Washing method of filter cloth filter

The cleaning of the filter tank is mainly realized by the high-speed water flow opposite to the filtering water flow direction. This is the so-called backwashing. During the filtering process, the suspended matter in the raw water is adsorbed by the surface of the filter material and continuously accumulates in the filter layer. The pores of the layers are gradually blocked by dirt, and the filter head loss is increasing. When a certain limit is reached, the filter material needs to be cleaned, and backwashing can restore the working performance of the filter and continue working.

When the filter cloth filter is filtered, due to the increase of water head loss, the shear force of the water flow on the dirt adsorbed on the surface of the filter material becomes larger, and some of the particles move to the lower filter material under the impact of the water flow, which will eventually cause the water to suspend The content of substances is constantly rising, and the water quality is getting worse. When it reaches a certain level, the filter material needs to be cleaned. Backwashing can restore the dirt holding capacity of the filter material layer. What are the methods for backwashing the filter? Backwashing with water to flush the filter material particles After being suspended, the shear force generated by the high-speed water flow between the filter media washes down the suspended matter and takes it away with backwash water.

The filter cloth filter tank can be backwashed with water to assist the surface cleaning. The surface washing water is sprayed from the nozzle installed on the filter material layer to fully agitate the surface of the filter material layer to promote the adsorption of suspended matter from the filter material particles. At the same time, the flushing water can be saved. The surface washing cycle can be started 1min or 2min before the water backwash cycle, and the two cycles last about 2min, with water backwashing assisted by air scrubbing. Before the water backwash cycle starts, first pass in compressed air for about 3min or 4rain to agitate the filter material, and then use backwash water to wash away the suspended solids, which also saves the amount of rinse water.