METHOD AND DEVICE FOR DETERMINING THE CONCENTRATION OF SMALL AMOUNTS OF OIL IN WATER

摘要

1402825 Determining concentration of oil in water SALEN & WICANDER AB 27 Feb 1973 [27 March 1972] 9550/73 Headings G1A and G1N The oil concentration of an oil-water mixture is determined by concentrating the oil-water mixture by making a predetermined amount of oily-water per unit of time pass a predetermined area of a filter material which absorbs oil, and determining the oil content of the filter material. As shown in Fig. 1, the mixture is passed through a moving filter band 7 which absorbs all the oil but is highly permeable to water, e.g. a band made of polypropylene wool, the band then passing through a detector which includes a light source 11 and a photo-electric cell 15 to detect colour change of the filter band. The band may alternatively be passed through a capacitor. The band may be impregnated with an oil-soluble colour substance so that refined oils may be detected. As shown, the mixture is made to pass through the band both ways, by means of a drive 8, so that unwanted particles are removed from the band when the mixture flows down through it. A second photo-electric cell 36 is provided to detect the absence of the filter band.