41results about How to "Backwash thoroughly" patented technology

The invention relates to the technical field of filtration equipment and relates to a hydroturbine propelled microfilter. The hydroturbine propelled microfilter comprises a holder, a filter screen component, a cleaning pipe and a hydroturbine, wherein the hydroturbine is fixedly mounted on the holder; the filter screen component which is cylindrical and can be driven by the hydroturbine to rotate around own axis is mounted on the holder; a filtered water outlet is formed in the filter screen component; the cleaning pipe located above the axis of the filter screen component is arranged in the filter screen component; water outlets all capable of jetting water in the pipe to the inner wall of the filter screen component are transversely formed in the cleaning pipe at intervals. The hydroturbine propelled microfilter is reasonable and compact in structure; the hydroturbine is capable of pushing the filter screen component to rotate around the own axis, and meanwhile, a high-pressure fluid can be input into the cleaning pipe; as a result, water returned by the hydroturbine can be effectively utilized and the utilization rate of the high-pressure water source for driving the hydroturbine is improved; besides, back washing can be completed at the same time of filtering; the filtering efficiency is high, the back washing is thorough and blockage can be avoided.

The invention relates to a backwash spray nozzle for a granular filter material filter device. The backwash spray nozzle comprises a connecting head, a cylinder body, nozzles and a base plate, wherein an upper ring connected with the connecting head is arranged at one end of the cylinder body, the base plate is arranged at the other end of the cylinder body, a cone head is arranged in the base plate, and 1-3 rows of nozzles are arranged on the cylinder body; 6-18 nozzles are arranged in one row, central angles alpha between every two adjacent nozzles in each row are equal, the nozzles in different rows are arrayed in a staggered manner, and staggering angles are equal to (1 / 2)alpha. In a use process, the spray nozzle is mounted at the bottom of a filter layer, a high-speed water inlet pipe and a high-speed air inlet pipe are communicated with each other, gas-water mixed liquid is ejected at high speed in a radial manner to drive peripheral filter materials to be diffused outwards at high speed to form three-phase flow of the gas, the water and the filter materials, the gas with the least specific gravity rapidly floats to penetrate through the whole filter layer due to a buoyancy effect, the three-phase flow is transversely and longitudinally covered, the filter materials are locally collided, rubbed and stirred with one another, and the three-phase flow transmits the energy to the periphery, so as to realize the effective backwash and regeneration of the whole filter layer. The backwash spray nozzle is simple in structure and good in backwash effect and is convenient to use.

A bioreactor with internal with internal circulation and dual filters for treating sewage is composed of water distributing chamber with water distributor, bearing plate, bearing layer, fitlering layer and cyclic aerating cylinder with filter-water outlet unit. The sewage is circulating through said water distributor, cycle aerating cylinder and filter layer, and is filtered by filter layer and the filter-water outlet unit.

The invention discloses a backwashing method of a filter, which solves a problem of low backwashing efficiency of traditional filters, a specific method is that a whirl cavity, a water collection cavity, a filtering medium collection and transfer cavity and a discharge cavity are all installed in the filter, so that a mixed liquor generates a strong centrifugal separation acting force after passing through the whirl cavity, the acting force results in not only applying a rubbing force on the filtering medium, but also effectively separating the filtering medium from oil and suspending impurities through their channels, namely, the oil and the suspending impurities are discharged from a tank via the water collection cavity, the washed filtering medium is sequentially returned back to the tank via the collection and transfer cavity and the discharge cavity, repeating in this cycle, the filtering medium can be completely washed; the invention also provides a device capable of implementing the method.