Jacopa Transforms Treatment Plant in Whales
Published on by Water Network Research, Official research team of The Water Network in Business
Wastewater technology and services experts Jacopa have completed a £2.5m design and installation Contract for a DAF solution on behalf of Dŵr Cymru Welsh Water's landmark Swansea wastewater treatment plant
The ingenious solution was provided for client Imtech Process on behalf of Dŵr Cymru Welsh Water. One of Dŵr Cymru's flagship plants, the stylish Swansea works went into operation in 1996 as a "Zero Nuisance Plant", designed to be buried underground with extensive landscaping to disguise its existence from the landward side.
The original facility treatment train consisted of screening, fat, oil, grease and grit (FOGG) removal lanes, primary settlement tanks (PSTs) fitted with lamella plates, a four-lane activated sludge process, final settlement tanks (FSTs) that are also fitted with lamella plates, and UV disinfection as well as sludge treatment. With a need to reduce operating costs and comply with the tightened effluent discharge consent for Swansea Bay, sustainable improvements were needed.
The works have therefore been undergoing a substantial upgrade since 2011 that has modernised many of its treatment systems. Developing innovative process solutions to meet the identified needs for improvements has been challenging because of the restricted underground site.
It was decided that to ensure long-term compliance one key solution was to change the process from the current activated sludge plant with final lamella settlement to moving bed biofilm reactors (MBBRs), and dissolved air flotation (DAF).
Jacopa's remit to convert 11 number FSTs to DAFs faced several challenges, not least that the lamella tanks were underground with access and lifting operations severely hindered. The chosen solution involved designing a frame and chain scraper halfway along the tank, because flow velocities at the surface were calculated to be sufficient for the float sludge to reach the scraped section.
Source: Edie
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