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Better Sugar; Better Business Mill Issues and Co-Products BETTER SUGAR; BETTER BUSINESS MILL ISSUES AND CO-PRODUCTS M. Regis Lima Verde Leal WWF WORKSHOP - LONDON, JUNE 23-24, 2005 WORLD CROP LAND CROP AREA (MMHA) Sugar cane 20.1 Wheat 207.5 Rice 153.0 Maize 144.8 Soybeans 91.6 Notes: Rice - 42,5MMha in India and 29,4mmha in China Wheat - 27,3mmha in India and 21,7mmha in China Corn - 29,7MMha in USA and 25,6mmha in China Source: FAO, 2004 MAIN SUGAR CANE PRODUCERS COUNTRY AREA SUGAR CANE (1000HA) (1000 TONNES) Brazil 5,455 411,009 India 4,100 244,800 China 1,316 93,200 Thailand 1,050 63,707 Pakistan 1,049 52,040 Cuba 700 24,000 Mexico 639 45,126 Australia 415 36,892 Other 5,377 347,097 TOTAL 20,100 1,317,871 Source: FAO, 2004 BRAZILIAN CROP LAND AND PRODUCTION CROP AREA PRODUCTION (MMHA) (MM TONNES) Soy Beans 21.5 49.5 Corn 12.3 41.8 Sugar Cane 5.6 416.3 Beans 4.0 3.0 Rice 3.7 13.3 Wheat 2.8 5.7 Coffee 2.4 2.5 Other 5.7 - TOTAL 58.0 - Source: IBGE, 2004 BRAZIL LAND USE TYPE AREA (MMHA) Total Country 851 Brazilian Native Amazon 370 Secondary Amazon and other Native Forests 180 Planted Forests (cellulose and energy) 6 Pasture 197 Arable Land 59 Permanent Crop 7.6 Agricultural Area 263 Land for Crops/Low Impacts (*) 90 Source: FAO, 2002 and EMBRAPA (*) BRAZILIAN MODEL FOR SUGAR CANE INDUSTRY •JOINT PRODUCTION OF SUGAR AND ETHANOL 1990 2002 Sugar only mills 27 15 Ethanol distilleries 180 104 Sugar/Ethanol mills 168 199 Total 375 318 •LAND OWNERSHIP Mills = 65% Independent Cane Growers (70,000) = 35% •HARVESTING SEASON Center-South : May - November North-Northeast: September - March •MILL SIZE: <500.000 to 7.000.000 t/season PROCESS FLOW DIAGRAM BRAZILIAN PROCESS SUGAR CANE PROCESSING Clean Cane 1 1000kg Water Cane Waste 5000kg Washing Water Water: 65-75% 5000kg Sugars: 12-18% Fibers: 1-2% Embibition Bagasse Water Milling 280kg 300kg Mixed Juice 1.020kg Mixed Juice - Sugar Mixed Juice - Sugar 460kg 540kg SO2 <1kg Filter Cake Filter Cake Lime 27kg Water 47kg <1kg Juice treatment 27kg Juice treatment Phosphoric Acid for sugar Vapor Condensate for ethanol Vapor Condensate < 1kg 60kg 4 Vapor 70kg Water 70kg 23kg Treated Juice Vapor Treated Juice 458kg 60kg Syrap for 520kg Ethanol 3 Steam Vapor Condensate 280kg Must 170kg Evaporation 561kg Cooling Water Vapor 900kg 163kg 4 Steam Condensate Fermentation 230kg Waste Water 921kg Wine Syrap for sugar 619kg 73kg 2nd Ethanol 2kg Molasse Steam Fusel Oil 10kg 3 Dillution Water 217kg <1kg Condensate Distillation 3kg Vinasse Boiling 2kg Coolling Vapor Cristallization 540kg/490 l Vapor Condensate Water 33kg Drying Condensate 33kg 180kg Cooling Water Waste Water Steam Waste Water 3kg Sugar Hydrous Ethanol Anhydrous Ethanol 55kg 25kg/25 l 19kg/24 l SUGAR CANE PROCESSING Clean Cane 1 1000kg Water Cane Waste 5000kg Washing Water Water: 65-75% 5000kg Sugars: 12-18% Fibers: 1-2% Embibition Bagasse Water Milling 280kg 300kg Mixed Juice 1.020kg SUGAR CANE PROCESSING Mixed Juice - Sugar 460kg SO2 <1kg Filter Cake Lime 27kg <1kg Juice treatment Phosphoric Acid for sugar Vapor Condensate < 1kg 60kg Water 23kg Vapor Treated Juice 458kg 60kg Syrap for Ethanol 3 Steam Vapor Condensate 280kg 170kg Evaporation Cooling Water Vapor 900kg 163kg 4 Steam Condensate 230kg Waste Water 921kg Syrap for sugar 73kg Molasse 3 10kg Dillution Water Condensate 3kg Boiling 2kg Vapor Cristallization Vapor Condensate 