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Friday 28 February 2020

Utilisation Of Spentwash In Crop Production



What are the concernes regarding waste generated by the Brewers & Distilleries in India ? Give us an idea regarding the same for Karnataka Brewers & Distillers.

In Karnataka there are 33 molasses based Distilleries and one grain based Distillery are producing about 40 crore litres of Spirit per annum and generating about 4000 million ltrs.of effluent.  This has high plant nutrient value, but if used indiscriminately could cause ground water and enviromental pollution.

What are the technologies used to treat the distillery spent wash and make it a suitable bio-compost ?

The residual sugar present in molasses is fermented using suitable micro organisms which is used for generating alcohol.  After distillation what remains behind is spent wash which has still lot of energy in the form of organic matter.  Therefore, the effluent is further used to generate methane gas in the process called bio-methanation.  Methane is used as source of energy, either for producing electricity or heating the boilers.  After this process of biomethanation, what remains is treated spentwash, which is further used as a rich source of plant nutrients either by directly applying to the crops in the field or after converting it to bio-compost.  For this purpose, another by-product of the sugar industry viz; press mud is used.

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