Indicator bacteria concentrations in three different water sources in Bovilla region in relation to season and flow


1Bovilla Water Treatment Plant, Tirana, Albania 
2Faculty of Biotechnology and Food, Agricultural University of Tirana

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Indicator bacteria are often used to improve water quality management because of the close relation of these microorganisms with most important waterborne disease. These bacteria are used to assess the quality of source water intended for production of water for human consumption. In this study were monitored three different water sources intended for drinking water production. Bovilla reservoir is one of the water source investigated. This reservoir is situated 15 km North-East of Tirana city representing its main source of drinking water supply. The reservoir is fed mainly from Terkuza River which is the second water source, with an annual average flow 3.3 m3/s.  The third water source analyzed was Bovilla Capture better known as Old Bovilla, that is situated 15 km North-East of Tirana at an elevation 269.64 m a.s.l This capture was built in 1973-1974. The capture catches three springs of Bovilla region. These complexes of springs originate from the carbonate complex of Krujë-Dajt ridge and consist of fissure waters and karsts waters. Long term studies have shown that the flow rate of the three springs range from 130 l/s in dry periods up to 416 l / s which is the maximum flow rate delivered from the pipe. Samples were taken weekly and were analyzed for indicator bacteria. The indicator bacteria analyzed were: coliform bacteria, Escherichia coli, fecal enterococci, Clostridium perfrigens, colony count at 370C and colony count at 220C.  The purpose of this study is to determine the indicator bacteria concentration of water sources in Bovilla Region and to assess the impact of seasonal changes on concentrations of these bacteria. Seasonal influences on bacterial concentrations were detected for all sampling sites, with the highest concentrations occurring in autumn season and in winter.

Keywords: water quality; seasonal variation; indicator bacteria; fecal enterococci.

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