NATURAL WATER PURIFICATION PROCESS Russian patent published in 2004 - IPC

FIELD: water treatment.

SUBSTANCE: process of treatment of iron-rich natural underground water comprises oxidant treatment, filtration through inert charge, washing of charge, disinfecting of water by UV emission, and transportation of treated water to consumers. Filtration is carried out in countercurrent mode through movable charge bed in filtration apparatus provided with air lift. Charge is washed in the top part of the apparatus simultaneously with filtration, ratio of apparatus operation time in filtration mode to that in simultaneous filtration/washing mode equals (5-1):1. Wash water containing suspended particles is sent to separation stage, after which liquid phase is returned into treatment stage and solid phase is removed from the process. Inert charge is represented by quartz sand fraction 0.3-2.0 mm, which moves with the bed at linear velocity 2 to 10 mm/min, ratio of wash water stream to sand stream in sand washing section being (0.6-2):1. Separation of wash water into solid and liquid phases is accomplished by filtration, simple separation, or settling. Solid phase withdrawn from the process is sent to production of pigments.

EFFECT: enabled wasteless and continuous water treatment process.

5 cl, 1 dwg, 2 tbl, 4 ex