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Nitrous oxide (N2O), a potent greenhouse gas, is emitted during nitrogen removal in wastewater treatment, significantly contributing to greenhouse effect. Nitrogen removal generally involves nitrification and denitrification catalyzed by specific enzymes. N2O production and consumption vary considerably in response to specific enzyme-catalyzed nitrogen imbalances, but the mechanisms are not yet completely...
The nitrous oxide (N2O) production from nitrogen removal process was studied in two laboratory sequence batch reactors (SBRs) using domestic and synthetic wastewater, respectively. Results showed that the total N2O-N production reached 2.00 mg/L and 2.5% of influent total nitrogen (TN) was converted into N2O. During the nitrification process, larger amount of N2O was produced with the concentration...
This study has investigated in a comparative fashion the effect of cations and humus soil on the settling and dewatering of activated sludge. The results from experiments indicate that humus soil could enhance the settling and dewatering properties of activated sludge. Cations leaching from the humus soil played an important role in improving settling and dewatering of activated sludge. Divalent cations,...
Humus soil activated sludge (HSAS) process and conventional activated sludge (CAS) process of 400 L/day capacity were set up in lab to evaluate their performance. This study mainly focused on testing Nitrogen and phosphorus removal efficiency and settleability and dewaterability of sludge. The research shows that HSAS process could enhance the removal of nutrient salt, especially TP. It enhanced NH...
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