Department of Civil Engineering, University of Manitoba, 15 Gillson Street, Winnipeg, Manitoba, Canada R3T 5V6.
Water Res. 2009 Dec;43(20):5180-6. doi: 10.1016/j.watres.2009.08.019. Epub 2009 Aug 22.
Laboratory scale, room temperature, semi-continuous reactors were set-up to investigate the effect of solids retention time (SRT, equal to HRT hydraulic retention time) and biomass concentration on generation of volatile fatty acids (VFA) from the non-methanogenic fermentation of waste activated sludge (WAS) originating from an enhanced biological phosphorus removal process. It was found that VFA yields increased with SRT. At the longest SRT (10d), improved biomass degradation resulted in the highest soluble to total COD ratio and the highest VFA yield from the influent COD (0.14g VFA-COD/g TCOD). It was also observed that under the same SRT, VFA yields increased when the biomass concentration decreased. At a 10d SRT the VFA yield increased by 46%, when the biomass concentration decreased from 13g/L to 4.8g/L. Relatively high nutrient release was observed during fermentation. The average phosphorus release was 17.3mg PO(4)-P/g TCOD and nitrogen release was 25.8mg NH(4)-N/g TCOD.
实验室规模、室温、半连续式反应器被建立起来，以研究固体停留时间（SRT，等同于水力停留时间）和生物质浓度对源自增强型生物除磷工艺的剩余活性污泥（WAS）的非甲烷发酵生成挥发性脂肪酸（VFA）的影响。研究发现，VFA 的产率随 SRT 增加而增加。在最长的 SRT（10d）下，改善的生物质降解导致可溶 COD 与总 COD 的比例最高，且从进水 COD 中获得的 VFA 产率最高（0.14g VFA-COD/g TCOD）。还观察到，在相同的 SRT 下，当生物质浓度降低时，VFA 的产率会增加。在 10d 的 SRT 下，当生物质浓度从 13g/L 降低到 4.8g/L 时，VFA 的产率增加了 46%。在发酵过程中观察到相对较高的养分释放。平均磷释放为 17.3mg PO4-P/g TCOD，氮释放为 25.8mg NH4-N/g TCOD。
