有色金属材料与工程2025，Vol.46Issue(1)：106-115,10.DOI:10.13258/j.cnki.nmme.20240320001
底泥原位固化过程中N、P及重金属形态变化研究
Study on the form changes of N,P and heavy metals during in-situ solidification of sediment
摘要
Abstract
In order to study the form changes of heavy metals,N and P in the solidified sediment,the sediment of a dredged channel in Chongming was taken as the research object,and the solidified sponge soil was prepared with in-situ ecological remediation(ISER)curing agent and animal protein foaming agent.The influences of different curing agent ratio on the compressive strength of the solidified sponge soil,the leaching of heavy metals after curing,forms changes of related heavy metals,N and P of sediment before and after curing were studied.The results showed that the compressive strength of solidified sponge soil increases with the addition of curing agent,and the compressive strength of solidified sponge soil with 15%mass fraction of curing agent was 1.30 MPa at the 28 d curing period.The leaching amounts of heavy metals Pb,Cu and Cd in the solidified sponge solis with 15%and 20%mass fractions of curing agent were in line with the harmless standards of construction.Forms analysis showed that the migration ability of heavy metals decreased.The average mass ratio of total P in the sediment was 497.65 mg/kg,the mass fraction of inorganic P increased from 91.3%to 98.4%,the mass fraction of Ca-P increased from 84.1%to 99.3%,the mass ratio of organic P decreased from 50.25 mg/kg to 13.44 mg/kg,and the mass ratio of Fe-Al/P decreased from 63.74 mg/kg to 18.22 mg/kg at the 28 d curing period.The mass ratios of the ion exchangeable N,the leachable N of weak acid,the leachable N of strong alkali,and the leachable N of strong oxidizer decreased from 218.64,54.45,30.28 and 387.32 mg/kg to 62.42,25.68,19.12 and 101.88 mg/kg,respectively at the 28 d curing period.关键词
底泥/N/P/重金属/形态Key words
sediment/N/P/heavy metal/form分类
资源环境引用本文复制引用
严昊成,宋嘉宇,陈祥元,李飞鹏,陶红..底泥原位固化过程中N、P及重金属形态变化研究[J].有色金属材料与工程,2025,46(1):106-115,10.基金项目
国家自然科学基金资助项目(51679140) （51679140）
