Abstract
In the decolorization treatment of molasses wastewater by electrolysis, the effect of anode material on the decolorization efficiency (η) was studied. Five soats of anode material, which are PdO, PbO2, IrO2, Pt and graphite, were certified under the electrolysis condition of wastewater from an alcohol distillery with 5% NaCl. PdO was the most effective anode. η with PdO was 750U·l·kC-1 three times larger than η with Pt, and η with graphite was 470U·l·kC-1. In order to study for practical use, the pilot scale electrolysis reactor was made with a graphite anode and a stainless steel cathode. When methane fermentation was used for pre-treatment and the treated water diluted with sea water, η was obtained the highest value. The energy balance of the glutamate wastewater treatment system which was conbined a methane fermentation, electrolysis decolorization and co-generation was estimated. The recovery electric energy from co-generation was calculated as 75% of the required electric energy for electrolysis decolorization.