33kg Drying 33kg Cooling Water Waste Water Steam 3kg Sugar 55kg SUGAR CANE PROCESSING Mixed Juice - Sugar 540kg Filter Cake Water 47kg 27kg Juice treatment for ethanol Vapor Condensate 4 Vapor 70kg 70kg Treated Juice 520kg Must 561kg Fermentation Wine 619kg 2nd Ethanol 2kg Steam Fusel Oil 217kg <1kg Distillation Vinasse Coolling 540kg/490 l Water Condensate 180kg Waste Water Hydrous Ethanol Anhydrous Ethanol 25kg/25 l 19kg/24 l ENERGY SYSTEM > 62 bar / > 450 ºC Bagasse 22 bar / 300 ºC Bagasse 0,12 bar 2,5 bar Process 2,5 bar Process Cooling Towers Season Condensate to boiler Year round ENVIRONMENTAL ISSUES ¾Water use ¾Boiler Emissions ¾Effluents ¾Cane burning WATER USE IN SUGAR MILLS TYPE FLOW POLLUTION TREATMENT NOTES (M3/TC) POTENTIAL Cane Washing 5 Organic matter, (180 to Settling ponds and pH 1 500mg/l BOD) adjustment (closed circuit); settling ponds stabilization ponds (open circuit) Barometric condenser 6 Organic matter (10 to 40mg/l Cooling pond (closed or open 2 BOD), temperature around circuit) to bring T < 40°C 50°C Fermented cooling 3 Temperature around 50°C Cooling pond (closed or open 2 circuit) Distillation condenser 4 Temperature around 50°C Cooling pond (closed or open 2 circuit) Waste water 4 Grease, oil, acid, caustic and Dilution in other water 3 sugar (all in very small streams, mix with vinasse quantities) Notes: 1 - Tendency to be discontinued or replaced by dry cleaning systems 2 - The circuits are being closed aiming zero leakage system 3 - Water from floor and equipment cleaning, spillage and other uses Source: CTC, A. Elias Neto, 1996 WATER USE IN SUGAR MILLS IN BRAZIL AVERAGE FIGURES ¾Water Intake : 3m3/tc ¾Consumption : 1.6 m3/tc ¾Discharge : 1.3 m3/tc Source: CTC, A. Elias Neto, 1996 PARTICULATE EMISSION STANDARDS FOR BAGASSE BOILERS COUNTRY STANDARD (mg/Nm3) Australia (1991) 450 Australia (1990, for new boilers) 250 Brazil (1996, for new boilers) 200 (*) South Africa (1991) 450 South Africa (1996, for new boilers) 120 Hawaii 870 India (1992, inclined grate boilers) 250 India (1992, spreader-stoker boilers) 800 Mauritius (1999) 400 Malaysia (1999) 400 World Bank (1997, for project funding) 100-150 Source: Joyce and Dixon, Lora and Jativa in O.D. Cheesman (*) To be approved TECHNOLOGIES TO CONTROL BOLLER PARTICULATE EMISSIONS CONTROL DEVICE EMISSION LEVEL (mg/Nm3) None 5 000 Multicyclone 1 500 Scrubber - Conventional 200 - Venturi type 100 Bag filter 80 Electrostatic precipitator 60 MAIN EFFLUENTS TYPE CARACHTERISTICS Vinasse (Brazil only) Corresponds to 10-15 l/liter of ethanol; high content of organic matter and minerals, recycled to cane fields for fertirrigation (N, K and OM). Filter Cake Waste from the clarifier mud filters, amounts to around 40kg/tc (30 to 80), used normally as fertilizer (N, P and OM); other uses possible. Boiler Ashes Both boiler bottom and fly ashes (from scrubbers) are mixed with solid effluents and recycled to the cane fields. Waste Water Resulting from floor washing, equipment cleaning, boiler blowdown, process stream spilling; should be treated to reduce BOD and COD and contaminant levels before being dumped in water bodies. Can be diluted in vinasse and used in fertirrigation. SUGAR CANE BURNING EMISSIONS (KG/t BURNED CANE) POLLUTANT DARLY AND ASOCANA SHEARRER EPA WHO LEARMAN, COLOMBIA, 1971 1977 1997 1995 (1) 1992 (1) (1) (2) (2) Particulate 3.6 2.8 1.26 2.5-3.5 8 CO 35.3 - 8.4 25-33 42 HC 5.2 - 