Hasan Aziz, Thacker Neeta, Bassin Jagdish
Analytical Instruments Division, National Environmental Engineering Research Institute (NEERI, CSIR), Nehru Marg, Nagpur - 440 020, India.
J Environ Sci Eng. 2010 Jul;52(3):235-40.
The main goal in using chlorine as water disinfectant is to protect the water in the distribution systems against microbial contamination and to prevent and control re-growth of microorganisms in the water distribution system. Organics in water have the potential to generate harmful disinfection by-products (DBPs) such as trihalomethanes (THMs) as a result of their reaction with chlorine. DBPs are increasingly recognized as cancerous agents. Residual chlorine concentration, temperature and pH are the major factors that influence the rate and degree of THMs formation. Trihalomethanes formation potential (TFP) is very useful test to assess the level of the formation of trihalomethanes. Seasonal variations of TFP of post chlorinated treated water were investigated at six water treatment plants (WTPs) in Delhi City (India).The post chlorinated treated water samples from Bhagirathi, Sonia Vihar, Wazirabad, Nangloi, Okhla, and Haiderpur WTPs were collected just at the outlet before water supply to the consumers. The investigation was based on an intensive bi-monthly sampling program, undertaken from May 2007 to March 2008. Correlation among TFP, residual chlorine, temperature and pH, and their variation throughout the year is also discussed in this paper.
使用氯作为水消毒剂的主要目标是保护配水系统中的水免受微生物污染，并防止和控制水分配系统中微生物的再生长。水中的有机物有可能与氯反应生成有害的消毒副产物（DBPs），如三卤甲烷（THMs）。消毒副产物越来越被认为是致癌物质。余氯浓度、温度和pH值是影响三卤甲烷形成速率和程度的主要因素。三卤甲烷生成势（TFP）是评估三卤甲烷形成水平的非常有用的测试方法。对印度德里市六个水处理厂（WTPs）的后氯化处理水的TFP季节性变化进行了调查。从巴吉拉蒂、索尼娅维哈尔、瓦齐拉巴德、南格洛伊、奥克拉和海德布尔水处理厂采集的后氯化处理水样本是在供水给消费者之前的出水口处采集的。该调查基于2007年5月至2008年3月每两个月进行一次的密集采样计划。本文还讨论了TFP、余氯、温度和pH值之间的相关性以及它们全年的变化情况。
