The migration and transformation behavior of heavy metals during co-liquefaction of municipal sewage sludge and lignocellulosic biomass

Lijian Leng, Songqi Leng, Jie Chen, Xingzhong Yuan, Jun Li, Kun Li, Yunpu Wang, Wenguang Zhou

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Co-liquefaction of municipal sewage sludge (MSS) and heavy metal (HM) contaminated lignocellulosic biomass (rice straw or wood sawdust) was conducted at 300 °C with ethanol as the solvent to study the transformation behavior of HMs (e.g., Cu, Cd, Pb, Cr, Zn, and Ni). The results indicate that HMs in rice straw or wood sawdust transferred heavily to bio-oils (up to 10–25% of the total Cu, Cd, and Zn) when they were liquefied individually, compared with MSS with only ∼5% distributed to bio-oil. The bio-available fraction of HMs in bio-chars and bio-oils produced from liquefaction of individual biomass were assessed to show medium to high risk to the environment. Co-liquefaction promoted the distribution of HMs to solid bio-char. Moreover, co-liquefaction benefited the immobilization of HMs in bio-chars and bio-oils. Synergistic effects were found for HMs immobilization during co-liquefaction.

Original languageEnglish (US)
Pages (from-to)156-163
Number of pages8
JournalBioresource Technology
Volume259
DOIs
StatePublished - Jul 2018

Keywords

  • Co-liquefaction
  • Distribution behavior
  • Heavy metal
  • Lignocellulosic biomass
  • Sewage sludge

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