Enhanced anaerobic degradation of hexachlorobenzene in a Hydragric Acrisol using humic acid and urea  

作　　者：Cuiying LIU Jianling FAN Xianghua xu Yu Wu 

机构地区：[1]Jamgsur Key Labonwory of Agric s/rurad Merorolog,Schod of Appled Mee onog.Monjing Universiy of lfrmron Seiene and Technodog.Nonjing 210044,China [2]Key Labornaory of Soul Envirowment and Prlwriom Remediaton.Musimte of Sofl Sciemce,Chinese Aecademy of Scencex,Nanjing 20008,China [3]Jimgsw Key Laboraory of Amospheric Enviromumenr Monioring and Pollariorn Comirod,Jiangsu Collaborarive Iamovarion Cener of Amospherir Envirommenr and Equipmen Technology,School of Eavinmmental Sciemce md Engineering.Maning Uniersiny of Inpiormatienn Sciemce and Tecrmelogy.Nanjing 10044,China

出　　处：《Pedosphere》2021年第1期172-179,共8页土壤圈（英文版）

基　　金：supported by the Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences (No. SEPR20174);the National Natural Science Foundation of China (No. 41671318)。

摘　　要：Humic substances acting as an electron shuttle and nitrogen transformation process influence remarkably the electron transfer in anaerobic reaction systems and thus may affect the reductive dechlorination of hexachlorobenzene(HCB). In order to develop an efficient agricultural strategy for the remediation of organochlorine-contaminated soils, a batch incubation experiment was conducted to study the effects of humic acid, urea, and their interaction on the reductive dechlorination of HCB in a Hydragric Acrisol with high iron oxide content. After 44 d of anaerobic incubation, the five treatments, sterile control,control, humic acid, urea, and humic acid + urea decreased HCB residues by 28.8%, 47.8%, 64.7%, 57.8%, and 71.3%, respectively. The amendment of humic acid or urea significantly decreased soil Eh values and accelerated Fe(Ⅲ) reduction to Fe(Ⅱ), thus promoting markedly reductive dechlorination of HCB. Humic acid had a larger dechlorination effect than urea. Since there was a synergistic interaction between humic acid and urea that accelerated HCB dechlorination, the treatment having both amendments together was the most efficient for HCB dechlorination. The results showed that the combination of NH4^(+)_(-)N supplied by a fertilizer and humic substance is a feasible strategy for the remediation of organochlorine-contaminated soils with abundant iron oxide.

关 键 词：electron-transfer mediator biological iron reduction persistent organic pollutant polychlorinated organic compound reductive dechlorination soil amendment soil remediation 

分 类 号：X53[环境科学与工程—环境工程]