Efeito da oxigena？？o por agita？？o manual da água na eficiência de inativa？？o de coliformes termotolerantes utilizando luz solar para desinfec？？o em batelada

this study aimed at evaluating the manual agitation effect on inactivation efficiency of thermotolerant coliforms of water bottles submitted to solar disinfection. agitated bottles and non-agitated bottles were exposed to sunlight from 9:00 a.m. to 3:00 p.m. dissolved oxygen (do) and thermotolerant coliforms concentrations were analyzed hourly. the solar disinfection improved the water quality, reducing thermotolerant coliforms concentration by 4 logs (from 1.0 x 106 to 2.6 x 101mpn/100 ml). with the manual agitation, there was considerable oxygenation in the water samples (maximum of 6.61 mg/l in samples with manual agitation and of 5.56 mg/l for those without agitation), but the increase in do had no significant effect on the inactivation of thermotolerant coliforms (p>0.05).