Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/65910
Title: Innovative solidification/stabilization of lead contaminated soil using incineration sewage sludge ash
Authors: Li, J
Poon, CS
Keywords: Incineration sewage sludge ash
Leachability
Lead contaminated soil
Solidification/stabilization
Issue Date: 2017
Publisher: Pergamon Press
Source: Chemosphere, 2017, v. 173, p. 143-152 How to cite?
Journal: Chemosphere 
Abstract: The proper treatment of lead (Pb) contaminated soils and incinerated sewage sludge ash (ISSA) has become an environmental concern. In this study, ordinary Portland cement (OPC) and blended OPC containing incinerated sewage sludge ash (ISSA) were used to solidify/stabilize (S/S) soils contaminated with different concentrations of Pb. After curing for 7 and 28 d, the S/S soils were subjected to a series of strength, leaching and microscopic tests. The results showed that replacement of OPC by ISSA significantly reduced the unconfined compressive strength (UCS) of S/S soils and leached Pb. In addition, the leaching of Pb from the monolithic samples was diffusion controlled, and increasing the ISSA addition in the samples led to a lower diffusion coefficient and thus an increase in the feasibility for “controlled utilization” of S/S soils. Furthermore, the proposed S/S method significantly decreased the amount of Pb associated with carbonates and increased the amount of organic and residual Pb in S/S soils, reflecting that the risk of Pb contaminated soils can be effectively mitigated by the incorporating of ISSA. Overall, the leachability of Pb was controlled by the combined effect of adsorption, encapsulation or precipitation in the S/S soils.
URI: http://hdl.handle.net/10397/65910
ISSN: 0045-6535
EISSN: 1879-1298
DOI: 10.1016/j.chemosphere.2017.01.065
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