Abstract
AbstractImmobilized microbial technology has been widely used in wastewater treatment, but it has been used less frequently for soil remediation, particularly in sites that are co-contaminated with organic compounds and heavy metals. In addition, there is limited knowledge on the efficiency of remediation and microbial preferences to colonize the immobilized carriers. In this study, biochar immobilized with Sphingobium abikonense was introduced to remediate soils that were co-contaminated with phenanthrene (PHE) and copper (Cu), and the mechanisms of microbial assemblage were investigated. The immobilized microbial biochar maintained a degradation rate of more than 96% in both the first (0–6 d) and second (6–12 d) contamination periods. The addition of biochar increased the proportion of Cu bound to organic matter, and Fe–Mn oxide bound Cu in the soil. In addition, both Cu and PHE could be adsorbed into biochar pellets in the presence or absence of immobilized S. abikonense. The presence of biochar significantly increased the abundance of bacteria, such as Luteibacter, Bordetella and Dyella, that could degrade organic matter and tolerate heavy metals. Notably, the biochar could specifically select host microbes from the soil for colonization, while the presence of S. abikonense affected this preference. The autonomous selection facilitates the degradation of PHE and/or the immobilization of Cu in the soil. These results provide a green approach to efficiently and sustainably remediate soil co-contaminated with PHE and Cu and highlight the importance of microbial preference colonized in immobilized carriers.
Graphical Abstract
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Science and Technology Support Plan for Youth Innovation of Colleges and Universities of Shandong Province of China
National College Students Innovation and Entrepreneurship Training Program
Qingdao Demonstration and Guidance Project of Science and Technology to Benefit the People
Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province
Publisher
Springer Science and Business Media LLC
Subject
Pollution,Soil Science,Environmental Science (miscellaneous),Biomaterials
Cited by
9 articles.
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