Quartz sand filter backwash and washing operation

Quartz sand filtration process, etc are filter material layer interception in raw water adsorption and constantly accumulated in the filter material layer, so the filter layer porosity by contamination jams, gradually form a filter cake in the surface of filter layer, filter head loss increases. When a limit is reached, need to have clean filter material, improves the performance of the filter layer recovery work, continue to work.

the suspended solids in sewage contains a large amount of organic matter, long-term retention in the filter layer can lead to bacterial microorganism enrichment of reproduction in the filter layer, and anaerobic corruption, need to regular cleaning filter material. To filter because the head loss increases, the water adsorbed on the surface of the filter material, dirt of shear force, some particles in the impact of the water flow down to lower level in the filter material, will eventually make the suspended solids in the water content increasing, the water quality variation, when impurities through filter layer, the filter filtering effect. Therefore, to a certain extent, clean the filter material, in order to restore the pollutant carrying capacity of filter material layer.

back flush, in order to ensure filter material particles have enough clearance for dirt quickly with the water filter, filter layer inflation have thrown some. But when the inflation rate is too high, less the number of particles per unit volume of filter, particle collision opportunities to reduce, so adverse to cleaning. Double filter material, inflation rate is 40% - - - 50%. Filter with air wash first, and then water backwash: first of all to filter water level dropped to 100 mm filter layer on the surface, into the air for several minutes, then back flush with water. Suitable for light pollution and the internal contamination on the surface of the filter. The corresponding valve, closing must be in place; Otherwise, when the water level has dropped below filter layer surface, the top of the filter layer without water infiltration, particle fluctuation in the process of the disturbance, dirt can not efficiently, it will move into the depths of the filter layer.

in the production run, filling height, height of expansion of filter material such as random check, because the normal backwashing process, there will be a part of the filter material run or wear, need to supplement. Filter layer is relatively stable, has the following advantages: the stability of filter water quality, to ensure that the backwash effect. Backwashing water volume and pressure.

quartz sand filter is washed and backwashing instructions

1, backwashing; Steps: open the valve, valve and exhaust valve c b f, close the other valves, open water self-priming pumps. Backwashing, when the exhaust valve f water, close the discharge valve f, backwashing time will be subject to discharge water clean.

2, is wash steps: d first open the valve, close the valve b, open the valve 'a', close the valve c ( Pay attention to close the order, because the water pump is open, must ensure that water is a pathway, otherwise, the pipe is easy to crack leakage) , are washing time will be subject to clean water.

3, operation steps: e open the valve, close the valve d, the filter is in running state.

note: filter operation after a period of time, filter intercept the impurities, if flow rate is reduced, or in and out of the water pressure difference at 0. 07 - 0. 1 mpa is needed backwashing and washing operation. Backwashing and positive wash operation as above.