Monitoring waste liquid to determine membrane cleansing performance

摘要

The integrity of membranes utilized on-board marine vessels to separate oil from oily waste water is monitored by conducting the cleansed waste water along a predetermined path through an enclosure within which a surface of such waste water during flow is exposed to a confined body of air so as to effect the extent of light absorbed therefrom into the waste water. Sensing the light remaining in the body of air produces signals from which membrane integrity may be determined based on the presence of an oil film on the air exposed waste water surface.