Occurrence of Giardia cysts and Cryptosporidium oocysts in raw and treated water from two water treatment plants in Selangor, Malaysia

The occurrence of Giardia cysts and Cryptosporidium oocysts was determined both in the raw water and the treated waters from two water treatment plants in Selangor, Malaysia between July 1994 and January 1995. At each treatment plant, raw and treated water samples were collected fortnightly on 10 se...

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Bibliographic Details
Published in:	Water research (Oxford) Vol. 31; no. 12; pp. 3132 - 3136
Main Authors:	Ahmad, R.A., Lee, E., Tan, I.T.L., Mohamad-Kamel, A.G.
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 01-12-1997 Elsevier Science
Subjects:	Applied sciences Cryptospordium Drinking water and swimming-pool water. Desalination Exact sciences and technology Giardia Malaysia occurrence Pollution raw ater Water treatment and pollution water treatment plants Asia Malaysia water treatment plants Giardia Malaysia Cryptospordium occurrence raw ater Drinking water treatment Protozoa Apicomplexa Cryptosporidium parvum Drinking water treatment plant Cyst Measurement result Diplomonadida Giardia duodenalis Oocyst
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Summary:	The occurrence of Giardia cysts and Cryptosporidium oocysts was determined both in the raw water and the treated waters from two water treatment plants in Selangor, Malaysia between July 1994 and January 1995. At each treatment plant, raw and treated water samples were collected fortnightly on 10 separate occasions. Physical parameters, including dissolved oxygen, pH, temperature, conductivity, turbidity and free and total chlorine were measured, and samples were also taken for faecal coliform analyses. The isolation and enumeration of cysts and oocysts was according to UK standard methods. Whilst Giardia cysts were detected in 90% of the raw water samples (range 0–60 cysts per litre) no Cryptosporidium oocysts were detected. Higher concentrations of cysts were detected in the raw water of the first treatment plant. All raw water samples were faecally contaminated, as faecal coliform counts ranged from 4.6 × 10 4 to 1.3 × 10 5 colony forming units per 100 ml. No correlation between the concentration of Giardia cysts and the concentration of faecal coliforms could be demonstrated statistically, nor was there any correlation between the concentration of Giardia cysts and the physical parameters tested for any of the raw waters. No cysts, oocysts or faecal coliforms were detected in samples of treated water.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0043-1354 1879-2448
DOI:	10.1016/S0043-1354(97)00164-4