A Survey of Cryptosporidium Oocysts in Water Supplies during a 10-Year Period (2000-2009) in Seoul
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초록
This study has been conducted to estimate the occurrence of Cryptosporidium oocysts in water supplies in the Metropolitan area of Seoul, South Korea, for 10 years from 2000 to 2009. Water samples were collected quarterly at 6intakes in the Han River and its largest stream and 6 conventional Water Treatment Plants (WTPs) serving drinking water for 10 million people of Seoul. Cryptosporidium oocysts were found in 22.5% of intake water samples and arithmetic mean was 0.65 oocysts/10 L (range 0-22 oocysts/10 L). Although the annual mean of oocyst number was as low as 0.04-1.90oocysts/10 L, 3 peaks in 2004 and 2007 were observed and the pollution level was a little higher in winter. The lowest density was observed at Paldang intake and the pollution level increased at Kuui and Jayang intakes. At the end of the largest stream, oocysts were found in 70% of collected samples (mean 5.71 oocysts/10 L) and it seemed that its joining the Han River resulted in the increase at Kuui intake and downstream. Oocyst removal by physical process exceeded 2.0-2.3 log and then all finished water samples collected at 6 WTPs were negative for Cryptosporidium in each 100 L sample for 10 years. These results suggested that domestic wastewater from the urban region could be a source of Cryptosporidium pollution and separating sewage systems adjacent to the intakes could be meaningful for some intakes having weakness related to parasitological water quality.
Abstract
This study has been conducted to estimate the occurrence of Cryptosporidium oocysts in water supplies in the Metropolitan area of Seoul, South Korea, for 10 years from 2000 to 2009. Water samples were collected quarterly at 6intakes in the Han River and its largest stream and 6 conventional Water Treatment Plants (WTPs) serving drinking water for 10 million people of Seoul. Cryptosporidium oocysts were found in 22.5% of intake water samples and arithmetic mean was 0.65 oocysts/10 L (range 0-22 oocysts/10 L). Although the annual mean of oocyst number was as low as 0.04-1.90oocysts/10 L, 3 peaks in 2004 and 2007 were observed and the pollution level was a little higher in winter. The lowest density was observed at Paldang intake and the pollution level increased at Kuui and Jayang intakes. At the end of the largest stream, oocysts were found in 70% of collected samples (mean 5.71 oocysts/10 L) and it seemed that its joining the Han River resulted in the increase at Kuui intake and downstream. Oocyst removal by physical process exceeded 2.0-2.3 log and then all finished water samples collected at 6 WTPs were negative for Cryptosporidium in each 100 L sample for 10 years. These results suggested that domestic wastewater from the urban region could be a source of Cryptosporidium pollution and separating sewage systems adjacent to the intakes could be meaningful for some intakes having weakness related to parasitological water quality.
참고문헌 (25)
- McLauchlin J, "Molecular epidemiological analysis of Cryptosporidium spp. in the United Kingdom: results of genotyping Cryptosporidium spp. in 1705 fecal samples from humans and 105 fecal samples from livestock animals", J Clin Microbiol, 38, pp.3984~3990 (2000)
- Craun GF, "Waterborne outbreaks of cryptosporidiosis", JAWWA, 90, pp.81~91 (1998)
- Herwalt BL, "Waterborne diseases: 1993 and 1994", JAWWA, 88, pp.66~79 (1996)
- Korich DG, "Effects of ozone, chlorine dioxide, chlorine, and monochloramine on Cryptosporidium parvum oocysts viability", Appl Environ Microbiol, 56, pp.1423~1428 (1990)
- Dupont H, "Infectivity of Cryptosporidium parvum in healthy volunteers", New Eng J Med, 332, pp.855~891 (1995)
- Wallis PM, "Prevalence of Giardia cysts and Cryptosporidium oocysts and characterization of Giardia spp. isolated from drinking water in Canada", Appl Environ Microbiol, 62, pp.789~797 (1996)
- LeChevallier MW, "Occurrence of Giardia and Cryptosporidium spp. in surface water supplies", Appl Environ Microbiol, 57, pp.2610~2616 (1991)
- Karanis P, "Distribution and removal of Giardia and Cryptosporidium in water supplies in Germany", Wat Sci Tech, 37, pp.9~18 (1998)
- Chai JY, "An epidemiological survey of Cryptosporidium parvum infection in randomly selected inhabitants of Seoul and Chollanam-do", Korean J Parasitol, 34, pp.113~119 (1996)
- 유재란, "Prevalence of cryptosporidiosis among the villagers and domestic animals in several rural areas of Korea", The Korean Journal of Parasitology, 42(1), pp.1~6 (2004), 대한기생충학회
- Lee MY, "Detection of Giardia and Cryptosporidium in water supplies in Seoul using Method 1623", J Korean Soc Water Quality, 16, pp.595~608 (2000)
- Lee MY, "Occurrence and characteristics of Cryptosporidium, Giardia and indicator bacteria from sewage treatment plant", In Autumn Conference of Korean Soc Water Quality and Korean Soc Water Wastewater, pp.73~76 (2000)
- USEPA, "Method 1623: Cryptosporidium and Giardia in water by filtration", IMS, pp.1999, ~
- USEPA, "National primary drinking water regulations. long term II enhanced surface water treatment rule (pre-proposal draft for stakeholder review)", EPA, ~ (2001)
- 이목영, "환경수 중 크립토스포리디움 오시스티 및 지아디아 시스트 거물의 정확도 및 회수율 향상을 위한 연구", 미생물학회지, 39(1), pp.27~35 (2003), 한국미생물학회
- Haas CN, "Developing an action level for Cryptosporidium", JAWWA, 87, pp.81~84 (1995)
- Chai JY, "High prevalence and seasonality of cryptosporidiosis in a small rural village occupied predominantly by aged people in the Republic of Korea", Am J Trop Med Hyg, 65, pp.518~522 (2001)
- Medema GJ, "Survival of Cryptosporidium parvum, E. coli, faecal enterococci, C. perfringens in river water: influence of temperature and autochthonous microorganisms", Water Sci Technol, 35, pp.249~252 (1997)
- Chauret C, "Correlating Cryptosporidium and Giardia with microbial indicators", JAWWA, 87, pp.76~83 (1995)
- Hashimoto A, "Cryptosporidium oocysts and Giardia cysts in Sagami River and its tributaries", J Jpn Soc Water Envron, 21, pp.119~122 (1998)
- Hashimoto A, "Prevalence of Cryptosporidium oocysts and Giardia cysts in the drinking water supply in Japan", Water Res, 36, pp.519~526 (2002)
- LeChevallier MW, "Giardia and Cryptosporidium spp. in filtered drinking water supplies", Appl Environ Microbiol, 57, pp.2617~2625 (1991)
- Niminski EC, "Removing Giardia and Cryptosporidium by conventional treatment and direct filtration", JAWWA, 87, pp.96~106 (1995)
- Dugan NR, "Controlling Cryptosporidium oocysts using conventional treatment", JAWWA, 92, pp.64~76 (2000)
- Patania NL, "Optimization of filtration for oocyst removal", AWWA Research Foundation, ~ (1995)