Evaluation of different cleaning agents used for cleaning ultra filtration membranes fouled by surface water

Salt cleaning of organic-fouled reverse osmosis membranes.

Cleaning of organic-fouled reverse osmosis membranes with concentrated salt solutions has been investigated. Polysaccharides (alginate and pectin) and Suwannee River natural organic matter were used as model organic foulants. By systematically varying the chemical and physical factors affecting salt cleaning efficiency, we were able to elucidate the processes and mechanisms involved during salt...

The optimisation of ultrasonic cleaning procedures for dairy fouled ultrafiltration membranes.

Ultrafiltration (UF) of whey is a major membrane based process in the dairy industry. However, commercialization of this application has been limited by membrane fouling, which has a detrimental influence on the permeation rate. There are a number of different chemical and physical cleaning methods currently used for cleaning a fouled membrane. It has been suggested that the cleaning frequency ...

Ultrasonic cleaning of submerged membranes for drinking water applications

SUBSTITUTING FOR CFCs USED AS CLEANING AGENTS: (1) PARTICLE REMOVAL

Freon-TF is no better a cleaning fluid than deionized water for removing either organic (polystyrene latex spheres) or inorganic (glass beads) particles from silicon wafer surfaces, as shown by comparative measurements of cleaning efficiencies in both an ultrasonic bath and a hydrodynamic cleaning apparatus. A primary reason for this lackluster performance is the higher van der Waals’ forces of...

Ultrasound irradiation combined with hydraulic cleaning on fouled polyethersulfone and polyvinylidene fluoride membranes.

In this study, an ultrasonic irradiation technique was utilized to mitigate the fouling of polyethersulfone (PES) and polyvinylidene fluoride (PVDF) membranes. The use of ultrasound at 20 kHz was applied to a dead-end microfiltration cell in order to mitigate fouling caused by the presence of colloidal bentonite particles. The effect of ultrasonic power and pulse duration on the permeate flux r...