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Method for advanced treatment of yeast waste water

A yeast wastewater, advanced treatment technology, applied in adsorption water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of restricting the sustainable development of the industry, high COD concentration, dark color of effluent, etc., and reduce sludge volume. , The effect of reducing precipitation time and low operating cost

Inactive Publication Date: 2008-05-07
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are deficiencies in the biochemically treated yeast wastewater (or yeast wastewater biochemical effluent) obtained after the biochemical treatment process: 1. After traditional biochemical treatment of yeast wastewater, because the pigment (melanoid) in the wastewater is difficult to be degraded by microorganisms, the color of the effluent Very deep; 2. High COD concentration
The current treatment of yeast wastewater lags behind the development of the industry, which has affected enterprises and even restricted the sustainable development of the entire industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for the advanced treatment of yeast wastewater, comprising the following steps: adding an inorganic flocculant—ferric chloride to the yeast wastewater biochemical effluent obtained after biochemical treatment of the yeast wastewater produced in the yeast production process, and the COD concentration of the yeast wastewater biochemical effluent is 1000mg / L, add 3.5g (12.95mM Fe 3+ ) ferric chloride, first stir at 500rpm for 1min; reduce the rotational speed to 40rpm; then add 2mg of cationic polyacrylamide per liter of yeast wastewater biochemical effluent, and stir slowly for 10min. After the stirring process is completed, it enters the clarification tank for solid-liquid separation. COD and chroma removal rates were 86% and 96% respectively. The concentration of organic matter (COD) in the supernatant dropped to 140 mg / L, and the pH of the supernatant (flocculation effluent) was 4.4. The flocs produced by flocculation can be completely settled within 15 minu...

Embodiment 2

[0025] A method for the advanced treatment of yeast wastewater, comprising the following steps: adding inorganic flocculant—aluminum sulfate to the yeast wastewater biochemical effluent obtained after biochemical treatment of the yeast wastewater produced in the yeast production process, and the COD concentration of the yeast wastewater biochemical effluent is 1000 mg / L, add 4.5g (13.5mM Al 3+ ) aluminum sulfate, first stir at 300rpm for 2min; reduce the rotational speed to 40rpm; then add 10mg of cationic polyacrylamide per liter of yeast wastewater biochemical effluent, and then slowly stir for 10min. After the stirring process is completed, it enters the clarification tank for solid-liquid separation. COD and chroma removal rates were 66% and 87%, respectively. The concentration of organic matter (COD) in the supernatant dropped to 340mg / L, and the pH value of the supernatant (flocculation effluent) was 5.3. The flocs can settle completely within 10 minutes.

Embodiment 3

[0027] A method for the advanced treatment of yeast wastewater, which includes the following steps: adding inorganic flocculant—polyaluminum chloride to the yeast wastewater biochemical effluent obtained after biochemical treatment of the yeast wastewater produced in the yeast production process, and the COD concentration of the yeast wastewater biochemical effluent 1000mg / L, add 6.0g of polyaluminium chloride per liter of yeast wastewater biochemical effluent, first stir at 500rpm for 1min; reduce the speed to 40rpm; then add 2mg of cationic polyacrylamide per liter of yeast wastewater biochemical effluent , and then stirred slowly for 10 min. After the stirring process is completed, it enters the clarification tank for solid-liquid separation. COD and chroma removal rates were 75% and 91%, respectively. The COD concentration in the supernatant dropped to 250mg / L, and the pH value of the supernatant (flocculation effluent) was 5.5.

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Abstract

The invention relates to an advanced treatment method of yeast waste water, the advanced treatment method of yeast waste water is characterized in that the following steps are included: the inorganic flocculant is added in yeast waste water biochemical water after biochemical treatment, and quickly stirred in a stirring rotation rate ranging from 300 to 600 revolutions per minute; wherein, the inorganic flocculant is aluminium salt or iron salt, and the adding amount of the inorganic flocculant complies with that: 11to 15mM Fe3+ or Al3+ is added into a gram COD of yeast waste water; and then the organic flocculant is added and stirred; the organic flocculant is cation type polyacrylamide, 2 to 10 milligrams of organic flocculant is added in each liter of yeast waste water biochemical water; after stirring, the mixture enters into the settling pond for separating the solid from the liquid as well as settling the flocculation; the supernatant solution is directly discharged or further removed the COD and the chrominance by active carbon absorption. The invention has advantages of high removal rate of COD and chrominance.

Description

technical field [0001] The invention relates to a method for advanced treatment of yeast wastewater. Background technique [0002] Yeast wastewater is a kind of industrial wastewater produced by fermentation process and centrifugal separation and drying of fermentation liquid to make yeast. Yeast wastewater is characterized by brown-black wastewater and high concentration of organic matter: the yeast wastewater separated from the yeast liquid fermentation tank has a COD as high as 50,000-100,000 mg / L. [0003] Yeast wastewater is generally treated by traditional anaerobic / aerobic biochemical methods (Benito, G.G. (1997) Decolorization of wastewater from an alcoholic fermentation process with trametesversicolor. Bioresource Technology, 61: 33-37.). However, there are deficiencies in the biochemically treated yeast wastewater (or yeast wastewater biochemical effluent) obtained after the biochemical treatment process: 1. After traditional biochemical treatment of yeast wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56C02F1/28
Inventor 梁震周瑜王焰新
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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