Journal
WATER RESEARCH
Volume 43, Issue 16, Pages 3999-4009Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2009.04.007
Keywords
Boron-doped diamond; Electrolysis; Factorial design; Olive mill wastewater; Biodegradability
Funding
- National and Community Funds (75% from E.U. - European Social Fund and 25% from the Greek Ministry of Development General Secretariat of Research and Technology) [03ED391 research project, implemented within the framework of the Reinforcement Programme of Human Research Manpower (PENED) and co-financed by]
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The electrochemical treatment of olive mill wastewaters (OMW) over boron-doped diamond (BDD) electrodes was investigated. A factorial design methodology was implemented to evaluate the statistically important operating parameters, amongst initial COD load (1000-5000 mg/L), treatment time (1-4 h), current intensity (10-20 A), initial pH (4-6) and the use of 500 mg/L H2O2 as an additional oxidant, on treatment efficiency; the latter was assessed in terms of COD, phenols, aromatics and color removal. Of the five parameters tested, the first two had a considerable effect on COD removal. Hence, analysis was repeated at more intense conditions, i.e. initial COD values up to 10,000 mg/L and reaction times up to 7 h and a simple model was developed and validated to predict COD evolution profiles. The model suggests that the rate of COD degradation is zero order regarding its concentration and agrees well with an electrochemical model for the anodic oxidation of organics over BDD developed elsewhere. The treatability of the undiluted effluent (40,000 mg/L COD) was tested at 20 A for 15 h yielding 19% COD and 36% phenols' removal respectively with a specific energy consumption of 96 kW h/kg COD removed. Aerobic biodegradability and ecotoxicity assays were also performed to assess the respective effects of electrochemical treatment. (C) 2009 Elsevier Ltd. All rights reserved.
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