consequence of varying four process variables: i) system aeration in the activated sludge section; ii) capture efficiency of particulates in the primary clarifier; iii) the temperature (T) regime in the anaerobic digester; and iv) the control of nitrogen rich returns coming from the sludge treatment. Simulation results show the undesirable effects that energy optimization might have on GHG production: Although off-site CO2 emissions may decrease, primarily as a result of: i) reduced aeration energy requirements; and/or ii) increased energy recovery from the sludge treatment, such effects might be counterbalanced by increased N2O emissions in the activated sludge plant due to the 300-fold stronger greenhouse effect of N2O than CO2. The reported results emphasize the importance of a plant-wide approach and the need to consider the interactions between the different treatment units when evaluating the global warming potential (GWP) of a wastewater treatment plant.
|Number of pages||8|
|Publication status||Published - 2012|
|Event||IWA Nutrient Removal and Recovery 2012: Trends in NRR - Harbin, China|
Duration: 23 Sep 2012 → 25 Sep 2012
|Conference||IWA Nutrient Removal and Recovery 2012|
|Period||23/09/2012 → 25/09/2012|