净水技术2025，Vol.44Issue(4)：141-149,9.DOI:10.15890/j.cnki.jsjs.2025.04.017
河道底泥水热减量及重金属稳定化
Hydrothermal Reduction of River Sediment and Stabilization of Heavy Metals
摘要
Abstract
[Objective]In order to investigate the effect of hydrothermal treatment on the reduction and stabilization of heavy metals in river sediment,[Methods]this paper took the river sediment of Shanghai east diversion river as the test object,and investigated the physicochemical properties of the river sediment,the chemical forms of the heavy metals(zinc,copper,chromium,cadmium,nickel,and lead),the eco-toxicity and the leaching toxicity under the conditions of different hydrothermal treatments,and also elaborated on the mechanism of the sediment's hydrothermal heavy metal stabilization.[Results]During the hydrothermal treatment,the sediment undergoes dewatering,dehydroxylation,decarboxylation,deamination,and aromatization,and its H/C ratio,O/C ratio,and pH decrease,which improved the sediment reduction and stabilization effect;at the same time,the increase of the porosity and specific surface area of the sediment,and the decrease of the particle size facilitated the release of water from the sediment.After hydrothermal treatment,the bioeffective components of heavy metals were reduced and transformed into more stable components,[Results]resulting in a significant reduction of their environmental state toxicity and leaching toxicity,with low or no risk of contamination,which provided a certain basis for the subsequent resource utilization of the sediment.[Conclusion](1)The hydrothermal temperature of 260℃and the reaction time of 3.0 h are conducive to maximizing the stripping of organic matter in the sediment.(2)The hydrothermal treatment promotes the migration of heavy metals in the solid-liquid phase of the sediment.(3)The hydrothermal treatment promotes the release of heavy metals in the solid-liquid phase in weakly bound form to the liquid phase,which might form more stable minerals with the anions in the liquid phase through precipitation and complexation,and at the same time,the aromatic groups generated by the reaction of some of the organic materials in the sediment generated strong compounds with the heavy metals to immobilize them,thus decreasing the bioefficacy and eco-toxicity of the heavy metals in the sediment.关键词
河道底泥/水热处理/重金属/减量化/稳定化Key words
river sediment/hydrothermal treatment/heavy metal/reduction/stabilization分类
资源环境引用本文复制引用
俞江波,彭斯涵,郑明霞,李伟英,张越,董志强..河道底泥水热减量及重金属稳定化[J].净水技术,2025,44(4):141-149,9.基金项目
上海市青年科技启明星计划(23QB1406400) （23QB1406400）
