Angenent L T, Banik G C, Sung S
Department of Civil and Construction Engineering at Iowa State University, USA.
Water Environ Res. 2001 Sep-Oct;73(5):567-74. doi: 10.2175/106143001x139632.
The feasibility of the compartmentalized anaerobic migrating blanket reactor (AMBR) was studied for the treatment of low-strength soluble wastewater under low-temperature conditions. During an operating period of 186 days, a 20-L AMBR was fed nonfat dry milk substrate as a synthetic wastewater at low temperatures (15 and 20 degrees C). The concentration of the influent was constant at chemical oxygen demand (COD) and 5-day biological oxygen demand (BOD5) concentrations of 600 and 285 mg/L, respectively. The soluble COD (SCOD) removal efficiency was 73% at the end of the operating period (15 degrees C) at a 4-hour hydraulic retention time (HRT), while the total COD (TCOD) removal efficiency was 59%. At a 4-hour HRT, staged conditions promoted complete removal of propionic acid in the final compartments of the reactor. The specific methanogenic activity of granules increased slowly until the end of the operating time, improving the removal rate. Biomass was retained effectively, as evidenced by the solids retention time (SRT) that was always greater than 50 days even during step decreases of the reactor HRT from 12 hours to 4 hours. A long SRT also promoted system stability during changes in flow, which was observed by SCOD removal efficiencies staving greater than 70%. During a hydraulic stress test, the HRT was reduced from 4 hours to 1 hour for one day (24 HRTs) in which volatile suspended solids (VSS) in the effluent increased from an average background level of 8.7 g/d to 35 g/d and the SRT decreased from 50.5 days to 12.6 days. However, mixed liquor volatile suspended solids concentration decreased only by 1 g/L, and hence a similar COD removal efficiency and biogas production was found one day after the hydraulic stress (as compared to one day before the hydraulic stress).
研究了分隔式厌氧移动床生物膜反应器（AMBR）在低温条件下处理低强度可溶性废水的可行性。在186天的运行期内，一个20升的AMBR在低温（15和20摄氏度）下以脱脂奶粉底物作为合成废水进料。进水浓度恒定，化学需氧量（COD）和五日生化需氧量（BOD5）浓度分别为600和285毫克/升。在4小时水力停留时间（HRT）下，运行期结束时（15摄氏度）可溶性COD（SCOD）去除效率为73%，而总COD（TCOD）去除效率为59%。在4小时HRT下，分段条件促进了反应器最后隔室中丙酸的完全去除。颗粒的比产甲烷活性缓慢增加直至运行时间结束，提高了去除率。生物量得到有效保留，固体停留时间（SRT）始终大于50天，即使在反应器HRT从12小时逐步降至4小时期间也是如此。长SRT还促进了流量变化期间的系统稳定性，SCOD去除效率保持大于70%可证明这一点。在水力应力测试中，HRT在一天内从4小时降至1小时（24个HRT），在此期间，出水挥发性悬浮固体（VSS）从平均背景水平8.7克/天增加到35克/天，SRT从50.5天降至12.6天。然而，混合液挥发性悬浮固体浓度仅下降1克/升，因此在水力应力一天后（与水力应力前一天相比）发现了类似的COD去除效率和沼气产量。
