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Directional Fermentation of Butyric Acid from Taihu Lake Blue-green Algae

Author: LvZuo
Tutor: RuanWenQuan
School: Jiangnan University
Course: Environmental Engineering
Keywords: blue algae butyric anaerobic digestion granular sludge
CLC: TQ921.4
Type: Master's thesis
Year: 2010
Downloads: 96
Quote: 0
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Abstract


In recent years, the blue algae bloomed frequently in Taihu Lake. And a lot of blue algae were salvaged as a method of eutrophication control. Blue algae are a kind of biomass resources with variety of useful material, which are worth being intensively researched. It is of great social and economic significance to make the pollution into resources. In this paper, the optimum conditions for utilizing blue algae as raw material to fermentation butyric acid were studied, provided a theoretical basis and technical support for the utilization of blue algae. The results were as follows:(1) The methods to enhance the efficiency of anaerobic digestion were investigated. The results showed that different initial pH value and various pretreatments could increase the butyric acid production at different level. When the initial pH value is 5, the fermentation can get the maximum butyric acid production of 2570 mg/L,which is obviously higher than control. The heat treatment was optimized at the temperature of 80℃and the processing time of 30 min. The optimum pH value was 4 of 24 h during acid treatment. The optimum pH value was 10 of 24 h during alkali treatment. The optimum time was 4 min during microwave treatment. Among various pretreatments, the butyric acid production from blue algae through anaerobic fermentation in turn is alkali treatment>heat treatment>microwave treatment>acid treatment>control, the productions of butyric acid and organic acid of blue algae fermentation after alkali treatment are 4390 mg/L and 5962 mg/L.(2) Four kinds of organic acids (lactic acid, acetic acid, propionic acid, butyric acid) stress were adopted in this experiment to pre-treat the anaerobic granular sludge, then blue algae were inoculated with stressed sludge to produce butyric in order to evaluate the effect of stress on increasing butyric production. The results indicated that the tolerance of acid in sludge could be improved, thereby increasing butyric yield. The results show that the mixed organic acids which contains 2 g/L lactic acid,6 g/L acetic acid,5 g/L propionic acid and 12 g/L butyric acid has the best effect, the maximum butyric yield could reach 10252 mg/L, which improved by 139% compared to control, respectively. The assay of protease and phosphatase activity during the fermentation in our study indicated that the appropriate concentration of organic acid stress could enhance the acid tolerance response of anaerobic sludge, improve enzyme activities, and ultimately raise the butyric yield.(3) In order to find out the optimum nutriment and concentration, four kinds of nutrients(Fe、Fe2+、Ni2+and yeast extract) with different concentrations were added. The result showed:adding yeast extract to the fermentation system had the best promote effect, the optimum adding concentration is 0.25 g/L. Under the condition, it could get 6803 mg/L butyric acid which is 1.90 times that of control. The promote effect of other nutrients from high to low in turn is Fe2+(concentration is 0.1 g/L), Ni2+(concentration is 0.2 mg/L) and Fe (concentration is 0.5 g/L). Then the effect of nutriment on kinetic parameter of butyric yield from blue algae fermentation was discussed, the result showed that:adding appropriate amount of four kinds of nutrients all can raise the butyric yield and maximum specific butyric yield speed. The promote effect from high to low in turn is yeast extract> Fe2+> Ni2+> Fe.

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CLC: > Industrial Technology > Chemical Industry > Other chemical industries > Fermentation industry > Fermentation of the legal system of organic acids > Butyric acid
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