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| Effects of sludge fermentation residue on the accumulation and transport of heavy metals in Vetiveria zizanioides at an e-waste dismantling site |
| Received:November 01, 2021 |
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| KeyWord:sludge fermentation residue;soil remediation;heavy metal;humus;Vetiveria zizanioides |
| Author Name | Affiliation | E-mail | | GUO Jiangshan | School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China | | | GU Weihua | School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China
School of Environment, Zhejiang University of Technology, Hangzhou 310014, China | | | BAI Jianfeng | School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China | jfbai@sspu.edu.cn | | DONG Bin | School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | ZHUANG Xuning | School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China | | | ZHAO Jing | School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China | | | WANG Jingwei | School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China | |
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| Abstract: |
| To explore the effects of high-temperature aerobic fermentation sludge residue (hereinafter referred to as 'fermentation residue') on soil improvement and Vetiveria zizanioides growth at an e-waste dismantling site, a potting experiment was performed by adding different dosages of fermentation residue to the soil (the ratios of fresh weight were 3% and 6%) . Parameters such as soil organic matter, nutrients, and heavy metals fraction, accumulation, and transport in the plant were analyzed. The results showed that the application of fermentation residue significantly increased the fluorescence index and the integral value of UV absorbance of soil dissolved organic matter in the range of 226~400 nm, whereas the biogenic index showed the opposite trend. The fermentation residue significantly increased the soil conductivity and the content of available phosphorus and potassium but significantly reduced the soil pH. Compared to the original soil without remediation, all treatments increased the proportion of the stable fractions of heavy metals. Compared to the control, the application of fermentation residue significantly increased the proportion of Cu, Pb, Zn, and Cd in stable fractions by 4.8~7.3, 7.8~9.0, 3.7~6.4 percent points, and 1.8~4.0 percent points, respectively. The application of fermentation residue promoted the growth of Vetiveria zizanioides, and the addition of 3% fermentation residue significantly increased the fresh weight, plant height, and chlorophyll a+b content by 8.2%, 11.9%, and 6.6%, respectively. The fermentation residue reduced the concentrations of Cu, Cd, Zn, and Pb in the plant at rates of 10.4%~20.6%, 24.0%~52.0%, 2.5%~5.1%, and 12.4%~23.6%, respectively. Fermentation residue inhibited the transport of Cu, Zn, and Pb to the aboveground parts of the plant, but promoted the transport of Cd. Our results indicate that the application of fermentation residue introduces humus into the soil, improves soil properties, and promotes the stabilization of heavy metals and the growth of Vetiveria zizanioides. Fermentation residue has potential application value for the ecological restoration of soil in contaminated sites. |
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