Denitrification Under Aerobic Condition in Draft Tube Spouted Bed Reactor

Abstract

The present study investigates the performance of the draft tube spouted bed reactors of two different sizes on biodenitrification under aerobic condition conducted using Pseudomonas syringae pv kjdr2 (an isolate) immobilized on granular activated carbon (GAC). The time taken to attain steady state increased nearly form 30 to 60 h for a influent nitrate concentration from 100 to 1200 mg/L for given flow rate The maximum nitrate removal of 99.1 % was observed for a nitrate loading of 16.66 mg/L-h where the minimum nitrate removal was 77.2 % for a nitrate loading rate of 600 mg/L-h. For the ratio of influent nitrate loading rate to attached biomass 0.5 g/h-g for reactor-I and 0.42 g/h-g for reactor-II, nitrate removal efficiency decreased to below 90 %. Thus study has generated important design parameter which has a barring of the performance of reactor.