Enhancement of azo dye anaerobic bio-treatment performance with ferroferric oxide supplement
Enhancement of azo dye anaerobic bio-treatment performance with ferroferric oxide supplement
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DOI：
10.1016/j.jece.2022.108350
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发表时间：
2022-07
影响因子：
7.7
通讯作者：
T. H. Nguyen;T. Watari;T. Vo;M. Hatamoto;T. Setiadi;Takashi Yamaguchi
中科院分区：
文献类型：
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作者：
T. H. Nguyen;T. Watari;T. Vo;M. Hatamoto;T. Setiadi;Takashi Yamaguchi
以淀粉和活性黑为碳源，采用Fe 3 O 4作为碳源，对含偶氮染料活性黑的合成废水进行处理。通过批式实验确定了10 g. L-1的Fe 3 O 4对该废水的最佳处理效果。因此，该浓度被选择用于后续实验与10 L厌氧折流板反应器（ABR）的连续系统。ABR反应器在30 ℃、水力停留时间18.6 h、运行170 d。从第105天开始，在ABR各隔室中加入Fe 3 O 4 10 g. L-1。Fe 3 O 4的补充显着提高ABR的处理性能。当进水色度为1300 Pt-Co，COD为305 mgCOD·L-1时，它们的去除率分别从无Fe 3 O 4相的44%和42%提高到添加Fe 3 O 4相的85%和76%。有趣的是，所产生的甲烷去除COD的比例在Fe 3 O 4参与相低于在Fe 3 O 4-自由相，这表明在富铁条件下的ABR的脱色产甲烷的偏好。微生物群落分析表明，Fe 3 O 4可能通过选择性富集关键底物发酵菌和染料降解菌，特别是梭菌，对染料降解过程起到了重要作用。
In this study, ferroferric oxide (Fe3O4) was used to accelerate treatment performance of synthetic wastewater containing azo dye reactive black and starch as a sole carbon source. In a batch experiment, 10 g·L-1of Fe3O4was confirmed to be optimal to this type of wastewater treatment. Therefore, this concentration was chosen for the follow-up experiment with a continuous system of 10 L anaerobic baffled reactor (ABR). The ABR was run at 30 ℃ with a hydraulic retention time of 18.6 h for 170 days. Fe3O4was added to each ABR compartment at 10 g·L-1from day 105. The Fe3O4supplement significantly enhanced ABR treatment performance. With influent color and chemical oxygen demand (COD) levels of 1300 Pt-Co and 305 mgCOD·L-1, their removal efficiencies increased remarkably from 44% and 42% in the Fe3O4-free phase to 85% and 76% in the Fe3O4-added phase, respectively. Interestingly, the ratio of generated methane on removed COD in Fe3O4-involved phases were lower than that in Fe3O4-free phase, suggesting a preference of the ABR for decolorization over methanogenesis in an iron-rich condition. Microbial community analysis revealed that Fe3O4may have immensely contributed to dyeing degradation process through the selective enrichment of key substrate-fermenting and dye-degrading bacteria, especiallyClostridiumspp.