waste utilization in sugarmills

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waste utilization in sugarmills

  1. 1. 1
  2. 2. BY GEETHU S 2011-06-007 Kelappaji college of agricultural engineering and technology,tavanur,malappuram 2
  3. 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 3
  4. 4. Fig: layout of sugar mill 4
  5. 5. SUGAR FROM SUGARCANE HARVESTING CRUSHING JUICE FILTRATION BOILING OF JUICE 5
  6. 6. Cont….. SYRUP TREATMENT CRYSTALLIZATION CENTRIFUGATION STORAGE 6
  7. 7. Fig: sugar cane crushing operation 7
  8. 8. WASTES FROM SUGAR INDUSRY ARE…. Sugarcane tops Bagasse Molasses Press mud Waste water 8
  9. 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 9
  10. 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 10
  11. 11. Mainly used for  Paper production  Ethanol production  Electricity/cogeneration 11
  12. 12. Paper production from bagasse Bagasse Dewatering pulp thickening Cooking bleaching Pulp washing paper Pulp screening 12
  13. 13. Ethanol production from bagasse Bagasse Pre-treatment by acid/steam hydrolysis fermentation(30⁰C for 36-48 hr) distillation ethanol 13
  14. 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. 14
  15. 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 15
  16. 16. BIO ETHANOL FROM MOLASSES Molasses Distillation Gelatinization Refining hydrolysis bio ethanol Fermentation(at 30⁰C for 36-40 hr) 16
  17. 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 17
  18. 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. 18
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