At OGM, the efficiency of the PTEF module at MBR tank A has been declining, hence reducing the daily wastewater treatment efficiency by 50%. To address this issue, the plant replaced the MBR in June 2021 to improve efficiency and reduce COD and suspended solids (SS).

Comparison of water quality and quantity before and after MBR improvement

	Monthly Treatment (kL)	COD (mg/L)	SS (mg/L)
Before	9,766	127	16
After	10,628	118	8

 

The plant is assessing the improvement of treatment technology at tank B and the feasibility of adding a third tank to improve wastewater treatment efficiency.