Influence of pyrolysis temperature on the properties and environmental safety of heavy metals in chicken manure-derived biochars. Issue 11 (1st November 2020)

• Record Type: Journal Article
• Authors: Bai, Tianxia; Qu, Wei; Yan, Yubo; Ma, Kuirong; Xu, Yonggang; Zhou, Xuan; Chen, Yan; Xu, Yingyi
• Is Part Of: Journal of environmental science and health. Volume 55:Issue 11(2020)
• Page Start: 941
• Page End: 950
• Publication Date: 2020-11-01
• Subjects: BCR -- biochar -- heavy metals -- manure -- pyrolysis; Pesticides -- Environmental aspects -- Periodicals; Food contamination -- Periodicals; Agricultural wastes -- Environmental aspects -- Periodicals; Ecology -- periodicals; Pesticides -- toxicity -- periodicals; Food Contamination -- periodicals; 363.73
• DOI: 10.1080/03601234.2020.1797424
• Languages: English
• ISSNs: 0360-1234

Abstract

Abstract: Animal manures usually contain high contents of heavy metals (HMs) and thus pose a considerable threat to human health and environment when applied to soil. In this study, the effect of pyrolysis temperature (300 °C, 400 °C, 500 °C, 600 °C, and 700 °C) on the properties of biochar produced from chicken manure was studied. In addition, the response of speciation, bioavailability, leachability, and environmental risk of HMs in biochar to different pyrolysis temperature was investigated. The results showed that biochars pyrolyzed at high temperatures generally had high pH, ash content, surface area, and stability. As the pyrolysis temperature increased, the total concentrations of Cu, Zn, Cr, and Ni continually increased, whereas those of Pb and Cd initially increased and then decreased. Moreover, the transformation of the bioavailable fractions of HMs into stable fractions obviously increased with increasing pyrolysis temperature. Thus, pyrolysis at high temperature led to a further decrease in the bioavailability, leachability, and environmental risk of six HMs, as shown by DTPA, TCLP, and the potential ecological risk index. Overall, it is convincing that that 700 °C is the optimal temperature when considering the quality and environmental safety of biochar derived from chicken manure.