DECLINING AND CONSTANT RATE COUNTERCURRENT OPERATED HORIZONTAL FILTERS

A laboratory study on horizontal counter-current operated filters unde r constant and declining filtration rate conditions has been conducted . This study reveals that such filters can successfully (without signi ficant deterioration in the effluent quality) take up higher turbidity inputs, increased filtration rates and provide longer filter run time s due to nearly uniform deposition of impurities along the entire filt er depth. An empirical relation involving the several operative variab les in respect of the counter-current operated filters has also been p roposed. The proposed empirical relation is of ample use in the design of the filter operative variables and to the field engineers.