Lvyuan Industrial Filtration Solution

Sintered filter backwashing reverse flushing pressure design parameters and quantity of the air

by:Lvyuan      2021-01-21
Sintered filter, activated carbon filter, mechanical filter such as quartz sand filter is a common water treatment filtration equipment, after the equipment to intercept impurities, in and out of the nozzle pressure difference, then to carry on the back flush, there are two way, these mechanical filter backwash water recoil and recoil respectively. The next filter source water treatment technology co. , LTD. Relevant technical personnel to introduce gas water recoil knowledge for the user.


mechanical filter expansion height: reverse wash, to ensure that the 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%.


backwashing water amount and pressure: general design requirements, the strength of the backwashing water for 18 15m3/( m2·h) , backwashing water pressure: 0. 15 - 0. 3MPa。


backwashing air quantity and pressure: backwashing intensity of 15 m3 / air ( m2 ·h) 0 or less, backwashing air pressure. 15 MPa。


note: in the process of backwashing, bubbled into the backwashing air converge in the top of the filter, most should through the double orifice discharge valve discharge. In daily production. Need to check the flowing of the exhaust valve, the main representation on the valve ball lift degrees of freedom.


note: in production, filling height, height of expansion of filter material such as random inspection, 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: ensure the stability of filtered water quality, to ensure that the backwash effect.


1, the principle of sintering filter backwash:


reverse flow through the filter material layer, the filter layer, suspension, with the help of the flow of the shear force and particle collision friction cleaning filter material layer make the dirt from the inside the filter layer and the backwashing water.


2, dual media filter backwash process:


filter backwashing, is mainly refers to filter in use after a certain period, the filter material layer entrapment and adsorption amount of debris and stains, and this makes the effluent water quality of filters, filter water quality variation after the normal filter, increase the pressure difference between the inlet and outlet pipe, at the same time, the flow of a single filter is reduced.


3, sintering, the necessity of filter backwash:


in the process of filtering, 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.


4, quartz sand flushing process matters needing attention:


when the filter backwash filter source water treatment equipment company in order to ensure the 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, to fill the filter material of the filling height, height and 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: ensure the stability of filtered water quality, to ensure that the backwash effect. Backwashing water volume and pressure.
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