新型复合药剂原位修复河道底泥污染

采用新型复合药剂开展河道底泥原位修复技术研究，通过考察河道水质改善效果、底泥中磷含量及形态的变化确定药剂的最佳投加量。结果表明，投加复合药剂对上覆水体中TN、NH4+-N和TP均有不同程度的净化效果，且净化效果随药剂量的增加而增强，最高去除率分别达到23.52%、21.79%和81.5%，上覆水体COD去除率随药剂投加量增多呈先升后降的趋势，最高（投加量为600 mg·L-1）达到57.6%。从底泥磷含量及形态变化来看，投加药剂增大了底泥TP含量并促进底泥不稳态磷向稳定态磷转化。因此，从经济成本和修复效果方面综合分析，以投加量为600 mg·L-1对底泥污染原位修复较为合适。

New composite agent in-situ remediation for river sediment pollution

A new composite agent was used for in-situ sediment remediation.The effects of remediation, the concentration of TP in the sediment, and the forms of phosphorus were investigated in this study.The results showed that the new composite agent removed TN, NH4+-N, and TP well, and an enhanced effect was achieved with a dose increase of the new composite agent.The highest removal rates of TN, NH4+-N, and TP were 23.52%, 21.79%, and 81.5%, respectively.In the waterbody overlying the sediment, the removal rate of COD first increased and then decreased, as the dosage of the reagent increased, with the highest removal rate (dosage of 600 mg·L-1) reaching 57.6%.Adding the new composite agent can increase the concentration of TP in the sediment and can promote the conversion of unstable phosphorus to a steady state.Based on economic costs and remediation effects, the optimum dosage of the new composite agent was 600 mg·L-1.