13、FILTER.pdf

13 FILTERS The enormous variety of ways in which - (open) gravity filters, made of concrete or granular or precoat filtering media can be metal, used, means that a large number of filters - special filters. have been designed accordingly. The major groups are as follows: for precoat filters, depending on the for granular media, depending on support: hydraulic conditions during use: - candle filters, - pressure filters, - frame filters. Chap. 13: Filters 1. FILTERS USING GRANULAR MEDIA The technical considerations common to - operating conditions; and the various types of filters which use - internal arrangements for backwashing. granular media are summarised below;these relate to: 1.1. - maintaining the quality of the filtered OPERATING water over the entire cycle, with varying levels of suspended solids depending on the CONDITIONS intended use of the water. This is essential for make-up water or drinking water. For Cycles certain grades of industrial water, this