Gas-water mixed membrane ultrafiltration device

Abstract

The invention relates to a gas-water mixed membrane ultrafiltration device, which is innovated in that a housing is formed by connecting the upper and lower ends of a cylinder to upper and lower end sockets, respectively, the upper end socket is provided with a filtered water outlet and a gas-water mixed outlet, the lower end socket is provided with a sewage inlet and an aeration opening, an adhesive layer is located between the filtered water outlet and the gas-water mixed outlet of the upper end socket, an ultrafiltration membrane bundle is composed of a plurality of tubular ultrafiltration membranes which are distributed evenly, the upper ends of the tubular ultrafiltration membranes are fixed in the housing by the adhesive layer, the upper-end tubular mouths of the ultrafiltration membranes are communicated with an upper chamber, and the lower-end tubular mouths of the ultrafiltration membranes are plugged. The gas-water mixed membrane ultrafiltration device has the advantages that during working, filtering is carried out by using external pressure, and simultaneously, aeration is realized through the aeration opening, so that gas and sewage are in a high-frequency and sufficient contact oxidization state, as a result, COD (Chemical Oxygen Demand) in the sewage can be reduced, and in the meantime, the ultrafiltration membranes swing under double action of the water flow and the gas flow, and high cross flow operation causes the probability of polluting substances being attached on membrane filaments to block holes to be greatly reduced, and moreover, the attachment action of the pollutants on the membrane filaments is reduced.

Description

technical field [0001] The invention relates to a water filtering device, in particular to an air-water mixed membrane ultrafiltration device. Background technique [0002] The ultrafiltration (UF) device is an advanced membrane separation technology. The solvent and various small solutes contained in the feed liquid pass through the filter membrane from the high-pressure feed liquid side to the low-pressure side, thereby obtaining the permeate or ultrafiltrate. The micropores of the ultrafiltration membrane can reach less than 0.01 micron (one hundred thousandth of a millimeter), which can effectively remove particles, colloids, bacteria, heat sources and organic matter in the water, and the solute molecular film whose size is larger than the membrane pore size Retained as a concentrate. [0003] With the introduction of strict environmental protection standards by the country, more ultrafiltration membrane separation technology is applied to the advanced treatment of sewa...

AI Technical Summary

Problems solved by technology

However, conventional ultrafiltration membranes also have prominent problems in the application process of sewage and wastewater treatment. Membrane fouling is inevitable, and cleaning is usually used to restore flux. This kind of filtration belongs to the mode of pollution first and then treatment

The disadvantages are: 1. The membrane is fixed, which is easy to be polluted and blocked, and requires frequent backwashing, resulting in high frequency of membrane cleaning, short service life, and high equipment maintenance costs

2. Under normal circumstances, the removal efficiency of ultrafiltration membranes for COD and BOD is low, and the water quality indicators after treatment are likely to fail to meet the requirements. It is necessary to add other corresponding treatment equipment, which increases the cost

In addition, the conventional ultrafiltration membrane adopts a submerged built-in structure, which has the problem of troublesome cleaning of the hollow fiber MBR

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