关键词: 污泥, 厌氧消化, 短链脂肪酸, 影响因素

Abstract: Bio-production of short-chain fatty acids (SCFAs) under anaerobic digestion can be an important way to recycle excess sludge. SCFAs could be used to generate methane，to remove nitrogen and phosphorous from wastewater as carbon sources added in wastewater treatment plants(WWTP)，and to make valuable products，such as PHA etc. This paper reviewed the mechanism of acidogenesis process during sludge anaerobic digestion，focusing on the most important impact factors such as the sludge characteristics，fermentative temperature，pH value，carbon to nitrogen ratio(C/N)，hydraulic retention time(HRT) and the solids retention time(SRT). These impact factors could affect the SCFAs production by changing the substrates characteristics，microbial activities and the reaction time between substrates and microbes. Temperature and pH value obtained more attention in recent research and it was reported that higher fermentation temperatures and alkaline conditions were more suitable for the acidogenesis process. It is important to investigate the suitable fermentative conditions for excess sludge to maximize SCFAs production under anaerobic digestion. The relationship among the impact factors and adjusting the impact factors to control of SCFs production can become a promising research direction in future.

Key words: sludge, anaerobic digestion, short-chain fatty acids, impact factors