engleski

Printing Ink Industry Waste Sludge Bentonit Treatment

The pape r examines pretreatment of wastewater, from the water-based printing ink production, with bentonites. Bentonites, as a natural and cheap treatment material were chosen because of the planned final treatment of residuals. The research has been performed for two different types of water-based printing inks and on both the monochrome and polychrome models. The efficiency of different bentonite types and their concentration ranges, system optimum pH range, influence of the ink composition and complexity, and the influence of the filter media were investigated. The achieved results were very positive, confirming the wastewater decoloring in a relatively broad concentration range of bentonites. A reduction in COD and TOC values by 99 percent has been achieved, allowing the treated water to be used in the process for cleaning purposes of discharged into a natural recipient. After treatment, the percipitates were thermally treated in conditions similar to ones in the brick furnace and the behaviour of model samples investigated. The results obtained indicate thet the initial quantity of highly polluted waste could be reduced by 97.5 percent and the residual 2.5 percent could be successfully managed by mixing it into the raw material for the brick production.

bentonites; COD/TOC reduction; decolouring; printing ink industry; waste treatment; water-based printing inks

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