Conditioning treatments mitigate the levels of fecal pollution indicators in soil during land-application of sewage sludge

IF 4.4 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Science China Technological Sciences Pub Date : 2024-09-13 DOI:10.1007/s11431-024-2706-8
YuHang Wang, Hua Li, WenHao Fang, Ru Wang, XinXin Wang, GuanYu Zheng, LiXiang Zhou
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Abstract

Sewage sludge is a major source of fecal pathogens in the environment, and its application to land can result in a significant release of these pathogens into the soil. While conditioning treatments are crucial for improving the dewatering process of sludge, their impact on the presence and behavior of fecal pathogens in soil remains unclear. This study aims to assess four extraction methods for recovering fecal pollution indicators from soil amended with unconditioned and conditioned sludge. The indicators include Escherichia coli (EC), human-specific HF183 Bacteroides (HF183), human adenovirus (HAdV), human BK polyomavirus (BKPyV), human JC polyomavirus (JCPyV), and cross-assembly phage (crAssphage). This study also examines how soil moisture content affects the decay of these fecal pollution indicators in soil amended with raw sludge and investigates the influence of conditioning treatments with cationic polyacrylamide (PAM), Fenton’s reagents, Fe[III]/CaO on their persistence in soil. The results indicated that the direct extraction method was the most effective and unbiased for recovering fecal pollution indicators from sludge-amended soil compared with the three elution-concentration methods. All fecal pollution indicators, except HAdV, remained stable under dry soil conditions, while high soil moisture content (48.39%–53.14%) slowed the decay rates of these indicators. During the application of sludge to soil, effective control of fecal pollution indicators was observed, with JCPyV and HAdV becoming undetectable within a short period. The log reduction values of HF183, BKPyV, and crAssphage ranged from 0.1 to 2.8 logs after 30 d of cultivation. The application of conditioned sludge, especially Fenton’s reagent-conditioned sludge, resulted in a reduction in human fecal contamination in the receiving soil. Therefore, implementing appropriate conditioning methods, such as using Fenton’s reagent, can effectively mitigate the health risks associated with fecal pathogens.

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调节处理可减轻污水污泥土地应用过程中土壤中的粪便污染指标水平
污水污泥是环境中粪便病原体的主要来源,将其施用于土地会导致这些病原体大量释放到土壤中。虽然调节处理对改善污泥脱水过程至关重要,但其对土壤中粪便病原体的存在和行为的影响仍不清楚。本研究旨在评估四种萃取方法,以从未经调理和经过调理的污泥改良土壤中回收粪便污染指标。这些指标包括大肠杆菌 (EC)、人类特异性 HF183 杆菌 (HF183)、人类腺病毒 (HAdV)、人类 BK 多瘤病毒 (BKPyV)、人类 JC 多瘤病毒 (JCPyV) 和交叉组装噬菌体 (crAssphage)。本研究还探讨了土壤含水量如何影响这些粪便污染指标在生污泥改良土壤中的衰变,并研究了阳离子聚丙烯酰胺(PAM)、芬顿试剂、Fe[III]/CaO 等调节处理对其在土壤中持久性的影响。结果表明,与三种洗脱浓缩法相比,直接萃取法回收污泥改良土壤中的粪便污染指标最有效,且无偏见。除HAdV外,所有粪便污染指标在干燥土壤条件下均保持稳定,而高土壤含水量(48.39%-53.14%)会减缓这些指标的衰减速度。在土壤中施用污泥时,粪便污染指标得到了有效控制,JCPyV 和 HAdV 在短期内检测不到。培养 30 天后,HF183、BKPyV 和 crAssphage 的对数值降低了 0.1 至 2.8 个对数值。施用调理污泥,尤其是芬顿试剂调理污泥,可减少受纳土壤中的人类粪便污染。因此,采用适当的调理方法,如使用芬顿试剂,可以有效降低与粪便病原体相关的健康风险。
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来源期刊
Science China Technological Sciences
Science China Technological Sciences ENGINEERING, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
10.90%
发文量
4380
审稿时长
3.3 months
期刊介绍: Science China Technological Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Technological Sciences is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of technological sciences. Brief reports present short reports in a timely manner of the latest important results.
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