The Efficiency of Multi-Media Filtration in Drinking Water Treatment Plants for the Removal of Natural Organic Matter

Document Type : Original Article


1 Department of Environmental Engineering, Khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran.

2 Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.

3 Department of Environmental Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

4 4. Department of Environmental Health Engineering, Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

5 Department of Environmental Health Engineering, Abadan University of Medical Sciences, Abadan, Iran.


Background: Filtration is a processing unit in a Drinking Water Treatment Plant (DWTP) that is used to remove particles from the water. This study is the result of pilot-scale research on Gravity Rapid Sand Filter (GRSF). The purpose of this paper was to evaluate the performance of the Triple Media Filter (TMF) (Granular Activated Carbon (GAC) + anthracite + garnet) and Dual-Media Filter (DMF) (anthracite + sand) in the removal of Natural Organic Matter (NOM) as a precursor of Trihalomethanes (THMs) and chlorination Disinfection by-Products (DBPs). 
Methods: Filtration rate was performed at conventional (120 m/d) and a high rate (240 m/d) and compared with full-sized Single Media Filter (SMF) with a sand media. The removal efficiency of turbidity, color, and UV absorption at a wavelength of 254 nm (UV254) and Dissolved Organic Carbon (DOC) parameters were investigated. Besides, the Specific Ultraviolet Absorbance (SUVA) was calculated from the ratio of UV254 to DOC. 
Results: The results showed that the Multimedia Filter (MMF) at 120 and 240 m/d filtration rate had higher removal efficiency compared with a control SMF in removing measured parameters (p<0.05). Also, similar filters have shown the same efficiency relative to each other in different loading rates and there was an insignificant difference. 
Conclusion: MMF can significantly remove organic pollutants and control the formation of DBPs during water treatment. The study suggests that SMF should be replaced with MMF to improve water quality.


Main Subjects

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