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

摘要： 污泥厌氧消化产短链脂肪酸是实现污泥资源化的重要途径，短链脂肪酸不仅是产甲烷的底物、污水脱氮除磷的碳源，而且可以作为原料产生一系列高附加值的产品。本文介绍了污泥厌氧消化产有机酸的机理，重点阐述了污泥性质、温度、pH值、碳氮比（C/N）、水力停留时间（HRT）和固体停留时间（SRT）等影响污泥厌氧消化产酸的主要因素及研究进展，指出这些因素通过改变底物性质、微生物活性及二者接触反应时间等对产酸过程产生影响，其中温度和pH值是研究热点，目前大多数研究者认为高温和碱性条件更有利于污泥产酸。此外，还论证了这些影响因素对于实现污泥产酸最大化的重要意义，提出各因素之间的相互关系以及通过调控温度、pH值、碳氮比等发酵影响因素来控制产酸类型是今后值得研究的方向。

关键词: 污泥, 厌氧消化, 短链脂肪酸, 影响因素