waste utilization in sugarmills

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WELCOME

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WASTE MANAGEMENT IN

SUGAR MILLBY

GEETHU S2011-06-007

Kelappaji college of agricultural engineering and technology,tavanur,malappuram

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INTRODUCTION

Sugar mills produces range of by-products during the process of sugar extraction

Each tone of raw sugar produce seven tonnes of waste product. By-products include wastewater, molasses, bagasse, press mud These wastes are mainly used, to producing fuel, to generate

electricity, used as nutrients for plant

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Fig: layout of sugar mill

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SUGAR FROM SUGARCANEHARVESTING

CRUSHING

JUICE FILTRATION

BOILING OF JUICE

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Cont…..SYRUP TREATMENT

CRYSTALLIZATION

CENTRIFUGATION

STORAGE

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Fig: sugar cane crushing operation

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WASTES FROM SUGAR INDUSRY ARE….

Sugarcane topsBagasseMolassesPress mudWaste water

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SUGARCANE TOPS

It is mainly used for fuel production and animal feed. It contain 85% dry matter, 5.5% crude protein. Energy value – 7 MJ/Kg.

PROCESS

Sugarcane tops drying pelletizing animal feed

steam production

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BAGGASE

Fibrous residue left after crushing and extraction of the juice It contains fibre water and small quantity of soluble solids It contain cellulose - 45-55% hemicellulose - 20-25% lignin - 18-24% ash - 1-4% wax - <1% USES Lignin from bagasse is used in fibre industry Cellulose used as a material for manufacturing of pulp and paper Fuel for electricity production Charcoal producton

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Mainly used for

Paper production Ethanol production Electricity/cogeneration

12Paper production from bagasse

Bagasse

Dewatering pulp thickening

Cooking bleaching

Pulp washing paper

Pulp screening

13Ethanol production from bagasse Bagasse

Pre-treatment by acid/steam

hydrolysis

fermentation(30⁰C for 36-48 hr)

distillation

ethanol

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POWER GENERATION FROM BAGASSE

Sugar mills have been able to produce power in season as well as off season by using bagasse.

3500 MV bagasse based cogeneration potential in our country. It reduce the green house effect in terms of usage of biomass as

fuel.

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MOLASES

It is syrup left after the final stage of sugar extraction Obtained as the result of boiling of sugar cane juice Two type molasses – cane molasses and sugar beet molasses USES Production of bio ethanol Principle ingredient in distillation of rum As additives in livestock feed Source for yeast production

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BIO ETHANOL FROM MOLASSES

Molasses

Distillation Gelatinization

Refining hydrolysis

bio ethanolFermentation(at 30⁰C for 36-40 hr)

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PRESSMUD

It is the precipitated impurities obtained after the filtration of cane juice

It is mainly used as a fertilizer It contain 7% nitrogen and 1% phosphate In combination with molasses and fish meal in the proportion of

50:35:15 used as feed for cow

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WASTE WATER FROM SUGAR INDUSTRY

Anaerobic digestion, activated sludge treatment and trickling filtration methods are used for waste water treatment.

In anaerobic digestion the dissolved organic solids are transferred into methane , carbon dioxide, small amounts of other gasses

In trickling filtration and in activated sludge treatment the microbial population utilises oxygen dissolved in the wastewater to oxidise the dissolved organic matter to carbon di oxide and water.

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THANK YOU