29-01-2013, 04:44 PM
Electrocoagulation and Coagulation of Distillery Spent Wash Effluent
Electrocoagulation.ppt (Size: 3.29 MB / Downloads: 67)
Distillery Industry
India is the fourth largest producer of ethanol in the world and the second largest in Asia.
India produces about 3.25 billion litres of alcohol annually.
Applications of ethanol
Potable liquor (spirit and beverage)
Industrial alcohol (drugs, rubber, pesticides, solvents, pharmaceutical and flavouring)
Water Pollution Problems in Distillery Industry
The distilleries are listed at the top in the “Red Category” industries having a high polluting potential.
There are 319 distilleries in India producing 3.25 billion litres of alcohol and generating 40 billion litres of spentwash annually
Spentwash
Waste water (spent wash) generated by distilleries during the distillation and fermentation of molasses to ethyl alcohol using specific strains of yeast.
A dark brown coloured liquid
Containing residual nutrients from sugarcane and yeast cells
Does not contain any heavy metals or other toxic residues
Advantages of EC
Generate less quantity of sludge
Avoids the use of chemicals
Floatation for oily and grease contaminants
Less maintenance is required.
Conclusions
Electrocoagulation can be a suitable treatment option after Biomethanation of distillery effluent.
99% COD removal efficiency was obtained at an electrolysis time of 2 hr by Al-Al electrodes.
The COD removal efficiency obtained by electrocoagulation is much higher as compared to chemical coagulation technique.
The maximum COD of 22 % was obtained at a pH of 8.2 with a coagulant dose of 5 g/300 mL of BDS solution.