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| Effects of biochar on humification and heavy metal passivation of sludge-fungus residue compost |
| Received:November 07, 2021 |
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| KeyWord:sludge;biochar;aerobic composting;heavy metal;passivation;humification |
| Author Name | Affiliation | | LI Simin | Hebei University of Engineering, Hebei Technology Innovation Center of Water Pollution Control and Water Ecological Remediation, Handan 056038, China
Hebei University of Engineering, Handan Key Laboratory of Urban Water Utilization Technology, Handan 056038, China
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China | | ZHANG Yijing | Hebei University of Engineering, Hebei Technology Innovation Center of Water Pollution Control and Water Ecological Remediation, Handan 056038, China
Hebei University of Engineering, Handan Key Laboratory of Urban Water Utilization Technology, Handan 056038, China
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China | | TANG Fengbing | Hebei University of Engineering, Hebei Technology Innovation Center of Water Pollution Control and Water Ecological Remediation, Handan 056038, China
Hebei University of Engineering, Handan Key Laboratory of Urban Water Utilization Technology, Handan 056038, China
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China | | LI Siyu | Hebei University of Engineering, Hebei Technology Innovation Center of Water Pollution Control and Water Ecological Remediation, Handan 056038, China
Hebei University of Engineering, Handan Key Laboratory of Urban Water Utilization Technology, Handan 056038, China
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China | | WANG Yanfei | Hebei University of Engineering, Hebei Technology Innovation Center of Water Pollution Control and Water Ecological Remediation, Handan 056038, China
Hebei University of Engineering, Handan Key Laboratory of Urban Water Utilization Technology, Handan 056038, China
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China | | XU Zheng | Hebei University of Engineering, Hebei Technology Innovation Center of Water Pollution Control and Water Ecological Remediation, Handan 056038, China
Hebei University of Engineering, Handan Key Laboratory of Urban Water Utilization Technology, Handan 056038, China
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China |
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| Abstract: |
| To investigate the effects of biochar on humification and heavy metal passivation of municipal sludge compost, sludge and fungus residue were mixed according to a wet weight ratio of 1:0.7. Next, three piles were set up, no biochar, and biochar with dry weights of 5%, and 10% (denoted as CK, BC5, and BC10, respectively) was added for aerobic composting. The results showed that the addition of biochar to the compost prolonged the high-temperature time and promoted the conversion of fulvic acid to humic acid. Moreover, it reduced the content of water-soluble organic matter and promoted the decomposition of the compost. Of the three dry weight treatments, BC5 had the highest passivation effect on exchangeable Cu and Pb, with passivation rates of 78.12% and 97.82%, respectively. Additionally, BC10 had the highest passivation effect on exchangeable Cr, Ni, and Zn, with rates of 66.64%, 5.88%, and 19.76%, respectively. The increase in Cu, Pb, and Cr residual distribution ratio after composting was in the order of BC10>BC5>CK, and the increase in Ni and Zn residue distribution ratio was in order BC5>BC10>CK. The exchangeable components of Cu, Cr, Pb, and Zn were positively correlated with watersoluble organic compounds and fulvic acid (P<0.01) and negatively correlated with humic acid (P<0.01). The results indicated that the addition of biochar compost was beneficial for humification and heavy metal passivation, and that these processes were correlated. |
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