Department of Civil Engineering, College of Engineering, Qassim University, P.O. Box 6677, 51452 Burayadah, Kingdom of Saudi Arabia.
Water Sci Technol. 2011;64(3):610-7. doi: 10.2166/wst.2011.616.
The treatment of grey water in two upflow anaerobic sludge blanket (UASB) reactors, operated at different hydraulic retention times (HRTs) and temperatures, was investigated. The first reactor (UASB-A) was operated at ambient temperature (14-25 degrees C) and HRT of 20, 12 and 8 h, while the second reactor (UASB-30) was operated at controlled temperature of 30 degrees C and HRT of 16, 10 and 6 h. The two reactors were fed with grey water from 'Flintenbreite' settlement in Luebeck, Germany. When the grey water was treated in the UASB reactor at 30 degrees C, total chemical oxygen demand (CODt) removal of 52-64% was achieved at HRT between 6 and 16 h, while at lower temperature lower removal (31-41%) was obtained at HRT between 8 and 20 h. Total nitrogen and phosphorous removal in the UASB reactors were limited (22-36 and 10-24%, respectively) at all operational conditions. The results showed that at increasing temperature or decreasing HRT of the reactors, maximum specific methanogenic activity of the sludge in the reactors improved. As the UASB reactor showed a significantly higher COD removal (31-64%) than the septic tank (11-14%) even at low temperature, it is recommended to use UASB reactor instead of septic tank (the most common system) for grey water pre-treatment. Based on the achieved results and due to high peak flow factor, a HRT between 8 and 12 h can be considered the suitable HRT for the UASB reactor treating grey water at temperature 20-30 degrees C, while a HRT of 12-24 h can be applied at temperature lower than 20 degrees C.
采用两种上流式厌氧污泥床（UASB）反应器，在不同水力停留时间（HRT）和温度下处理灰水。第一个反应器（UASB-A）在环境温度（14-25°C）和 HRT 为 20、12 和 8 h 下运行，而第二个反应器（UASB-30）在控制温度为 30°C 和 HRT 为 16、10 和 6 h 下运行。两个反应器均以德国吕贝克的“Flintenbreite”污水处理厂的灰水为进水。当灰水在 30°C 的 UASB 反应器中处理时，HRT 在 6 至 16 h 之间可实现总化学需氧量（CODt）去除率为 52-64%，而在较低温度下（HRT 在 8 至 20 h 之间）则获得较低的去除率（31-41%）。在所有运行条件下，UASB 反应器中的总氮和磷去除均受到限制（分别为 22-36%和 10-24%）。结果表明，随着温度升高或 HRT 降低，反应器中污泥的最大比甲烷生成活性提高。由于 UASB 反应器的 COD 去除率（31-64%）明显高于化粪池（11-14%），即使在低温下也是如此，因此建议使用 UASB 反应器代替化粪池（最常见的系统）进行灰水预处理。根据所取得的结果，并且由于高峰流量系数较高，在 20-30°C 温度下，可将 8-12 h 的 HRT 视为 UASB 反应器处理灰水的合适 HRT，而在温度低于 20°C 时可采用 12-24 h 的 HRT。
