Northern Ireland Water
Maghera, Northern Ireland
DAWSON-WAM Ltd. was appointed by Northern Ireland Water to design and construct a new wastewater treatment works on an existing site to introduce new advances in the wastewater treatment technology to an existing outdated filter-bed facility. The works included the construction of an inlet works, primary, secondary and final treatment, plants, FE pumpaway to Knockloughrim WwTW along with sludge and storm storage facilities.
Gulladuff is a small rural treatment works for Gulladuff village, Co. Londonderry. It serves a current population equivalent of 694which is expected to grow to 889 for the 2035 design horizon.
Solution development included:
Design of Process, MEICA and Civil works included the accurate sizing and selection of Primary Settlement, RBC Secondary Treatment Units & Final Settlement Tanks to meet both current and future flows and loads.
Process and MEICA requirements included:
Civils Works included:
Planning was a key element of the project as the site was located on a small footprint. To construct this works whilst still maintaining consent standards required the use of a temporary treatment plant. We proposed the use of a temporary SAFF treatment plant with a single primary and final settlement tank. We were able to utilise the existing inlet pumping station to transfer sludge to the existing sludge holding tank at the site entrance, thus removing tanker movements within our construction area. Once operational, the existing works was taken off-line allowing unrestricted uninterrupted construction.
The works was subject to standard NIW level 1, 2 & 3 testing regimes and fully tested/commissioned. Once the works was handed over to NIW we continued to provide operational and maintenance assistance to NIW for a minimum period of 6 months.