A sequencing batch reactor process by adding aluminium sulfate was operated with a different BOD/T-N ratio and Al/P molar ratio to investigate the removal characteristics of nitrogen and phosphorus, and nitrous oxide (N2O) emission from the swine wastewater treatment. The following results can be drawn:
(1) The percentage removal of T-N and T-P were 63.6-78.0% and 83.9-97.3% respectively, and their treatment performance were significantly affected by BOD/T-N ratio of influent and the amount of chemical dosage. Nitrification inhibition by the dosage of coagulant in the addition of 0.2 and 0.5 as Al/P molar ratio was not observed during operational periods.(2) N20 conversion rate decreased with increasing of percentaged enitrification. In particular, N2O emission of low BOD/T-N ratio was more significant than that of high BOD/T-N ratio during the anaerobic process.
