Performance Evaluation of Natural Straw in Removal of nitrogen compounds from Khuzestan sugarcane Fields drainage water

the present study investigated the efficiency of natural reeds on a real scale in qualitative treatment of incoming drainage water of Khuzestan sugarcane during a period of one year (2010-2011). The efficiency of natural reeds was evaluated by measuring parameters such as NO3, NO2, NH4 and TN. T-test results on NO3, NO2, NH4 and TN factors showed that there is a significant difference between ST0-ST1, ST0-ST2, ST0-ST3, ST1-ST2, ST1-ST3, ST2-ST3 stations (1%). The highest mean difference in NO3, NO2, NH4 and TN was observed between ST0-ST3 stations. At ST3 station, which has the greatest distance from the entry point, the highest removal efficiency was obtained for each of the nitrogen compounds. The mean removal for NO3 factor in the outlet drainage water in ST1, ST2 and ST3 stations was 23, 50 and 64% lower than the initial amount in the inlet drainage water, respectively. At ST3 station with an average of 0.02 mg / l, the lowest amount of NO2 was observed. The use of natural reeds reduced NH4 compared to the initial level. This decrease was greater at ST2 and ST3 stations and ST3 station had the largest decrease (70, 68, 67 and 68% in all four seasons of spring, summer, autumn and winter, respectively). The trend of TN changes compared to the initial rate was similar to the trend of NH4 changes, but the rate of TN decrease at ST3 station was more severe and reached the lowest possible value compared to ST1 and ST2 stations. The results showed a significant effect of reed application in reducing TP in this distance from the entry point. In different stations, with increasing distance from the entry point, the effect of retention time (1.26, 1.10, 1.30