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Process for concentrating protein in soy protein wastewater by two-stage foam separation method

A technology for concentrating soybean protein and soybean protein wastewater, applied in peptide preparation methods, chemical instruments and methods, organic chemistry, etc., can solve the problems of high investment and production costs, unrecoverable products, and complicated operating processes in membrane separation methods. Achieve convenient operation, reduce processing costs, and increase protein concentration ratio

Inactive Publication Date: 2010-10-27
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a process for concentrating protein in soybean protein wastewater by two-stage foam separation method, which uses two-stage foam separation technology to concentrate protein in soybean protein wastewater, which overcomes the equipment occupation area of ​​biochemical method Large and unable to recover products, membrane separation method and ion exchange resin method have high investment and production costs, and the defects of complex operation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The first step is the collection and detection of wastewater from the production of soybean protein

[0021] Collect the waste water of a soybean protein factory, detect with GB / T20371-2006 (the following examples are the same) the protein concentration of the waste water is 3g / L, and the pH is 4.5;

[0022] Second step, wastewater pretreatment for soybean protein production

[0023] Use sodium hydroxide aqueous solution (1mol / L) to adjust the pH value of the wastewater from the production of soybean protein described in the first step to 6.5 to 6.7, as the initial wastewater, enter the first-stage foam separation in the second-stage foam separation process as the feed ;

[0024] The third step, two-stage foam separation process

[0025] The first-stage foam separation process: the temperature of the foam separation tower is 55-58°C, the superficial gas velocity is 0.97-1.03mm / s, the height of the foam layer is 0.60-0.65m, and the foam flowing from the top of the towe...

Embodiment 2

[0031] The first step is the collection and detection of wastewater from the production of soybean protein

[0032] Collect the wastewater from a soybean protein factory, the protein concentration of the wastewater is 4g / L, and the pH is 4.5;

[0033] Second step, wastewater pretreatment for soybean protein production

[0034] Use sodium hydroxide aqueous solution (1mol / L) to adjust the pH value of the wastewater from the production of soybean protein described in the first step to 6.9 to 7.1, as the initial wastewater, enter the first stage foam separation in the secondary foam separation process as the feed ;

[0035] The third step, two-stage foam separation process

[0036] The first-stage foam separation process: the temperature of the foam separation tower is 59-61°C, the superficial gas velocity is 1.2-1.3mm / s, the height of the foam layer is 0.68-0.73m, and the foam flowing out from the top of the tower becomes the first after foam breaking For the defoaming liquid ...

Embodiment 3

[0040] The first step is the collection and detection of wastewater from the production of soybean protein

[0041] The waste water from a soybean protein factory was collected, and the protein concentration of the waste water was detected to be 5g / L, and the pH was 4.5;

[0042] Second step, wastewater pretreatment for soybean protein production

[0043] Use sodium hydroxide aqueous solution (1mol / L) to adjust the pH value of the wastewater for producing soybean protein described in the first step to 7.3 to 7.5, as the initial wastewater, enter the first-stage foam separation in the secondary foam separation process as feed ;

[0044] The third step, two-stage foam separation process

[0045] The first-stage foam separation process: the temperature is 63-65°C, the superficial gas velocity is 1.6-1.7mm / s, and the height of the foam layer is 0.75-0.80m. For the foam liquid, the foam flowing out from the top of the tower is broken by a mechanical foam breaking method, and the...

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Abstract

The technical scheme of the invention belongs to the wastewater processing field, in particular to a process for concentrating protein in soy protein wastewater by a two-stage foam separation method, comprising the following steps: 1) collecting and detecting soy protein production wastewater; 2) preheating the soy protein production wastewater; and 3) performing two-stage foam separation processby utilizing a foam separation tower. In the process, the two-stage foam separation technology is applicable to concentrating the protein in the soy protein wastewater, the concentration ratio of theprotein in primary foam separation can reach 6.0-8.0, the protein in defoaming solution is dissolved out after the concentration thereof exceeds solubility, and the dissolved protein can be directly used as a production raw material of soy protein; and the protein recovery rate in secondary foam separation is as high as possible, and the defoaming solution and the initial wastewater are mixed andadded into feed of the primary foam separation. The two-stage foam separation process can greatly improve the protein concentration ratio and enhance the recovery rate.

Description

technical field [0001] The technical scheme of the invention belongs to the field of wastewater treatment, in particular to a process for concentrating protein in soybean protein wastewater by a two-stage foam separation method. Background technique [0002] Soybean protein has a wide range of applications in the fields of food and chemical industry. So far, my country has used alkali-soluble acid precipitation to produce soybean protein, resulting in a large amount of protein-containing wastewater, which will cause serious pollution to the environment if it is directly discharged. At present, the wastewater treatment methods mainly include biochemical method, membrane separation method and ion exchange resin method. However, these methods have defects such as high investment and production costs, complicated operation process, and the like. [0003] Foam separation technology has been paid more and more attention by researchers because of its advantages of simple equipmen...

Claims

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Application Information

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IPC IPC(8): C07K1/14
Inventor 吴兆亮孙瑞娉卢珂
Owner HEBEI UNIV OF TECH
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