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| Treated sludge residue amelioration of contaminated soil at an e-waste dismantling site |
| Received:October 12, 2022 Revised:November 28, 2022 |
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| KeyWord:sludge pyrolysis;sludge aerobic fermentation;soil pollution;heavy metal;ecological restoration |
| Author Name | Affiliation | E-mail | | GUO Jiangshan | School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China
CCCC(Suzhou) Urban Development and Construction Co., Ltd., Suzhou 215031, 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 | | | ZHANG Chenglong | School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China | |
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| Abstract: |
| The effects of two types of treated sludge residue on soil improvement were evaluated in a potting experiment by adding pyrolysis residue and aerobic fermentation residue to the soil. The effects of parameters such as soil nutrients, enzyme activities, leaching content of heavy metals, and plants（Lolium perenne and Vetiveria zizanioides）on heavy metal accumulation and growth were analyzed. Additionally, the effects of soil improvement were evaluated using the fuzzy membership function. The results showed that application（5%）of the two types of treated sludge residue introduced humic acid-like substances into the soil. The soil conductivity（220% - 238%）, ammonium nitrogen（16%-66%）, cation exchange capacity（37%-84%）, available phosphorus（34%-42%）, available potassium（44%-97%）, organic matter content（17%-47%）, and enzymatic activity of fluorescein diacetate（67%-119%）were significantly increased. The fresh weight （32%-36%）, height（18%-22%）, chlorophyll（12%-16%）, phosphorus（33%-48%）, and potassium content（12%-21%）of plants were also significantly increased. The concentrations of Cu（17%-33%）, Zn（5%-9%）, Pb（32%）, Cd（35%）, and malondialdehyde（18%-22%） were significantly reduced. The leaching amount of Cu（10%-19%）, Zn（18%-20%）, Pb（10%-16%）, and Cd（13%-15%）of soil were significantly reduced. The order of soil improvement effects of each treatment was as follows：aerobic fermentation residue > pyrolysis residue, V. zizanioides>L. perenne. Our results indicate that the two methods for treating sludge residue promote improvements in soil quality and plant growth. Aerobic fermentation residue and V. zizanioides show application potential for the ecological restoration of soil at e-waste dismantling sites. |
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