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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3577

Title: Mathematical technique for the design of near-zero-effluent batch processess
Authors: Gouws, JF
Majozi, T
Keywords: Zero-effluent
Batch process
Wastewater minimisation
Mathematical technique
Mass balance constraints
Scheduling constraints
Water SA
Batch plants
Water reuse
Issue Date: Jul-2008
Publisher: Water Research Council
Citation: Gouws, JF and Majozi, T. 2008. Mathematical technique for the design of near-zero-effluent batch processess. Water SA, Vol. 34(3). pp 291-295
Abstract: Wastewater minimisation in chemical processes has always been the privilege of continuous rather than batch plants. However, this situation is steadily changing, since batch plants have a tendency to generate much more toxic effluent compared to their continuous counterparts which are usually encountered in bulk manufacturing. Past methodologies for wastewater minimisation in batch processes have focused on operations based on mass transfer. Consideration is not taken to the reuse of wastewater as part of product formulation. Reusing wastewater in product formulation has the major advantage of negating much of the effluent produced, thereby enabling a process to operate in an almost zero-effluent manner. Presented in this paper is a mathematical technique for the simultaneous design and scheduling of batch operations operating in a near-zero-effluent manner. The technique determines the number and size of the processing vessels, while ensuring maximum water reuse in product. The technique was applied to an illustrative example, and an 80% savings in wastewater was achieved, with a corresponding plant design that achieves the required production.
Description: Copyright: 2008 Water Research Council
URI: http://hdl.handle.net/10204/3577
ISSN: 0378-4738
Appears in Collections:Water resources and human health
Advanced mathematical modelling and simulation
General science, engineering & technology

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