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| Cd and As immobilization in co-contaminated paddy soil using two urease-producing bacteria |
| Received:June 22, 2022 |
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| KeyWord:microbial induced carbonate precipitation|bioremediation|soil ecological function|urease-producing bacteria |
| Author Name | Affiliation | E-mail | | CAI Qian | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | LI Xinwu | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | YANG Yuting | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | HUANG Jinfu | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | LUO Yan | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | YANG Run | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | WU Jun | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | XU Min | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | xumin_xyz@126.com |
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| Abstract: |
| Microbial-induced carbonate precipitation（MICP）is a technology for heavy metal bioremediation with the main advantages of being environmentally friendly and effective. In this study, we explored the effects of Sporosarcina pasteurii（SP）and Bacillus cereus（BC） on cadmium（Cd）and arsenic（As）immobilization, soil properties, and soil enzymatic activities in a Cd and As co-contaminated paddy soil under control（CK）and urea addition（UREA）treatments. The results of this study might assist in reducing the risk of agricultural soils containing both Cd and As. CaCl2-Cd and CaCl2-As were significantly reduced by BC treatment compared to CK treatment, by 30.2% and 9.10%, respectively. Compared with CK treatment, SP treatment and BC treatment significantly reduced oxidizable Cd and increased residual Cd, while only BC treatment significantly reduced oxidizable As and increased residual As. With the addition of UREA, SP, and BC treatments, the carbonate content was increased. UREA, SP, and BC treatment significantly increased urease compared to CK treatment by 48.0%, 32.8%, and 11.7%, respectively, indicating that these treatments stimulated the process of MICP. Compared to CK treatment, SP treatment and BC treatment considerably increased soil total nitrogen, total phosphorus, total potassium, and ammonium nitrogen, but decreased nitrate-nitrogen, which implied that the MICP method helped enhance soil fertility and stimulated ammonization but inhibited nitrification. BC treatment enhanced soil phosphatase and sucrase in comparison to CK treatment, improving soil function. Taken together, B. cereus immobilized Cd and As, enhanced soil fertility, and increased enzyme activity, making it a promising candidate for bioremediation, particularly for soil that had been contaminated with both Cd and As. |
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