Cog Moors WwTW AAD Plant
Use of Existing buildings
Engagement with the design teams, supply chain and from site visits identified opportunities for the reuse of existing assets, such as:
A secondary storage tank base was utilised and modified with Pre cast concrete panels to create a split Post Digestion Storage Tank;
Another secondary storage tank base was utilised and modified for the gas holder (and designed to reuse site won materials rather than purchase virgin aggregate, and bring in void formers);
Existing filtrate tank base utilised for a new MCC4 base;
The drainage design incorporated and utilised the existing filtrate / centrate return pumping station rather than build a new one;
The Old boiler / plant room was converted to house MCC1
Advanced Anaerobic Digestion
Advanced Anaerobic Digestion (AAD) Plants take normally 18 months to construct plus 6 months to commission, however by using this off site construction work was completed in 23 months (incl. 3 months delay due to COVID). This resulted in a carbon savings of 1 months less time on site.
Offsite manufacturing de-risked the programme and allowed us to minimise further delays despite the impact of COVID social distancing. COVID-19 had resulted in reduced the number of site personnel required on site by approximately 30%. Offsite manufacturing limited the programme delays that were caused by COVID-19. Such as less travel, less restriction on site, less accommodation required.