FILTER I AVLOPPSRENINGSVERK / Filtration in Sewage Treatment Plants
In sewage treatment plants several types of filters are used, most of which are originally constructed for water treatment. As a matter of fact, all filter constructions are equally suitable, when the water has been prepared in a correct way for a particular filter or, reversed, the right filter is chosen for a particular water. Examples of total failure can be found in every construction. Even filterworks operating fairly well but contributing to the total effect of the work with 0-2 % only ought to be regarded as failed, that is, economically.