Rajinikanth R, Ramirez I, Steyer J P, Mehrotra I, Kumar P, Escudie R, Torrijos M
UR50, Laboratoire de Biotechnologie de l'Environnement, Institut National de la Recherche Agronomique, Avenue des Etangs, Narbonne, France.
Water Sci Technol. 2008;58(1):109-17. doi: 10.2166/wst.2008.342.
A 9.8-L hybrid UASFB reactor, in which the lower half was occupied by a sludge blanket and the upper half by small floating polyethylene media, was evaluated using wine distillery vinasse as substrate. The reactor was operated for a total period of 232 days at 33 + 1 degrees C. Continuous feeding of the reactor was started with an initial OLR of 2.9 g COD/L.d and then it was increased step wise to 19.5 g COD/L.d by increasing the feed COD, while maintaining a constant HRT (1.05 d). The reactor was equipped with a continuous internal recirculation system from top to the bottom at the rate of 9 L/h (upflow velocity = 0.83 m/h) upto day 159 and then it was reduced to about half on day 160 onwards. It was observed that the reduced recirculation rate did not affect the performance of the reactor with an average COD(t) and COD(s) removal efficiencies of 82 and 88%, respectively. A maximum gas production rate of 6.7 L CH(4)/L(reactor).d was achieved for the highest OLR applied. The specific activity analysis depicts that the activity of the attached biomass was more than 2 times higher than that of the granular sludge. The efficiency of liquid mixing was good through out this study. The packing medium had a dual role in the retention of the biomass inside the reactor: i.e. entrapment of biomass within the support and filtration of the granular biomass, preventing it from going out of the reactor. ADM1_10 model simulated well the dynamic evolutions of the main variables in the liquid as well as in the gas phases.
使用葡萄酒蒸馏酒糟作为底物，对一个9.8升的混合上流式厌氧污泥床（UASFB）反应器进行了评估，该反应器下半部分为污泥层，上半部分为小型浮动聚乙烯介质。该反应器在33±1℃下总共运行了232天。反应器连续进料，初始有机负荷率（OLR）为2.9克化学需氧量（COD）/升·天，然后通过增加进料COD逐步提高到19.5克COD/升·天，同时保持恒定的水力停留时间（HRT，1.05天）。在第159天之前，反应器配备了从顶部到底部的连续内部循环系统，循环速率为9升/小时（上流速度=0.83米/小时），然后在第160天及之后降低到约一半。观察到循环速率降低并不影响反应器的性能，平均总COD（t）和溶解性COD（s）去除效率分别为82%和88%。对于所应用的最高OLR，实现了最大产气率为6.7升甲烷/升（反应器）·天。比活性分析表明，附着生物量的活性比颗粒污泥的活性高2倍以上。在整个研究过程中，液体混合效率良好。填料介质在将生物量保留在反应器内方面具有双重作用：即在载体内部截留生物量以及过滤颗粒生物量，防止其流出反应器。ADM1_10模型很好地模拟了液相和气相中主要变量的动态演变。
