Treatment of antibiotics in low C/N ratio dairy farm wastewater by anoxic-oxic system
YAN Guang1,2,, QIU Zhaofu1,2,,, CAO Guomin1,2, SUN Xianbo1,2, HUANG Xiaoxia1,2, BIAN Xiaotong1,2 1.School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China 2.State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China
Abstract:Antibiotics are often detected in dairy farm wastewater. The treatment effects of conventional pollutants and antibiotics in low C/N ratio dairy farm wastewater were investigated by using a bench-scale anoxic-oxic(A/O) system. When the COD, total nitrogen(TN), ammonia nitrogen and total phosphorus(TP) in the influent were 1 242~4 350, 830~1 367, 818~1 291 and 6~12 mg·L?1, respectively, and the hydraulic retention times (HRTs) of anoxic and oxic reactor were 3~4 and 2.1~5.4 d, respectively, COD and ammonia nitrogen in the effluent of the system were less than 400 mg·L?1 and 10 mg·L?1, respectively, TN removal rate was 40%~60% (without additional carbon source), and TP was almost not removed. By adjusting the recycle ratio of nitrified liquor (1.0∶1~1.3∶1), the self-sufficiency of alkalinity could be realized when the COD/TN ratio of influent water was not less than 3.1. Based on the analysis of 11 kinds of sulfonamide and 8 kinds of β-lactam antibiotics in the wastewater, 9 sulfonamides and one β-lactam antibiotic were detected in the system (the total concentration was 5.89~17.31 μg·L?1), and the total removal efficiency of them was more than 93%. Adding 8 kinds of sulfonamide antibiotics to the influent twice (firstly 50 μg·L?1 for each antibiotics and secondly 200 μg·L?1 for each antibiotics) did not affect the stability of the system, and the total removal efficiency of antibiotics was more than 90%, and the removal rates of antibiotics in anoxic reactor and oxic reactor were 15.02%~34.23% and 69.1%~91.43%, respectively. Reducing the HRT of oxic reactor to 50% did not affect the antibiotics removal rate by the system. Except trimethoprim, the other 7 kinds of sulfonamide antibiotics were mainly removed in oxic reactor, which was related to the S-N bond in their molecular structures. The above results have important reference value for dairy farm wastewater treatment and returning to farmland. Key words:dairy farm wastewater/ antibiotics/ A/O system/ alkalinity.
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1.School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China 2.State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China Received Date: 2019-09-29 Accepted Date: 2019-12-09 Available Online: 2020-07-10 Keywords:dairy farm wastewater/ antibiotics/ A/O system/ alkalinity Abstract:Antibiotics are often detected in dairy farm wastewater. The treatment effects of conventional pollutants and antibiotics in low C/N ratio dairy farm wastewater were investigated by using a bench-scale anoxic-oxic(A/O) system. When the COD, total nitrogen(TN), ammonia nitrogen and total phosphorus(TP) in the influent were 1 242~4 350, 830~1 367, 818~1 291 and 6~12 mg·L?1, respectively, and the hydraulic retention times (HRTs) of anoxic and oxic reactor were 3~4 and 2.1~5.4 d, respectively, COD and ammonia nitrogen in the effluent of the system were less than 400 mg·L?1 and 10 mg·L?1, respectively, TN removal rate was 40%~60% (without additional carbon source), and TP was almost not removed. By adjusting the recycle ratio of nitrified liquor (1.0∶1~1.3∶1), the self-sufficiency of alkalinity could be realized when the COD/TN ratio of influent water was not less than 3.1. Based on the analysis of 11 kinds of sulfonamide and 8 kinds of β-lactam antibiotics in the wastewater, 9 sulfonamides and one β-lactam antibiotic were detected in the system (the total concentration was 5.89~17.31 μg·L?1), and the total removal efficiency of them was more than 93%. Adding 8 kinds of sulfonamide antibiotics to the influent twice (firstly 50 μg·L?1 for each antibiotics and secondly 200 μg·L?1 for each antibiotics) did not affect the stability of the system, and the total removal efficiency of antibiotics was more than 90%, and the removal rates of antibiotics in anoxic reactor and oxic reactor were 15.02%~34.23% and 69.1%~91.43%, respectively. Reducing the HRT of oxic reactor to 50% did not affect the antibiotics removal rate by the system. Except trimethoprim, the other 7 kinds of sulfonamide antibiotics were mainly removed in oxic reactor, which was related to the S-N bond in their molecular structures. The above results have important reference value for dairy farm wastewater treatment and returning to farmland.
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