CaO2 pretreatment enhances fecal pollution indicator removal during mesophilic anaerobic digestion of sewage sludge

IF 11.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Yuhang Wang, Wenhao Fang, Hua Li, Ru Wang, Xinxin Wang, Xiaomeng Wang, Lixiang Zhou, Guanyu Zheng
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引用次数: 0

Abstract

Municipal sludge retains fecal pathogens that pose challenges in its treatment and utilization. Mesophilic anaerobic digestion (MAD) fails to achieve adequate pathogen reduction while demonstrating inconsistent methane. To address these, the feasibility of reducing fecal pollution indicators, including Escherichia coli (EC), human-specific Bacteroides HF183 (HF183), human adenovirus (HAdV), JC and BK polyomaviruses (JCPyV and BKPyV), and crAssphage by combining MAD with CaO2 pre-treatment was assessed. Both ·OH and ·O2 were produced during CaO2 pre-treatment. ·OH mainly accounted for the removal of these indicators, while ·O2 reduced their infectivity. In MAD process, CaO2 pre-treatment accelerated the decay of most indicators with the elevated ammonia nitrogen in digested sludge. Overall, CaO2 pre-treatment and the MAD process predominantly contributed to the reduction of HF183, JCPyV and HAdV and the reduction of crAssphage, EC, and BKPyV, respectively, and combining MAD with CaO2 pre-treatment is an effective approach for removing fecal indicators from sludge.

Abstract Image

CaO2预处理提高了污泥中温厌氧消化过程中粪便污染指标的去除率
城市污泥中残留的粪便病原体对其处理和利用构成挑战。中温厌氧消化(MAD)未能达到充分的病原体减少,同时显示不一致的甲烷。为了解决这些问题,我们评估了MAD联合CaO2预处理降低粪便污染指标的可行性,包括大肠杆菌(EC)、人类特异性拟杆菌HF183 (HF183)、人腺病毒(HAdV)、JC和BK多瘤病毒(JCPyV和BKPyV)和噬菌体。在CaO2预处理过程中,生成了·OH和·O2−。·OH对这些指标的去除起主要作用,而·O2−则降低了这些指标的感染力。在MAD工艺中,CaO2预处理加速了大部分指标的衰减,并提高了消化污泥中氨氮的含量。综上所示,CaO2预处理和MAD工艺对HF183、JCPyV、hav的减少以及对crasspge、EC、BKPyV的减少贡献最大,MAD与CaO2预处理相结合是去除污泥中粪便指标的有效途径。
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来源期刊
npj Clean Water
npj Clean Water Environmental Science-Water Science and Technology
CiteScore
15.30
自引率
2.60%
发文量
61
审稿时长
5 weeks
期刊介绍: npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.
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