Continuous flow electrocoagulation in the treatment of wastewater from dairy industries

Dairy industry wastewater contains high levels of organic matter, consisting mainly of fat, protein and products of their partial microbial decomposition. In the present study, the use of continuous electrocoagulation is proposed for the primary treatment of dairy wastewater. The electrochemical tre...

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Bibliographic Details
Published in:Water science and technology 2016-03, Vol.73 (6), p.1418-1425
Main Authors: Benazzi, Toni L, Di Luccio, Marco, Dallago, Rogério M, Steffens, Juliana, Mores, Rúbia, Do Nascimento, Mariele S, Krebs, Jociane, Ceni, Gustavo
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Aluminum - chemistry
Aqueous solutions
Biological Oxygen Demand Analysis
Carbon
Charged particles
Chemical oxygen demand
Chemical treatment
Color
Color removal
Colour
Continuous flow
Current density
Dairy industry
Dairy industry wastewaters
Dairying
Desalination
Distance
Efficiency
Effluents
Electric potential
Electrochemical Techniques
Electrochemistry
Electrocoagulation
Electrodes
Environmental protection
Hydrogen-Ion Concentration
Industry
Investigations
Microorganisms
Milk
Organic carbon
Organic matter
Oxygen demand
Proteins
Removal
Residence time
Residential density
Steady state
Total organic carbon
Turbidity
Voltage
Waste Disposal, Fluid - methods
Waste Water - chemistry
Wastewater
Wastewater treatment
Water treatment
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Summary:Dairy industry wastewater contains high levels of organic matter, consisting mainly of fat, protein and products of their partial microbial decomposition. In the present study, the use of continuous electrocoagulation is proposed for the primary treatment of dairy wastewater. The electrochemical treatment was carried out in a continuous flow cell with aluminum electrodes. The influence of the voltage, the distance between the electrodes and the hydraulic residence time (HRT) on the process performance was assessed, by measuring the removal of color, turbidity, total organic carbon (TOC) and chemical oxygen demand (COD). The optimum voltage, distance between the electrodes and HRT were 10 V, 1 cm and 90 min, respectively, yielding a current density of 13.3 A.m(-2). Under these conditions, removal of color, turbidity, TOC and COD were 94%, 93%, 65% and 69%, respectively, after a steady state was reached in the continuous flow reactor.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2015.620