Membrane filtration method for carrying out suspending clarification by using gravity difference

Abstract

The invention provides a membrane filtration method for carrying out suspending clarification by using gravity difference. According to the membrane filtration method, an external pressure type hollowfiber microfiltration membrane assembly is arranged in a suspending clarification tank; a water distribution pipe is arranged on the bottom portion of the suspending clarification tank and at a waterinlet position, and is provided with a plurality of holes; the pressure of influent can form upward buoyancy for the suspended particles in a liquid to be filtered in the suspending clarification tank, such that the suspended mud-residue layer can be formed inside the suspending clarification tank; the filtration part of the external pressure type hollow fiber microfiltration membrane assembly isarranged in the mud-residue layer; and the external pressure type hollow fiber microfiltration membrane assembly uses an intermittent operation mode during filtration. According to the present invention, the equipment control mode is controlled by arranging the filtration membrane in the suspended mud-residue layer, such that the quality of the produced water is increased.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a membrane filtration method for suspending clarification by using gravity difference. Background technique [0002] At present, in the field of water treatment, microfiltration technology is widely used because of its low operating pressure and low cost. However, due to the single shape of the existing membrane pool, it is difficult to improve the quality of produced water with a single membrane technology. The existing technology combines the suspension clarifier with the ultrafiltration membrane technology. The results show that compared with the traditional filtered water, the water quality of this combined process is significantly improved. However, due to the existing technology, the membrane filtration device is placed in the upper part of the tank body, and the influent is the supernatant liquid that filters the upper layer of the suspended sludge laye...

AI Technical Summary

Problems solved by technology

However, due to the existing technology, the membrane filtration device is placed in the upper part of the tank body, and the influent is the supernatant liquid on the upper layer of the suspended sludge layer, in which the pollutant particles are small, and the membrane is easily blocked during long-term continuous operation. pores, causing membrane fouling, reducing membrane flux, and affecting the operating cycle

And the conventional idea is that when the membrane is in the suspended sludge layer, the surface of the membrane will be covered by sludge, which will easily lead to a significant drop in water flux and shorten the service life.

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