13 research outputs found
Study of different membrane spargers used in waste water treatment : characterisation and performance
In urban waste water treatment, a novel gas sparger based on flexible rubber membrane has
been used for the last ten years. The objective of this present work is to compare two flexible
membranes (the new membrane and the old membrane provided by ONDEO-DEGREMONT
group) used in waste water treatment. For this purpose, the different membrane properties
(hole diameter, pressure drop, critical pressure, deflection at the centerline and elasticity) have
been characterized. The bubble generation at the membranes with a single orifice and with
four orifices have been studied and their performances have been compared in terms of
interfacial area and power consumption. From the experimental and theoretical approach, the
new membrane is less elastic (or more rigid) than the old membrane. The bubble diameters
generated from the new membrane remain constant with the gas velocity through the orifice,
whereas they increase logarithmically for the old membrane. The inverse behaviours are
observed in terms of the bubble formation frequency. Moreover, the bubbles generated from
the new membrane have significantly larger sizes and lower formation frequencies than those
obtained with the old one. From these results, it can be noted that the new membrane has a
behaviour comparable to a rigid orifice. No coalescence phenomenon at the bubble formation
is observed from the new and the old membranes with four orifices. The interfacial area and the power consumption are evaluated and show slight differences between the interfacial area
provided by the old and the new membranes for one value of power consumption
Performance of a monofiber optical probe in determining the droplet size and velocity in spray systems comparing with a high-speed camera
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