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Article

Treatment of Organic Matter and Tetracycline in Water by Using Constructed Wetlands and Photocatalysis

1
Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
2
Faculty of Chemistry, The University of Danang—University of Science and Education, Le Duan Road, Danang 550000, Vietnam
3
Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
4
Emerging Compounds Research Center (ECOREC), National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(13), 2680; https://doi.org/10.3390/app9132680
Received: 31 May 2019 / Revised: 26 June 2019 / Accepted: 27 June 2019 / Published: 30 June 2019
In this study, the ability of a bench-scale simulated constructed wetland (CW) to remove organic matter (OM) and tetracycline (TC) from water was examined. The performance of CW was evaluated by varying the initial concentrations of the target compounds and the hydraulic retention times (HRTs). Findings showed that OM removal efficiencies were 55.2–80.8%, 28.1–71.9% and 72.1–79.7% for ultraviolet absorbance at 254 nm (UV-254), dissolved organic carbon (DOC) and soluble chemical oxygen demand (sCOD) respectively, under 1 day-HRT, whereas higher initial DOC concentration achieved better removal efficiencies. Changing from 1 day-HRT to 2 day-HRT, the removal efficiency of OMs remained practically unchanged, while that of NH3-N increased considerably, from 61.7% to 73.0%, implying that the removal of ammonia in CW needs a longer time for complete treatment. CW also showed an excellent performance in removing TC, especially in the first two hours of operation through the absorption process. In addition, the findings from this research revealed an improvement in effluent water quality when photocatalysis (TiO2/α-Al2O3, with ultraviolet A (UVA) irradiation) was used as the post-treatment following CW, presented by the increase in removal efficiency of OMs of the combined system compared to that of CW alone. This study points to the possible and promising application of the low-cost water treatment system for dealing with OMs and TC in water. View Full-Text
Keywords: constructed wetlands; organic matter; tetracycline; removal efficiency; photocatalysis; water quality constructed wetlands; organic matter; tetracycline; removal efficiency; photocatalysis; water quality
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MDPI and ACS Style

Nguyen, H.T.T.; Chao, H.-R.; Chen, K.-C. Treatment of Organic Matter and Tetracycline in Water by Using Constructed Wetlands and Photocatalysis. Appl. Sci. 2019, 9, 2680. https://doi.org/10.3390/app9132680

AMA Style

Nguyen HTT, Chao H-R, Chen K-C. Treatment of Organic Matter and Tetracycline in Water by Using Constructed Wetlands and Photocatalysis. Applied Sciences. 2019; 9(13):2680. https://doi.org/10.3390/app9132680

Chicago/Turabian Style

Nguyen, Hong Thi Thu, How-Ran Chao, and Kuan-Chung Chen. 2019. "Treatment of Organic Matter and Tetracycline in Water by Using Constructed Wetlands and Photocatalysis" Applied Sciences 9, no. 13: 2680. https://doi.org/10.3390/app9132680

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