Column Studies on Nitrate Removal from Potable Water

摘要: Biological processes can achieve nitrate removal from groundwater. The sulfur/limestone autotrophic denitrification by Thiobacillus denitrificans was evaluated with three laboratory-scale column reactors. optimum ratio determined to be 2:1 (mass/mass). Different hydraulic retention times were used during the tests examine efficiencies. Under an HRTs of 13 h, concentration 60 mgNO3--N L-1 reduced less than 5 mg NO3--N L-1. On a higher HRT 26 h efficiency close 100% for all nitrate-nitrogen loading rates. initial concentrations (30, 60, and 90 L-1) in study. Column showed that rate this study between 50 100 g m-3 d-1 obtain 80–100%. It found approximately 6 SO42- produced 1 removed. Nitrite-nitrogen cases maximum allowable NO2--N Effluent pH stable range 7 8; effluent dissolved oxygen 0.15 oxidation-reduction potential columns –110 –250 mV.