Coagulation-efficient sedimentation-air flotation/gas stripping-membrane integrated device and membrane pollution alleviating method

Abstract

The invention discloses a coagulation-efficient sedimentation-air flotation / gas stripping-membrane integrated device, which includes a coagulation reactor, a shell, an external pressure type hollow fiber membrane component, an aeration component, a backwash water inlet pipe, a floc discharge pipe, a water outlet pipe, a vent pipe and an inclined plate sedimentation component. The inclined plate sedimentation component is composed of overlapped hollow circular platform or hollow regular prismoids and support rods, and is arranged along the axial direction of the shell, is sleeved outside the external pressure type hollow fiber membrane component, or the external pressure type hollow fiber membrane component is sleeved outside the inclined plate sedimentation component. The invention also discloses a membrane pollution alleviating method. According to the method, a coagulant is added to raw water, hydraulic conditions are applied to perform coagulation treatment, and then the integrated device is employed to conduct gas stripping / flotation, sedimentation and membrane filtration treatment under aeration conditions. The integrated device can effectively alleviate the adverse effects of aeration caused floc rupture on membrane properties, reduce the cleaning frequency of the membrane component, and prolong the service life of the membrane component.

Description

technical field [0001] The invention belongs to the technical field of membrane combination process method and device for water treatment, and specifically relates to a coagulation-high-efficiency sedimentation-air flotation / air lift-membrane integrated device and a method for reducing membrane pollution. Background technique [0002] In recent years, in order to meet the increasingly stringent sanitary standards for drinking water, technologies such as microfiltration, ultrafiltration, and reverse osmosis in the field of membrane treatment have been more and more researched and applied. In drinking water treatment, hollow fiber microfiltration membranes and ultrafiltration membranes are widely used. During membrane filtration, particles, colloidal particles or solute macromolecules in water come into contact with the membrane and have physical, chemical or mechanical interactions with the membrane. These particles, colloidal particles or solute macromolecules are likely to ...

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Problems solved by technology

Although the use of this process and the integrated device can reduce the degree of membrane fouling to a certain extent, when the integrated device is used for water treatment, because the flocs are in direct contact with the membrane surface, it is easy to cause membrane pore blockage, and Under the impact of the air bubbles generated by aeration, the flocs will be broken into smaller flocs, and these small flocs will seriously aggravate the shrinkage of the membrane pores and the pollution of the clogging of the membrane pores. Therefore, it is impossible to use this integrated device for water treatment Effectively avoid membrane fouling and shorten the service life of the membrane. In order to prolong the service life of the membrane and ensure the effect and efficiency of water treatment, the membrane modules need to be cleaned frequently, which will cause problems such as high operation and maintenance costs of the equipment.

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