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Sand filtration solution for UK-based maltster

19 July 2016

Hydro International has installed a sand filtration solution to cope with increased wastewater capacity following the completion of new anaerobic digestion facilities at the production headquarters of Muntons, a UK-based maltster. 

Muntons’ Anaerobic Digestion (AD) plant generated one million kilowatt-hours of electricity in its first ten months of operation at the site in Stowmarket.   Muntons turned to water management company Hydro International to supply, install and commission a DynaSand filter to treat additional wastewater capacity at the site, which produces around 120,000 tonnes per annum of ale, lager and food malts.

The DynaSand will provide tertiary effluent treatment, helping to ensure that Muntons meets its environmental commitment to protecting water quality discharged into the River Gipping, which runs along the perimeter of the Stowmarket site.  The DynaSand sand filter has been retrofitted alongside an existing filtration unit to meet Environment Agency consents of 30mg/l of Total Suspended Solids (TSS) with daily capacity of up to up to 1500m3. 

The low-maintenance design and durability of the filter were important considerations, said Ryland Cairns, environmental manager at Muntons:  “Muntons stands strongly by its ethos of ‘practical sustainability’ and the Hydro International solution was chosen for its ease of operation and its reliability. These were essential considerations for ensuring we continue to meet consents and protect the local aquatic environment.

“Wastewater treatment at Muntons’ Stowmarket site is split between two distinct effluent types,” he continued.  “High volumes of effluent with a low Chemical Oxygen Demand (COD), at around 2,000 mg per litre, come from the steeping of the barley grains and are treated by our existing aerobic plant.  

“Lower volumes of high COD washwater from the malting process, at about 30,000 mg per litre, are treated via the new anaerobic digestion facility prior to subsequent aerobic treatment.  The DynaSand® filter provides the final polishing of water following the aerobic process and before it is discharged into the river.”

By keeping waste treatment on site and using a biogas process to generate electricity, Muntons’ AD plant will save 3,000 tanker movements per annum, produce up to 3,000 tonnes of high quality biofertiliser, and contribute to 25% of on-site electricity demand.

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