Bacterial survival and regrowth in drinking water systems.
Bacterial survival and regrowth in drinking water systems.
复制标题
饮用水系统中的细菌存活和再生。
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
S. Goel
中科院分区：
文献类型：
--
作者：
B. Mahto;S. Goel
对印度理工学院Kharagpur （IITKgp）供水中游离氯和总氯残留量的每周变化及其对微生物浓度的影响进行了监测，以确定异养细菌密度、总和粪便大肠菌群密度以及总和游离氯残留量之间可能存在的相关性。HPC、大肠菌群与游离氯残留量和总氯残留量之间的相关性均不显著，说明在0.01 ~ 0.41 mg Cl2/L和0.02 ~ 1.23 mg Cl2/L的低氯水平下，大肠菌群的生存和生长不受抑制。利用浊度进行生长研究，以测量氯化饮用水中的细菌生长速率。我们还努力建立细胞密度（cfu/L）和浊度（NTU）之间的相关性，这将允许浊度用作实时测量细菌生长的工具。细菌在经氯化自来水稀释10倍的营养液中生长，模拟低底物氯化饮用水环境，平均生长速率为0.196 +/- 0.049 1/h （n = 5, CoV = 25%）。样品中未添加细菌接种剂，总氯残留量为0.14 +/- 0.06 mg Cl2/L，游离氯残留量为0.06 +/- 0.05 mg Cl2/L。
Weekly variations in free and total chlorine residuals, and their impact on microbial concentrations were monitored for the IIT Kharagpur (IITKgp) water supply to determine possible correlations between heterotrophic bacterial density, total and faecal coliform density, and total and free chlorine residuals. All correlations between HPC, coliforms and free and total chlorine residuals were found to be insignificant, suggesting that coliform survival and growth are not inhibited by low levels of residual chlorine ranging from 0.01 to 0.41 mg Cl2/L and total chlorine ranging from 0.02 to 1.23 mg Cl2/L. Growth studies were carried out to measure bacterial growth rates in chlorinated drinking water using turbidity. An effort was also made to establish correlations between Cell Density (cfu/L) and Turbidity (NTU), which would allow turbidity to be used as a tool for measurement of bacterial growth in real time. Bacteria were grown in nutrient broth solutions diluted 10-fold with chlorinated tap water to simulate low substrate chlorinated drinking water environments and the average growth rate was 0.196 +/- 0.049 1/h (n = 5, CoV = 25%). No bacterial inocula were added to these samples and chlorine residuals in these samples were 0.14 +/- 0.06 mg Cl2/L and 0.06 +/- 0.05 mg Cl2/L for total chlorine and free chlorine, respectively.