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  • Two types of solid wastes are produced during the manufacture of sugar. Bagasse is produced in the mill house in a quantity of about 30% of the crushed cane. The bagasse contains 50% moisture. Press mud or filter cake is produced in vacuum filters and press filters. The mud is produced in a range of 3-8 % of the crushed cane, depending on the nature of sugar manufacturing process.

  • Press mud, which is discarded as a solid waste from sugar mills and used as a manure or as a landfill, is found to be an useful substrate for biogas production.

  • Sugar cane straw wastes can be recycled as active additions once calcined in the temperature range of 800 or 1000 C.

  • The manufacture of sugar generates large quantities of biomass waste such as rice husk, bamboo dust, bagasse, coconut coir, jute and sticks. This waste is ideal for use as fuel togenerate power.

  • Distilleries that utilize Upflow Anaerobic Sludge Blanket (UASB) for wastewater treatment include the large scale sugar cane fermentation industry in Brazil, which makes extensive use of UASB technology for its effluent treatment needs.

  • Chromatographic methods are also used in sugar production processes (e.g.: green syrup and molasses) to reduce the nonsugars and to increase the quantity of crystallisable sugar. The waste water from sugar treatment plants is normally subjected to extended aeration in ponds and is ultimately made to undergo intensive biological oxidation.

  • As the world’s largest sugar producer, Brazil has the potential to be a market for bagasse-based power generation worth $24B, yet less than10% of this opportunity is currently being fulfilled.

  • Brazil is the world’s leading producer of sugar cane, sugar and ethanol, growing sugar cane crops on five million hectares, a tenth of its cultivated land. There are around 60,000 crop suppliers, and 320 industrial units producing ethanol and sugar: driven by market demand, producers are themselves now building another 50 facilities.

  • Sugar cane now provides 13 per cent of Brazil’s energy, replacing fossil fuels with ethanol for transport and bagasse (waste pulp) for heat and power. It supplies: 180,000 barrels a day of ethanol, 400 per cent of all the gasoline used in the country.

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