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Membrane separation process of treating soybean processing waste water

A technology for processing wastewater and membrane separation, which is applied in the direction of osmosis/dialysis water/sewage treatment, ultrafiltration, etc. It can solve problems such as poor quality, polluted equipment operation, and low concentration, and achieve low equipment investment and operating costs and improved product quality. , the effect of mitigating the impact

Inactive Publication Date: 2002-02-20
TSINGHUA TONGFANG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them: the treatment effect of the anaerobic-aerobic biological treatment method is unstable; the evaporation concentration method consumes a lot of energy, equipment investment and operating costs are high, and it is difficult to promote in industry; the quality of the products obtained by the fermentation method is poor, mostly small molecules Protein sugar, the concentration is relatively dilute; the ultrafiltration-reverse osmosis-electrodialysis method has the disadvantages of membrane fouling and complicated equipment operation

Method used

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  • Membrane separation process of treating soybean processing waste water
  • Membrane separation process of treating soybean processing waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1): Pretreatment: collect the soybean processing wastewater into the wastewater tank, and enter the pretreatment device through the wastewater booster pump. Preliminary treatment of soybean processing wastewater: add an appropriate amount of sodium hydroxide to the soybean processing wastewater to make the pH of the soybean processing wastewater 8; then add flocculant CaCl 2 To remove the fat in the soybean processing wastewater, the added CaCl 2 According to the amount of Ca in soybean processing wastewater 2+ After the addition, the content is determined to be about 200 mg / l; then the soybean processing wastewater is centrifuged to remove the flocculation sediment; the clarified soybean processing wastewater is pre-filtered and micro-filtered to remove particles above 5 μm and 0.2 μm respectively and bacteria, etc.; finally, adjust the temperature of the aforementioned treated soybean processing wastewater to keep it at about 45°C;

[0017] Step 2): Ultrafiltra...

Embodiment 2

[0021] Step 1)~step 3) of the present embodiment are identical with embodiment 1:

[0022] Step 4): post-treatment: carry out aerobic biological treatment on the nanofiltration membrane permeate liquid obtained in step 3 according to the prior art, and the treated water meets the relevant national sewage discharge standards, and is discharged according to regulations.

Embodiment 3

[0024] Step 1): Pretreatment: collect the soybean processing wastewater into the wastewater tank, and enter the pretreatment device through the wastewater booster pump. Preliminary treatment of soybean processing wastewater: add an appropriate amount of sodium hydroxide to the soybean processing wastewater to make the pH of the soybean processing wastewater 7; then add flocculant CaCl 2 To remove the fat in the soybean processing wastewater, the added CaCl 2 According to the amount of Ca in soybean processing wastewater 2+ After the addition, the content is determined to be about 300 mg / l; then the soybean processing wastewater is centrifuged to remove the flocculation sediment; the clarified soybean processing wastewater is pre-filtered and micro-filtered to remove particles above 5 μm and 0.2 μm respectively and bacteria, etc.; finally, adjust the temperature of the soybean processing wastewater after the aforementioned treatment to keep it at 40°C;

[0025] Step 2): Ultra...

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Abstract

The present invention relates to method of treating soybean processing waste water by using membrane filtration technique, the soybean processing waste water is pretreated through pH value regulation, centrifuge, prefiltration, microfiltration, and temp regulation etc; then the pretreated soybean processing waste water is passed through ultrafiltration membrane system under pressure to extract soybean lactoalbumin; then the filtrate from ultrafiltration membrane is passed through nm filtration membrane system under pressure to extract soybean oligosaccharide which is further decolorized; the filtrate from nm filtration membrane system is post treated to obtain water suitable for use in production or water conformed with state discharge standard. Advantages: low cost, high purity of soybean lactoalbumin and oligosaccharide.

Description

technical field [0001] The invention relates to a treatment method for food waste processing water, in particular to a method for treating soybean processing waste water by membrane separation. Background technique [0002] At present, domestic soybean factories basically extract 1 / 3 of the protein from the raw materials, and 1 / 3 of the carbohydrates are turned into waste residues for low-cost treatment, and 1 / 3 of the mixture of whey protein and soluble carbohydrates are regarded as Waste water is discharged in vain, its resource utilization rate is extremely low, the overall benefit is very poor, and it also causes serious environmental pollution. Therefore, how to extract whey protein and oligosaccharides from soybean processing wastewater, recycle and reuse or discharge water up to standard is an important high-tech to solve major problems such as energy, resource crisis and environmental pollution. At present, the most widely used treatment methods for soybean processi...

Claims

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Application Information

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IPC IPC(8): B01D61/14C02F1/44
Inventor 王占生罗敏
Owner TSINGHUA TONGFANG CO LTD
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