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Method for recycling of soybean whey wastewater by membrane separation technology

A technology of soybean whey wastewater and whey wastewater, which is applied in the preparation method of peptides, chemical instruments and methods, applications, etc., can solve the impact on the quality, membrane flux and service life of membrane separation whey protein and oligosaccharide syrup Huge, affecting the normal use of the membrane and other problems, to solve the pollution and separation efficiency drop, improve the comprehensive utilization rate, realize the effect of economic and environmental benefits

Inactive Publication Date: 2014-12-17
上海诚洲科技中心(有限合伙)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The scheme disclosed in this patent has the following problems: (1) The whey wastewater is not sterilized and pretreated, and the wastewater is prone to rancidity, which seriously affects the efficiency of membrane separation and the quality of recovered whey protein and oligosaccharide syrup; (2) Flocculation treatment of whey wastewater to remove impurities such as globulin and fat causes serious pollution of the membrane elements during the actual operation of the membrane process in industrial production, which has a huge impact on the membrane flux and service life. The service life of the membrane is usually only about half a year; (3 ) The membrane process design adopts the circulation concentration separation method, which also causes the membrane flux to decay rapidly and the separation efficiency to drop sharply, which seriously affects the normal use of the membrane; Many globulins, the purity is not high

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  • Method for recycling of soybean whey wastewater by membrane separation technology

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Comparison scheme
Effect test

Embodiment 1

[0033] [Example 1] such as figure 1 Shown, a kind of membrane separation process recycles the method for soybean whey waste water, and it comprises the following steps:

[0034] S1: pretreatment sterilization: heating whey wastewater to 100°C for sterilization;

[0035] S2: Flocculation and centrifugal separation to remove impurities: adjust the pH value of the sterilized whey wastewater to 7.5, adjust the temperature to 50°C, and add CaCl 2 Fully flocculate for 30 minutes, and then use a 9000rpm centrifuge to remove the precipitate formed by impurities, and the light transmittance of the filtrate reaches 81%;

[0036]S3: Continuous separation and recovery of whey protein by ultrafiltration membrane: the whey wastewater after filtering and removing impurities enters the ultrafiltration membrane module. After separation and concentration, the concentrate and dialysate are directly discharged from the membrane module as two streams of effluent. Automatic washing and diafiltr...

Embodiment 2

[0042] [Example 2] such as figure 1 Shown, a kind of membrane separation process recycles the method for soybean whey waste water, and it comprises the following steps:

[0043] S1: pretreatment sterilization: heat the whey wastewater to 80°C for sterilization;

[0044] S2: Flocculation and centrifugal separation to remove impurities: adjust the pH value of the sterilized whey wastewater to 7.0, adjust the temperature to 80°C, and add CaCl 2 After fully flocculating for 50 minutes, the precipitate formed by impurities was removed by a 4000rpm centrifuge, and the light transmittance of the filtrate reached 82%;

[0045] S3: Continuous separation and recovery of whey protein by ultrafiltration membrane: the whey wastewater after filtering and removing impurities enters the ultrafiltration membrane module. After separation and concentration, the concentrate and dialysate are directly discharged from the membrane module as two streams of effluent. Automatic washing and diafilt...

Embodiment 3

[0051] [Example 3] such as figure 1 Shown, a kind of membrane separation process recycles the method for soybean whey waste water, and it comprises the following steps:

[0052] S1: pretreatment sterilization: heating whey wastewater to 90°C for sterilization;

[0053] S2: Flocculation and centrifugal separation to remove impurities: adjust the pH value of the sterilized whey wastewater to 7.2, adjust the temperature to 65°C, and add CaCl 2 After fully flocculating for 40 minutes, the sediment formed by impurities was removed by a 6500rpm centrifuge, and the light transmittance of the filtrate reached 82%;

[0054] S3: Continuous separation and recovery of whey protein by ultrafiltration membrane: the whey wastewater after filtering and removing impurities enters the ultrafiltration membrane module, and the ultrafiltration membrane adopts a negatively charged ultrafiltration membrane with a molecular weight cut-off of 3000-5000, and adopts a continuous separation and concent...

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Abstract

The invention discloses a method for recycling of soybean whey wastewater by a membrane separation technology. The method includes: sterilization pretreatment; flocculation and centrifugal separation for impurity removal; whey protein recovery by ultrafiltration membrane continuous separation; whey protein powder recovery; oligosaccharide syrup recovery by nanofiltration membrane continuous concentration; oligosaccharide recovery; and dialysis water recovery by reverse osmosis membrane continuous concentration. The method provided in the invention can avoid whey wastewater rancidity and ultrafiltration membrane pollution and plugging, and improves the product quality. Employment of the continuous separation concentration mode reduces stay of intercepted objects or protein, impurity concentrated liquors in a membrane assembly to the utmost, and back-and-forth circulation between a membrane liquid inlet tank and a membrane system no longer exists. Meanwhile, the membrane surface flow speed is controlled, so that the problems of membrane pollution and low separation efficiency are solved. An osmosis filtration membrane washing process is adopted, and water is added automatically for filter wash, so that the membrane pollution and plugging problems are solved, and the product quality is improved. The selection of high temperature resistant hydrophilic membrane materials guarantee a high water flux and help to reduce membrane pollution.

Description

technical field [0001] The invention relates to a method for recycling soybean whey wastewater by a membrane separation process. Background technique [0002] Soybean protein is a high-tech vegetable protein product made by modifying soybean protein by applying modern biochemical engineering technology. It has high nutritional and economic value and is widely favored by people. Since the 1970s, the production of soybean protein has developed rapidly in all countries in the world. As the hometown of soybeans, our country has a long history of soybean food production. In recent years, the country has invested a lot of manpower and material resources in the development of new soybean protein food industry. [0003] Soy whey wastewater is produced in the process of soybean protein isolate, mainly from the processes of alkali-soluble acid precipitation supernatant and water washing, and its main components are a small amount of unprecipitated soybean globulin, rich whey protein ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K1/34C07K14/76C13K13/00
Inventor 邱全国
Owner 上海诚洲科技中心(有限合伙)
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