Industrial waste water refinement by precipitation treatment using dithiocarbamate: Changing process duration and pH effect on refinement efficiency
2007
Milenkov, Lj.,JKP Vodovod, Bor (Serbia) | Gardic, V.,Institut za bakar, Bor (Serbia) | Stankovic, S.,Institut za bakar, Bor (Serbia)
Stable complexes formation caused by usage of complexing agents as additive in plating solutions, made waste water treatment aggravated and expensive. The investigation results of samples that contain some cations expected in waste waters from this type of facilities, are presented in this paper. The precipitation of disolved heavy metals by neutralization, in the presence of strong chelators, do not give requested results. The dithiocarbamates are effective in complexing heavy metal ions forming insoluble compounds, with solubility far below that of the corresponding hydroxides. Inductively Coupled Plasma Optical Emission Spectroscopy is used for wastewater samples analysis. After the reduction of Cr6+ into Cr3+ ions and homogenization, dithiocarbamate is added. Modified neutralization process with unchanged retention time and pH 9.0 +/- 0.2 results the Law permitted wastewater quality.
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