UASB reactor for domestic wastewater treatment at low temperatures: a comparison between a classical UASB and hybrid UASB-filter reactor
UASB reactor for domestic wastewater treatment at low temperatures: a comparison between a classical UASB and hybrid UASB-filter reactor
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DOI：
10.2166/wst.2004.0865
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发表时间：
2004-01-01
影响因子：
2.7
通讯作者：
Green, M
中科院分区：
文献类型：
--
作者：
Lew, B;Tarre, S;Green, M
研究了上流式厌氧污泥床（UASB）反应器和UASB-滤池复合反应器在不同运行温度（28、20、14和10 ℃）和负荷条件下处理生活污水的性能。对于研究的每个温度，观察到恒定的CODt去除，只要上流速度低于0.35米/小时。在这些上升流速下，在28 ℃和20 ℃下观察到两种反应器类型的相似去除率，分别为82%和72%。然而，在14和10 ℃下，UASB反应器表现出更好的COD去除率（分别为70%和48%）比混合反应器（60%和38%）。在28 degreesC下，在两个反应器中观察到恒定的200 g污泥质量，并且COD去除仅归因于生物降解。在较低的温度下，除了生物降解外，还观察到固体积累，反应器污泥随着温度的降低而增加。在较低温度下生物降解的减少被固体积累所抵消，并解释了在28 ℃、20 ℃和14 ℃下观察到的相似的总体COD去除效率。温度降低后，两个反应器中的流出物TSS浓度也随之增加。在14 ℃和10 ℃下，UASB反应器出水TSS浓度较低，运行效果较好。
The performance of an upflow anaerobic sludge blanket (UASB) reactor and a hybrid UASB-filter reactor was investigated and compared for the treatment of domestic wastewater at different operational temperatures (28, 20, 14 and 10degreesC) and loading rates. For each temperature studied a constant CODt removal was observed as long as the upflow velocity was lower than 0.35 m/h. At these upflow velocities similar removals were observed for both reactor types at 28 and 20degreesC, 82 and 72% respectively. However, at 14 and 10degreesC the UASB reactor showed a better COD removal (70% and 48%, respectively) than the hybrid reactor (60% and 38%).COD removal resulted from biological degradation and solids accumulation in the reactors. At 28degreesC, a constant 200 g sludge mass was observed in both reactors and COD removal was attributed to biological degradation only. At lower temperatures, solids accumulation was observed in addition to biological degradation with an increase in reactor sludge as the temperature decreased. The decrease in biological degradation at lower temperatures was offset by solids accumulation and explains the similar overall COD removal efficiency observed at 28degreesC, 20degreesC and 14degreesC. The decrease in temperature was also followed by an increase in the effluent TSS concentration in both reactors. At 14 and 10degreesC a lower effluent TSS concentration and better performance was observed in the UASB reactor.