STOKE-ON-TRENT, UK – Utility Severn Trent Water has awarded a £20 million design and build contract to Doosan Enpure to deliver an Advanced Anaerobic Digestion (AAD) Plant at Strongford Sewage Treatment Works (STW).
Dutch technology provider Sustec BV will be supplying the Continuous Thermal Hydrolysis Plant (cTHP), said to be the first of its kind in the UK.
The key objectives for the project are to maximise biogas production, reduce sludge volumes, produce an enhanced digestate, while achieving the lowest TOTEX cost.
The AAD plant will be capable of processing 80 tonne dry solids per day (tds/d) on average, with a peak of 94 tds/d, and producing a thermally hydrolysed sludge with a target Dry Solids content of 10% w/w.
The scope of works will include imported screened sludge cake reception, indigenous sludge storage, pre-cTHP screening & dewatering, Sustec Turbotec® cTHP, Doosan Puriser® pasteuriation, upgrading of existing mesophilic anaerobic digesters, liquors treatment, steam generation, upgraded biogas storage and a new waste gas flare.
Generated enhanced biogas will be utilised by the recently installed Gas-to-Grid plant, the existing CHP installation, and the new steam generation system. The Enhanced digestate will be used by the local land bank as a sustainable Bio-fertiliser.
Once complete, the scheme will reduce utilitySevern Trent Water’s carbon footprint by 10 percent through AMP6 and produce an enhanced product for 25 percent of all its biosolids, according to Doosan.
Avtar Jirh, CEO of Doosan Enpure, said: “From the outset of the procurement process, Severn Trent Water indicated that they were willing to consider a range of thermal hydrolysis technologies now available to the marketplace, so I’m very proud that Doosan were able to offer an alternative option, utilising our international technology provider relationships along with our in-house process engineering and EPC capabilities.”
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