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| Effect of co-pyrolysis of chicken manure and agricultural or forestry wastes on residual heavy metals and antibiotics in biochar |
| Received:March 21, 2019 |
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| KeyWord:chicken manure;agricultural or forestry wastes;pyrolysis;heavy metals immobilization;antibiotics decomposition |
| Author Name | Affiliation | E-mail | | TIAN Ren-qiang | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | XIE Sheng-yu | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Chun-xing | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | | | CAO Zhi-hong | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | YU Guang-wei | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | | | WANG Yin | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | yinwang@iue.ac.cn |
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| Abstract: |
| To reduce the risk of heavy metals and antibiotics pollution in the process of resource utilization of livestock feces, chicken manure, and agricultural or forestry wastes(bamboo chips, sawdust, chaff, and rice husk) were co-pyrolyzed at 600℃ for the safe disposal of chicken manure. The results showed the co-pyrolysis of chicken manure and agricultural or forestry wastes could reduce the biochar yield, ash content, and volatile matter; the content of N and S decreased, and the content of fixed carbon, C, and H increased. The pH, electrical conductance, and cation exchange capacity of biochar obtained by co-pyrolysis decreased with the increase in the proportion of agricultural or forestry wastes. Co-pyrolysis of chicken manure with bamboo sawdust, sawdust, chaff, and rice husk could significantly reduce the total concentration of Cr, Ni, Cu, Zn, As, Cd, and Pb(except As and Pb in biochar derived from co-pyrolysis of chicken manure and sawdust). Among them, the decrease in Cu and Zn was the most significant. Co-pyrolysis of chicken manure and bamboo chips could promote the transformation of As to the residual fraction. The proportion of bioavailable forms of Ni and Cd in biochar derived from co-pyrolysis of chicken manure and sawdust decreased. The residual fractions of Cu in chicken manure-chaff biochar and Zn in chicken manure-rice husk increased. The leaching concentrations of all heavy metals in all co-pyrolysis biochars were far below the concentration limit of USEPA 1993, which indicated no leaching toxicity. The results of the pilot-scale test were similar to those of the laboratory-scale test. The removal rates of tylosin, tetracycline, sulfadiazine, and sulfamethoxazole in the pilot biochars were all 100%. |
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