Evaluating Trihalomethane Concentration in Drinking Water and Its Reduction and Removal Methods
The Bagh-e Malek city in the southern part of the Khuzestan province and its water supply system problem is one of its main problems although this problem somewhat is resolved with the authorities attention and the water supply network design and implementation. Usually, in the final stage of water treatment, for disinfecting the system, the chlorination system is used for water treatment plant, tanks and route stations. Due to the reaction between the natural organic materials and free chloride in water, there is a possibility of formation of carcinogenic by-products including the Trihalomethane (THM). According to the established standards in Iran, the acceptable limit of the Trihalomethane in drinking water is about 200 µg/l. In this research, besides the determination of Trihalomethane concentration in the water supply network and Bagh-e Malek urban network, the role of effective parameters and their relationships is studied. In this research, in a one year period, sampling, measurement, and analysis of Trihalomethane concentration for main components were carried out including Chloroform, Bromoform, Dichloromethane and Dibromochloromethane in various seasons of the year from the water supply network, stations, and tanks of the Bagh-e Malek city and also their concentration. According to the results, it was observed that the maximum concentration of total Trihalomethanes (THM) in the sampling period was related to the summer season and was about 35.50 µg/l in the Kouye Reza auxiliary number 7 in Bagh-e Malek. Also, the minimum concentration of THM was in winter and in the water supply network related to the Kouye Emam health center and was about 5.10 µg/l. The analysis of the research data was carried out using the SPSS and Excel software and in a descriptive-inferential level. To analyze the data, the descriptive and inferential statistics with the significance level of 0.05 was used. The results showed that there is not any significant statistical difference between these parameters values and national and international standards and the values are totally desirable and lower than the allowable standards limit.