Abstract
Optimized flow and economic feasibility of effluent recovery were estimated with steady state simulation model. Model system consists of brownstock washer and three bleaching stages and contains only material balance calculations. Optimization of recovery flow was evaluated with comparison of chemical consumption in bleach plant and evaporation load in chemical recovery process. Total costs were changed by how to reuse bleachery effluents and how to use fresh water in the process. Simulation results showed that favorable flow of bleachery effluent recovery was the flow that doesn't increase evaporation load, in other words, filtrates should be reused as much as possible in other parts of chemical recovery process. This is because energy cost exceeds chemical cost at present. Increase of washing stages also improved the washing efficiency and resulted in saving of recovery cost.
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