摘要
在泥浆体系中采用Fenton试剂氧化法修复2,4-二氯酚(2,4-DCP)污染的土壤。在恒温、避光条件下,研究2,4-DCP在泥浆体系中的解吸作用,并考察过氧化氢、硫酸亚铁、pH值、水土比、磷酸二氢钾、腐殖酸(HA)等因素对2,4-二氯酚去除效率的影响。试验结果显示,2,4-DCP在泥浆体系中有较高的解吸速率;2,4-DCP的解吸效率与水土比有关,水土比越大,解吸效率越高。研究表明:Fenton试剂氧化法能够有效地去除土壤中的2,4-DCP,过氧化氢和铁的最佳质量比为5:1,最佳pH值范围为2-3;水土比越大,2,4-DCP的去除效果越好;在pH=3时,磷酸二氢钾浓度、腐殖酸投加量和催化剂种类对2,4-DCP的去除效率影响很小。
Fenton＇s reagent was used for remediation of 2,4-dichlorophenol-contaminated soils in the slurry system. Under circumstance of constant temperature and shelter from light, the desorption of 2,4-DCP from contaminated soil was studied, and the effects of H2O2, FeSO4, pH value, liquid-to-soil radios, KH2PO4 and humic acid（HA） on the removal of 2,4-DCP were investigated in the slurry system as well. The results showed that the desorption rate of 2,4-DCP from contaminated soil was high; there was a relationship between liquid-to-soil ratios and desorption efficiency： the higher the liquid-to-soil ratios, the greater the desorption efficiency. It was found that 2,4-DCP in the contaminated soils could be degraded effectively by Fenton＇s reagent; the optimum H202-to-Fe^2＋ ratio （mass） was 5 ： 1 and the optimum pH was between 2 and 3; the higher the liquid-to-soil ratios, the greater the removal of 2,4-DCP. When pH was 3, concentration of KH2PO4, dosage of HA and catalyst types hardly affected the removal of 2,4-DCP in the slurry system.
出处
《生态环境》
CSCD
北大核心
2008年第1期221-226,共6页
Ecology and Environmnet
基金
科技部世博科技专项课题(2005BA908B16)
关键词
FENTON试剂
化学氧化
2
4-二氯酚
污染土壤修复
泥浆
Fenton＇s reagent
chemical oxidation
2,4-dichlorophenol
remediation of contaminated soils
slurry
