Authors : M.O. Dovlat Abadi, A Rahmani Sani and M. Borghei
Abstract: Based on this study, the effects of two filter materials of pamis and escoria and comparing them with the sand bed were considered and analyzed. Three similar beds were made with 8 days hydraulic detention time and one primary sedimentation tank with 2-h time. One bed was filled as a witnessed test with sand and sec and third beds were filled with pamis and escoria stone for the study. To water the reeds with the urban wastewater, one urban wastewater system was used with these features BOD = 250 mg L–1, TSS = 200 mg L–1, COD = 300 mg L–1 and pH = 7.2, TP = 6 mg L–1, TN = 21 mg L–1; the pilot was used during 1 year and it was used later also. The experiments were done by use of the standard method and analyzed the data using excel software. The results showed that the removal output of COD (79.93%), TSS (90.55%), TP (84%) and TN (86.01%) in the test beds whereas it was 87.91, 94.12, 87.21, 89.15% in escoria beds and 95.94, 97.14, 91.13 and 91.03% pamis beds, respectively. The surface roughness and a big space of porous material in the bed filter is to increase the biofilm on it. It causes an increase in the removal output for carbon and nitrogen-organ materials and the suspended solid. The pamis stone has increased the removal output considerably in the reeds. The escoria stone is lower than pamis and higher than sand in their features. It justifies the use in industrial centers.
M.O. Dovlat Abadi, A Rahmani Sani and M. Borghei, 2016. Optimizing Subsurface Flow Wetland Using Pamis and Escoria Stone. Research Journal of Medical Sciences, 10: 275-281.