Comparison of exogenous degrader-enhanced bioremediation with low-dose persulfate oxidation for polycyclic aromatic hydrocarbon removal in alkaline soil:efficiency and influence on ecological health  

作　　者：Zhuoyue Yang Zuotao Zhang Yiwei Zuo Jing Zhang Panyue Zhang 

机构地区：[1]Beijing Key Laboratory for Source Control Technology of Water Pollution,College of Environmental Science&Engineering,Beijing Forestry University,Beijing 100091,China [2]School of Environment,Tsinghua University,Beijing 100084,China [3]Beijing 101 Middle School,Beijing 100091,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第11期157-168,共12页环境科学与工程前沿（英文）

基　　金：supported by the National Key Research and Development Program of China(Nos.2020YFC1808801,2020YFC1808805);the National Natural Science Foundation of China(Nos.41773082,41573065).

摘　　要：Polycyclic aromatic hydrocarbon(PAH)-contaminated soils are usually complex and characterized by a lack of nutrition and soil salinization,resulting in difficulties in soil remediation.In this study,bioaugmentation with a PAH-degrading Bacillus PheN7(BA)and low-dose persulfate oxidation(PS),along with natural biodegradation,were utilized to remediate alkaline PAH-contaminated soil.The soil used in the study had a pH of 9.35,and the total PAH content was 568.8±31.0 mg/kg dry soil.After 42 d of remediation,the degradation efficiency of PAHs was 96.72%and 93.88%using persulfate oxidation and bioaugmentation,respectively,whereas 38.66%of PAHs were degraded in natural attenuation(NA).Bacillus was the dominant genera throughout the process of bioremediation with the relative abundance of 79.3%on day 42 in the BA system,whereas,Alcanivorax was enriched and became the dominant genera in PS systems.In the meantime,PAH degradation genes were detected with remarkably higher level in the BA system than in PS system during the remediation.In addition to the degradation of contaminants,persulfate oxidation promotes microbial bioremediation efficiency mainly by lowering the pH to neutral and increasing the active phosphorus content in the soil.Microbial species and ecological niches were less reduced in the PS system than in the BA system.Collectively,persulfate oxidation had a better impact on the soil microbiome and is more suitable for long-term soil health than bioaugmentation through PheN7 addition.

关 键 词：BIOAUGMENTATION Low-dose persulfate oxidation Polycyclic aromatic hydrocarbon Remediation 

分 类 号：X53[环境科学与工程—环境工程]