Las Piñas WRF Shows How A2O Is Being Applied to Large-Scale Wastewater Design

PHILIPPINES • ENGINEERING

Maynilad’s Las Piñas Water Reclamation Facility was designed for up to 88 million liters per day, serving around 360,000 residents across 20 barangays. The facility uses an Anaerobic-Anoxic-Oxic (A2O) biological treatment process and was designed around DENR effluent requirements.

The project highlights an important direction in modern STP engineering: designers increasingly need to consider not just BOD and suspended-solids removal, but also nitrogen, nutrient management, internal recycle, aeration control and process stability.

For smaller Philippine projects, the same engineering principles can be adapted to modular AAO/A2O configurations.