Chun Zhang, Jing Wang, Haonan Zhang, Feiyu Lu, Chendao Ruan, Jianhao Tong, Jiayu Ren, Jiyan Shi
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引用次数: 0
Abstract
Traditional microbial remediation techniques face challenges in simultaneously addressing soil contamination by both chromium (Cr) and lead (Pb). This study introduces a novel composite system comprising biochar and the phosphate-solubilizing microorganism P. oxalicum SL2—for the simultaneous stabilization of Cr and Pb in contaminated soil. In this study, we found that the functional strain P. oxalicum SL2 was able to reduce Cr(VI), which is more toxic and migratory in soil, to Cr(III) with the assistance of biochar, and synchronously enhanced the stability of Cr and Pb in the soil, which transformed them toward a more stable endowment form. The efficiency of Cr(VI) reduction stabilization in soil was 77.6% within 30 d. Meanwhile, the effective concentrations of Pb in the soil decreased by about 27.3%. Furthermore, the biochar-P. oxalicum SL2 system significantly increased the activities of urease and acid phosphatase and promoted nutrient cycling. The principal environmental factors, such as Cr(VI), CaCl2-Pb, HNO3-Pb, Eh, S-UE, and S-ACP, were recognized as significant determinants influencing the structure and composition of fungal and bacterial communities in soil. Notably, the growth of Lysinibacillus, Brevundimonas, and Paenibacillus collectively reduced the bioavailability of Cr and Pb in the soil. This research presents an innovative strategy for the remediation of soils contaminated with heavy metals, utilizing a combination of biochar and phosphate-solubilizing microorganisms.
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.