Stabilization of multiple heavy metal contaminated soils using discarded crab shell

Zhejiang Environmental Science & Design institute, Hangzhou, Zhejiang, 310007, China

Abstract

Stabilizing heavy metal contaminated soil is a popular remediation model in China. Many waste biomass materials have been proven to have a stabilizing effect on heavy metals but also have several advantages like environmental friendliness and waste utilization. In this study, the waste crab shells were selected as raw materials for stabilizing agents, and the stabilization effects on different heavy metals after incineration and pyrolysis treatment was explored. The obvious stabilizing effect of pyrolytic crab shell powder on Cr and Cr⁶⁺ was observed, and the excellent stabilizing effect of the incinerated crab shell powder on Cu, Zn, Pb, Ni was also confirmed. After mixing the two crab shells, the overall stabilization effect of Cr and Cr⁶⁺, Cu, Zn, Pb, Ni and other heavy metals can reach the desired level (The stabilization efficiency of Cr, Cr⁶⁺, Cu, Zn, Pb, Ni was 89.0%, 89.1%, 93.3%, 86.1% and 96.1%,respectively).