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Article

Nitrate Removal from Actual Wastewater by Coupling Sulfur-Based Autotrophic and Heterotrophic Denitrification under Different Influent Concentrations

by 1,2,†, 1,*,†, 1, 1, 1 and 3
1
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
2
National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Suzhou 215009, China
3
Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Jesus Gonzalez-Lopez, Lingzhan Miao and Jun Hou
Water 2021, 13(20), 2913; https://doi.org/10.3390/w13202913
Received: 14 September 2021 / Revised: 9 October 2021 / Accepted: 12 October 2021 / Published: 16 October 2021
Contamination of wastewater with organic-limited nitrates has become an urgent problem in wastewater treatment. The cooperating heterotrophic with sulfur autotrophic denitrification is an alternative process and the efficiency has been assessed in many studies treating simulated wastewater under different operating conditions. However, due to the complex and diverse nature of actual wastewater, more studies treating actual wastewater are still needed to evaluate the feasibility of collaborative denitrification. In this study, lab-scale experiments were performed with actual nitrate polluted water of two different concentrations, with glucose and sodium thiosulfate introduced as mixed electron donors in the coupling sulfur-based autotrophic and heterotrophic denitrification. Results showed that the optimum denitrification performance was exhibited when the influent substrate mass ratio of C/N/S was 1.3/1/1.9, with a maximum denitrification rate of 3.52 kg NO3-N/(m3 day) and nitrate removal efficiency of 93% in the coupled systems. Illumina high-throughput sequencing analysis revealed that autotrophic, facultative, and heterotrophic bacteria jointly contributed to high nitrogen removal efficiency. The autotrophic denitrification maintained as the predominant process, while the second most prevalent denitrification process gradually changed from heterotrophic to facultative with the increase of influent concentration at optimum C/N/S ratio conditions. Furthermore, the initiation of dissimilatory nitrate reduction to ammonium (DNRA) was very pivotal in promoting the entire denitrification process. These results suggested that sulfur-based autotrophic coupled with heterotrophic denitrifying process is an alternative and promising method to treat nitrate containing wastewater. View Full-Text
Keywords: actual nitrate wastewater; sulfur autotrophic denitrification; coupled denitrification; removal performance; microbial community actual nitrate wastewater; sulfur autotrophic denitrification; coupled denitrification; removal performance; microbial community
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MDPI and ACS Style

Liu, F.; Wang, S.; Zhang, X.; Qian, F.; Wang, Y.; Yin, Y. Nitrate Removal from Actual Wastewater by Coupling Sulfur-Based Autotrophic and Heterotrophic Denitrification under Different Influent Concentrations. Water 2021, 13, 2913. https://doi.org/10.3390/w13202913

AMA Style

Liu F, Wang S, Zhang X, Qian F, Wang Y, Yin Y. Nitrate Removal from Actual Wastewater by Coupling Sulfur-Based Autotrophic and Heterotrophic Denitrification under Different Influent Concentrations. Water. 2021; 13(20):2913. https://doi.org/10.3390/w13202913

Chicago/Turabian Style

Liu, Feng, Suqin Wang, Xuezhi Zhang, Feiyue Qian, Yaobing Wang, and Yao Yin. 2021. "Nitrate Removal from Actual Wastewater by Coupling Sulfur-Based Autotrophic and Heterotrophic Denitrification under Different Influent Concentrations" Water 13, no. 20: 2913. https://doi.org/10.3390/w13202913

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