Department of Environmental Engineering, Democritus University of Thrace, 67100, Xanthi, Greece.
Bioprocess Biosyst Eng. 2010 Feb;33(2):287-92. doi: 10.1007/s00449-009-0323-z. Epub 2009 May 6.
A two-stage lab-scale UASB reactor, incorporating a selector-type UASB prior to the main reactor was operated at 37 degrees C with an easily biodegradable food wastewater having a COD of 3,000 mg/L. Varying the hydraulic retention time from 25 to 5 h, the removal of COD by the two-stage process was higher than 95%. Effluent soluble COD was consistently below 75 mg/L and the methane production rate close to theoretical values. The selector UASB removed the majority of the organic load (70-90%) at high organic loading rate, i.e. between 6 and 30 g/(Ld) and the granular sludge developed was characterized by dense microbial colonies, high volatile suspended solids' content and high substrate degradation efficiency. Design of a two-stage process, incorporating a selector and a second UASB reactor, was able to achieve stable and complete substrate degradation at overall loading rates of the order of approximately 10-15 g/(Ld).
采用两段式实验室规模 UASB 反应器，在主反应器前采用选择器式 UASB，在 37°C 下处理易于生物降解的 COD 为 3000mg/L 的食品废水。通过将水力停留时间从 25 小时变化到 5 小时，两段式工艺对 COD 的去除率高于 95%。出水可溶性 COD 始终低于 75mg/L，甲烷生成率接近理论值。选择器 UASB 在高有机负荷率（即 6 至 30g/（Ld））下去除了大部分有机负荷（70-90%），并且所形成的颗粒污泥具有密集的微生物群落、高挥发性悬浮固体含量和高底物降解效率。两段式工艺（包括选择器和第二 UASB 反应器）的设计能够以约 10-15g/（Ld）的总负荷率实现稳定且完全的底物降解。
