Investigation of chlorine decay of water resource in khanbebein city, Golestan, Iran

Document Type : Original Article


1 Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

2 Domestic Water and Wastewater Corporation of Golestan Province, Gorgan, Iran

3 Environmental Health Research Center, Golestan University of Medical Sciences, Gorgan, Iran

4 Department of Environmental Health Engineering, Faculty of Health, Ilam University of Medical Sciences, Banganjab Complex, Ilam, Iran


Aims: The object of the study was to identify chlorine demand factorsin water and chlorine in Kanbebein City water and eliminating of them. Materials and Methods: Concentration of free and combined residual chlorine with the methods presented in the book "Standard Methods for Water and Wastewater Examination" were measured. Other parameters such as: Temperature, TOC, TDS, pH, EC, nitrate, ammonia, total hardness, alkalinity, iron and manganese were also examined before and after of chlorination. Results: The Highest chlorine decay constant in the short time were in water well was 0.895 mgL -1 h -1 and the least amount of it was 0.0097 mgL -1 h -1 and the Highest chlorine decay constant in the long time were in water well was-0.092Lmg -1 h -1 and the least amount of it was-0.0017 Lmg -1 h -1 that correlated with nitrite, ammonia and iron concentration. Conclusion: The factors that affected short-time chlorine decay constant (k 2 ) were nitrite, ammonia and iron and The factors that affected on long-time chlorine decay constant (k 2 ) were Nitrite, ammonia and iron. The material removal techniques for them were the use of natural resins, zeolite, ion exchange, membrane and aeration methods, oxidation and sedimentation, and filtration.


Volume 2, April
April 2013
Pages 1-6
  • Receive Date: 04 February 2023
  • Accept Date: 04 February 2023