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Method for treatment of silk degumming wastewater and recovery of silk gum

A technology for wastewater and sericin, which is applied in the field of wastewater treatment, silk floss degumming wastewater treatment and sericin recovery, can solve the problems of sericin protein easily deteriorated, low retention rate, difficult to adjust pH value, etc., and achieves subsequent processing. The purification and application are convenient, the treatment method is simple, and the effect of maintaining chemical properties

Inactive Publication Date: 2012-01-25
SUZHOU UNIV +1
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AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned treatment method has the following problems: (1) acid analysis is carried out by using commonly used hydrochloric acid, and the pH value of the system is difficult to adjust; It is especially obvious when it is used, causing a large amount of recovered sericin protein to deteriorate; (3) the waste water COD treated above Cr Removal rate is about 70%, does not reach the discharge requirement of national standard; (4) the ultrafiltration membrane that adopts is polysulfone hollow fiber membrane, finds in actual use, and its rejection rate is lower, is difficult to meet the demand of industrial production; ( 5) The above-mentioned methods for the treatment of silk wastewater and the recovery of sericin are only in the laboratory research stage, and the pollution and clogging of the ultrafiltration membrane in the treatment of silk wastewater have not been considered, so they cannot be industrialized

Method used

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  • Method for treatment of silk degumming wastewater and recovery of silk gum
  • Method for treatment of silk degumming wastewater and recovery of silk gum

Examples

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Effect test

Embodiment 1

[0027] A method for treating silk floss degumming waste water and reclaiming sericin, comprising the steps of:

[0028] (1) carry out primary filtration to waste water;

[0029] (2) Precipitation is carried out by the acid analysis method, and the citric acid is added dropwise to the waste water while stirring. The stirring rate is 60 rpm. 3. At 8 o'clock, stop adding acid and stirring, let it stand for stratification, and after 2 hours, the stratification is stable, and it is divided into supernatant liquid and lower layer precipitation;

[0030] (3) Pour the supernatant and pass through the ultrafiltration membrane to obtain the first filtrate and the first concentrated solution; the lower precipitate is diluted with deionized water and then passed through the ultrafiltration membrane to remove the contained Salt, obtain the second filtrate and the second concentrate; The ultrafiltration membrane is a hollow fiber ultrafiltration membrane with a molecular weight cut-off of ...

Embodiment 2

[0041]A treatment method for silk floss degumming wastewater. In the pilot test stage, the amount of silk degumming wastewater is 8 tons a day. The wastewater first passes through grids and screens with a distance of 25 mm to remove coarse solid impurities, and then is discharged into a volume of 10m 3 It is located in the regulating pool below the ground, and then, use the ZS50-32-200 / 3.0 stainless steel horizontal single-stage centrifugal pump to input the wastewater in the regulating pool into the precision filter (with a non-woven filter bag with a pore size of 10 μ inside), and filter After the solid impurities larger than 10μ are removed, they are discharged into the isoelectric point precipitation tank on the platform; the volume of the precipitation tank is 1.5m 3 , the actual amount of wastewater treated each time is 1m 3 , the height on the platform is made of PVC plastic or ceramics, and the volume is 0.08m 3 citric acid tank, when operating, wait for the amount of...

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Abstract

The invention discloses a method for treatment of silk degumming wastewater and recovery of silk gum. The method comprises the following steps of: (1) primarily filtering the wastewater; (2) settling the wastewater by using an acid separation method to divide the wastewater into supernatant and lower sediment; (3) pouring the supernatant through an ultrafiltration membrane to obtain first filtrate and first concentrate, diluting the lower sediment with de-ionized water and allowing the sediment to pass through the ultrafiltration membrane to obtain second filtrate and second concentrate; (4) combing the first filtrate of the supernatant and the second filtrate of the lower sediment and further filtrating the combined filtrate with a nanofiltration membrane to obtain wastewater filtrate and third concentrate; and (5) combining the first concentrate and the second concentrate in the step (3) and the third concentrate in the step (4) and then performing spray drying to prepare silk gum protein powder. The recovery rate of the silk gum is as high as 99 percent; and the finally obtained filtrate meets national emission requirement and has environmental friendliness.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating silk floss degumming waste water and recovering sericin, and belongs to the fields of sewage treatment technology and resource recycling. Background technique [0002] Silk is mainly composed of 70% to 80% silk fibroin, 20% to 30% sericin coated on the periphery, and a small amount of wax and inorganic substances. During the cocoon cooking process, most of the sericin is dissolved in the cocoon cooking wastewater (CCW) by sodium carbonate in the cocoon cooking solution, and in the subsequent refining process, the remaining sericin is further dissolved in the cocoon cooking wastewater by sodium carbonate Degumming wastewater (silkdegumming wastewaters SDW). Therefore, the above-mentioned silk wastewater contains high concentration of sericin, and its turbidity and COD are also high. If it is directly discharged without treatment, it will seriously damage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C07K14/78C07K1/34C02F1/66C02F1/44
Inventor 陈国强邢铁玲盛家镛孙林李克弯孙道权潘世俊陈忠立刘华平
Owner SUZHOU UNIV
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