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Contamination of groundwater and surface water with nitrate in the world is considered to be a serious problem. Finding a strategy to remove nitrate from agricultural drainage water before entering the river can play an important role in reducing river water pollution. One possible strategy for nitrate removal is to use denitrification beds. The aim of this study was to investigate the effect of salinity on the performance of denitrification beds to remove nitrate from water. Therefore, Therefore, four denitrification beds with a rectangular cross-section were constructed and sesame straw was poured into them. Input nitrate concentration in the denitrification beds in this study, approximately 50 mg per liter. In order to simulate the inflow, four salinity levels of about 1, 4, 7 and 10 ds/m were used. The experiment was performed in 6 months. The nitrate concentration of the samples was measured with 220 nm wavelength of spectrophotometer. In this study, Excel 2016 software was used to show the effect of salinity on the amount and efficiency of nitrate removal in each denitrification bed. The results showed that in constant hydraulic conditions, beds in higher salinity had lower performance for optimal nitrate removal; However, the performance of the beds designed in salinity levels 1 and 4 ds/m, were similar. According to the results of this study, these bioreactors can be used to remove of drainage water nitrate up to salinity of 4 ds/m. However, it is predicted that there should be a threshold limit value for the salinity level. In general, this study shows that beds designed by sesame straw can be used as optimal beds for nitrate. removal.

INVESTIGATING THE EFFECT OF SALINITY ON THE PERFORMANCE OF DENITRIFICATION BEDS TO REMOVE NITRATE FROM AGRICULTURAL DRAINAGE WATER