Honolulu advances ash recovery project to increase landfill diversion rates

Honolulu City Council has taken significant steps towards enhancing sustainability in waste management during their recent meeting on May 28, 2025. A key focus was the development of an Enhanced Material Recovery Facility (EMRF) at the H Power waste-to-energy plant, which aims to revolutionize how the city processes ash and recycles materials.

The EMRF will enable the separation and processing of bottom ash and fly ash, which are byproducts of waste incineration. Currently, all ash is sent to the Waimanalo Gulch Landfill, but with the new facility, the city anticipates a substantial increase in waste diversion rates—from 18% to over 90%. This shift is expected to significantly reduce the volume of waste sent to landfills, extending the lifespan of the landfill by up to 50 years.

The facility will not only improve recycling rates but also recover valuable metals from the ash, including ferrous and non-ferrous materials. The process involves grinding and screening the ash to create aggregate materials that can be used in asphalt and concrete, thus providing a sustainable alternative to traditional materials.

Council members expressed enthusiasm for the project, recognizing its potential to address both environmental concerns and the city's growing waste management challenges. The EMRF is currently in the design and permitting phase, with plans to integrate advanced technologies to ensure efficient processing and minimal environmental impact.

In addition to the EMRF, discussions included the incorporation of recycled glass into pavement materials, highlighting the council's commitment to exploring innovative solutions for sustainable infrastructure. However, concerns were raised regarding the complexities of recycling these materials once integrated into pavement.

As Honolulu moves forward with these initiatives, the city aims to set a precedent for sustainable waste management practices, ultimately benefiting the community and the environment. The council's proactive approach reflects a growing recognition of the importance of sustainability in urban planning and public health.