Abstract
We demonstrate here, in a laboratory scale experiment, the feasibility of using the base/acid pair Ca(OH)2/H2SO4 to impose a pH gradient for EDTA recycling and, coupled with an electrochemical advanced oxidation process using a graphite anode, of recycling process water as part of a novel remediation technology for multi-metal contaminated soils. In the first batch, 60mmolEDTAkg−1 of soil removed 72, 27, and 71% of Pb, Zn, and Cd, respectively, from soil contaminated with 5329±685, 3401±193, and 35±6mgkg−1 of Pb, Zn, and Cd, respectively. In the subsequent four batches, we demonstrated that up to 88% of EDTA was recycled from each batch, with the potential to extract up to 98, 94, and 109% of Pb, Zn, and Cd, respectively, that the fresh EDTA extracted. Accumulation of salts in the process water through multiple remediation batches/recycles was prevented by CaSO4 precipitation. Recycled process water toxicity testing indicated no significant effect on plant seed germination but some inhibition of root elongation.
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