| 摘要 |
PCT No. PCT/SE88/00514 Sec. 371 Date Jun. 4, 1990 Sec. 102(e) Date Jun. 4, 1990 PCT Filed Oct. 6, 1988 PCT Pub. No. WO89/03239 PCT Pub. Date Apr. 20, 1989.The invention concerns a method of and a plant for purifying water in an open, solid filter bed (17) in which, after the addition of chemicals, the water to be purified is passed through a filter bed, said filter bed being regenerated by counter-flow flushing, wherein the water to be purified in the filter bed is caused by force to flow through the bed at a constant rate by means of a partial vacuum created by a pump means (20) arranged downstream the bed (17), the flow being kept constant with the aid of a control valve (23) arranged on the pressure side of the pump (20). |
