Przemysl Chemiczny, Vol.87, No.5, 432-434, 2008
Effect of grain-size distribution of sand on the filtrate quality in vertical-flow filters
Sewage from a domestic sewage treatment plant was addnl.. purified by filtration through sand bed columns (vertical flow) under lab. conditions. The av. diam. of the sand varied from 0.28 mm to 4.28 mm. The BOD, COD and content of solid suspensions were detd. for about 360 days in 2005-2006. The purifn. efficiency substantially decreased with increasing diam. of the sand.