Cumulative effects of bamboo sawdust addition on pyrolysis of sewage sludge: Biochar properties and environmental risk from metals

Junwei JIN, Minyan WANG, Yucheng CAO, Sheng Chun WU, Peng LIANG, Yanan LI, Jianyun ZHANG, Jin ZHANG, Ming Hung WONG, Shengdao SHAN, Peter CHRISTIE

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50 Citations (Scopus)

Abstract

A novel type of biochar was produced by mixing bamboo sawdust with sewage sludge (1:1, w/w) via a co-pyrolysis process at 400 - 600 °C. Changes in physico-chemical properties and the intrinsic speciation of metals were investigated before and after pyrolysis. Co-pyrolysis resulted in a lower biochar yield but a higher C content in the end product compared with use of sludge alone as the raw material. FT-IR analysis indicates that phosphine derivatives containing P-H bonds were formed in the co-pyrolyzed biochars. In addition, co-pyrolysis of sludge with bamboo sawdust transformed the potentially toxic metals in the sludge into more stable fractions, leading to a considerable decrease in their direct toxicity and bioavailability in the co-pyrolyzed biochar. In conclusion, the co-pyrolysis technology provides a feasible method for the safe disposal of metal-contaminated sewage sludge in an attempt to minimize the environmental risk from potentially toxic metals after land application. Copyright © 2016 Elsevier Ltd.
Original languageEnglish
Pages (from-to)218-226
JournalBioresource Technology
Volume228
Early online dateDec 2016
DOIs
Publication statusPublished - Mar 2017

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Sawdust
Bamboo
Sewage sludge
bamboo
environmental risk
pyrolysis
Pyrolysis
Metals
metal
phosphine
Poisons
sludge
Waste disposal
Chemical properties
bioavailability
Toxicity
chemical property
Raw materials
biochar
effect

Citation

Jin, J., Wang, M., Cao, Y., Wu, S., Liang, P., Li, Y., et al. (2017). Cumulative effects of bamboo sawdust addition on pyrolysis of sewage sludge: Biochar properties and environmental risk from metals. Bioresource Technology, 228, 218-226.

Keywords

  • Sewage sludge
  • Bamboo sawdust
  • Pyrolysis
  • Trace metals
  • Potential environmental risk assessment