Salmonella spp., being available for agricultural purposes. Considering other microbiological parameters, the anaerobic thermophilic treatment had the best conditions to reduce the Enterococcus sp. concentrations and the aerobic thermophilic treatment was the best one reducing E. coli, being non-significant the influence of HRT to microbial reduction. For this reason, it is strongly recommended the use of both faecal indicators to assess the microbial quality of the treated sludge.



中文翻译:

消化处理后污泥的微生物质量:中试规模的案例研究

在水循环经济的框架内,处理过的污水污泥的再利用被认为是一个很好的行动。但是,由于存在病原菌,这些再利用可能会给人类健康带来风险,这些病原菌集中在城市废水处理过程中产生的污泥中。因此,常规或高级污泥处理应着重于降低发酵能力和减少微生物的存在。这项研究基于粪便污染指标(例如大肠菌群,大肠杆菌肠球菌假单胞菌)的粪便污染指标,评估了处理后的污泥的微生物质量。¸金黄色葡萄球菌和总的嗜温细菌,经过不同的消化处理后,它们的最终适应性得以重用。使用了三种不同的中试规模的装置:两个在中温(35-37°C)和嗜热(55-57°C)条件下工作的2.75 m 3厌氧消化厂,水力停留时间(HRT)为5至20天;以及一个自动处理的高温好氧消化装置(ATAD),处理量为3.9 m 3,工作温度为55-57°C,HRT为5-15天。待处理的原始污泥来自位于纳瓦拉(西班牙)埃布罗河流域内的一个全面运行的污水处理厂。得出的结论是,所研究的两种治疗方法均符合欧洲目前对大肠杆菌的要求。沙门氏菌属浓度较高且没有沙门氏菌,可用于农业目的。考虑其他微生物参数,厌氧嗜热处理具有减少肠球菌sp。的最佳条件。浓度和好氧高温处理是最好的还原性大肠杆菌,对微生物还原的影响不显着。因此,强烈建议同时使用两种粪便指标来评估处理后污泥的微生物质量。

更新日期:2020-01-13
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