Treatment of strong domestic sewage in a 96 m3 UASB reactor operated at ambient temperatures: two-stage versus single-stage reactor.
Treatment of strong domestic sewage in a 96 m3 UASB reactor operated at ambient temperatures: two-stage versus single-stage reactor.
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在环境温度下运行的 96 m3 UASB 反应器中处理浓生活污水：两级反应器与单级反应器。
DOI：
10.1016/j.biortech.2004.06.014
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发表时间：
2005
影响因子：
11.4
通讯作者：
G. Lettinga
中科院分区：
文献类型：
--
作者：
M. Halalsheh;Z. Sawajneh;M. Zu'bi;G. Zeeman;J. Lier;M. Fayyad;G. Lettinga
采用96 m3的UASB反应器在不同条件下运行2.5年，以评估在冬季平均温度为18 ° C、夏季平均温度为25 ° C的环境温度下处理高浓度污水（CODtot = 1531 mg/l）的可行性。在第一年期间，反应器作为两级系统运行，第一级的OLR为3.6 - 5.0 kg COD/m3 d，第二级为2.9 - 4.6 kg COD/m3 d。第一阶段的试验结果表明，COD_（tot）和COD_（ss）的平均去除率分别为51%和60%，温度的影响不明显。第二阶段反应堆不稳定。温度影响污泥的稳定性。在第二年，第一阶段作为一个单级UASB反应器在以前的负荷率的一半。结果表明，夏季COD_（tot）平均去除率为62%，冬季COD_（tot）平均去除率为51%。然而，出水悬浮固体稳定与VSS/TSS的比例在0.50左右的所有一年。单级反应器中的污泥稳定性好，具有良好的沉降性能。在最后三个月的研究中，污泥定期从单级UASB反应器中排出。结果表明，在CODtot方面的性能没有显著改善。根据实验结果，在约旦条件下，单级UASB反应器在相对长的HRT下操作优于两级系统。
A 96 m3UASB reactor was operated for 2.5 years under different conditions to assess the feasibility of treating strong sewage (CODtot=1531 mg/l) at ambient temperatures with averages of 18 and 25 °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/m3d for the first stage and 2.9–4.6 kg COD/m3d for the second stage. The results of the first stage showed average removals of 51% and 60% for CODtotand CODssrespectively 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 CODtotduring 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 CODtot. 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.