Towards sustainable Production – closing water and solvent cycles at Millipore.

The original objective of this project was to implement membrane technology to recover solvents as well as ultra pure water, from specific process streams, for reuse in production. The projected environmental benefits were an approximate 80% reduction in COD & hydraulic load to effluent treatment plant, and consequent savings in energy and natural resources used in the treatment process. Other trials were carried out using reverse osmosis, pervaporation and vacuum distillation. These technologies were not found to be economically feasible. Therefore, the approach of the project was changed to focus on elimination of the solvent from the wastewater through process improvement. Prevention at source was implemented through the use of wiper blades to prevent solvent carry-over to the next step in the process.

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