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Assessment of various physiochemical treatments for the removal of dissolved and colloidal substances present in the TMP/Newsprint white waters and fungal enzymatic treated white water Soong, George

Abstract

This study has assessed the effects of using hydrogen peroxide, Fenton's reagent treatment and alum coagulation on the removal of organic dissolved and colloidal substances (DCS) from TMP/Newsprint cloudy white water (MWW), fungal cultural filtrate (FCF) and fungal enzymatic treated white water (FWW). It was shown that employing hydrogen peroxide did not significantly remove the colour, even i f a high dosage (2% by wt/wt) of hydrogen peroxide was employed. Both the Fenton's reagent treatment and alum coagulation were effective in reducing detrimental components present in both the fungal cultural filtrate and the fungal enzymatic treated white water, without the requirement of either pH adjustment or the need for changed temperature. We confirmed that fungal enzymatic treatment played a key role in enhancing these two posttreatments. The presence of chelating agents was shown to be the major inhibitor of successful Fenton's reagent treatment of the MWW and FWW. The percentage removal of colour and of organic DCS components were increased up to 90% and 92% respectively of the Fenton's reagent treatment. When using alum coagulation, the removal rates of lignin, extractives and colour were 95%, 85% and 95% respectively. The zeta potential was shown to be the most dominant factor which affected efficient precipitation. The supernatants obtained after each of the treatments were virtually clear and only slightly coloured when compared to the original MWW and FWW samples.

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