JLE was engaged by McConnell Dowell Construction to design and construct electrical scope for Gisborne Wastewater Treatment Plant Stage Two upgrade. This includes integration into existing WWTP system and commissioning for all systems. Located in New Zealand’s North Island, this project involves the construction of a secondary clarifier and tertiary treatment facilities to treat domestic wastewater after the existing biological trickling filter. This new infrastructure will be more resilient in the event of natural disasters and will improve water quality. This is an exciting project for the JLE team to continue to build on our extensive track record in wastewater plant construction throughout New Zealand, Pacific & Australasia.
JLE worked in collaboration with McConnell Dowell, Gisborne District Council, CR automation and designers BECA to ensure the project’s key requirements around performance and social outcomes were met within budget.
Stage two works included Supply, construction, installation and commissioning the following new processes:
·New clarifier pump station to transfer the effluent from the biologically trickling filter (BTF) to the new clarifiers
·Ground improvements including engineered rafts
·Lamella type, secondary clarification to remove the gross solids from the effluent
·Scum and sludge underdrain removal system
·Disc-cloth type tertiary filtration system for effluent polishing prior to disinfection
·An in-channel type, ultra-violet disinfection system
·New screw presses for dewatering
·New recycled effluent system which will be used to provide wash water for process related equipment
·Supply and install switchboards, local control panels, VSDs, active harmonic filters, UPS, cable support, cabling