Decolorization and chemical oxygen demand (COD) reduction of sugarrefinery spent Ion-Exchange-Process (SIEP) effluent by electrochemicaltreatment methods

Issue Date

12-2008

Abstract

The application of electrochemical processes, namely electro-oxidation and electrocoagulation, intreating spent ion-exchange-process (SIEP) effluent from a local sugar refinery was investigated. TheSIEP effluent had chemical oxygen demand (COD) content greater than 10,000 mg L-1, high color(>10,000 PCU) and high salinity (about 35,000 mg L-1). Electrolysis experiments were conducted atdifferent operating currents, and removal efficiencies for color, total suspended solids (TSS) and CODwere evaluated. Electro-oxidation at 5 A for 7 h achieved 99.9 % decolorization, 63.1% COD reductionand 90.5% TSS removal. Electrocoagulation at 5 A for 8 h resulted in 71.2% decolorization, 18.5 % CODreduction and 97.4% TSS removal. Comparison of the treatment processes yielded electro-oxidationas the better treatment option, as it gave the highest decolorization and COD removal efficiency.Moreover, the color, TSS and pH values were within the Department of Environment and Natural Re-sources (DENR) standards for Class C waters. Energy cost was also lower than that for electrocoagu-lation, requiring about PhP 740 per m3 of effluent (for operating voltage of 5 volts). © Published by the College of Agriculture.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Volume

91

Issue

4

Page

416-425

Document Type

Article

Language

English

Subject

COD, Decolorization, Electro-oxidation, Electrocoagulation, Spent ion-exchange-process effluent

Digital Copy

None

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