Overview

Siltbuster worked alongside JN Bentley at Yorkshire Water's Killinghall WWTW to provide a temporary increase to the treatment capacity of the site, using proven modular treatment plant. This ensured critical flow compliance during construction of the permanent upgrade of the site.

Challenge

The main works was unable to treat the full flow in all conditions and was being upgraded to increase its capacity. With restricted space due to ongoing construction works, the process treatment plant needed to be very compact and still have capacity to treat the high surplus flows the works could receive during storm flows.

Solution

Working with JN Bentley, Siltbuster assessed the site-specific requirements to scope the additional treatment needs and understand any restrictions. A complete side stream treatment plant aligned to site requirements was installed, capable of providing both solids removal and biological treatment. Treating the significant peak flow entering the works reduced the risk to site consent compliance during construction works.

Planning and logistics teams sequenced critical deliveries to align with availability of space, lifting equipment and site personnel. The restricted access to site meant that 11 artic lorries were used to transport the equipment nearby, where the equipment was then transferred to 22 rigid flatbeds for the final delivery to site.

Siltbuster's engineering team installed and commissioned the equipment, as well as training site personnel to operate the plant. Ongoing local site support was also provided by the engineering team for any issues encountered in addition to supporting JN Bentley with remote support. As this was an above ground solution, Selwood and Siltbuster worked together to ensure appropriate pumping solutions and pipework were provided and manage key interfaces effectively.

The side stream treatment plant comprised all necessary flow distribution and pipework, solids removal and biological treatment, as well as ancillary equipment to ease operation and maintenance. Ancillaries included auto-desludge to reduce operator input and walkways to provide safe high-level access.

Siltbuster provided ongoing maintenance and technical support throughout the project.

Siltbuster treatment units were selected as the preferred solution because they provided a tried and tested, robust process within a very compact footprint.

As the permanent works construction phases were completed, the modular nature of the Siltbuster equipment enabled JN Bentley to remove some of the temporary equipment as the new permanent works came online, reducing overall cost.

Aligning with JN Bentley's health and safety priorities, Siltbuster developed the solution with consideration around minimising working at height, in particular. Wherever possible, units were provided with low-level lifting options, avoiding the need to attach at high level (depending on lifting method). High-level pipework connections have extension pieces or pre-fitted pipework to lower the connection point, reducing installation height on site. Finally, high-level side walkways provide safe access to view the process and conduct maintenance.

Following feedback from the JN Bentley site team, Siltbuster provided further internal guidance on lifting and offloading arrangements to minimise the use of high-level lifting points and need for working at height via ladders.