Abstract
The combination of fungal pre-treatment with Trametes pubescens and anaerobic digestion were tested for the removal of chemical oxygen demand (COD) and phenolic compounds from wine distillery wastewater. The COD removal efficiency after fungal pre-treatment reached 53.3%. During digestion, pH buffering was achieved using CaCO3 and K2HPO4. This provided a stable environment inside digester for efficient and time-independent COD removal. The total COD removal efficiency reached 99.5%, and the system proved able to eliminate shock COD loads, as indicated by the concentrations of sludge and volatile fatty acids. Complex changes of phenolic compounds are suspected in anaerobic digestion system, and are investigated further.
Highlights
Wine distilleries produce limited volumes of high-strength wastewater during the wine season (Nogales et al, 2005)
Most distilleries practise biological treatment of their wastewaters using either anaerobic or aerobic conditions, both of which lead to reduction in biological oxygen demand (BOD) and chemical oxygen demand (COD) (Pandey et al, 2003)
Nollet and Verstraete (2004) reported that during anaerobic digestion reductive acetogens and methanogens compete for H2 as a substrate
Summary
Wine distilleries produce limited volumes of high-strength wastewater during the wine season (Nogales et al, 2005). Fungi have been used effectively as a pre-treatment for anaerobic digestion of other materials with high phenolic content, such as molasses and olive mill wastewater (Lacina et al, 2003). Fungal pre-treatment under aerobic conditions makes it possible to obtain 51 100% phenol removal; good decolourisation (31 - 100%);
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