Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 5, Issue 8, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.180795
Keywords
azo dye; decolorization; biological nitrogen removal; sequencing batch reactor
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Funding
- Innovation Fund of Industry-University-Research Cooperation of Jiangsu, China [BY2016065-31]
- program of Jiangsu Government Scholarship for Overseas Studies [JS-2016-206]
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The potential disrupting effects of Azo dye on wastewater nutrients removal deserved more analysis. In this study, 15 days exposure experiments were conducted with alizarin yellow R (AYR) as a model dye to determine whether the dye caused adverse effects on biological removal of both the dye and nutrients in acclimated anaerobic-aerobic-anoxic sequencing batch reactors. The results showed that the AYR removal efficiency was, respectively, 85.7% and 66.8% at AYR concentrations of 50 and 200 mg l(-1), while higher AYR inlet (400 mg l(-1)) might inactivate sludge. Lower removal of AYR at 200 mg l(-1) of AYR was due to the insufficient support of electron donors in the anaerobic process. However, the decolorized by-products p-phenylenediamine and 5-aminosalicylic were completely decomposed in the following aerobic stage at both 50 and 200 mg l(-1) of AYR concentrations. Compared with the absence of AYR, the presence of 200mg l(-1) of AYR decreased the total nitrogen removal efficiency from 82.4 to 41.1%, and chemical oxygen demand (COD) removal efficiency initially decreased to 68.1% and then returned to around 83.4% in the long-term exposure time. It was also found that the inhibition of AYR, nitrogen and COD removal induced by a higher concentration of AYR was due to the increased intracellular reactive oxygen species production, which caused the rise of oxidation-reduction potential value and decreased ammonia monooxygenase and nitrite oxidoreductase activities.
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