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Achieving simultaneous nitrogen and antibiotic removal in one-stage partial nitritation-Anammox (PN/A) process
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Highlights PN/A system could achieve simultaneous nitrogen and antibiotic removal. A strong correlation between amoA mRNA and SDZ removal efficiency was found. Compared to anammox bacteria, AOB contribute to antibiotic degradation through cometabolism. The antibacterial effect of SDZ was eliminated after degradation by PN/A system. The occurrence of ARGs (sul1 and sul2) may increase the environmental risk.
Abstract Partial nitritation-Anammox (PN/A) process has been recognized as a sustainable process for biological nitrogen removal. Although various antibiotics have been ubiquitously detected in influent of wastewater treatment plants, little is known whether functional microorganisms in the PN/A process are capable of biodegrading antibiotics. This study aimed to investigate simultaneous nitrogen and antibiotic removal in a lab-scale one-stage PN/A system treating synthetic wastewater containing a widely-used antibiotic, sulfadiazine (SDZ). Results showed that maximum total nitrogen (TN) removal efficiency of 86.1% and SDZ removal efficiency of 95.1% could be achieved when treating 5 mg/L SDZ under DO conditions of 0.5–0.6 mg/L. Compared to anammox bacteria, ammonia-oxidizing bacteria (AOB) made a major contribution to SDZ degradation through their cometabolic pathway. A strong correlation between amoA gene and SDZ removal efficiency was found (p < 0.01). In addition, the degradation products of SDZ did not exhibit any inhibitory effects on Escherichia coli. The findings suggest that it is promising to apply the PN/A process to simultaneously remove antibiotics and nitrogen from contaminated wastewater.
Achieving simultaneous nitrogen and antibiotic removal in one-stage partial nitritation-Anammox (PN/A) process
Graphical abstract Display Omitted
Highlights PN/A system could achieve simultaneous nitrogen and antibiotic removal. A strong correlation between amoA mRNA and SDZ removal efficiency was found. Compared to anammox bacteria, AOB contribute to antibiotic degradation through cometabolism. The antibacterial effect of SDZ was eliminated after degradation by PN/A system. The occurrence of ARGs (sul1 and sul2) may increase the environmental risk.
Abstract Partial nitritation-Anammox (PN/A) process has been recognized as a sustainable process for biological nitrogen removal. Although various antibiotics have been ubiquitously detected in influent of wastewater treatment plants, little is known whether functional microorganisms in the PN/A process are capable of biodegrading antibiotics. This study aimed to investigate simultaneous nitrogen and antibiotic removal in a lab-scale one-stage PN/A system treating synthetic wastewater containing a widely-used antibiotic, sulfadiazine (SDZ). Results showed that maximum total nitrogen (TN) removal efficiency of 86.1% and SDZ removal efficiency of 95.1% could be achieved when treating 5 mg/L SDZ under DO conditions of 0.5–0.6 mg/L. Compared to anammox bacteria, ammonia-oxidizing bacteria (AOB) made a major contribution to SDZ degradation through their cometabolic pathway. A strong correlation between amoA gene and SDZ removal efficiency was found (p < 0.01). In addition, the degradation products of SDZ did not exhibit any inhibitory effects on Escherichia coli. The findings suggest that it is promising to apply the PN/A process to simultaneously remove antibiotics and nitrogen from contaminated wastewater.
Achieving simultaneous nitrogen and antibiotic removal in one-stage partial nitritation-Anammox (PN/A) process
Li, Huayu (author) / Yao, Hong (author) / Liu, Tao (author) / Wang, Bingzheng (author) / Xia, Jun (author) / Guo, Jianhua (author)
2020-07-14
Article (Journal)
Electronic Resource
English
| American Chemical Society | 2024