How to properly anti-clean the sand filtration in the purification water equipment of the pharmaceutical?

The anti-cleaning anti-washing process of sand filtration in pharmaceutical purification water equipment is to introduce the anti-wash runoff from the lower end of the filter layer, so that the compacted filter layer is loosened and expanded to achieve a fluidity degreeUnder the dual action of collision friction between the water shear force and the filter particles, the suspended matter and colloid attached to the surface of the filter material gradually fall off, and with the back wash runoff, discharge from the upper end of the filter layer, in order to achieve the purpose of siltingThe effect of the anti-wash process of sand filtration in pharmaceutical purification water equipment is related to the reverse wash flow rate, re-washing time, rewashing water source and flushing modeThe reverse wash flow rate of sand filtration in pharmaceutical purified water equipment is generally greater than the filter flow rate, and the anti-wash pressure is greater than the filter pressureThe reverse wash flow rate of single, double and three-layer filters should be controlled in the range of 43 to 54m/h46 to 58m/h 58 to 62m/h, and the rewash time should be controlled in the range of 5 to 7min, 6 to 8min and 5 to 7min respectivelyDue to the adsorption of the filter material, the surface of the filter material often has a viscous attachment colloid, possibly under the conditions of the reverse wash runoff should be 10 to 9oL / (s?m2) air flow, to achieve the filter material gas and water scrubtors to improve the efficiency of backflushingAnti-wash water using normal operation of the sand filtration process to produce water as a good, the use of system raw water should be avoided containing coagulantsPharmaceutical purification water equipment in the anti-wash process of sand filtration discharged with a large number of flowers and pollutants, generally should be directly discharged and not suitable for reuseThe anti-wash effect of sand filtration in pharmaceutical purified water equipment is closely related to the rate of rewashing flowWhen the flow rate is too low, the filter layer is insufficiently expanded, the water shear force and the collision friction force is small, and the cleaning effect is poorWhen the flow rate is too high, the filter layer is over-expanded, and the water shear and collision friction will decrease, and the cleaning effect is still poor.