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    STUDIA BIOLOGIA - Issue no. 1 / 2007  
         
  Article:   SEASONAL POLLUTION CAUSED BY SEWAGE WASTE WATERS IN THE CRIŞUL ALB RIVER DURING 2005.

Authors:  MARIOARA NICOLETA FILIMON, MIHAIL DRĂGAN-BULARDA. 		 
       
         
  Abstract:  The purpose of this paper was to establish the presence and degree of pollution caused by sewage wastes in the waters of the Crişul Alb River. The seasonal variation of the bacteria associated with the sewage wastes is also reported. The quantitative determinations of coliform bacteria, faecal coliform bacteria and enterococci were established in 10 sampling points along the Crisul Alb River. Based on the results obtained, we classified the waters of Crisul Alb River into two quality classes, I and II (according to the existing regulations). Water of first quality class was registered upstream the river, and of second quality, downstream. The ratio between the coliform bacteria and the enterococci, which is an indicator of the nature of pollution, showed that the water of the Crişul Alb River is in most of cases loaded with bacteria from the human sewage. However, in some sampling points, the pollution was of animal origin. This was the case downstream of Gurahonţ. The water from the Crişul Alb River has a moderate rate of pollution caused by the sewage wastes.  
         
     
         
         
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