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| Impact of temperature on nitrous oxide emission in a tricking filter |
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Abstract As a powerful greenhouse gas,nitrous oxide (N2O) is found in wastewater treatment plants. The factors influencing N2O emission from a natural-draft trickling filter (TF) was investigated in situ by treating domestic wastewater. The concentration of N2O released from TF varied between 0~18.21×10-6and the amount of N2O emission was estimated to be 20.5~554g N2O/(m3?a), representing 0.1%~0.8% of oxidized ammonia. Variations of N2O emission followed the seasonal weather pattern, with more N2O emission in the summer period and less in the spring. Temperature differences between air and water were the most influential environmental factors governing the nitrification and the N2O emission patterns in TF. The highest N2O emission occurred in July when temperature differences between air and water were minimal, causing insufficient oxygen availability and incomplete nitrification. The daily patterns indicated that N2O emission was closely correlated with the variations of nitrification and temperature differences, which made it possible for using on-line temperature or N2O monitor to identify the nitrification failures.
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Received: 24 January 2014
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