Scottish Water to construct Bonnycraig water treatment works using PWNT innovations

Plant producing 4MLD utilises PWNT’s ILCA and CeraMac technologies

Scottish Water (SW) has selected PWNT’s CeraMac filtration and In-line Coagulation and Adsorption (ILCA) technologies for the construction of its new-build water treatment plant at Peebles, Scotland. The new plant, shall replace an existing installation dating from 1970 and is expected to become operational in December 2022.

The decision to use PWNT’s technologies at Bonnycraig was made after a series of successful pilots in Invercannie, Turriff, and Marchbank/Bonnycraig in line with two key principles – a plant that would be sustainable, and the minimisation of landscape impact.

Consisting of four C-19 CeraMac vessels and four ILCA 270 vessels, the plant using feedwater from Megget Reservoir is expected to produce 4MLD, and shall be constructed relying on the transportable treatment units (TTUs) developed by Ross Shire Engineering (RSE). RSE’s modular units, complete with PWNT equipment, will be fabricated and assembled in RSE’s Muir of Ord workshops, prior to being transferred to site at Bonnycraig WTW, Peebles. Transporting the completed unit direct to site will overall reduce the MEICA and civil construction impact on the local community and wider environment.

Stewart Sutherland, membrane treatment specialist at Scottish Water, said: “Having tested multiple systems based on key parameters including long-term reliability, we’re pleased to have chosen PWNT’s technologies given their successful implementation in other municipal plants worldwide. Using technology that can ensure the reliable flow of clean drinking water in an effective, robust and sustainable way is certainly beneficial to our constituents.”

Allan Dallas, managing director for RSE, added: “RSE has worked collaboratively with PWNT over the past two years to design a TTU with integrated CeraMac filtration and ILCA technologies. Incorporating PWNT’s standard offering into RSE’s modular TTU system has facilitated a fully off-site fabricated and tested unit, devised for Scottish Water.”

Clement Pierart, COO of PWNT, concluded: “PWNT’s technology has already been successfully implemented in water treatment plants worldwide, with the largest plant to date producing 180MLD commissioned in August 2019 in Singapore. We are pleased that our technology is being applied in Scotland’s latest water treatment plant.

“The ceramic membranes used in CeraMac, produced by our Japanese partners METAWATER, have been proven to last more than 20 years without breakage, and may be disposed of without toxicity; in an era of increased sustainability concerns, we are confident of the benefits our technology brings to both end-users and the environment.”