Koster I W, Lettinga G
Wageningen Agricultural University, Department of Water Pollution Control, De Dreijen 12, 6703 BC Wageningen, The Netherlands.
Biotechnol Bioeng. 1985 Oct;27(10):1411-7. doi: 10.1002/bit.260271004.
The feasibility of the upflow anaerobic sludge bed (UASB) process for the treatment of potato starch wastewater at low ambient temperatures was demonstrated by operating two 5.65-L reactors at 14 degrees C and 20 degrees C, respectively. The organic space loading rates achieved in these laboratory-scale reactors were 3 kg COD/m(3)/day at 14 degrees C and 4-5 kg COD/m(3)/day at 20 degrees C. The corresponding sludge loading rates were 0.12 kg COD/kg VSS/day at 14 degrees C and 0.16-0.18 kg COD/kg VSS/day at 20 degrees C.These findings are of considerable practical importance because application of anaerobic treatment at low ambient temperatures will lead to considerable savings in energy needed for operating the process. As compared with various other anaerobic wastewater treatment processes, a granular sludge upflow process represents one of the best options developed so far. Although the overall sludge yield under psychrophilic conditions is slightly higher than under optimal mesophilic conditions, this doesn't seriously hamper the operation of the process. The extra sludge yield, due to accumulation of slowly hydrolyzing substrate ingredients, was 4.75% of the COD input at 14 degrees C and 1.22% of the COD input at 20 degrees C.
通过分别在14℃和20℃下运行两个5.65升的反应器，证明了上流式厌氧污泥床（UASB）工艺在低温环境下处理马铃薯淀粉废水的可行性。在这些实验室规模的反应器中，14℃时实现的有机容积负荷率为3千克化学需氧量/立方米/天，20℃时为4 - 5千克化学需氧量/立方米/天。相应的污泥负荷率在14℃时为0.12千克化学需氧量/千克挥发性悬浮固体/天，20℃时为0.16 - 0.18千克化学需氧量/千克挥发性悬浮固体/天。这些发现具有相当重要的实际意义，因为在低温环境下应用厌氧处理将大幅节省该工艺运行所需的能源。与其他各种厌氧废水处理工艺相比，颗粒污泥上流式工艺是目前已开发出的最佳选择之一。尽管嗜冷条件下的总污泥产量略高于最佳嗜温条件下的产量，但这并未严重妨碍该工艺的运行。由于缓慢水解的底物成分积累导致的额外污泥产量，在14℃时为化学需氧量输入的4.75%，在20℃时为化学需氧量输入的1.22%。
