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Clarification of cane juice for fermentation

Steindl, Roderick J. (2010) Clarification of cane juice for fermentation. In Hogarth, Mac & Knight, Peter (Eds.) Proceedings of the 27th International Society of Sugar Cane Technologists Congress, Veracruz, Mexico.

Abstract

Fermentation feedstocks in the sugar industry are based on cane juice, B molasses or final molasses. Brazil has been producing ethanol by directing sugarcane juice to fermentation directly or using lower quality juice as a diluent with B molasses to prepare the fermentation broth. One issue that has received only limited interest particularly from outside Brazil is the most appropriate conditions for clarification of the juice going to fermentation. Irrespective of whether the juice supply is the total flow from the milling tandem or a diffuser station or a part of the total flow, removal of the insoluble solids is essential. However, the standard defecation process used by sugar factories around the world to clarify juice can introduce unwanted calcium ions and remove other nutrients such as phosphorus and nitrogen that are considered essential for the fermentation process. An investigation was undertaken by SRI to assess the effects on the constituents of cane juice when subjected to the typical clarification process in an Australian factory and what conditions would be needed to provide a clarified juice suitable for fermentation. Typical juices from one factory were clarified in laboratory trials under a range of pH conditions and the resulting clarified juices analysed. The results indicated that pH had a major effect on the residual concentrations of key constituents in the clarified juice and that the selected clarification conditions are determined by the nominated quality criteria of clarified juice feedstock for fermentation. Further trials were conducted in overseas factories to confirm the results obtained in Australia. It became apparent that the preferred specifications for clarified juice going to fermentation varied from country to country. Each supplier of fermentation technology had criteria applying to clarified juice feedstock that would have a major impact on the standard of clarification required to achieve compliance with the criteria.

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ID Code: 34291
Item Type: Conference Paper
Keywords: Juice, Clarification, Fermentation, Turbidity, Insoluble Solids
ISBN: 9780949678379
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CHEMICAL ENGINEERING (090400) > Process Control and Simulation (090407)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CHEMICAL ENGINEERING (090400) > Chemical Engineering not elsewhere classified (090499)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > INDUSTRIAL BIOTECHNOLOGY (100300) > Bioprocessing Bioproduction and Bioproducts (100302)
Divisions: Current > Research Centres > Centre for Tropical Crops and Biocommodities
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2010 Please consult the authors.
Deposited On: 31 Aug 2010 11:28
Last Modified: 16 Oct 2012 15:47

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