Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 2, Issue 4, Pages 1969-1979Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2014.08.017
Keywords
EDDS; Soil washing; Metal removal; Solar photocatalysis; Photo-Fenton
Categories
Funding
- European Project (ECOREMED) [LIFE11 ENV/IT/000275]
- Brazilian National Counsel of Technological and Scientific Development (CNPq) [201106/20122014]
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Metal contamination of natural soil is a global problem. In many cases the contamination is due to anthropogenic activities, and, sometimes, it comes from illegal waste disposal due to uncontrolled industrial development. One of the ways of solving metal soil contamination is by soil washing using a chelating biodegradable agent (EDDS). However, the resulting liquid wastes that contain the extracted metals and chelating agents have to be submitted to further treatments for a complete detoxification before being discharged into the environment. The simultaneous removal of EDDS and three metals (Cu, Fe and Zn) from both synthetic waters (home prepared) and real contaminated soil washing mixtures at neutral pH has been investigated, a lab-scale, considering four artificial solar driven photocatalytic technologies (TiO2/h nu/N-2, TiO2/h nu/air, Fe(III)-EDDS/hn/air and Fe(III)-EDDS/h nu/H2O2/air). The soils were sampled in the Province of Naples (South of Italy) in a zone infamously known for its high incidence of cancer mortality. The results indicate that both the type and the sequence of photocatalytic technologies that need to be apply should be chosen prudently considering both the nature and the content of the soil washing solutions. (C) 2014 Elsevier Ltd. All rights reserved.
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