CN100348518C

CN100348518C - Treatment method of soybean lactalbumin waste water

Info

Publication number: CN100348518C
Application number: CNB200510019238XA
Authority: CN
Inventors: 万端极; 王广润; 凌秀菊; 高林霞; 王秀霞
Original assignee: WUHAN HUGONGDA MEMBRANE TECHNOLOGY Co Ltd
Current assignee: WUHAN HUGONGDA MEMBRANE TECHNOLOGY Co Ltd
Priority date: 2005-08-05
Filing date: 2005-08-05
Publication date: 2007-11-14
Anticipated expiration: 2025-08-05
Also published as: CN1752036A

Abstract

The present invention relates to a treating method of soybean whey wastewater, which comprises the following steps: basic protein is separated from soybean whey wastewater with an inorganic ceramic compound ultrafiltration membrane; oligosaccharide is separated from soybean whey wastewater by nanofiltration; pure water is obtained by removing inorganic salt, monosaccharide, amino acid, etc. in nanofiltration filter liquor by reverse osmosis; pure water can be recovered to be used for the soybean meal process step of alkali dissolution; the protein and the oligosaccharide can be further treated to obtain pure protein and oligosaccharide. Because the pH value of soybean whey water is kept about 4.5 in the present invention, protein in the soybean whey water can be completely separated, and the purity of oligosaccharide the recovery rate of protein are increased; the process step of ultrafiltration uses an inorganic ceramic composite membrane with highly resistance to protein pollution; the process steps of nanofiltration and reverse osmosis use novel membranes with resistance to strong alkali and acid and resistance to protein pollution; compared with common membranes, the membrane flux of the membranes is increased over 20%; the work efficiency is obviously improved; because the water resource of soybean whey is fully used and the water can be used for production, polluted water is not exhausted.

Description

Treatment method of soybean lactalbumin waste water

Technical field

The present invention relates to a kind of treatment method of soybean lactalbumin waste water, and from soya whey wastewater, extract oligose and albumen.

Background technology

The soya whey wastewater of indication of the present invention is to be in the raw material production soybean protein isolate process with the defatted soybean meal, and dregs of beans is molten through alkali, acid is heavy, the organic waste water that produces behind the albumen is extracted in centrifugation, wherein contains class materials such as albumen, oligose.Protein content 0.4～0.6%; Water-soluble sugar 0.6～0.8%; Suspended substance 0.7%; PH=4.4～4.8; Chemical oxygen demand COD: 18000～20000mg/L; Biochemical oxygen demand (BOD) BOD:8000～9000mg/L.Manufacturing enterprise generally adopts traditional pollution treatment technologies such as anaerobism, oxygen consumption that soya whey wastewater is handled the back discharging at present.Subject matter is:

1, effective ingredients such as the albumen in the soya whey wastewater, oligose are discharged with water, the waste resource;

2, not recycle of water resources;

3, the waste water disposal facility investment is big, operational management cost height;

4, the water after the processing is difficult for the stably reaching standard discharging.

Chinese patent application number 01101965 " extracting the method for soybean oligosaccharide from soybean whey water ", application number 01101967 " method of extracting soybean whey protein by super filtering " have been introduced a kind of method of extracting soybean oligosaccharide and soybean whey protein from soybean whey water respectively.The problem that this method exists is:

1, the organic membrane that adopts in its scheme, because the limitation of material, can not acid and alkali-resistance, and working temperature can not influence the film working efficiency greater than 45 ℃;

2, the pH value is 2～4 during ultrafiltration, belongs to strongly-acid, has a strong impact on the work-ing life of the ultra-filtration membrane that its scheme selects for use, and the albumen in the soybean whey can not be separated out fully, causes that oligose purity is not enough, albumen reclaims not exclusively;

3, this scheme does not relate to the advanced treatment and the reuse of water.

Summary of the invention

The present invention provides a kind of treatment method of soybean lactalbumin waste water in order to overcome defective and the problem that above-mentioned prior art exists, and this method is extracted oligose and albumen continuously from soya whey wastewater on a production line, and accomplishes the recycling of water.

Technological line of the present invention comprises following steps as shown in Figure 1:

1, ultrafiltration: soya whey wastewater with being pumped into the ultra-filtration membrane separation system, is held back sphaeroprotein and white protein in the soybean whey water, and the used film of this ultrafiltration system is that molecular weight cut-off is the inorganic ceramic composite membrane of the high anti-protein-contamination of 10KD, and this type of film is at TiO ₂Carry out on the face and covered one deck ZrO ₂, its pore size distribution is narrow, separation efficiency is high, chemical stability is good, the anti-protein-contamination ability is good, acid and alkali-resistance, high temperature resistant, and ultra-filtration membrane separation system operating pressure is 0.8～1.0MPa, and working temperature is 55～65 ℃;

2, nanofiltration: the filtrate that above-mentioned ultra-filtration and separation goes out is paid the filtration of filter membrane separation system, hold back the oligose in the soybean whey water, the used film of this nanofiltration system is the composite nanometer filtering film of 0.8～1.2nm for seeing through the aperture, this type of film acid and alkali-resistance, anti-protein-contamination, nanofiltration membrane separation system works pressure is 1.0～3.0MPa, and working temperature is 40～45 ℃;

