Partial Nitrification to Nitrite using Activated Sludge Entrapped in Polymerized Gel: Continuous and Batch Operation in an Airlifting Reactor-Recent Advances in Petrochemical Science -Juniper Publishers

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Partial Nitrification to Nitrite using Activated Sludge Entrapped in Polymerized Gel: Continuous and Batch Operation in an Airlifting Reactor

Authored by Zhengjia Zhang*

Partial nitrification to nitrite using activated sludge entrapped in polymerized gel was investigated in an air-lifting reactor in both continuous and batch operations. High-rate partial nitrification to nitrite was achieved under non-limiting dissolved oxygen conditions during the start-up of the reactor. After the stable operation was established, HRT was optimized to achieve the effective ammonium conversion to nitrite and provide the effluent suitable potential for anaerobic ammonium oxidization (ANAMOX). The influences of process parameters, including dissolved oxygen concentrations, temperatures, and initial NH4+-N conditions, on partial nitrification kinetics were studied in batch operation. Data of the batch experiments indicate that it is feasible to achieve 95% ammonium removal with dominant nitrite accumulation under non-limiting DO conditions at the temperature of 24 °C or higher Reaction time affected the nitrite accumulation and the NH4+-N/NO2--N ratio in batch operation. These data demonstrate the potential of using immobilized activated sludge for partial nitrification in continuous and sequencing batch reactors and its applicability as the pretreatment for anaerobic ammonium oxidization process.

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