Effect of water-washing on the co-removal of chlorine and heavy metals in air pollution control residue from MSW incineration

Zhenzhou Yang, Sicong Tian, Ru Ji, Lili Liu, Xidong Wang, Zuotai Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The present study systemically investigated the effect of a water-washing process on the removal of harmful chlorides, sulfates, and heavy metals in the air pollution control (APC) residue from municipal solid wastes incineration (MSWI), for sake of a better reuse and disposal of this kind of waste. In addition, the kinetic study was conducted to reveal the releasing mechanism of relevant element in the residue. The results show that, over 70 wt.% of chlorides and nearly 25 wt.% of sulfates in the residue could be removed by water washing. Based on an economical consideration, the optimal operation conditions for water washing of APC residue was at liquid/solid (L/S) ratio of 3 mL:1 g and extracting time of 5 min. As expected, the concentrations of Co, Cr, Fe, Ni, V and Cu in the washing effluent increased with time during the washing process. However, the extracting regime differs among different heavy metals. The concentrations of Ba and Mn increased firstly but declined afterwards, and concentrations of Pb and Zn gradually declined while Cd and As kept constant with the increase of extracting time. It is worth mentioning that the bubbling of CO2 into the washing effluent is promisingly effective for a further removal of Pb, Cu and Zn. Furthermore, kinetic study of the water washing process reveals that the extracting of heavy metals during water washing follows a second-order model.

Original languageEnglish
Pages (from-to)221-231
Number of pages11
JournalWaste Management
Volume68
DOIs
Publication statusPublished - 1 Oct 2017
Externally publishedYes

Keywords

  • APC residue
  • Chloride
  • Heavy metal
  • Kinetic study
  • Water washing

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