FREE-FLOW FILTERS DRAIN DISTRIBUTION SYSTEM Russian patent published in 2016 - IPC B01D24/46 B01D29/44 

FIELD: technological processes.

SUBSTANCE: invention relates to devices for water treatment and can be used for drainage systems in filtering water treatment plants and post-treatment of waste water and drinking water preparation. Drain-distribution system is composed as a filtering element faced with its convex surface upward and provided with a manifold, which serves for supply of water and air into it. Filtering element is composed of shaped elements to form working slots between them. Each shaped element is made with a vertical section in the form of a trapezoid directed downwards. Along the arch of the frame on its inner side there are rigidly fixed in series ten longitudinally oriented chambers provided with drain holes for supply of water and air. Drain holes with diameter d₁ of 6 mm made in two pairs of chambers are used for water supply. They are located along the length of the elements with increasing 1:2 pitch between them and reducing their amount of 2:1 in the degree of ranging a pair of elements from the support plate of the filtering element. Drain holes with diameter d₂ of 3 mm made in the other pairs of chambers are used for air supply. Said drain holes are also arranged along the length of the chambers, and their number and spacing between them are varied by the degree of ranging pairs of these chambers from the upper point of the filtering element in the ratios equal to: 1:3:1.5 and 3:1:2 respectively. System is equipped with a vertical tubular receiving-mixing chamber, which is made passing through the support plate of the frame. Tubular receiving-mixing chamber is equipped with vertically oriented symmetrically arranged on both sides along its diameter slots with length A and width B and with the ratio of A:B equal to 50:1. Cross-section square S₁ of the tubular receiving-mixing chamber is equal to 2/3 of section square of the filtering element S_2. Total area of the longitudinal slots and the holes makes 1/10 from the tubular receiving-mixing chamber cross-section square S₁.

EFFECT: higher efficiency of filtration.

1 cl, 2 dwg