Halalsheh M, Sawajneh Z, Zu'bi M, Zeeman G, Lier J, Fayyad M, Lettinga G
Water and Environmental Study and Research Center, University of Jordan, Amman, Jordan.
Bioresour Technol. 2005 Mar;96(5):577-85. doi: 10.1016/j.biortech.2004.06.014.
A 96 m3 UASB reactor was operated for 2.5 years under different conditions to assess the feasibility of treating strong sewage (COD(tot) = 1531 mg/l) at ambient temperatures with averages of 18 and 25 degrees C for winter and summer respectively. During the first year, the reactor was operated as a two-stage system at OLRs in the range of 3.6-5.0 kg COD/m3 d for the first stage and 2.9-4.6 kg COD/m3 d for the second stage. The results of the first stage showed average removals of 51% and 60% for COD(tot) and COD(ss) respectively without significant effect of temperature. The second stage reactor was unstable. The temperature affected sludge stabilization. During the second year, the first stage was operated as a single-stage UASB reactor at half of the previous loading rates. The results showed an average removal efficiency of 62% for COD(tot) during summer, while it dropped to 51% during wintertime. However, the effluent suspended solids were stabilized with VSS/TSS ratio around 0.50 all over the year. The sludge in the single-stage reactor was well-stabilized and exerted an excellent settlability. During the last three months of research, sludge was discharged regularly from the single-stage UASB reactor. The results showed no significant improvement in the performance in terms of COD(tot). Based on the results of the experiment, a single-stage UASB reactor operated at relatively long HRT is preferred above two-stage system at the Jordanian conditions.
一个96立方米的上流式厌氧污泥床（UASB）反应器在不同条件下运行了2.5年，以评估在环境温度下处理强污水（化学需氧量（总）=1531毫克/升）的可行性，冬季和夏季的平均温度分别为18摄氏度和25摄氏度。在第一年，该反应器作为两级系统运行，第一级的有机负荷率（OLR）在3.6-5.0千克化学需氧量/立方米·天范围内，第二级为2.9-4.6千克化学需氧量/立方米·天。第一阶段的结果表明，化学需氧量（总）和化学需氧量（悬浮固体）的平均去除率分别为51%和60%，温度影响不显著。第二阶段反应器不稳定。温度影响污泥的稳定化。在第二年，第一阶段作为单级UASB反应器运行，负荷率为之前的一半。结果表明，夏季化学需氧量（总）的平均去除效率为62%，而冬季降至51%。然而，全年出水悬浮固体稳定，挥发性悬浮固体/总悬浮固体（VSS/TSS）比率约为0.50。单级反应器中的污泥得到了很好的稳定，沉降性能优异。在研究的最后三个月，从单级UASB反应器定期排放污泥。结果表明，在化学需氧量（总）方面性能没有显著改善。基于实验结果，在约旦的条件下，与两级系统相比，在相对较长的水力停留时间（HRT）下运行的单级UASB反应器更受青睐。
