Removal of Suspended Solids from Water.
U S Patent 1983 May; (4):
Nonfibrous suspended solids, such as kaolin, quartz, clays, and phosphate slime solids, are removed from water by filtration through a bed of mgo. Thus, water containing a suspension of 20 mg sand/l (pulverized and prescreened to -400 mesh before dispersion) and with a turbidity of 3.6 Nephelometric turbidity units (ntu) was filtered through a filter with a 6-in-deep layer of -20+30 mesh mgo and a 12- in-deep layer of -30+50 mesh mgo, at a flow rate of approximately 8 gal/min-ft2 filter area. After 1.5 and 2 h, the turbidity of the water was 0.4 and 0.57 Ntu, respectively.
U.S. Patent No. 4,385,998, May 31, 1983; Chem. Abstr. 98:185,361H