Reduction and partitioning of viral and bacterial indicators in a UASB reactor followed by high rate algal ponds treating domestic sewage
Reduction and partitioning of viral and bacterial indicators in a UASB reactor followed by high rate algal ponds treating domestic sewage
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DOI：
10.1016/j.scitotenv.2020.144309
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发表时间：
2021-03-15
影响因子：
9.8
通讯作者：
Mota, Cesar Rossas
中科院分区：
文献类型：
--
作者：
Espinosa, Maria Fernanda;Verbyla, Matthew E.;Mota, Cesar Rossas
人类肠道病原体是全球关注的一个主要问题，因为它们每年造成数千例可预防的死亡。废水中新的病原体不断出现。例如，最近在生活污水和初级污泥中发现了SARS-CoV-2。关于在废水处理中减少病毒及其在处理后的液体流出物与污泥或生物固体之间的分配的知识仍然非常匮乏，特别是在新兴经济体和热带气候国家。上流式厌氧污泥毯（UASB）反应器是拉丁美洲和加勒比地区最常用的污水处理技术之一，在许多其他低收入和中等收入国家，它们的使用越来越普遍。高速率藻池（HRAP）被认为是一种可持续的UASB出水后处理技术。本研究在一个由UASB反应器和hrap处理实际废水组成的中试系统中评估了体细胞噬菌体、f特异性噬菌体和大肠杆菌的总体减少和液固分配。在UASB反应器中，体细胞和f特异性噬菌体的平均对数去除率分别为0.40和0.56，在hrap反应器中分别为1.15和1.70。系统中两种噬菌体的总去除率为2.06-log。大肠杆菌的去除率一直较高。在UASB固体和藻类生物量中离开系统的病毒数量不到澄清液体流出物中离开系统的病毒数量的10%。据估计，以固体残留物形式离开系统的大肠杆菌数量大约比液体流出物中的大肠杆菌数量高一个数量级。本研究的结果证明了UASB-HRAP系统在减少生活污水中的病毒和细菌指标方面的适用性，以及在将污泥用作生物固体之前对其进行充分处理以减少病原体的重要性。(C) 2020 Elsevier B.V.版权所有
Human enteric pathogens are a major global concern, as they are responsible for thousands of preventable deaths every year. New pathogens in wastewater are constantly emerging. For example, SARS-CoV-2 has been recently detected in domestic sewage and primary sludge. Knowledge about the reduction of viruses in wastewater treatment and their partitioning between the treated liquid effluent versus the sludge or biosolids is still very scarce, especially in countries with emerging economies and tropical climates. Upflow anaerobic sludge blanket (UASB) reactors are among the top three most commonly used technologies for the treatment of sewage in Latin America and the Caribbean, and their use has become increasingly common in many other low- and middle-income countries. High-rate algal ponds (HRAP) are regarded as a sustainable technology for the post-treatment of UASB effluent. This study evaluated the overall reduction and the liquid-solid partitioning of somatic coliphages, F-specific coliphages, and E. coli in a pilot-scale system comprised of a UASB reactor followed by HRAPs treating real wastewater. Average log removal for somatic and F-specific coliphages were 0.40 and 0.56 for the UASB reactor, and 1.15 and 1.70 for HRAPs, respectively. The overall removal of both phages in the system was 2.06-log. Removal of E. coli was consistently higher. The number of viruses leaving the system in the UASB solids and algal biomass was less than 10% of the number leaving in the clarified liquid effluent. The number of E. coli leaving the system in solids residuals was estimated to be approximately one order of magnitude higher than the number of E. coli leaving in the liquid effluent. Results from this study demonstrate the suitability of UASB-HRAP systems to reduce viral and bacterial indicators from domestic sewage and the importance of adequately treating sludge for pathogen reduction before they are used as biosolids. (C) 2020 Elsevier B.V. All rights reserved.