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Membrane cleaning using an airlift pump

An air lift pump, gas technology, applied in membrane, membrane technology, semi-permeable membrane separation, etc., can solve problems such as the need for ejectors

Active Publication Date: 2010-03-24
EVOQUA WATER TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This system has the disadvantage that each component requires an injector and an energy consuming pumping system to force the liquid through the injector

Method used

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  • Membrane cleaning using an airlift pump
  • Membrane cleaning using an airlift pump
  • Membrane cleaning using an airlift pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] with reference to the attached figure 1, this embodiment includes a membrane module 5 having a plurality of permeable hollow fiber membrane bundles 6 installed in and protruding from a lower end sleeve 7 . In this embodiment, the bundles are spaced so as to form gaps 8 between the bundles 6 . It should be appreciated that any desired arrangement of membranes within module 5 may be used. A plurality of openings 9 are provided in the lower end sleeve 7 allowing fluid to flow through said openings from a dispensing chamber 10 disposed below the lower end sleeve 7 .

[0028] An air lift pump device 11 is provided below the dispensing chamber 10 and is in fluid communication therewith. The airlift pump unit 11 comprises a pump chamber 12, typically a tube or conduit, open at its lower end 13 and having a gas inlet 14 midway along its length.

[0029] In use, the assembly 5 is immersed in a liquid feed 15 and a source of pressurized gas is applied to the gas inlet 14 at a ...

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Abstract

A membrane module (5) comprising a plurality of porous membranes (6), a gas-lift pump apparatus (11) in fluid communication with the module (5) for providing a two- phase gas / liquid flow such that, inuse, the two-phase gas / liquid flow moves past the surfaces of the membranes (6) to dislodge fouling materials therefrom. The gas-lift pump device (11) includes: a vertically disposed chamber (12) ofpredetermined dimensions submersed to a predetermined depth in a liquid medium (15), wherein the chamber (12) has an upper portion (10) in fluid communication with the membrane module (5) and a lowerportion (13) in fluid communication with the liquid medium (15); a source of gas (14) in fluid communication with the chamber (12) at a predetermined location therein for flowing gas at a predetermined rate into the chamber (12) to produce the two-phase gas / liquid mixture and to produce a flow of the mixture into the membrane module (5). The dimensions of the chamber (12), the submersion depth ofthe chamber (12), the rate of flow of gas and the location of gas flow into the chamber (12) are selected to optimize a flow rate of the two phase gas / liquid mixture into the module (5).

Description

technical field [0001] This invention relates to membrane filtration systems, and more particularly to apparatus and related methods for effectively cleaning membranes used in these systems by a mixture of gas and liquid. Background technique [0002] The importance of membranes for wastewater treatment is rapidly increasing. It is now well known that membrane treatment can be used as an efficient tertiary treatment of sewage and provides a good quality effluent. However, capital and operating costs are prohibitive. With the advent of submerged membrane processing, in which the membrane modules are submerged in a large feed tank and the filtrate is collected either by suction acting on the filtrate side of the membrane or by gravity, the biological and physical processes are combined in one stage. Membrane bioreactors are bound to be more compact, efficient and economical. Because of their versatility, membrane bioreactors range in size from domestic (such as septic syste...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D65/06C02F3/06B01D65/04B01D65/08
CPCB01D2313/26B01D63/043B01D2315/06B01D2321/18B01D65/02B01D65/08B01D2313/21C02F3/1273B01D63/02Y02W10/10B01D63/034B01D65/04B01D65/06
Inventor 查富芳刘文军
Owner EVOQUA WATER TECH LLC
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