Health & Environmental Research Online (HERO)


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361100 
Journal Article 
Treatment of heavy metals from wastewater containing EDTA with sulfide precipitation 
Lei, M; Tanaka, M; Liao, B; Tie, B; Qin, P 
2008 
150-154 
On the base of analysis of species distributions of heavy metals in solutions with MINTEQA2 computer programme, Na2S addition was used to remove metals from waste water containing EDTA solution. Results showed that metal ion Cd2+, Cu2+, Pb2+, and Zn2+ were the main species in the simulated waste water without EDTA solution. However, metal-EDTA was found to be the predominant fraction among metal species in the simulated waste water with EDTA solution. Heavy metals Cd2+, Cu2+, Pb2+ were precipitated completely by low concentration of Na2S from without EDTA solution, and 57.0% of Zn2+ was removed. The precipitation percentages of heavy metals decreased with increasing EDTA concentration. However, the removal of heavy metals increased with increasing Na2S concentration. At the same condition, the precipitation percentages of Zn by Na2S addition were lower than those of other metals. According to engineering experimental results, metals and EDTA were separated efficiently by Na2S addition from the extraction solution. However, high concentration of Na2S was required to remove all the metals including Zn. 
cadmium; copper; EDTA; heavy metals; lead; removal; spatial distribution; sulfides; waste water; waste water treatment; zinc; edetic acid; ethylenediaminetetraacetic acid; sulphides; Water Resources (PP200); Industrial Wastes and Effluents (XX400)