铁基生物炭联合生物电化学原位修复Pb-多环芳烃复合污染底泥的效果与机理  

Effect and mechanism of Fe-based biochar combined with bioelectrochemical technology for in situ remediation of Pb-polycyclic aromatic hydrocarbons contaminated sediment

作　　者：吴云鹏 曾庆军[2,3] 陈平山 欧阳晓芳[2,3] 胡继业 冯春华 孙健 WU Yun-peng;ZENG Qing-jun;CHEN Ping-shan;OUYANG Xiao-fang;HU Ji-ye;FENG Chun-hua;SUN Jian(Seventh Engineering Company of CCCC Fourth Harbor Engineering Co.Ltd,Guangzhou 510230,China;CCCC Fourth Harbor Engineering Institute Co.,Ltd,Guangzhou 510230,China;Key Laboratory of Environmental Protection&Safety of Communication Foundation Engineering,CCCC,Guangzhou 510230,China;School of Environment and Energy,South China University of Technology,Guangzhou 510006,China;School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]中交四航局第七工程有限公司,广州510230 [2]中交四航工程研究院有限公司,广州510230 [3]中交交通基础工程环保与安全重点实验室,广州510230 [4]华南理工大学环境与能源学院,广州510006 [5]广东工业大学环境科学与工程学院,广州510006

出　　处：《生态学杂志》2023年第2期504-512,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金(51108186);广东省培养高层次人才特殊支持计划项目(2015TQ01Z039);中交交通基础工程环保与安全重点实验室开放课题(KFKT-SG-2021-03)项目资助。

摘　　要：城市河道及附近水体底泥是重金属和持久性有机污染物的重要汇集地。本研究以Pb-菲复合污染底泥为对象,探索铁基生物炭联合微生物电化学技术对底泥的原位修复效果与机理。结果表明,通过浸渍烘干法制备的铁基生物炭表面铁以Fe_(3)O_(4)和γ-Fe_(2)O_(3)为主,具有磁性。铁基生物炭联合生物电化学(0.2 V)使底泥中菲的去除速率提高6.75倍,主要原因在于阳极可作为电子受体强化底泥中菲的共代谢降解,额外投加葡萄糖加速了底泥菲的生物电化学降解,导致菲的去除速率增大1.09倍。同时,阳极生物电化学过程降低了底泥pH,促进了底泥Pb向弱酸可溶态转化,在电场力作用下向阴极迁移并转化为残渣态。高通量测序结果表明,铁基生物炭联合生物电化学促进了底泥中Tissierella、Erysipelotrichaceae和Pseudomonas三类细菌的生长,导致了菲的生物电化学强化降解及Pb活化。Sediments from urban rivers and nearby water bodies are enriched with heavy metals and persistent organic pollutants. In this study, we investigated the performance and mechanisms of in-situ remediation of sediment polluted with Pb and phenanthrene by iron-based biochar combined with bioelectrochemical technology. The results showed that the iron-based biochar can be prepared by impregnation and drying method. The surface iron was mainly composed of Fe_(3)O_(4)and γ-Fe_(2)O_(3), which has magnetic property. The iron-based biochar combined with bioelectrochemical technology(0.2 V) increased removal rate of phenanthrene in sediment by 6.75 times, mainly because that the anode can be used as an electron receptor to strengthen the co-metabolic degradation of phenanthrene in sediment. Addition of glucose further accelerated bioelectrochemical degradation of phenanthrene in sediment, resulting in an increase of phenanthrene removal rate by 1.09 times. The anodic bioelectrochemical process reduced sediment pH and promoted the transformation of Pb to weakly acid soluble state which was migrated to the cathode and transformed to residual state under the action of electric field force. The results of high-throughput sequencing showed that iron-based biochar combined with bioelectrochemistry promoted the growth of Tissierella, Erysipelotrichaceae and Pseudomonas in the sediments, leading to the bioelectrochemical enhanced degradation of phenanthrene and Pb activation.

关 键 词：铁基生物炭 生物电化学 多环芳烃 重金属 强化去除 

分 类 号：X52[环境科学与工程—环境工程]