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首页> 外文期刊>Croatian Journal of Food Science and Technology >Microbiological quality of drinking water in public and municipal drinking water supply systems?in Osijek-Baranja County, Croatia
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Microbiological quality of drinking water in public and municipal drinking water supply systems?in Osijek-Baranja County, Croatia

机译：克罗地亚奥西耶克-巴拉尼亚县公共和市政饮用水供应系统中饮用水的微生物质量

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摘要

Microbiological and chemical quality of drinking water primarily results from water origin and type of applied water treatment. Since the drinking water is one of the mean way through which many infectious agents can be transmitted to humans causing waterborne diseases, constant monitoring of drinking water quality in water supply systems is needed. This study investigates the microbiological quality of drinking water in twenty five public and municipal water supply systems in the area of Osijek-Baranja County in eastern Croatia. The microbiological analyses were conducted for following parameters: total coliforms, Escherichia coli, colony count at 22 °C and 37 °C, enterococci and Clostridium perfringens. In most of investigated water supply systems processed groundwater are used, and since increased concentrations of some chemical compounds in water can influence on appearance and growth of microbiological populations, in this study relevant physicochemical parameters were also measured and correlated with obtained values of analyzed microbiological parameters. Five physicochemical indicators were determined: temperature, turbidity, pH value, free residual chlorine and ammonium concentration. Results indicated that 149 of 1503 analyzed drinking water samples were non-compliance with microbiological criteria set by Croatian regulations (88.7 % and 89.2 % of 149 had values of colony count at 22 °C and 37 °C higher than the required). Total coliforms, enterococci and Escherichia coli were founded in 3.9 %, 1.1 % and 1 % of non-compliance drinking water samples, respectively. Clostridium perfringens was not detected in any of the drinking water samples. Calculating Pearson’s coefficients of correlation among analyzed microbiological and physicochemical indicators, very weak correlations were obtained. The highest but negative correlation was observed between appearance of microbiological population and concentrations of free residual chlorine (lower free residual chlorine – higher appearance of microbiological population) and positive correlation between turbidity and appearance of microbiological population (higher turbidity – higher appearance of microbiological population).
机译：饮用水的微生物和化学质量主要取决于水的来源和所应用的水处理类型。由于饮用水是许多传染因子可以传播给导致水传疾病的人类的平均方法之一，因此需要对供水系统中饮用水质量进行持续监控。这项研究调查了克罗地亚东部Osijek-Baranja县地区的25个公共和市政供水系统中饮用水的微生物质量。对以下参数进行了微生物分析：总大肠菌群，大肠杆菌，22°C和37°C的菌落数，肠球菌和产气荚膜梭菌。在大多数调查的供水系统中，都使用加工过的地下水，并且由于水中某些化合物的浓度增加会影响微生物种群的出现和增长，因此在本研究中，还测量了相关的理化参数，并将其与所分析的微生物参数的值相关联。 。确定了五个理化指标：温度，浊度，pH值，游离余氯和铵浓度。结果表明，在1503份分析的饮用水样本中，有149份不符合克罗地亚法规设定的微生物标准（149份中的88.7％和89.2％的菌落计数值比所要求的高22°C和37°C）。总大肠菌群，肠球菌和大肠杆菌分别占违规饮用水样品的3.9％，1.1％和1％。在任何饮用水样品中均未检测到产气荚膜梭菌。计算分析的微生物和理化指标之间的皮尔逊相关系数，得到的相关性很弱。观察到微生物种群的出现与游离残余氯的浓度之间的相关性最高，但负相关（游离残留氯含量较低–微生物种群的出现率较高），浊度与微生物种群的外观呈正相关（浊度较高–微生物种群的出现率较高） 。

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