Wastewater Minimization in Pulp and Paper Industries through Energy-Efficient Membrane Processes

Pulp and paper mills utilizing the Kraft pulping method demand large amount of water for the manufacturing processes. The purpose of this study is to evaluate opportunities of minimizing fresh water intake within pulp and paper processes by recycle and regeneration of wastewater streams. The compounds of concern are chlorinated salts which have a negative impact on environment and process equipments. Superstructure optimization is applied to synthesize Reverse Osmosis Network (RON) in order to regenerate wastewater streams with reduced salt concentration at minimum cost and to satisfy process water demand. A case study is presented to evaluate potential benefits of RON on minimizing wastewater consumption.

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