Microbial quality of water supply to an urban community in Trinidad
Microbial quality of water supply to an urban community in Trinidad
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DOI：
10.4315/0362-028x-65.8.1297
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发表时间：
2002-08-01
影响因子：
2
通讯作者：
Adesiyun, A
中科院分区：
文献类型：
--
作者：
Agard, L;Alexander, C;Adesiyun, A
进行了一项微生物研究，以确定供水的质量，在圣费尔南多适当的城市社区在特立尼达南部使用总大肠菌群和耐热大肠菌群作为水污染的指标。采用滤膜法分别在琼脂和MFc琼脂上检测总大肠菌群和耐热大肠菌群。用市售试剂盒测定水库、沿着配水管和居民生活用水中的余氯水平。在从家庭获得的104个饮用水样本中，84个（80.8%）。总大肠菌群、耐热大肠菌群和大肠埃希菌阳性分别为56株（53.8%）和70株（67.3%），差异有统计学意义（P < 0.05，χ 2）。从供水和污水管理局（WASA）的主要供应到家庭的81个水样中，38（46.9%），13（16.0%）和27（33.3%）的总大肠菌群，耐热大肠菌群和大肠杆菌污染。大肠埃希氏菌、大肠埃希氏菌、沿着配水管的39个水样中有8个（20.5%）总大肠菌群检测呈阳性，而4个（10.3%）耐热大肠菌群检测呈阳性。从水库获得的所有五个经处理的水样本的大肠菌群检测呈阴性。有一个显着的差异（P = 0.004），在平均余氯水平的水从水库，水从竖管，从家庭用水。同样，随着余氯水平的下降，水中总大肠菌群的流行率从0.0%（经处理的水库水）到15.2%（竖管）到53.5%（家庭主管道）再到80.0%（家庭饮用水），在统计学上也有显著增加（P = 0.004）。饮用水和WASA主要供应给家庭的水中总大肠菌群的流行率也存在统计学显著差异（P < 0.001，χ 2）。在105 E。大肠埃希菌中粘液型7株（6.7%）、16株（15.2%）、22株（21.0%）。溶血性和非山梨醇发酵菌。分别得出的结论是，家庭饮用水的高度污染对消费者的健康构成危害。
A microbiological study was conducted to determine the quality of the water supply to an urban community in San Fernando proper in south Trinidad using total coliforms and thermotolerant coliforms as indicators of water pollution. The membrane filter technique was used to detect total coliforms and thermotolerant coliforms on endo agar and MFc agar, respectively, The residual chlorine levels in water from the reservoir, from standpipes along the distribution line, and from households were determined with a commercial test kit. Of a total of 104 drinking water samples obtained from households, 84 (80.8%). 56 (53.8%), and 70 (67.3%) tested positive for total coliforms, thermotolerant coliforms, and Escherichia coli, respectively, The difference was statistically significant (P < 0.05, chi(2)). Of the 81 water samples collected from the Water and Sewerage Authority (WASA) main supply to households, 38 (46.9%) 13 (16.0%), and 27 (33.3%) were contaminated by total coliforms, thermotolerant coliforms, and E. coli, respectively, and the difference was statistically significant (P < 0.05, chi(2)). Eight (20.5%) of 39 water samples from standpipes along the distribution line tested positive for total coliforms, compared with 4 (10.3%) samples testing positive for thermotolerant coliforms. All five samples of treated water obtained from the reservoir tested negative for coliforms. There was a significant difference (P = 0.004) in the mean residual chlorine levels in water from the reservoir, water from standpipes, and water from households. Similarly, as the level of residual chlorine decreased, there was a statistically significant (P = 0.004) increase in the prevalence of total coliforms in water from 0.0% (treated reservoir water) to 15.2% (standpipe) to 53.5% (household mains) to 80.0% (household drinking water). There was also a statistically significant difference (P < 0.001, chi(2)) in the prevalence of total coliforms in drinking water and in water from the WASA main supply to households. Of the 105 E. coli strains tested, 7 (6.7%), 16 (15.2%), and 22 (21.0%) were mucoid. hemolytic, and non-sorbitol fermenters. respectively. It was concluded that the high degree of contamination of drinking water in households poses a health hazard to consumers.