External loop air lift type membrane bioreactor

A membrane bioreactor, air stripping technology, applied in biochemical instruments, chemical methods for reacting liquids and gaseous media, biochemical equipment and methods, etc., can solve problems such as contamination, cell loss, etc. Improve, improve filtering performance, make full use of resources

Active Publication Date: 2009-09-23
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this process, there are still some disadvantages: for example, in the process of fermenting ethanol, in addition to generating ethanol and CO 2 In addition, by-products such as succinic acid, acetaldehyde, formic acid, acetic acid, lactic acid, glycerin, fusel oil, etc.
Among these by-products, except for acetaldehyde and formic acid which have good volatility, acetic acid, lactic acid, glycerin, fusel oil, etc. are not volatile and are difficult to remove by air stripping; ethanol, CO 2 , formic acid, acetaldehyde, etc. may accumulate due to insufficient air stripping effect, which will also inhibit the progress of fermentation; in addition, in order to maintain the liquid level balance in the tank, a part of the feed liquid needs to be continuously drained, which causes a large amount of cell loss, and Some static layering methods reported in the literature to recycle cells are prone to bacterial contamination in the fermentation process
[0005] It can be seen from the above that both air stripping and membrane separation have unique advantages in biochemical reactions, and both have great application prospects, but they also have shortcomings that can make up for each other. Therefore, it is necessary to develop a method that can fully utilize various energy sources. , a new type of reactor that organically combines membrane separation and air stripping has very important practical significance

Method used

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  • External loop air lift type membrane bioreactor
  • External loop air lift type membrane bioreactor

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Embodiment approach

[0025] The outer circulation air-lift membrane bioreactor provided by the present invention is mainly composed of a reactor main body 10, a circulation pipeline 15, an air-lift tube 2, an aeration head 1, and an inorganic membrane element 3 encapsulated in the gas-lift tube. Air-lift return tube 8 , gas distributor 9 components, such as figure 1shown. The main body 10 of the reactor includes two parts, the shrinking section and the enlarged section. The inner diameter ratio of the two sections is determined by the ratio required for gas-liquid separation, which is about 1.5 to 8; the top of the main body 10 of the reactor is provided with a feed port 14 and an exhaust port 12 , A valve 13 is installed at the exhaust port to adjust the exhaust volume to adjust the pressure in the reactor. A pressure gauge is also installed on the top of the reactor to observe the pressure change of the reactor; there is a window on the reactor body for observing the reactor. The reaction pheno...

Embodiment 2

[0028] The system technology of the outer loop airlift type membrane bioreactor provided by the present invention is as follows figure 2 As shown, the details are as follows: feed liquid into the reactor through pipeline A, and blow compressed gas into it through pipeline B. The compressed gas is compressed air B-1 or cylinder-filled gas B-2, and the compressed gas passes through the flow meter B- 3 and valve B-4 control the measurement and enter the air lift pipe 2 through the aeration head 1. Driven by the compressed gas with initial velocity and the density difference, the liquid reaches the inorganic ceramic membrane separation unit 3 for microfiltration, and the valve 7 Controls whether to perform membrane separation. When the membrane separation is carried out under the pressure in the reactor or driven by the vacuum pump D-2, the valve 7 is opened, and the obtained filtrate is collected in the storage tank D-1. The concentrated solution continues to circulate through ...

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Abstract

The invention relates to a novel air lift type membrane bioreactor, in particular to an external loop air lift type membrane bioreactor which comprises a reaction kettle body 10, a circulating pipe 15and air lifting pipe 2. The external loop air lift type membrane bioreactor is characterized in that a return nozzle of the air lifting pipe is positioned under the liquid level and is connected with a return pipe 8 extending into the reaction kettle body 10; an air distributor 9 replaces the air lifting return pipe 8 to be used for distributing confluent gas, and an inorganic membrane module 10 is packaged in the air lifting pipe 2 to be used as a liquid/solid separator. The invention has simple structure, flexible operation and lower energy consumption, is easy to realize the industrial expansion, and has huge prospect especially in the biochemical reaction.

Description

technical field [0001] The invention relates to an outer circulation air lift type membrane bioreactor, which is developed according to the idea of ​​unit coupling and process strengthening. The outer circulation air-lift membrane bioreactor integrating gas-lift cycle reaction, air lift, and gas-liquid two-phase flow membrane separation is used for gas / liquid, gas / liquid / solid, etc. Reactions, especially biological fermentation processes. technical background [0002] During biochemical reactions, product inhibition often exists. The production of ethanol and butanol by fermentation is a typical example. In order to improve raw material utilization and reaction efficiency, it is necessary to continuously remove reaction products. [0003] Membrane separation technology, as a new and recognized high-efficiency separation technology, has achieved rapid development in recent years and is widely used in chemical, food, biological, pharmaceutical and other industries. Membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/12C12M1/09B01J10/00B01D61/14
CPCC12M29/18C12M29/08C12M33/14
Inventor 邢卫红景文珩李国玲张峰申屠佩兰徐南平
Owner NANJING UNIV OF TECH
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