期刊名称：Environmental Health Engineering and Management
印刷版ISSN：2423-3765
电子版ISSN：2423-4311
出版年度：2015
卷号：2
期号：2
页码：87-92
语种：English
出版社：Kerman University of Medical Sciences
摘要：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..
