Design Synthesis for Simultaneous Waste Source Reduction and Recycling Analysis in Batch Processes

The issues of waste generation in batch process plants differ in many aspects from those in continuous plants. Despite the smaller-scale of processing, complexities from discontinuities and run-to-run variations make waste minimization in batch plants more challenging. In this paper, we introduce an integrated qualitative-quantitative methodology and decision support system, called Batch-ENVOPExpert, for assessing waste minimization opportunities in batch processes. First, a qualitative analysis is performed to identify the sources of wastes and to derive recipe-level waste minimization solution. This is followed by detailed analysis at process variables level using mathematical simulation. The application of the methodology is illustrated using a propylene glycol case study.