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| Enhanced production of short-chain fatty acids from waste activated sludge alkaline fermentation: The effect of sa-linity |
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Abstract Short chain fatty acids (SCFAs) were used as high quality carbon source for biological denitrification and phosphorus removal process. In order to improve the SCFAs production of waste activated sludge (WAS) in alkaline fermentation system, the effect of salinity (0~25g/L) on the WAS alkaline fermentation (pH=10) was studied at 20℃ and 35℃,respectively. The results showed that adding appropriate sodium chloride (NaCl) enhanced the SCFAs production. The highest accumulation of SCFAs appeared at 15g/L NaCl and improved by 42.3% (20℃) and 15.0% (35℃) comparing with no NaCl addition. Further researches indicated that adding NaCl could increase the release of substrate (protein and polysaccharide) to produce more SCFAs, accompanied by the increase of C/N (SCFAs/NH4+-N). Therefore, the integrated control of salinity and pH could enhance the SCFAs generation from WAS fermentation and promote WAS reduction simultaneously.
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Received: 19 November 2014
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