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Process for recycling organics acids from sludge anaerobic acidification mixed liquor

An anaerobic acidification and organic acid technology, applied in chemical instruments and methods, separation methods, biological sludge treatment, etc., can solve the problem of unpredictable composition of fermentation acid-producing mixed liquor, inability to transform and utilize microorganisms, and complex composition of municipal sludge, etc. problems, to achieve the effect of low cost, easy operation and emission reduction

Inactive Publication Date: 2008-12-17
JIANGNAN UNIV
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AI Technical Summary

Problems solved by technology

[0003] The composition of municipal sludge is extremely complex, which contains organic nutrients that can be used and transformed by microorganisms, as well as organic or inorganic substances that cannot be transformed and utilized or are even toxic to microorganisms, resulting in unpredictable composition of the fermentation acid mixture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A supported liquid membrane system composed of polypropylene microfiltration membrane module, trialkylphosphine oxide extractant, sulfonated kerosene organic solvent and sodium bicarbonate stripping agent was used to extract the organic acids in the sludge anaerobic acidification mixture. The concentration of organic acid in the liquid phase is 20g / L, the volume concentration of the extractant is 5%, the extraction temperature is 25°C (room temperature), the aspect ratio of the membrane module is 20:1, the pH value of the back extraction phase is 12, and the concentration of the back extraction agent is 20g / L condition, after extraction for 360 minutes, the extraction rate of organic acid was 80.2%.

Embodiment 2

[0011] A supported liquid membrane system composed of polypropylene microfiltration membrane module, trialkylphosphine oxide extractant, sulfonated kerosene organic solvent and sodium bicarbonate stripping agent was used to extract the organic acids in the sludge anaerobic acidification mixture. The concentration of organic acid in the liquid phase is 22.5g / L, the volume concentration of the extractant is 10%, the extraction temperature is 30°C, the aspect ratio of the membrane module is 20:1, the pH value of the back extraction phase is 9, and the concentration of the back extraction agent is 20g / L. Under the condition that the concentration factor is 2, after 360 minutes of extraction, the organic acid extraction rate is 79.6%.

Embodiment 3

[0013] A supported liquid membrane system composed of polypropylene microfiltration membrane module, trialkylphosphine oxide extractant, sulfonated kerosene organic solvent and sodium bicarbonate stripping agent was used to extract the organic acids in the sludge anaerobic acidification mixture. The concentration of organic acid in the liquid phase is 20g / L, the volume concentration of the extractant is 5%, the extraction temperature is 25°C (room temperature), the aspect ratio of the membrane module is 10:1, the pH value of the back extraction phase is 9, and the concentration of the back extraction agent is 30g / L condition, after extraction for 360 minutes, the extraction rate of organic acid was 91.5%.

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Abstract

A method for recycling organic acid from a mud anaerobic acidification mixture belongs to the technical field of chemical industry. The invention adopts a supporting liquid-membrane separating technology to prepare the supporting liquid-membrane by injecting an organic extraction phase which contains an extractant that can be combined with the organic acid into the millipore of a hollow hydrophobic fiber membrane; a liquid supply mud anaerobic acidification mixture passes through from the outer side of the hollow fiber and a reversed extraction liquid passes through from the inner side of the hollow fiber; as the organic acid combined by the specific extractant can be fast de-combined by the reversed extraction liquid; the organic concentrations at the inner side and the outer side of the millipore of the hollow hydrophobic fiber membrane always have larger grads, and the organic acid in the mixture can be recycled to the largest extent. The method has abundant theoretical basises, greatly improves the efficiency for converting wastes into the organic acid and decreases the discharge of contaminations; the extraction rate of the organic acid can reach 79.6 percent to 91.5 percent. The method is not only simple and effective to be operated, but also is low in cost, thus being expected to be applied in engineering practices.

Description

technical field [0001] A method for recovering organic acids from sludge anaerobic acidification mixed liquor, involving a method of extracting organic acids in sludge anaerobic acidification mixed liquor by separating and extracting organic acids in sludge anaerobic acidification mixed liquor through a support liquid membrane containing an extraction agent preferentially complexed with organic acids, thereby maximizing A method for recovering organic acids belongs to the technical field of chemical industry. Background technique [0002] Supported liquid membrane separation technology is a new separation and extraction process that combines conventional solvent extraction and membrane separation technology. It has the advantages of high separation efficiency, low energy consumption, and continuous and simultaneous separation and concentration of products. During the operation of urban sewage treatment plants, a large amount of excess sludge will be generated, and sludge tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/38B01D69/10B01D11/00C02F1/44C02F1/26C02F11/04
Inventor 李秀芬陶丽佳陈坚堵国成华兆哲
Owner JIANGNAN UNIV
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