Gas-stripping internal circulation filter and liquid membrane filter method

Abstract

The invention belongs to the technical field of environment-friendly water processing and membrane separation, in particular to a pressure type hollow fibrous membrane or capillary membrane filter that forms air-lifting liquid circulation inside the filter as well as a liquid membrane filtering method. The membrane filter is applicable to membrane bioreactors (MBR), membrane-enhanced bioreactors (MEBR) and membrane filtering. The membrane filter of the air-lifting inner circulation and the bottom of the membrane filter of the liquid membrane filtering method are provided with an aeration device and communicated liquid reflux passages are arranged between an upper liquid drawing chamber and a lower liquid drawing chamber of the membrane filter; wherein, the arrangement of the aeration device and a liquid reflux device ensures the aeration of the aeration device is not implemented in the liquid reflux passages; and through the air-lifting effect, the filtered liquid forms an upward liquid flow in an aeration space and a downward liquid reflux in a non-aeration space, thus realizing the liquid circulation inside the membrane filter with air-lifting force as the impulse force. The technique can not only ensure the inner pressure of the membrane filter, but also ensure ultra-high linear liquid flow speed on membrane surface through the air-lifting effect, and therefore realizes the external-pressure MBR with low energy consumption.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment technology and membrane separation technology, and particularly relates to a pressure-type hollow fiber membrane or capillary membrane filter and a liquid membrane filtration method which form a gas-lift liquid circulation inside the filter. This kind of membrane filter is suitable for membrane bioreactor (MBR), membrane enhanced bioreactor (MEBR) and membrane filtration. technical background [0002] Hollow fiber membranes or capillary membranes or tubular membranes in the known art generally constitute pressure or submerged membrane filters. There is no clear distinction in the industry between the hollow fiber membranes, capillary membranes and tubular membranes. For the sake of simplicity, the following are collectively referred to as capillary membranes, and the hollow fiber membranes, capillary membranes or tubular membrane filters involved are collectively referred t...

AI Technical Summary

Problems solved by technology

The Chinese patent "Air Lifting Circulation Membrane Bioreactor and Sewage Treatment Method" (application number 200710195136.2) pointed out that although the submerged membrane filter has a high anti-pollution ability, it has broken wires, high energy consumption, and surface sludge. Technical weaknesses such as difficulty in chemicalization and cleaning

In addition, these technologies can hardly provide a liquid level pressure higher than that of the liquid pool connected to it when forming the gas stripping liquid circulation flow, which affects the membrane filtration flux.

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