自然降雨和固化剂对固化河道污泥的影响：环境特性

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-07-18 DOI:10.1016/j.envpol.2025.126850

Mengyi Wei , Junjie Shen , Suqing Wu , Xiangyong Zheng , Min Zhao , Sihong Liu , Liujiang Wang , Chunzhen Fan , Noriyuki Yoshida , Hongbin Cui

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引用次数: 0

摘要

利用固化疏浚污泥建设生态护坡是实现河流污泥可持续利用的重要策略。评价河流固化污泥长期暴露于自然条件下的环境特性，是评价其生态安全性和实际适用性的基础。在本研究中，采用常规水泥（CC）和新型复合固化剂（GCP）来稳定河流污泥。考察了自然降雨侵蚀对固化污泥理化性质和环境特性的影响。特别侧重于水污染物的释放模式，包括氮、磷和两种类型的固化污泥在自然降雨暴露下的重金属。结果表明，降雨侵蚀降低了固化污泥的强度和pH值，影响了污泥中重金属、氮、磷的固定作用，促进了重金属、氮、磷的释放。与CC相比，GCP对污染物的固定效果更好，对降雨侵蚀的缓冲能力更强。降雨侵蚀后GCP固化污泥（GCPSS）的抗压强度是CC固化污泥（CCSS）的1.35倍。在多个降雨事件的作用下，GCPSS中总磷和总氮浓度显著降低。在GCPSS上培养的短爪蟹生长性能优越，微生物多样性和丰度更高。值得注意的是，假假菌、盖氏菌和芽孢杆菌的数量增加，对土壤的稳定性有积极的作用。相比之下，CCSS的微生物群落没有显著变化。研究结果对评价江河固化污泥在生态护坡建设中的可行性和环境安全性具有重要意义。

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Impact of natural rainfall and solidifying agents on solidified river sludge: Environmental characteristics

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Impact of natural rainfall and solidifying agents on solidified river sludge: Environmental characteristics

Application of solidified dredged sludge for constructing ecological slope protection represents a vital strategy for sustainable utilization of river sludge. Evaluating the environmental characteristics of solidified river sludge under prolonged exposure to natural conditions is essential for assessing its ecological safety and practical applicability. In this study, conventional cement (CC) and a novel composite solidifying agent (GCP) were employed to stabilize river sludge. Impact of natural rainfall erosion on the physicochemical properties and environmental characteristics of the solidified sludge was examined. Particular focus was placed on the release patterns of water pollutants, including nitrogen, phosphorus, and heavy metals from both types of solidified sludge under natural rainfall exposure. The results showed that rainfall erosion reduced the strength and pH of the solidified sludge, affected the immobilization effect of heavy metals, nitrogen, phosphorus, and promoted their release. Compared with CC, GCP exhibited better immobilization effects on pollutants and a stronger buffering capacity against rainfall erosion. The compressive strength of the GCP solidified sludge (GCPSS) after rainfall erosion was 1.35 times greater than that of the CC solidified sludge (CCSS). The concentrations of total phosphorous and nitrogen in the GCPSS decreased significantly under the action of multiple rainfall events. Cynodon dactylon cultivated on the GCPSS demonstrated superior growth performance, accompanied by greater microbial diversity and abundance. Notably, the populations of Pseudolabrys, Gaiella, and Bacillus were enriched, contributing positively to soil stability. In contrast, the microbial community in the CCSS exhibited no significant variation. These findings are important for assessing the feasibility and environmental safety of utilizing solidified river sludge in the construction of ecological slope protection.

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.