%0 Journal Article %A Khezri, Seyed Mostafa %A Gharibi, Majid %A Jafari Mansoorian, Hossein %A Ansari, Mohsen %A Atabi, Farideh %A Tohidi Mogaddam, Taha %A Rashtchi, Nahid %T Efficiency of horizontal roughing filter in removing nitrate, phosphate and chemical oxygen demand from effluent of waste stabilization pond %J Environmental Health Engineering and Management Journal %V 2 %N 2 %U http://ehemj.com/article-1-74-en.html %R %D 2015 %K Wastewater stabilization pond, Horizontal roughing filter, Nitrate, Phosphate, Chemical oxygen demand, %X Background: The effective size of the end grain of horizontal roughing filters (HRFs) is larger than 2 mm. This study aimed to examine the efficiency of HRFs in removing nitrate, phosphate, and chemical oxygen demand (COD) from effluent of a wastewater stabilization pond. Methods: This experimental study was conducted in 2013. The pilot project was transferred to the Karaj wastewater treatment plant (stabilization pond), and the installation, equipping, and start-up of the system began using an effluent treatment plant. Sampling was done from March to August in 3 rates, 0.5, 1 and 1.5 m/h, and included simultaneous sampling from inlet and outlet filtering to determine the concentrations of nitrate, phosphate, and COD. Results: At filtration rates of 0.5, 1, and 1.5 m/h, the average nitrate removal equaled 25%, 32%, and 34%, respectively, average phosphate removal equaled 29%, 26%, and 28%, respectively, and the average COD removal at filtration rates of 0.5, 1, and 1.5 m/h equaled 62%, 66%, and 68%, respectively. Outlet values of phosphate and nitrate were lower than the standards set by the Environmental Standards Organization (ESO) (P < 0.05). Conclusion: According to the results of this study, the HRF function was approximately adequate in COD removal, but its efficiency in nitrate and phosphate removal was lower. %> http://ehemj.com/article-1-74-en.pdf %P 87-92 %& 87 %! %9 Original Article %L A-10-27-16 %+ Environmental Engineering–Water and Wastewater, Islamic Azad University, Western Tehran Branch, Tehran, Iran %G eng %@ 2423-3765 %[ 2015