Anaerobic migrating blanket reactor treatment of low-strength wastewater at low temperatures
Anaerobic migrating blanket reactor treatment of low-strength wastewater at low temperatures
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DOI：
10.2175/106143001x139632
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发表时间：
2001-09-01
影响因子：
3.1
通讯作者：
Sung, SW
中科院分区：
文献类型：
--
作者：
Angenent, LT;Banik, GC;Sung, SW
研究了分区厌氧迁移毯式反应器（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，在低温（15℃和20℃）条件下，用脱脂干乳基质作为合成废水饲喂20 l的AMBR。进水浓度恒定，化学需氧量（COD）为600 mg/L， 5 d生物需氧量（BODS）为285 mg/L。在4小时水力停留时间（HRT）下，运行周期（15℃）结束时，可溶性COD （SCOD）去除率为73%，总COD （TCOD）去除率为59%。在4小时HRT中，分阶段条件促进了反应器最后隔间中丙酸的完全去除。颗粒的比产甲烷活性缓慢上升，直到操作时间结束，提高了去除率。生物质得到了有效的保留，即使在反应器HRT从12小时逐步降低到4小时的过程中，固体保留时间（SRT）也始终大于50天。在流量变化时，较长的SRT也促进了系统的稳定性，SCOD去除效率保持在70%以上。在水力压力测试期间，HRT从4小时减少到1小时，持续1天（24 HRT），其中出水中的挥发性悬浮固体（VSS）从平均背景水平8.7 g/d增加到35 g/d， SRT从50.5天减少到12.6天。然而，混合液挥发性悬浮物浓度仅下降1 g/L，因此水力应力后1天（与水力应力前1天）的COD去除效率和沼气产量相似。
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 degreesC). The concentration of the influent was constant at chemical oxygen demand (COD) and 5-day biological oxygen demand (BODS) concentrations of 600 and 285 mg/L, respectively. The soluble COD (SCOD) removal efficiency was 73% at the end of the operating period (15 degreesC) 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 staying 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).