污泥发酵产酸强化技术研究及应用进展

Progress in Research and Application of Technology to Enhance Volatile Fatty Acids Production in Waste Activated Sludge Fermentation

污水氮磷排放不达标,剩余污泥处理率低是当前污水处理厂亟待解决的两大问题。由剩余污泥厌氧水解发酵产生的挥发性脂肪酸,可以作为易生物利用的碳源提高污水脱氮除磷效率,因此如何获取富含挥发性脂肪酸的污泥发酵液,实现污水与污泥的共同治理受到了广泛关注。该文综述了国内外污泥厌氧发酵产酸的研究进展;介绍了影响污泥发酵产酸过程的各因素(主要包括pH值、温度、停留时间、氧化还原电位、碳氮比等)及作用机理;重点阐述了各种提高水解效率及产酸量的强化技术(超声、热、碱、臭氧及生物强化等)及其优缺点;基于可行性和成本效益,分析了现行强化技术存在的不足;并提出了后续研究的问题和方向。

This paper reviewed the technology to enhance anaerobic fermentation of waste activated sludge （WAS） in municipal wastewater treatment plants, especially focused on the volatile fatty acids （VFAs） produced in the process of WAS fermentation, which can be easily used as carbon sources for microorganisms, which on the other hand can improve biological nutrients （nitrogen and phosphorus） removal efficiency in wastewater treatment; thus, much attention has been attached to technology to obtain the fermentation liquid rich in VFAs. In this paper; factors affecting WAS fermentation and the mechanisms were presented; and various techniques to enhance were introduced, their advantages as well as limitations were emphasized on the basis of the cost-benefit analysis.