Abstract
The biological degradation of nitrate and sulfate was investigated using a mixed microbial culture and lactate as the carbon source, with or without limited-oxygen fed. It was found that sulfate reduction was slightly inhibited by nitrate, since after nitrate depletion the sulfate reduction rate increased from 0.37 mg SO4 2−/mg VSS d to 0.71 mg SO4 2−/mg VSS d, and the maximum rate of sulfate reduction in the presence of nitrate corresponded to 56 % of the non-inhibited sulfate reduction rate determined after nitrate depleted. However, simultaneous but not sequential reduction of both oxy-anions was observed in this study, unlike some literature reports in which sulfate reduction starts only after depletion of nitrate, and this case might be due to the fact that lactate was always kept above the limiting conditions. At limited oxygen, the inhibited effect on sulfate reduction by nitrate was relieved, and the sulfate reduction rate seemed relatively higher than that obtained without limited-oxygen fed, whereas kept almost constant (0.86–0.89 mg SO4 2−/mg VSS d) cross the six ROS states. In contrast, nitrate reduction rates decreased substantially with the increase in the initial limited-oxygen fed, showing an inhibited effect on nitrate reduction by oxygen. Kinetic parameters determined for the mixed microbial culture showed that the maximum specific sulfate utilization rate obtained (0.098 ± 0.022 mg SO4 2−/(mg VSS h)) was similar to the reported typical value (0.1 mg SO4 2−/(mg VSS h)), also indicating a moderate inhibited effect by nitrate.
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Acknowledgments
This research was supported by the National High-tech R&D Program of China (863 Program, Grant No. 2011AA060904), the National Natural Science Foundation of China (Grant Nos. 51176037 and 51308147), Project 51121062 (National Creative Research Groups), the State Key Laboratory of Urban Water Resource and Environment (2012DX06), and the Academician Workstation Construction in Guangdong Province (2012B090500018).
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Xu, Xj., Chen, C., Wang, Aj. et al. Kinetics of nitrate and sulfate removal using a mixed microbial culture with or without limited-oxygen fed. Appl Microbiol Biotechnol 98, 6115–6124 (2014). https://doi.org/10.1007/s00253-014-5642-6
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DOI: https://doi.org/10.1007/s00253-014-5642-6