A self-generated membrane filtration method and filtration device for wastewater treatment

Abstract

The invention discloses a self-forming membrane filtering method and device for wastewater treatment. According to the technical scheme, a fixed membrane carrier is arranged in an airtight cylinder; solid suspensions (SS) in wastewater are coagulated into relatively large flocculent particles under the action of a flocculant; the flocculent particles are attached to the cylinder or prism membrane carrier under preset pressure and cyclone action to automatically form a membrane; the wastewater is filtered, and the filtered wastewater is discharged through the self-forming membrane layer. The self-forming membrane filtering device comprises the airtight cylinder, wherein a back-flushing device is arranged at the top of the airtight cylinder; a mud discharging channel is formed in the bottom of the airtight cylinder; a water inlet is arranged in the side near the bottom end of the airtight cylinder; a water outlet is arranged in one side near the top end of the airtight cylinder; the membrane carrier connected respectively with the back-flushing device and the water inlet is arranged in the airtight cylinder; a cyclone pipe communicated with the water inlet is arranged at the bottom end in the airtight cylinder. The method is simple in treatment technology, small in occupied area, low in cost, high in efficiency and great in energy-saving effect.

Description

technical field [0001] The invention belongs to the technical field of membrane filtration, and in particular relates to a physical filtration method which utilizes suspended solids in wastewater to build a membrane to achieve the purpose of filtration, and a matching filtration device. Background technique [0002] After more than half a century of development, my country's membrane industry has entered a period of rapid growth. Membrane technologies such as ultrafiltration, microfiltration, and reverse osmosis are widely used in energy and power, nonferrous metallurgy, seawater desalination, water supply treatment, wastewater reuse, and medicine and food. applications are expanding rapidly. Especially in recent years, with the implementation of the national energy conservation and emission reduction policy and the development of the environmental protection industry, membranes, the core component of water treatment, are being used more and more widely, and the total market ...

AI Technical Summary

Problems solved by technology

[0004] The biggest problem in membrane application is pollution during use. Membrane pores are easily blocked by impurities in water, resulting in a decrease in flux and flow rate. The conventional method is to perform backwashing to restore the original permeability of the membrane pores.

However, due to long-term use of excessive fouling, normal flushing cannot achieve or restore the original use effect, which requires timely replacement

Therefore, when membrane technology is used in sewage treatment, the loss and replacement of membrane components are the main factors that drive up the cost

Membrane technology has strict requirements on water quality conditions in use, and often requires strict pre-treatment, which also affects the application in some fields to a certain extent.

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