Detoxification and discoloration of Moroccan olive mill wastewater by electrocoagulation

The objective of the present study was to assess the electrocoagulation treatment of olive mill wastewater using an aluminum electrode. We have examined the effect of the following parameters on the removal of chemical oxygen demand (COD), polyphenols and dark color removal efficiency: Electrolysis...

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Vydáno v:Journal of hazardous materials Ročník 174; číslo 1; s. 807 - 812
Hlavní autoři: Hanafi, F., Assobhei, O., Mountadar, M.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Kidlington Elsevier B.V 15.02.2010
Elsevier
Témata:
Applied sciences
Biological and medical sciences
Color
Dark color
Electrochemistry - methods
Electrocoagulation
Exact sciences and technology
Food engineering
Food industries
Fundamental and applied biological sciences. Psychology
General aspects
General purification processes
Hydrogen-Ion Concentration
Industrial Waste
Morocco
Olive mill wastewater
Olive Oil
Plant Oils - chemistry
Pollution
Polyphenols
Toxicity
Wastewaters
Water treatment and pollution
Morocco
Polyphenols
Olive mill wastewater
Dark color
Electrocoagulation
Toxicity
Discoloration
Electrochemical treatment
Color
Detoxification
Density
Operating conditions
Waste water
Electrodes
Electrolysis
Chemical oxygen demand
Chlorides
Food industry
Water quality
pH
Physicochemical purification
ISSN:0304-3894, 1873-3336, 1873-3336
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Shrnutí:The objective of the present study was to assess the electrocoagulation treatment of olive mill wastewater using an aluminum electrode. We have examined the effect of the following parameters on the removal of chemical oxygen demand (COD), polyphenols and dark color removal efficiency: Electrolysis time, Current density, Chloride concentration and Initial pH. The olive mill wastewater (OMW) – diluted 5 times – used in this study had 20.000 mg/L chemical oxygen demand, 3.6 mS/cm conductivity and acidic pH (4.2). It also contains considerable quantities of polyphenols (260 mg/L). The evolution of the physico-chemical parameters during the treatment by electrocoagulation showed that under the following conditions: electrolysis time 15 min, NaCl concentration 2 g/L, initial pH 4.2 and current density 250 A/m 2, the discoloration of the olive mill wastewater, the reduction of the chemical oxygen demand and the reduction of polyphenols exceeded 70%, the electrodes consumption was 0.085 kg Al/kg COD removed and the specific energy consumed was 2.63 kWh/kg COD removed. Under these optimal experimental conditions, olive mill wastewater became non-toxic for Bacillus cereus.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0304-3894
1873-3336
1873-3336
DOI:10.1016/j.jhazmat.2009.09.124