2.2.2. Liquid-phase CH4 and N2O measurements
Grab samples were taken in order to determine dissolved CH4 concentrations
at different points of the plant, fromthe influentwastewater to the settled water before it exited the treatment system. In addition,
samples of reject wastewater were collected after the dewatering
process for CH4 analysis. On the other hand, liquid-phase N2O patterns
were followed along theWWTP (from the primary settler to the secondary
settler) for periods of up to 24 h with an N2O microsensor
with data logging (In situ amplifier system, Unisense A/S. Aarhus,
Denmark).