tailieunhanh - Sewer discharge characteristics and water balance in dry season in Hue, Vietnam

Results showed that hourly variations of flow rate corresponded to the water consumption trend. Average discharge flow rate was equivalent to ± L/cap/day, which was much lower than that on DdRs ( ± L/cap/day). In contrast, pollutant concentrations on DdDs were higher than those on DdRs and fluctuated slightly in a day and among days in a week | Journal of Science and Technology 54 (2A) (2016) 265-272 SEWER DISCHARGE CHARACTERISTICS AND WATER BALANCE IN DRY SEASON IN HUE, VIETNAM Tran Nguyen Quynh Anh1, Hidenori Harada1, *, Shigeo Fujii1, Pham Khac Lieu2, Duong Van Hieu2 and Shuhei Tanaka1 1 Graduate School of Global Environmental Studies, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto, 606-8501, JAPAN 2 Department of Environmental Science, Hue University of Sciences, 77 Nguyen Hue street, Hue city, Vietnam * Email: Received: 15 May 2016; Accepted for publication: 15 June 2016 ABSTRACT Vietnam has been developing sewerage recently. Although sewer discharge quantity and quality data is vital for proper sewage management, their fluctuation has not been well characterized in most of cities in developing countries. This study aimed to characterize a combined sewer discharge in a residential drainage area ( ha) in Hue city, Vietnam on dry days in dry season (DdDs). A 24-hour survey on sewage quantity and quality was conducted at the sewer outlet on two weekdays and two weekends in July 2015. Household water consumption was hourly recorded from water meters for 23 households. Then results of discharge characteristics were compared with those on dry days in rainy season (DdRs) of our previous study. Results showed that hourly variations of flow rate corresponded to the water consumption trend. Average discharge flow rate was equivalent to ± L/cap/day, which was much lower than that on DdRs ( ± L/cap/day). In contrast, pollutant concentrations on DdDs were higher than those on DdRs and fluctuated slightly in a day and among days in a week. Low concentrations of discharge in both dry season and rainy season showed that domestic wastewater in urban Hue was not strongly polluted in terms of organic matter and nutrients. Sewer water balance showed that only 29 % of total water inputted to the sewer system was discharged through the outlet on DdDs, while

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• Sewer discharge characteristics and water balance
• Dry season in Hue
• Combined sewer system
• Residential drainage area
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