Filtration is an important link in the water treatment process. When the filter is running, as the interception of the filter layer increases, the sludge permeability deepens, resulting in a decrease in the filtration rate and a gradual increase in the water level of the filter. Water turbidity rises. In order to restore the normal operation of the filter and ensure the quality and quantity of the effluent, the process of backwashing at this time is to feed water from the bottom of the filter plate and impact the filter material layer on the filter plate. Due to the obsolete traditional filter technology, high energy consumption water consumption, high backwashing cost, and poor effect, the current filter design has generally adopted the filter head and filter plate air-water backwashing process of the small resistance water distribution system. The filter head and filter plate water distribution system has a series of advantages such as simple structure, reliable process technology, small head loss, low energy consumption, no dead water area, not easy to block mud, and convenient construction management.

The BAF long handle filter is an important part of the water distribution and backwashing of the biological aerated filter (BAF). The filter head material is made of imported ABS engineering plastics, composed of filter rods, filter caps, pre-embedded sleeves, etc., with high pressure-bearing strength and will not break when stepped on. The thread is strengthened in the filter head structure, and rubber washers are added to make the connection firm and permanent. Does not fall off. The filter head cap base is designed to enhance the bottom seam, so that there is no dead water zone and no mud accumulation between it and the filter plate.

>>Technical Index

◆The gap of the filter head has no defects such as incompleteness, bubbles, flashing and burrs;

◆Smooth surface of the filter head, no obvious impurities, no cracks, consistent color;

◆When only air is used for backflushing, the head loss of the filter head and the head loss of the filter head flushed by air and water at the same time should meet the design requirements

◆Filter head slot width: 2.2 soil 0.3mm,

◆Total slot area: 550mm2;

◆Installation density: 36-49pcs/m';

◆Air impact strength: 10- -20L/m*.S;

◆Water wash strength: 5-6L/m*.S;.

>>Technical parameters

>>The head loss of the flushed filter head should meet the design requirements

◆Filter head slot width: 2.2±0.3mm,

◆Total slot area: 550mm";

◆Installation density: 36- -49pcs/m';

◆Air impact strength: 10- -20L/m2.S;

◆Water wash strength: 5- 6L/m*.S;

The head loss of the filter head when only backwashing with water is not greater than the value in the table below.