하수처리시설에서 염분농도가 질소제거 효율에 미치는 영향: 구룡포 하수처리시설을 대상으로

초록

This study analyzed the effect of salinity on wastewater treatment processes, particularly focusing on nitrification. The case study was conducted at the Guryongpo Wastewater Treatment Plant, which applies the DeHASS process. In this process, ammonium (NH₄⁺-N) is first oxidized to nitrite by nitrifying bacteria, and then ammonium and nitrite are converted into nitrogen gas by anammox bacteria. Based on water quality data from 2019 to 2023 and field samples collected in 2024, concentrations of NH₄⁺-N and NO₃⁻-N at each treatment stage were analyzed, and treatment efficiency was evaluated according to salinity levels. The analysis revealed that when salinity exceeded 5‰, the nitrification rate decreased to below 60%, and when salinity exceeded 9‰, it fell to below 50%. These results suggest that wastewater treatment plants expecting high-salinity influent should implement countermeasures such as securing sufficient hydraulic retention time in the influent tank, introducing automated salinity monitoring systems, and utilizing halotolerant microorganisms.

키워드