Industrial Biokidney

Especially for the pulp & paper sector

Paper production consumes large quantities of water. In recent years, many mills have put a great deal of effort into reducing the water consumption. However, recirculation of mill whitewater results in COD concentrations that build to levels promoting unwanted bacterial growth that cause production and product quality problems.  Thus, an in-mill biological treatment process or biokidney is used to improve the recirculated water quality to reduce water consumption without production problems.

The biokidney is integrated right into the whitewater recirculation system. This biokidney must function well under the same process conditions of pH and temperature demanded of the whitewater for paper production. Since increasing levels of mill closure result in a parallel increase in process water temperature, special demands and design considerations arise for in-mill biological treatment systems.