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Treatment of dairy industry wastewater by EC and EF processes using hybrid FeAl plate electrodes
Author(s) -
Yavuz Yusuf,
Öcal Eren,
Koparal Ali Savaş,
Öğütveren Ülker Bakır
Publication year - 2011
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.2607
Subject(s) - chemical oxygen demand , effluent , electrolysis , wastewater , chemistry , electrochemistry , electrolyte , organic matter , biochemical oxygen demand , pulp and paper industry , electrode , environmental engineering , environmental science , organic chemistry , engineering
BACKGROUND: In this study electrochemical treatment of dairy industry wastewater (DW) was investigated using a combined electrode system consisting of iron and aluminum as sacrificial electrodes. The dairy industry generates strong wastewaters characterized by high biological oxygen demand and chemical oxygen demand concentrations. Dairy industry waste effluents are concentrated in nature, and the main contributors of organic load to these effluents are carbohydrates, proteins and fats originating from the milk. Since dairy waste streams contain high concentrations of organic matter, these effluents may cause serious environmental problems. RESULTS: A pole changer device was employed to change polarization in given time intervals to generate iron and aluminum based coagulants respectively. The effects of current density, initial pH, sodium sulfate (Na 2 SO 4 ) and H 2 O 2 concentrations on the removal efficiency were investigated. The best experimental conditions obtained in electrochemical studies were as follows: current density = 15 mA cm −2 , natural pH, without supporting electrolyte addition, H 2 O 2 concentration = 3 × 1000 mg L −1 . Under these conditions, 79.2% COD removal from DW was achieved. CONCLUSION: According to the results, 20 min electrolysis is enough, since insignificant variations in COD removal were observed after this time. These methods were found to be successful for the treatment of DW. Copyright © 2011 Society of Chemical Industry