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| Effects of photosynthetic bacteria and biochar on chromium stabilization in polluted soil and the growth of pakchoi |
| Received:February 07, 2021 |
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| KeyWord:Rhodobacter sphaeroides;biochar;chromium;soil;pakchoi |
| Author Name | Affiliation | E-mail | | REN Xiaobin | School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China | | | BAI Hongjuan | School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China | bhj44871@163.com | | WEI Yanhong | School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China | | | MA Rui | School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China | | | JIA Wanli | School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China | | | YANG Guane | College of Pharmacy, Shanxi Medical University, Taiyuan 030001, China | |
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| Abstract: |
| This study aimed to investigate the remediation effects of photosynthetic bacteria and biochar on chromium contaminated soil, using photosynthetic bacteria Rhodobacter sphaeroides H strain and biochar as remediation materials, simulating chromium contaminated soil as a research object. Therefore, potted experiments were conducted to study how the H strain, biochar, and their combination could affect chromium stabilization in the chromium-contaminated soil, just as well as plant height, root length, and the chlorophyll and soluble sugar content of pakchoi. The experimental results showed that the combined remediating effect of the H strain and biochar yielded better results after 30 days of remediation than that of the separate application of H strain and biochar. The best remediation effect could be observed when the amount of the supplemented H strain reached 108CFU·g-1 and that of the biochar 1%(mass ratio)(T6). Compared with the H strain and biochar only, the bioavailability of chromium was reduced by 8.03% and 9.11%, respectively, while the catalase, urease, invertase, and alkaline phosphatase activities in the soil were 58.72%, 98.25%, 136.58%, and 61.03% higher than those in the CK group (without H strain and biochar), respectively. The T6 group exhibited a significantly affected the growth of pakchoi under chromium stress. Compared with the CK group, the chromium content of the aerial part and root of the pakchoi plant were reduced by 26.67% and 14.84%, respectively, significantly promoting the growth of pakchoi under chromium stress, yielding an increase in the chlorophyll and soluble sugar content of the leaves by 30.08% and 17.39%, respectively. According to the results of the XPS and XRD analysis, we hypothesize that the main repair mechanism of H strain and biochar involves mixed reduction and electrostatic adsorption. And the two have good repair and growth-promoting effects on contaminated soil and pakchoi. |
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