期刊
CHEMICAL ENGINEERING JOURNAL
卷 242, 期 -, 页码 269-277出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.01.003
关键词
Melanoidin; Coagulation/flocculation; Sludge re-use; Electro-coagulation/electro-flotation; ADMI; COD
资金
- European Union
- Greek State Program EPAN-II (OPC-II)/ESPA (NSRF): 'SYNERGASIA II', Project (MOL-TREAT) - Integrated treatment of high molasses wastewater for recovery of high added value products and reduction of pollutant loading [11SYN-8-699]
Melanoidins are brown recalcitrant bio-polymers present in the effluents of fermentation processes due to their antioxidant properties. In this study, removal of melanoidin from simulated and real wastewaters (biologically treated and untreated) was investigated by coagulation/flocculation. The studied operating variables, based on the maximum removal of color expressed in ADMI units, were coagulant concentration, pH, mixing time and sludge re-use. The results show that coagulation experiments could achieve color removal 90% and higher, at pH = 5, for all wastewaters but with different ferric ion dose. Real effluents could be discolored by 100 mM [Fe3+], while simulated by 300 mM [Fe3+]. After flocculation, the generated ferric hydroxide sludge was washed, solubilized and re-used effectively in a new run. Melanoidin removal was also studied by electro-flotation. Color removal was 95%, 90% and 45% for real treated, real untreated and simulated wastewaters by applying 0.5 A current intensity. Furthermore, coagulation can reduce significantly the COD content of real effluents. (C) 2014 Elsevier B.V. All rights reserved.
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