The UK’s first plant recovering phosphorus from wastewater is to open this month.
Canadian company Ostara Nutrient Recovery Technologies has installed the £2m plant at Thames Water’s Slough sewage treatment works.
It will treat sludge liquors – the concentrated, high-nutrient liquid pressed out of sewage sludge and normally returned to works – with magnesium chloride.
This will precipitate out struvite, a mineral containing phosphate, ammonia and magnesium that can be used as a slow-release fertiliser. It will produce about 150 tonnes a year.