A Study on Domestic Water Treatment with Corona Discharges and Coagulation-flocculation Method
Main Article Content
Abstract
Abstract- This paper presents the results of domestic water treatment by combining between corona discharges and coagulation-flocculation technology. The corona discharges were generated by a coaxial electrode system with voltages of about 10 kV and 31 kHz in frequency. Total power of a water treatment system is about 90 W. Water flow is 4 L/m in a batch treatment system and electric energy consumption is measured to be 1.125 kWh/m3. Experimental results show that the combination of ozone and UV formed by corona discharges has high efficiency in removing coliforms. The coagulation-flocculation is very necessary for the pretreatment stage of water. After treatment, determined parameters of water conforms with national technical regulation on domestic water quality (QCVN 02:2009/BYT). However, this method still increases the concentration of NO3- inwater after treatment.
Keywords: Domestic water, coagulation-flocculation, ozone, ultraviolet, corona discharges.
References
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[13] S.P. Rong, Y.B. Sun and Z.H. Zhao, Degradation of sulfadiazine antibiotics by water falling film dielectric barrier discharge, Chinese Chemical Letter25 (2014) 187.
[14] N. Shainsky et al., Plasma acid: Water treated by dielectric barrier discharge, Plasma processes and Polymers9 (2012) 1.
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References
[1] Đoàn Thu Hà, Đánh giá hiện trạng cấp nước nông thôn vùng Đồng bằng sông Cửu Long và đề xuất giải pháp phát triển, Tạp chí Khoa học kỹ thuật thủy lợi và môi trường43 (2013) 2.
[2] G.J. Wilbers, M. Becker, La Thi Nga, Z. Sebesvari, F.G. Renaud, Spatial and temporal variability of surface water pollution in the Mekong Delta, Vietnam. Science of the Total Environment 485 (2014) 653.
[3] USEPA, Wastewater technology fact sheet: ozone disinfection, EPA 832-F-99-063, 1999.
[4] USEPA, Wastewater technology fact sheet: ultraviolet disinfection, EPA 832-F-99-064, 1999.
[5] B. Langlais, B. Legube, H. Beuffe and M. Doré, Study of the nature of the by-products formed and the risks of toxicity when disinfecting a secondary effluent with ozone, Water Science Technology25 (1992) 135.
[6] M.J. Sharrer and S.T. Summerfelt, Ozonation followed by ultraviolet irradiation provides effective bacteria inactivation in a freshwater recirculating system, Aquacultural Engineering37 (2007) 180.
[7] I. Panorel et al., Oxidation of aqueous pharmaceuticals by pulsed corona discharge, Environmental Technology34 (2013) 923.
[8] T. Yano et al., Water treatment by atmospheric discharge produced with nanosecond pulsed power, Proc. IEEE int. Power Modulators and High Voltage Conference (2008) 80.
[9] Y. Minamitani et al., Decomposition of Dye in water solution by pulsed power discharge in a water droplet spray, IEEE transaction on plasma science36 (2008) 2586.
[10] B. Pinnangudi, R.S. Gorur and A.J. Kroese, Quantification of corona discharges on nonceramic insulators, IEEE transactions on dielectric and electrical insulation, 12 (2005) 513.
[11] Bộ Y Tế, Quy chuẩn kỹ thuật Quốc gia về chất lượng nước sinh hoạt (QCVN02:2009/BYT), 2009.
[12] Nguyễn Văn Dũng, Mai Phước Vinh, Nguyễn Thị Loan và Phạm Văn Toàn, Nghiên cứu ứng dụng công nghệ plasma lạnh trong xử lý nước, Tạp chí Khoa học và Công nghệ Đại học Đà Nẵng 1 (2017) 11.
[13] S.P. Rong, Y.B. Sun and Z.H. Zhao, Degradation of sulfadiazine antibiotics by water falling film dielectric barrier discharge, Chinese Chemical Letter25 (2014) 187.
[14] N. Shainsky et al., Plasma acid: Water treated by dielectric barrier discharge, Plasma processes and Polymers9 (2012) 1.
[15] Bộ Y Tế, Quy chuẩn kỹ thuật Quốc gia về chất lượng nước ăn uống (QCVN01:2009/BYT), 2009.