UF/NF treatment of rinsing waters in a liquid detergent production plant

In this paper the results of an applied research project within the scope of the transfer centre 4031 funded by the German Research Foundation (DFG) are presented. In cooperation with the Henkel Genthin GmbH investigations have been made on the application of UF/NF membrane processes for the separation of surfactants from Cleaningin-Place (CIP) rinsing waters in a liquid detergent production plant. A membrane screening has been performed as well as pilot plant experiments. Chemical Oxygen Demand (COD) reductions in the wastewater of up to 96% have been achieved resulting in less environmental impact and lower wastewater disposal costs.

Suitable membranes for the removal of surfactants from CIP rinsing waters have been found and significant reductions of the COD loads (up to 96%) resulting in lower wastewater disposal costs have been achieved. The integration of a membrane filtration step into the water network of Henkel Genthin is technically appropriate and economically feasible.