Operational control on environmental safety of potentially toxic elements during thermal conversion of metal-accumulator invasive ragweed to biochar

Yousaf B., Liu G., Abbas Q., Ali M. U., Wang R., Ahmed R., ...Daha Fazla

JOURNAL OF CLEANER PRODUCTION, cilt.195, ss.458-469, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 195
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.jclepro.2018.05.246
  • Dergi Adı: JOURNAL OF CLEANER PRODUCTION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.458-469
  • Anahtar Kelimeler: Thermal conversion, Metal-accumulating invasive ragweed, Biochar characteristics, Environmental risk, Potentially toxic elements, TEMPERATURE-INDUCED CHANGES, HUMAN HEALTH-RISKS, HEAVY-METALS, PYROLYSIS TEMPERATURE, HYDROTHERMAL TREATMENT, SLOW PYROLYSIS, SEWAGE-SLUDGE, BIOMASS, MIGRATION, CARBON
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

Ragweed (Ambrosia artemisiifolia L), a metal-accumulator invasive species, was pyrolyzed under a range of pyrolytic conditions to investigate their influence on immobilization and environmental safety of potentially toxic elements (PTEs) in the produced biochar. Conditions tested included temperature, retention time, heating rate, gas flow rate and particle size. Temperature and particle size had pronounced effects on product yields and physico-chemical characteristics of the produced biochar. All PTEs were enriched in the biochar, and the effect was more pronounced with higher temperature over 500 degrees C. However, fractionation of PTEs in biochar by following the sequential extraction process indicates that the mobile (bioavailable) fraction of most of the PTEs was transformed into more stabilized (residual) form (P < 0.01) after thermal conversion. Conclusively, biochar from metal-accumulating invasive ragweed with sustainable disposal and desired characteristics (with an optimal temperature range of a 500-600 degrees C and heating rate of 10 min(-1) using smaller-size particle) can be produced by an appropriate combination of different pyrolytic condition with low environmental and ecological risk. (C) 2018 Elsevier Ltd. All rights reserved.