Osuna M B, Iza J, Zandvoort M, Lens P N L
Sub-department of Environmental Technology, Agricultural University of Wageningen, NL-8700-EV Wageningen, The Netherlands.
Water Sci Technol. 2003;48(6):1-8.
The effect of the absence of trace elements on the conversion of a mixture of volatile fatty acids by a distillery anaerobic granular sludge was investigated. Two UASB reactors were operated under identical operational conditions except for the influent trace metal concentrations, during 140 days. Experiments were carried out in three periods, where different organic loading rates (OLR) were applied to the reactors. The total trace metal concentration steadily decreased at a rate of 48 microg metal/g TS.d in the deprived reactor (down to 35% of their initial value). In contrast, trace metals accumulated in granules present in the control reactor. At the end of the experiment, the COD removal efficiencies were 99% and 77% for the control and deprived reactors, respectively, due to the lack of propionate conversion. Cobalt sorption experiments were carried out in order to study its speciation, and its effects on the speciation of other metals as well. A paper mill wastewater treating granular sludge was also included in the study as a comparison. Results obtained showed that the principal metal forms normally associated with any sludge are a function of each soluble metal concentration in the system, and the characteristics of the particular sludge.
研究了微量元素缺失对酒厂厌氧颗粒污泥转化挥发性脂肪酸混合物的影响。在140天内，两个上流式厌氧污泥床（UASB）反应器在相同运行条件下运行，只是进水痕量金属浓度不同。实验分三个阶段进行，对反应器施加不同的有机负荷率（OLR）。在缺乏微量元素的反应器中，总痕量金属浓度以48微克金属/克总固体·天的速率稳步下降（降至其初始值的35%）。相比之下，痕量金属在对照反应器中的颗粒中积累。实验结束时，由于缺乏丙酸盐转化，对照反应器和缺乏微量元素的反应器的化学需氧量（COD）去除效率分别为99%和77%。进行了钴吸附实验，以研究其形态以及对其他金属形态的影响。作为对比，研究中还纳入了处理造纸厂废水的颗粒污泥。所得结果表明，通常与任何污泥相关的主要金属形态是系统中每种可溶性金属浓度以及特定污泥特性的函数。
