Articles & Case Studies

MSE Hiller Success at Northumbrian Water Bran Sands

Posted: Wednesday 13th November 2013

MSE Hiller have successfully supplied four Hiller Decapress model DP76–402 VAHY centrifuges and a complete spare rotating assembly via JN Bentleys to Northumbrian Water’s Bran Sands sewage treatment works in Teesside as part of a project creating green energy from sludge at the 52 acre, Bran Sands site.

This was a part of the overall £33 million scheme which uses Advanced Anaerobic Digestion (AAD) to treat sludge from the wastewater treatment works, generating biogas which is used onsite in the Combined Heat and Power (CHP) unit.

The project used CAMBI thermal hydrolysis process (THP), using heat and pressure to break down cell walls increasing enzyme hydrolysis and therefore digestion rates. This leads to a 50% reduction in the volume of sludge produced and a significant increase in biogas quantity. The new plant generates some 4.7 MWe from biogas which is used to power the treatment process. Reliance on natural gas has been reduced to less than 1/10th of its former figures, aiding the path to become a self-sufficient plant.

Two of the centrifuges are used to pre thicken sludge prior to the THP plant providing a controlled discharge of cake at 18 % dry solids at flowrates of up to 100 m3/hr each. The HMR5000 control system and accurate hydraulic scroll drive system enables the machine to counter for variances in feed dry solids and continuously optimises machine performance.

Post THP the digested sludge is dewatered at flowrates of 35 to 70 m3/hr using two of the Hiller DP76-402VAHY centrifuges to a cake of > 30 % dry solids prior to disposal off site as a Class A bio solid with no detectable pathogens and as a valuable agricultural fertiliser.




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December 2018

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