Ammonia Removal Technology Selected For Scottish Site Technology from wastewater treatment specialist WPL has been selected by Scottish Water to deliver enhanced ammonia removal at a village treatment works. Tightening environmental consents and an increasing population has led the public utility to upgrade Ferniegair wastewater treatment works in South Lanarkshire. The site has a tight footprint and is in close proximity to residential housing, both important factors considered early in the project design phase, which was carried out by WGM Engineering Ltd. The site serves a population equivalent (PE) of 2,000, including new housing. WPL will provide one Hybrid-SAF (submerged aerated filter) treatment unit, housed in a steel above-ground container to deliver additional ammonia removal at the plant. To enable the WPL Hybrid-SAF to be gravity-fed, avoiding the need for costly and energy-intensive pumping, the unit will be positioned downstream of existing SAF units and upstream of the site’s final settlement tanks.