1.68 2.0-6.6 15 NOX - - 0.17 - 3 Notes: (1) - Measured (2) - Estimated CO-PRODUCTS OF THE SUGAR CANE INDUSTRY Acetoaldehyde Esters Bagasse Power generation Ether Top and Fuel Charcoal Yeast Ethanol Acetic acid leaves Producer gas Fertilizer (vinasse) Fibrous Pulp and paper Fusel oil products Filter Fiber and particle Fertilizer board Compost cake Animal feed Boiler Sugar Furfural Wax Alpha cellulose ash Cane Miscellaneous Xylitol Glucose, fructose Animal feed Sucrose esters Sugar Dextran Activated carbon Xanthan Gum FOS Molasses Bioplastics Organics acids (citric, lactic, oxalic) Biosolvents (1-3 propanediol) MSG L-lysine Source: Adapted from Paturau Manitol and sorbitol MILL AS OTHER PRODUCTS PRODUCER ¾ RAW MATERIALS: sugar, syrup, molasses, ethanol, bagasse/trash, yeast, CO2, fusel oil, filter cake. ¾ AVAILABLE UTILITIES: high (20 to 80bar)and low pressure (2,5 bar) steam, electricity, cooling water, treated water, effluent disposal. ROUTES FOR CO-PRODUCTS ¾ CHEMICAL PROCESSING High productivity, fast process, easy products separation, difficult effluents, high pressure and temperature. ¾ BIOCHEMICAL PROCESSING Low productivity, energy intensive, more complex downstream processing, lower environmental impacts. ¾ MIXED PROCESSING PRODUCTS OF SUGAR, SYRUP AND MOLASSE-CHEMICAL PROCESSING ¾ Glucose, fructose ¾ Manitol, sorbitol ¾ Sucrose esters ¾ Oxalic acid PRODUCTS OF SUGAR, SYRUP AND MOLASSE-BIOCHEMICAL PROCESSING ¾ Ethanol ¾ Fructooligosaccharides (FOS) ¾ Polyhydroxybutirate (PHB) ¾ Lactic acid and polylactic polimer ¾ Organic acids: citric, gluconic, malic, other ¾ Monosodium glutamate ¾ L-lysine ¾ 1-3 propanediol, acetone, butanol ¾ Xanthan and dextran gums ¾ yeast and co-products PRODUCTS OF ETHANOL ¾ CHEMICAL PROCESSING Acetoaldehyde, acetic acid, esters, ether, ethyl cloride. ¾ BIOCHEMICAL PROCESSING Vinegar, acetic acid, esters. BAGASSE / TRASH ¾ COMPOSITION: cellulose, hemicellulose, lignin. ¾ HYDROLYSIS: acid, enzymatic, organosolv. ¾ HYDROLYSIS PRODUCTS: pentoses, hexoses, lignin. PRODUCTS OF BAGASSE / TRASH ¾ PENTOSE PRODUCTS - Xylose, xylitol - Furfural, furfurilic acid, resins ¾ HEXOSE PRODUCTS - Same as sugar ¾ LIGNIN PRODUCTS - Glues, polymers ¾ ANIMAL FEED ¾ PULP AND PAPER ¾ BOARDS ¾ FUEL FILTER CAKE ¾ WAX - 2 to 3% of filter cake; - Industrial waxes (household and food industry); - Sterois for drug industry. ¾ FERTILIZER - In natura; - Composting. BARRIERS FOR THE PRODUCTION OF CO- PRODUCTS IN MILLS ¾ High investment costs ¾ Necessity to operate plant year round ¾ High complexity of process ¾ Effluents difficult to treat and dispose of ¾ Lack of good downstream processing technologies ¾ Scale up problems ¾ Competition from petroleum derived products FUTURE CHANGES ¾ Market saturation and vegetative growth; ¾ Highly conservative sector: evolution is slow and technology spreads faster than changes; ¾ Probable evolution: sugar industry to sugar + energy industry; ¾ Energy: electricity and ethanol. SUGAR CANE PRIMARY ENERGY 1 TONNE OF CANE STALKS Energy (MJ) •150kg of sugars 2.300 •140kg of fiber 2.500 •140kg of fiber in leaves 2.500 TOTAL 7.300 (0.16 TOE) COUNTRIES TURNING TO CANE ENERGY ¾ Electricty generation: Mauritius, Reunion, Guadeloupe, Hawaii (USA), Brazil, India, Guatemala, Colombia, Australia. ¾ Ethanol: Brazil, India, Colombia, Guatemala, Thailand, Australia, Venezuela, Peru, Equador.
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