Abstract
Pigments in molasses wastewater (MWW) effluent, such as melanoidins, were considered as kinds of the most recalcitrant and hazardous colorant contaminants to the environment. In this study, de-coloring the MWW by a synergistic combination of micro-electrolysis with bio-treatment was performed. Aiming to a high de-colorization yield, levels of nutrition source supplies, MWW dilution ratio, and micro-electrolysis reaction time were optimized accordingly. For a diluted (50 %, v/v) MWW, an maximum overall de-colorization yield (97.1 ± 0.5 %, for absorbance at 475 nm) was achieved through the bio-electrolysis treatment. In electrolysis bio-treatment, the positive effect of micro-electrolysis was also revealed by a promoted growth of fungal biomass as well as activities of ligninolytic enzymes. Activities of lignin peroxidase, manganese peroxidase, and laccase were promoted by 111.2, 103.9, and 7.7 %, respectively. This study also implied that the bio-treatment and the micro-electrolysis had different efficiencies on removal of pigments with distinct polarities.
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The authors acknowledge the financial support from National Natural Science Foundation of China (Grant Numbers: 51338010, 21107125 and 51221892).
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X. Tian co-first author.
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Chen, B., Tian, X., Yu, L. et al. Removal of pigments from molasses wastewater by combining micro-electrolysis with biological treatment method. Bioprocess Biosyst Eng 39, 1867–1875 (2016). https://doi.org/10.1007/s00449-016-1661-2
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DOI: https://doi.org/10.1007/s00449-016-1661-2