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.
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))复制