Articles & Case Studies

Siltbuster Supports Five Critical Refurbishment Projects at Severn Trent Water

Posted: Friday 14th August 2020

Siltbuster Process Solutions (SPS), the water treatment specialist, has provided temporary treatment solutions across five different wastewater sites owned by Severn Trent Water.

The sites were undergoing refurbishment by specialist contractors, including MWH Treatment and Nomenca, as part of a capital maintenance programme. SPS, which is the UK’s leading provider for modular and packaged treatment systems for the municipal and industrial wastewater sectors, devised a range of tailored temporary systems which addressed each site’s specific challenges and ensured they remained compliant throughout.

At the Edgmond Road, Lower Penn and Swinford wastewater sites, SPS was tasked with treating sewage waters while reed beds were being refurbished by MWH Treatment.

Paul Cree, Technical Sales Engineer at SPS, explains why these levels were so critical: “It was important to meet these exacting standards as both ammonia and high BOD levels are toxic to aquatic life. In the case of BOD, the oxygen that is available in the water is being consumed by bacteria. If the BOD gets too high, dissolved oxygen levels in the receiving water can decrease to dangerously low levels, threatening fish and other aquatic organisms.

You also need to control the levels of suspended solids discharged, as they cause turbidity in a waterway, making it less transparent by blocking sunlight. This can limit or prohibit the growth of algae and rooted aquatic plants. In rivers, gravel beds blanketed with suspended solids can inhibit or prevent the spawning of fish.”

SPS also supplied a system to treat sewage waters at Severn Trent Water’s Ashby Folville site, providing a temporary solution while capital maintenance refurbishment was carried out by MWH Treatment on the trickling filters. An MBBR20 and MBBR30 were installed in parallel; a system designed with a flow spit of 70:30 respectively, to treat the ammonia concentration in the water to less than 10 mg/l.

The refurbishment work, carried out by Nomenca, of humus tank scraper bridges at Severn Trent’s Barrow and Quorn site was supported by SPS through the installation of three HB50M lamella clarifiers, fed from MT8 distribution tanks.

Lastly, the company provided a temporary treatment solution at Severn Trent’s Cosford site. It was tasked with handling potable water containing suspended solids, all during the replacement of filter media, by MWH Treatment, on the existing wastewater works. One of the main substances of concern in the effluent was manganese, which was treated by SPS’ HB50M and MT8 tank to below the consent limit of 50mg/l.

Andy Guy, Project Manager at MWH Treatment, says: “Working alongside Siltbuster and sharing knowledge allowed these temporary treatment solutions to be well planned and installed in a timely manner, ahead of several process critical refurbishment projects. Siltbuster’s modular systems have proven to be convenient, effective and excellent providers of site resilience.”

Cree concludes: “The breadth of Severn Trent Water sites we’ve supported during this complex programme of works, demonstrates the sheer versatility of our systems, the high standards they operate to and the critical role they can play in keeping sites compliant during maintenance and refurbishment. ”

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August 2021

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