Key Laboratory of Green Process and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
College of Chemical Engineering, University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049, China.
Bioprocess Biosyst Eng. 2020 Jun;43(6):1009-1015. doi: 10.1007/s00449-020-02298-5. Epub 2020 Jan 29.
Sulfide from anaerobic treatment of high-sulfate wastewater would always have some adverse effects on downstream processes. In this study, a coupling anaerobic/aerobic system was developed and operated under haloalkaliphilic condition to realize deep and high-efficiency removal of sulfate without production of sulfide. A haloalkaliphilic sulfur-oxidizing strain, Thioalkalivibrio versutus SOB306, was responsible for oxidation of sulfide. The anaerobic part was first operated at optimum condition based on a previous study. Then, its effluent with an average sulfide concentration of 674 ± 33 mg·l was further directly treated by a set of 1 l biofilter with SOB306 strain under aerobic condition. Finally, 100% removal rate of sulfide was achieved at aeration rate of 0.75 l·l·min, ORP of - 392 mV and HRT of 4 h. The average yield of elemental sulfur reached 79.1 ± 1.3% in the filter, and the CROS achieved a conversion rate of sulfate to sulfur beyond 54%. This study for the first time revealed the characteristics and performance of the haloalkaliphilic CROS in deep treatment of high-sulfate wastewater, which paved the way for the development and application of this method in the real world.
来自高硫酸盐废水的厌氧处理的硫化物总是会对下游工艺产生一些不利影响。在本研究中，开发了一种耦合厌氧/好氧系统，并在嗜盐-嗜碱条件下运行，以实现硫酸盐的深度和高效去除，而不产生硫化物。一种嗜盐-嗜碱硫氧化菌，Thioalkalivibrio versutus SOB306，负责氧化硫化物。根据先前的研究，首先在最佳条件下运行厌氧部分。然后，其流出物中平均硫化物浓度为 674 ± 33 mg·l，在有氧条件下，用一组 1 l 的生物过滤器直接处理，其中装有 SOB306 菌株。最终，在曝气率为 0.75 l·l·min、ORP 为-392 mV 和 HRT 为 4 h 的条件下，硫化物的去除率达到 100%。在过滤器中，单质硫的平均产率达到 79.1 ± 1.3%，CROS 的硫酸盐转化率超过 54%。本研究首次揭示了嗜盐-嗜碱 CROS 在高硫酸盐废水深度处理中的特性和性能，为该方法在实际中的开发和应用铺平了道路。
