WATER PAGES
Ammonia removal Technology selected for Scottish site
Technology fromwastewater treatment specialistWPL has been selected by Scottish Water to deliver enhanced ammonia removal at a village treatmentworks.
Tightening environmental consents and an increasing population has led the public utility to upgrade Ferniegairwastewater 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,whichwas carried out by WGMEngineering Ltd. The site serves a population equivalent (PE) of 2,000, including newhousing.
WPLwill 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 unitwill be positioned downstreamof existing SAF units and upstreamof the site’s final settlement tanks.
The patentedWPL Hybrid SAF treatment process creates a unique recirculating flow pattern aswastewater passes through the submergedmovingmedia bed. The high media fill rate of 90-95%and enhanced distributionmean amore open-structured, neutrally buoyantmedia can be used,which reduces both the risk of themedia fouling and the energy required tomaintain a constant
46 scour.
Themodular nature ofWPL Hybrid-SAF units also supports ease of installationwhere access and site footprint are constrained. This site had limited space for newequipment evenwith relocation of existing blowers factored in by project designers.
Built off-site andwith enclosed blowers, the technology is also lowon noise and odour, which is essential in residential areas to reduce any risk of customer complaints.
The Ferniegair unitwill be able to treat 6.4l/s flowand provide approximately 1,000 PE of additional ammonia removal capacity. Thiswill ensure the sitemaintains the Scottish Environment Protection Agency’s (SEPA) ammonia effluent requirement of 20mg/l. The agency’s regulations state the sitemustmeet these standards at least 95%of the time.
WPL utilitymanager AndrewHaywood said: “As a framework supplier to ScottishWater,we are pleased to have been awarded this contract to help futureproof Ferniegairwastewater treatmentworks, enabling it to serve a growing populationwhilemaintaining environmental compliance.
“The design has been tailored to ensure all treatment processes are gravity-fed,with particular consideration given to the levels of pipework connecting the units. In a location with little roomformanoeuvre, getting these levels right is critical if flowinto and out of the treatment tanks is to bemaintained andwe
| June 2021 |
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worked in close partnershipwithWGM Engineering Ltd in design to achieve this.We look forward to the installation phase of this project.”
WGMEngineering Ltd director of technical & design Jason Cramb said: “As a tier one partner to ScottishWater,wewere pleased to once again collaboratewithWPL in the design and installation of another innovative solution. Ferniegair’s location and topography presented a number of design challengeswith respect to space, hydraulics and energy consumption.
“However,working closelywith all stakeholders, a robust solutionwas developed thatwill provide the necessary treatment capacity for future expansion of the local area,whilstminimising disruption to residents.”
ScottishWater projectmanager Richard Morris said: “This is an important scheme whichwill deliver enhanced ammonia removal at our Ferniegair treatment works.WPL is a framework supplierwhose technologywill have a key role in the site maintaining compliance.”
WPL’s onsite installationworkwill be taking place in the spring of 2021. Under its framework agreementwith ScottishWater, the company has recently undertaken projects onwastewater treatmentworks in areas Newtown St Boswells, Canonbie and Winchburgh, all due to be commissioned in 2021.
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