中国海洋大学学报（自然科学版）2024，Vol.54Issue(9)：96-109,14.DOI:10.16441/j.cnki.hdxb.20230127
改性剂添加量对改性微米铁-微生物耦合体系去除三氯乙烯效能的影响
Effect of Modifier Dosage on the Effectiveness of Modified Micron Zero-Valent Iron-Anaerobic Bacteria Coupling System for Trichloroethylene Removal
摘要
Abstract
Sulfidation and carbon modification based on ball milling is an effective means to improve the selectivity of micron zero-valent iron(mZVI)for trichloroethylene(TCE)reduction,but its modifica-tion effect is often influenced by the modifier dosage.The effect of modifier dosage on the remediation performance of modified mZVI and anaerobic bacteria coupled systems is not yet clear.In this paper,we systematically investigated the effect of modifier dosage on the removal of TCE and the representative coexisting electron acceptor NO3 by setting up several sulfated mZVI-anaerobic bacteria systems(S-mZVIbm/AB)and carbon modified mZVI-anaerobic bacteria systems(C-mZVIbm/AB).The experi-mental results showed that both S-mZVIbm/AB and C-mZVIbm/AB systems with different modifier dos-age could significantly improve the removal performance of TCE,and the TCE removal efficiency in-creased first and then decreased with the increase of modifier dosage;The S-mZVIbm/AB system inhibi-ted the removal of NO3,the degree of inhibition showed an increasing trend with the increase of S/Fe molar ratio,while the C/Fe mass ratio did not affect the removal of NO 3-in the C-mZVIbm/AB system.Both S-mZVIbm/AB and C-mZVIbm/AB systems modulated the product composition of TCE and NO 3-,and both promoted the formation of saturated hydrocarbon compounds and N2,and the promotion effect was proportional to the modifier dosage.The mechanisms affecting dechlorination and denitrification in the coupled systems were explored by analyzing the microbial community structure,and it was found that a large number of bacteria involved in dechlorination and denitrification existed in both S-mZVIbm/AB and C-mZVIbm/AB systems,and the abundance of denitrifying bacteria was higher than that of de-chlorinating bacteria,which was responsible for the rapid removal of NO3 and higher concentration of N2 production.关键词
微米零价铁-微生物耦合技术/硫化/碳改性/三氯乙烯/硝酸盐Key words
micron zero-valent iron-anaerobic bacteria coupling technology/sulfidation/carbon modifi-cation/trichloroethylene/nitrate分类
建筑与水利引用本文复制引用
王丽涛,陈丽君,王丽艳,林诺瑶,唐源,葛辰希,辛佳..改性剂添加量对改性微米铁-微生物耦合体系去除三氯乙烯效能的影响[J].中国海洋大学学报（自然科学版）,2024,54(9):96-109,14.基金项目
国家自然科学基金项目(41877176)资助 Supported by the National Natural Science Foundation of China(41877176) （41877176）
