Method for producing gamma-polyglutamic acid from activated sludge and straws through fermentation
A technology of polyglutamic acid and activated sludge is applied in the field of bioengineering, which can solve the problem of high cost of fermentation medium and achieve the effect of low treatment cost
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[0023] Example 1
[0024] Use the following method to prepare γ-polyglutamic acid:
[0025] 1. The straw is crushed mechanically and sieved through a 20-40 mesh sieve.
[0026] 2. Use a plate and frame filter press to dehydrate the sludge to reduce the moisture content of the sludge cake to below 75% and mix it with straw. The mixing ratio of sludge and straw: straw 30%, activated sludge 70 %.
[0027] 3. Add 1mol / L nitric acid solution until the sludge and straw are completely immersed, and hydrolyze at 70℃ for 3h.
[0028] 4. After the hydrolysate is naturally cooled to room temperature, add 10mol / L sodium hydroxide solution to adjust the pH to 7.0, and centrifuge at 4000r / min to obtain the hydrolysate.
[0029] 5. Add 4% sodium glutamate to each 1000mL hydrolysate to make a fermentation medium, sterilize at 121°C for 15 minutes for later use.
[0030] 6. Inoculate 3% Bacillus subtilis Z-115, and ferment for 80h at 37°C.
[0031] 7. Centrifuge the fermentation broth at 4000r / min for 1...
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[0032] Example 2
[0033] The method of Example 1 is used to prepare γ-polyglutamic acid. The difference is that the mixing ratio of sludge and straw used in step 2 is 80% straw and 20% activated sludge; the process used in step 3 is: adding 1 mol / L nitric acid solution, until immersed in sludge and straw, hydrolyze at 85 ℃ for 2h. The final yield of γ-polyglutamic acid was 9.4 g / L.
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[0034] Example 3
[0035] The method of Example 1 was used to prepare γ-polyglutamic acid. The difference is that the process used in step 6 is: inoculate 5% of Bacillus subtilis, ferment for 90h at 37°C, and finally γ-polyglutamic acid The yield is 10.2g / L.
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