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Contract awarded for UK-first ‘continuous' THP plant

Contracts have been awarded for the development of an advanced anaerobic digestion plant near Stoke-on-Trent which will include a type of thermal hydrolysis never used before in the UK.

The project will use SusTec's TurboTec technology for continuous THPThe project will use SusTec's TurboTec technology for continuous THP

Doosan Enpure has been awarded the design and build contract worth more than £20M for the project at Severn Trent Water’s Strongford Sewage Treatment Works. Doosan will be working collaboratively with its partners, North Midland Construction (NMC Nomenca), and Dutch technology provider Sustec BV, which will be supplying its Continuous Thermal Hydrolysis Plant (cTHP) - Turbotec - for the first time in the UK.

Strongford, which serves Newcastle-under-Lyme and Stoke-on-Trent and had a population equivalent of 350,000, is a strategically important project for Severn Trent as it demonstrates its commitments to reduce its carbon footprint by 10% through AMP6, and to put 25% of its biosolids through a process which creates an enhanced product.

The key objectives for the project are to maximise biogas production, reduce sludge volumes, produce an enhanced digestate and achieve the lowest TOTEX cost; it comes against the backdrop of Ofwat’s Water 2020 initiative to open up the sludge market.

As a regional sludge treatment centre, the new AAD plant will need to handle indigenous and imported thickened raw sludge (primary and secondary), imported raw sludge cake and imported industrial trade effluent. The plant will be capable of processing 80 tonnes of 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.

In order to achieve such an output, 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. The enhanced biogas generated 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.

Avtar Jirh, Chief Executive Officer 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. We are excited to be working with Sustec BV to deliver the first continuous thermal hydrolysis plant in England and in addition we look forward to further cementing our relationship with North Midland Construction who are already our partner in the DNM Alliance, working together with Severn Trent on the Birmingham Resilience Project”.

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