Subicwater’s plant-based wastewater treatment secures patent

Subic Bay Freeport – Wastewater, despite being contaminated, is an abundant source of water. And to ensure that wastewater becomes usable, the Subic Water and Sewerage Company, Inc. (Subicwater) has created a pioneering wastewater treatment technology.

The technology, known as the “Improved Phytoremediation Method of Treating Unsanitary Water such as Wastewater,” or Utility Model No. 2/2024/051285, was granted a patent by the Intellectual Property Office of the Philippines (IPOPHL).

The pilot project, in partnership with the Technological Institute of the Philippines (TIP), offers a low-energy, cost-efficient, and environmentally sound alternative to conventional sewage treatment systems, making it ideal for use in underserved and decentralized communities.

“We are proud to see this homegrown solution officially recognized and protected,” said Dr. Benjamin E. Antonio III, CEO of Subicwater and one of the lead inventors.

He added, “This innovation reflects our ongoing commitment to sustainable service and the value of collaboration between utility providers, academic institutions, and government.”

The patented system, known as the Phyto-Vortex method, operates through three integrated stages. First, it performs skimming and grease removal to eliminate floating solids, fats, and oils from the wastewater.

Next, the water flows through a plant-based filtration process (phytoremediation), where specially selected wetland plants such as vetiver, canna lily, and other native species absorb and break down organic pollutants. Finally, the treated water passes through a vortex polishing chamber, which enhances water clarity, reduces odor, and provides additional aeration before safe discharge.

This process was successfully piloted in 2023 at the Cubi Sewage Treatment Plant under the DOST–CRADLE program, with strong support from the Department of Science and Technology and the Subic Bay Metropolitan Authority. The pilot demonstrated significant improvements in water quality, reduced operating costs, and strong compliance with DENR effluent standards.

With the patent now in place, Subicwater and TIP are planning to offer the technology to local government units (LGUs), water districts, and other utility providers seeking practical solutions for domestic wastewater treatment.

The Phyto-Vortex system is designed to be modular, low-maintenance, and adaptable to local conditions. It provides a promising option for communities that lack the infrastructure or budget for large-scale treatment plants.

Subicwater will support interested LGUs and partners through technical guidance, training, and site-specific design support to ensure effective adoption and operation.

“This is a Filipino-made innovation with national impact potential,” added Dr. Antonio. “We’re ready to bring this forward to communities that want cleaner waterways and more resilient sanitation systems.”