Effect of Nitrogen Load and Water Temperature on Treatment Efficiency of Anoxic Reactor Using Submerged Bed Process

Abstract

The effects of nitrogen load and water temperature on the treatment efficiency were studied using an anoxic rector equipped with a lace-like contact media. Experiments were conducted under various nitratenitrogen (NO₃-N) loads and water temperatures. Temperature coefficients (θ) of 1.046-1.064 were calculated. An equation expressing the relationship between NOx-N removal efficiency, the NOx-N load and water temperature was obtained. From the equation, the NOx-N load that allows a high NOx-N removal efficiency in the anoxic reactor can be estimated, and the value was greatly effected by water temperature. Denitrification rates of 2.4-4.5 mg-N/g-SS·hr under water temperature of 30°C were obtained.