UNESCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA, Delft, The Netherlands.
Facultad de Ciencias Químicas, Universidad Veracruzana, 94340, Orizaba, VER, Mexico.
Environ Sci Pollut Res Int. 2018 Feb;25(6):5115-5128. doi: 10.1007/s11356-017-9334-5. Epub 2017 Jul 12.
Industrial wastewaters containing high concentrations of sulphate, such as those generated by mining, metallurgical and mineral processing industries, require electron donor for biological sulfidogenesis. In this study, five types of lignocellulosic biowastes were characterized as potential low-cost slow release electron donors for application in a continuously operated sulphidogenic inverse fluidized bed bioreactor (IFBB). Among them, natural scourer and cork were selected due to their high composition of volatile solids (VS), viz. 89.1 and 96.3%, respectively. Experiments were performed in batch (47 days) and in an IFBB (49 days) using synthetic sulphate-rich wastewater. In batch, the scourer gave higher sulphate reduction rates (67.7 mg SO L day) in comparison to cork (12.1 mg SO L day), achieving >82% sulphate reduction efficiencies. In the IFBB packed with the natural scourer, the average sulphate reduction efficiency was 24 (±17)%, while the volumetric sulphate reduction rate was 167 (±117) mg SO L day. The long incubation time in the batch experiments (47 days) allowed higher sulphate reduction efficiencies in comparison to the short hydraulic retention time (24 h) in the IFBB. This suggests the hydrolysis-fermentation was the rate-limiting step and the electron donor supply (through hydrolysis of the lignocellulosic biowaste) was limiting the sulphate reduction. Lignocellulose as carrier material and slow release electron donor for sulphidogenesis.
含有高浓度硫酸盐的工业废水，如采矿、冶金和矿物加工行业产生的废水，需要电子供体进行生物硫化。在这项研究中，五种木质纤维素生物废物被表征为潜在的低成本缓慢释放电子供体，可应用于连续操作的硫化反向流化床生物反应器（IFBB）中。其中，由于天然 scourer 和 cork 的挥发性固体（VS）含量较高，分别为 89.1%和 96.3%，因此被选中。实验分别在批处理（47 天）和 IFBB（49 天）中使用合成富硫酸盐废水进行。在批处理中，与 cork（12.1mgSO L day）相比，scourer 的硫酸盐还原速率更高（67.7mgSO L day），达到了 >82%的硫酸盐还原效率。在填充天然 scourer 的 IFBB 中，平均硫酸盐还原效率为 24（±17）%，而体积硫酸盐还原速率为 167（±117）mgSO L day。在批处理实验中较长的孵育时间（47 天）与 IFBB 中较短的水力停留时间（24 小时）相比，硫酸盐还原效率更高。这表明水解-发酵是限速步骤，而电子供体供应（通过木质纤维素生物废物的水解）限制了硫酸盐的还原。木质纤维素作为载体材料和硫化的缓慢释放电子供体。
