Membrane blocking by barium sulphate

During the first two years of operation of an ultrafiltration system for drinking water despite regular backwashing deposites occurred on the membrane surface, which reduced the permeability of the membranes to only 25 L / m × h × bar.

Intensive investigations on the membranes have shown that the deposits essentially contain barium sulphate and also some strontium sulphate in smaller amounts.

In this case study was proved, that by cleaning with "Dr. Nähring Memobrane 35" and Activator the deposit which was blocking the membranes could be removed completely. The permeability of the membranes after the cleaning was > 500 L / m × h × bar.

 

Development of flow rates over 2 years

Source: Stadtwerke Feuchtwangen