高岭土改性丝瓜络生物炭修复PAHs污染沉积物及微生物响应  

Effects of kaolin-modified loofah sponge biochar on the remediation of PAHs contaminated sediments and microbial response

作　　者：徐文卓 李高帆 卫昊明 晏再生[2] 尤佳[1,2] 黄娟 XU Wen-zhuo;LI Gao-fan;WEI Hao-ming;YAN Zai-sheng;YOU Jia;HUANG Juan(School of Civil Engineering,Southeast University,Nanjing 210096,China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]中国科学院南京地理与湖泊研究所,湖泊与环境国家重点实验室,江苏南京210008

出　　处：《中国环境科学》2024年第6期3301-3313,共13页China Environmental Science

基　　金：国家自然科学基金资助项目(41977361,41671496);江苏省基础研究计划自然科学基金资助项目(BK20220043)。

摘　　要：采用高岭土改性生物炭或者使用三维立体,如丝瓜络生物炭(LSBC)修复PAHs污染沉积物,制备了三维立体LSBC(3D-LSBC)、改性三维立体LSBC(3D-K-LSBC)、颗粒LSBC(G-LSBC)和改性颗粒LSBC(G-K-LSBC)四种材料.结果表明:G-K-LSBC修复PAHs污染沉积物效果显著,沉积物PAHs去除率达21.76%,PAHs的修复效率提高了1个数量级.各组下层沉积物PAHs生物有效性明显高于上层沉积物(P<0.05);添加G-LSBC和G-K-LSBC有效降低了沉积物PAHs生物有效性,分别为对照组的43.99%~78.48%和39.08%~72.01%.经过150d修复,沉积物PAHs含量未出现明显垂向分布特征(P>0.05).然而,沉积物微生物群落组成发生了明显变化(P<0.05).在3D-K-LSBC和G-LSBC作用下,沉积物微生物物种丰富度和多样性明显提高;其中,在G-K-LSBC作用下,沉积物群落中具有芳香烃降解和芳香化合物降解功能菌属呈显著富集.G-K-LSBC表现出更高的PAHs污染沉积物修复潜力.此外,高岭土改性显著提高了LSBC材料的稳定性.Kaolin-modified biochar or three-dimensional biochar such as loofah sponge biochar(LSBC)were used to remediate PAH-contaminated sediments in this study and prepared four materials,three-dimensional LSBC(3D-LSBC),three-dimensional K-LSBC(3D-K-LSBC),granular LSBC(G-LSBC),and granular K-LSBC(G-K-LSBC).The result showed that:G-K-LSBC had a significant effect on repairing PAHs-contaminated sediments with the PAHs removal rate of 21.76%and contributed to one order of magnitude improvement in the repair effect.The bioavailability of PAHs in the lower sediments of each group was significantly higher than that in the upper sediments(P<0.05).The bioavailability of PAHs in sediments was effectively reduced by the addition of G-LSBC and G-K-LSBC,which was 43.99%~78.48%and 39.08%~72.01%,respectively,of the Control group.After 150 days of remediation,there was no significant vertical distribution of PAHs content in sediments(P>0.05).However,the composition of the sediment microbial community was significantly changed(P<0.05).The richness and diversity of sediment microbial species were significantly improved with 3D-K-LSBC and G-LSBC.Due to G-K-LSBC,there was significant enrichment of functional bacterial genera with aromatic hydrocarbon degradation and aromatic compound degradation functions in sediment communities.G-K-LSBC exhibited higher potential for PAHs-contaminated sediment remediation.Furthermore,the modification of kaolin significantly improved the stability of LSBC materials.

关 键 词：多环芳烃 污染沉积物 高岭土改性丝瓜络生物炭 修复 微生物群落 

分 类 号：X524[环境科学与工程—环境工程]