ONLINE MONITORING OF NITROGEN GREENHOUSE GASES FROM WATER RECLAMATION PLANTS

It has been reported that water reclamation plant (WRP) engaging biological nutrients removal (BNR) processes can significantly increase urban N2O emissions, where N2O is produced from both nitrification and denitrification stages as an intermediate. As a response to the governmental concern of climate change, a study on online monitoring of N2O emissions from Singapore WRPs has been conducted. This newly established prototype modified based on the USEPA standard method for the in-situ measurement of the surface gas emission has been used for a group of real-time online monitoring at full-scale BNR reactors at two WRPs in Singapore ? Changi Water Reclamation Plant and Ulu Pandan Water Reclamation Plant. Comprehensive 24-h N2O emission profiles of BNR processes in both plants were obtained successfully. This study provided a sight of the N2O emission baselines from the monitored WRPs. Meanwhile, outstanding positive correlations have been observed between nitrite and N2O emission.

Author dc:creator

• WANG MENG

• nitrous oxide, real time monitoring, greenhouse gas, water reclamation plant, gas emission rate