3. 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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8. WASTES FROM SUGAR INDUSRY
ARE….
Sugarcane tops
Bagasse
Molasses
Press mud
Waste water
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9. 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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10. 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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11. Mainly used for
Paper production
Ethanol production
Electricity/cogeneration
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12. Paper production from bagasse
Bagasse
Dewatering pulp thickening
Cooking bleaching
Pulp washing paper
Pulp screening
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13. Ethanol production from bagasse
Bagasse
Pre-treatment by acid/steam
hydrolysis
fermentation(30⁰C for 36-48 hr)
distillation
ethanol
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14. 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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15. 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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16. BIO ETHANOL FROM MOLASSES
Molasses
Distillation
Gelatinization
Refining
hydrolysis
bio ethanol
Fermentation(at 30⁰C for 36-40 hr)
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17. 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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18. 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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