To test the efficiency of DTE back-impulse modules a 400 mg/l MEC containing aqueous solutions was used.
The used membrane had a membrane area of 0.1 m2 and 3 kD molecular weight cut-off. The aqueous mixture was conducted in the retentate cycle with a velocity of 120 l/h. After 2 hours the impulse mode was stopped.
According to the first graphic right a decrease of trans-membrane flux appeared immediately afterwards. That effect which was already observed in connection with the use of DTE flow initiators for conditioning of laundry waste waters or SiC- slurries. Thus it could be reproduced for another substance class.
The second diagram right represents the course of permeate flux for the operation modes impulse mode (back-impulse module is on) and non-impulse mode (back-impulse module is off). At impulse mode the transmembrane flux is higher than in non-impulse mode. In conformity to this result the right diagram below demonstrates that at impulse mode the concentration of methylcellulose in the retentate increases stronger. This example of application underlines that DTE RIP-modules contribute to an improvement of the trans-membrane flux.
)
)
)
)
