受污染底泥陶粒化回填技术及其底泥修复效果
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X703

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国家自然科学基金(91647210,11802158);高等学校与学科创新引智计划(B18031);国家重点研发计划(2016YFC0402506)


Ceramization of contaminated sediment backfill technology and its effects of sediment remediation
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    摘要:

    针对受污染底泥原位或异位修复技术存在需引入外来材料或长期占用土地和易产生二次污染等问题,提出了将疏浚底泥脱水干化及无害化处理后,烧结成陶粒并回填至原疏浚区域的受污染底泥陶粒化回填技术,并从增强床面稳定性、清晰泥水界面、改变底泥中溶解氧垂向分布和减少底泥污染物释放通量等方面,探讨了该技术修复底泥的潜力。底泥疏浚可直接去除大部分表层污染物,而陶粒制备过程中的高温烧结会降低疏浚底泥的污染程度;陶粒回填后,床面稳定性增加,相同水动力条件下颗粒不易再悬浮,底泥释放通量明显减小,床面溶解氧渗透深度增加。

    Abstract:

    In view of the problems of in-situ or ectopic remediation technology of contaminated sediment, such as the need to introduce foreign materials, or the long-term occupation of land and the prone to secondary pollution, etc. , a contaminated sediment backfill technology(CSBT)was put forward, in which the dredged sediment is sintered into ceramists and backfilled into the original dredged area after dewatering, drying and harmless treatment. The potential of CSBT for remediation of sediment was discussed in terms of enhancing bed stability, clarifying mud-water interface, changing vertical distribution of dissolved oxygen in sediment and reducing pollutant release flux from sediment. Sediment dredging can directly remove most of the surface pollutants, while sintering at high temperature during the preparation of ceramsite can reduce the pollution of dredged sediment. The stability of the bed surface increases, the particles are not easy to suspend again under the same hydrodynamic conditions, the release flux of sediment decreases significantly, and the permeation depth of dissolved oxygen on the bed surface increases after ceramsite backfilling.

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方红卫,李晓翠,黄磊,等.受污染底泥陶粒化回填技术及其底泥修复效果[J].水资源保护,2019,35(3):1-6.(FANG Hongwei, LI Xiaocui, HUANG Lei, et al. Ceramization of contaminated sediment backfill technology and its effects of sediment remediation[J]. Water Resources Protection,2019,35(3):1-6.(in Chinese))

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  • 收稿日期:2018-12-05
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  • 在线发布日期: 2019-05-14
  • 出版日期: 2019-05-20