产酸相反应器快速启动和乙醇型发酵菌群驯化

Rapid start-up of acidogenic reactor and acclimatization of dominant ethanol-type fermentation population

在有机废水产酸发酵类型中 ,产酸相的乙醇型发酵被认为是两相厌氧生物处理系统中的最佳发酵类型 ,如何实现产酸相微生物菌群的乙醇型发酵 ,是提高系统处理能力的关键因素之一 .通过模型反应器的小试研究和中试规模的反应器运行 ,证明了利用不同性质活性污泥对产酸相反应器进行快速启动的可行性 ,并探索了产酸相乙醇型发酵菌群的驯化途径 .研究证明 ,在污泥接种量≮ 6 .5 gVSS/L的前提下 ,将进水COD质量浓度、HRT和pH值分别控制在 30 0 0～ 5 0 0 0mg/L、8.0～ 10 .6h和 4 .5～ 7.0的范围时 ,可在 2 0d内完成产酸相的快速启动 ,并可在 4 5d左右实现对乙醇型发酵菌群的驯化 .

Ethanol type fermentation with acidogenic phase was believed to be better than butyric type fermentation and propionic type fermentation in a two phase anaerobic treatment system. It is important to keep a high efficiency in the treatment process by controlling the acidogenic phase to realize ethanol type fermentation. Two kinds of different activated sludge were used as inoculants to start up the continuous flowing and high rate acidogenic reactors in this study. The results showed by the start up tests of a modal reactor and a pilot scale reactor that both anaerobic and aerobic activated sludge were suitable under certain conditions. When the biomass of inoculants was not less than 6.5 gVSS/L and the influent concentration, HRT and pH were within the ranges of 3 000～5 000 mgCOD/L, 8～10.6 h and 4.5～7.0,respectively, the acidogenic reactors could work effectively for 20 days from the start up. On the other hand, the preponderant population of ethanol type fermentation in the acidogenic reactors could be obtained within 45 days under the same conditions.