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首页> 外文期刊>Science of the total environment >Comprehensive assessment of flocculation conditioning of dredged sediment using organic polymers: Dredged sediment dewaterability and release of pollutants
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Comprehensive assessment of flocculation conditioning of dredged sediment using organic polymers: Dredged sediment dewaterability and release of pollutants

机译：用有机聚合物综合评价疏浚沉积物的絮凝条件：疏浚沉积物脱水性和污染物的释放

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摘要

Dredged sediment contains various contaminants that are released during the process of dewatering and subsequent utilization. In this study, two organic polymers-chitosan (CS) and cationic polyacrylamide (CPAM) both in samples of varying molecular weights (MWs)-were used as flocculants to improve dewatering and rheological behaviors of dredged sediment, and floe properties were characterized to unravel the mechanisms of flocculation treatment. Moteover, pollutant transfer and release in the flocculation-dewatering process was investigated. Compared to CPAM, CS had better performance in dredged sediment dewatering, and more compact floes were produced after treatment. The flocculated sediment belonged to the type of yield dilatant fluid and showed good shear resistance. Three-dimensional excitation-emission matrix spectroscopy and PARAFAC showed that protein-like substances were removed after treatment. The MW of CS had insignificant effects on flocculation performance, whereas CPAM removal efficiency for protein-like substances was increased at higher MWs, which may be related to the adsorption bridging effect of CPAM polymer chains. There were significant correlations between the dewatering performance of sediments, MW distribution of organics and rheological properties. CS and CPAM tteatments caused the transformation of Fe/Al-P into Ca-P, which could reduce phosphorus release and its ecological risk. The flocculants contributed to the formation of carbonate-bound forms of As, Cr, Pb, and Ni. Ecological risk assessment results of the geo-accumulation index showed that medium- and low-MW CS reduced risk of sediment contamination, whereas CPAM and high-MW CS increased the ecological risk. CS had a greater effect on the release of VOCs than CPAM, with an increased release of total VOCs at higher flocculant MWs. The study was helpful to understand the dewatering mechanism of dredged sediment and provided a new strategy for pollution release management in sediment dewatering.
机译：疏浚沉积物含有在脱水过程中释放的各种污染物和随后的利用率。在该研究中，在不同分子量（MWS）的样品中，两个有机聚合物 - 壳聚糖（Cs）和阳离子聚丙烯酰胺（CPAM）用于改善絮凝剂以改善疏浚沉积物的脱水和流变性行为，并且表征剥落性能絮凝处理机制。研究了絮凝剂脱水过程中的炸植物，污染物转移和释放。与CPAM相比，CS在疏浚沉积物脱水方面具有更好的性能，治疗后生产更紧凑的絮凝物。絮凝的沉积物属于屈服膨胀液的类型，并显示出良好的抗剪切抗性。三维激发发射矩阵光谱和Parafacac显示处理后蛋白质样物质。 CS的MW对絮凝性能有微不足道的影响，而在较高的MWS上增加了蛋白质物质的CPAM去除效率，这可能与CPAM聚合物链的吸附桥接效果有关。沉积物的脱水性能与有机物和流变性质的脱水性能之间存在显着的相关性。 CS和CPAM TTeations导致Fe / Al-P转化为CA-P，这可能会降低磷释放及其生态风险。絮凝剂有助于形成碳酸盐染色形式，Cr，Pb和Ni。地质累积指数的生态风险评估结果表明，中低MW CS降低了沉积物污染的风险，而CPAM和高MW CS增加了生态风险。 CS对VOC的释放产生了更大的影响，比CPAM增加，较高絮凝物MWS的总VOC释放增加。该研究有助于了解疏浚沉积物的脱水机制，并为沉积物脱水提供了一种新的污染释放管理策略。

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  • 来源
    《Science of the total environment》 |2020年第15期|139884.1-139884.14|共14页
  • 作者

    Zhenzhen Song; Weijun Zhang; Hongyu Gao; Dongsheng Wang;

  • 作者单位

    Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 430074 Hubei China;

    School of Environmental Studies China University of Geosciences Wuhan 430074 Hubei China;

    Institute for resources and environmental engineering Shanxi University Taiyuan 030006 Shanxi China;

    School of Environmental Studies China University of Geosciences Wuhan 430074 Hubei China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China;

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  • 正文语种 eng
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  • 关键词

    Dredged sediment dewatering organic; Rheological behavior; Pollutants transferring; Organic polymers;

    机译：疏浚沉积物脱水有机;流变行为;污染物转移;有机聚合物;

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