两种固化剂协同稳定底泥重金属的实验研究

Experiment Research of the Collaboration of Two Curing Agents on Stabilization Treatment for Heavy Metal Polluted Sediment

采用磷酸氢二钾和氧化钙,以不同剂量和配比添加到底泥之中,风干后进行重金属毒性浸出实验,考察了的最优配比和不同因素对稳定化效果的影响。结果表明:当二者共存时,对底泥中Mn、Pb、Cd、Cu、Zn具有较好的固化作用,固化效果最优的配比是底泥、磷酸氢二钾与氧化钙以质量比为50∶3∶3的比例,浸提液中Mn、Pb、Cd、Cu、Zn浸出量较对照分别降低96.8%、97.8%、99.0%、98.0%和93.6%。并且在不同因素影响下,最优配比体现出较好的适用性,达到相应国家标准,为资源化利用提供了前提。

Dipotassium hydrogen phosphate and calcium oxide were added to tested sediment, and they were mixed at different doses and mass ratios to make group matching curing agents.The dried sediment was tested to study the effects of the curing agents on the immobilization of heavy metals through extraction procedure for leaching toxicity tests （ TCLP） . The results showed that when dipotassium hydrogen phosphate and calcium oxide were coexisted in sediment, the immobilization of Mn, Pb, Cd, Cu, Zn had good effects, and a mass ratio of 50：3：3 for sediment, dipotassium hydrogen phosphate and calcium oxide.In the optimum ratio, the leaching concentrations of Mn, Cd, Pb, Cu, Zn were decreased by 96.6%, 95.9%, 98.7%, 99.5%, 94.7%, respectively.Under the influence of different factors, the optimum ratio also reflected the good applicability and achieved the corresponding national standards, which provided a foundation for recycling use of sediment.