3, reverse osmosis: the filtrate that above-mentioned nanofiltration separation goes out is handed over the reverse osmosis membrane separation system filtration, remove the class materials such as inorganic salt, monose and amino acid in the nanofiltration filtrate, reverse osmosis filtrate is pure water, can be back to the molten operation of dregs of beans alkali, film separating system operating pressure 2.5～3.2MPa that this reverse osmosis system is used, working temperature is 40～45 ℃;

4, decolouring: with the concentrated solution of nanofiltration oligosaccharide syrup activated carbon decolorizing just, the used gac of the present invention is 100～120 order powderies, and add-on is the 2nd to go on foot 2～3% of gained oligosaccharide syrup, and bleaching time is 10～20 minutes;

5, take off charcoal: the oligosaccharide syrup that will add gac enters strainer and filters, and holds back gac, and the used strainer of the present invention is the PE accurate filter in 0.1～0.8 μ m aperture;

6, the present invention extracts and also includes in the process program of oligose oligosaccharide syrup adjust pH spray-dired operation to neutral, the double-effect evaporation;

7, the present invention extracts and also includes albumen adjust pH that ultrafiltration is held back spray-dired operation to neutral, the double-effect evaporation in the proteic process program.

Technical scheme beneficial effect provided by the present invention is:

1, total system adopts membrane separation technique, has avoided the traditional heating flocculence destruction to material properties.

2, ultrafiltration operation has been selected the inorganic ceramic composite membrane for use, and the anti-protein-contamination film of novel anti-high soda acid has been selected in nanofiltration and reverse osmosis for use, improves membrane flux respectively more than 20%, obviously increases working efficiency.

3, this programme concentrates with the film system and has reduced conventional economic benefits and social benefits or the spissated load of multiple-effect evaporation, has reduced a large amount of energy consumptions.

4, made full use of the water resources of soybean whey, made water be back among the production without sewage discharge.

Description of drawings

Fig. 1 is a process route view of the present invention.

Embodiment

A factory that produces 2500 tons of soybean protein isolates per year produces soybean whey water 250m every day ³, wherein albumen is 0.41%, and total reducing sugar is 0.77%, comprises that oligose is 0.63%, and sucrose is 0.14%, designs in 20 hours by working every day, on average per hour handles whey 12.5m ³At first whey water is handled with being pumped into the ultra-filtration membrane separation system, ultra-filtration membrane is that molecular weight cut-off is the inorganic ceramic composite membrane of the high anti-protein-contamination of 10KD, and system pressure is 0.8～1.0MPa, and working temperature is 60 ℃, and the enriched material after the ultra-filtration and separation has 15m ³, wherein contain albumen 5.8%, send into albumen storage tank adjust pH and transfer to neutrality, concentrate back friendship spraying drying through double-effect evaporation, obtain protein content and be 1.3 tons of 65% protein powders; Filtrate 230m after the ultra-filtration and separation ³Pay the filter membrane separation system and handle, nanofiltration membrane is the composite nanometer filtering film in 1.0nm aperture, and system pressure is 2.0MPa, and working temperature is 45 ℃, concentrate about 10 times after, its concentrated solution has 23m ³, for containing the syrup of oligose 7.9%, with turning over a finished item property of syrup carbon decoloring, after 0.5 μ m aperture PE strainer took off charcoal, adjust pH transferred to neutrality, and double-effect evaporation concentrates the back, and to hand over spraying drying to obtain total sugar content be 1.5 tons in 90% oligose dry powder; The isolated filtrate of nanofiltration system is 207m ³, the reverse osmosis system of handing over reverse osmosis membrane to form is handled, and system pressure is 3.0MPa, and working temperature is 45 ℃, obtains about 180m after treatment ³Pure water can return the molten operation of alkali of dregs of beans.

After adopting technical scheme provided by the invention, the oligose rate of recovery of soybean whey water is greater than 75%, and protein recovery is greater than 85%.Calculate 450 tons in this factory's year production of high purity oligose dry powder at 300 days on working days per year; 390 tons of protein powders; Year is saved water resources 5.4 ten thousand m ³And realized without sewage discharge.

Claims

1, a kind of treatment method of soybean lactalbumin waste water, this method is carried out according to the following steps: (1), ultrafiltration: hand over the ultra-filtration membrane separation system to filter in soybean whey water, hold back albumen and other microorganisms in the soybean whey water, the used film of described ultrafiltration system is that molecular weight cut-off is the inorganic ceramic composite membrane of 10KD, ultra-filtration membrane separation system operating pressure is 0.8～1.0MPa, and working temperature is 55～65 ℃; (2), nanofiltration: above-mentioned ultra-filtration and separation is gone out filtrate pay the filtration of filter membrane separation system, hold back the oligose in the soybean whey water, the used film of described nanofiltration system is the composite nanometer filtering film of 0.8～1.2nm for seeing through the aperture, nanofiltration membrane separation system works pressure is 1.0～3.0MPa, and working temperature is 40～45 ℃; (3), reverse osmosis: the filtrate that above-mentioned nanofiltration separation goes out is handed over the reverse osmosis membrane separation system filtration, remove inorganic salt, monose and amino acids material in the nanofiltration filtrate, reverse osmosis filtrate is pure water just, the recyclable molten operation of dregs of beans alkali that is used for, the used film of described reverse osmosis system is the reverse osmosis membrane of the anti-protein-contamination of anti-high soda acid, reverse osmosis membrane separation system works pressure 2.5～3.2MPa, working temperature is 40～45 ℃.