Gladstone Water Treatment Plant Filter Replacement & Resurfacing

Key capabilities: Concrete remedial & refurbishment works; Specialised coatings; Reservoir construction and refurbishment
Project location: Gladstone, Queensland
Client name: Gladstone Area Water Board
Project duration: September 2016 – June 2017
Project value: $1.0 Million

About the project

The filter walls had deteriorated at the Gladstone Water Treatment Plant and had become hard to clean. The project included full resurfacing of the internal structures with a hard wearing cementitious product to provide a sound quality coating to the structure.

The filter media was replaced to improve performance of the filters at high loading rates, and to increase capacity to meet projected future water demand.

Project scope

The project consisted of the following works:

  • Install of scaffold and access equipment
  • Removal of existing coal and garnet layers via vacuum excavation
  • Replacement of filter nozzles and cleaning of underdrain
  • Protection of adjacent filters by fully encapsulating the filter
  • Sandblast existing coating on filter walls to reach desired surface preparation
  • High pressure water blasting
  • Repairing of defects in concrete structures
  • Re-profiling the surface with a smooth finish repair mortar
  • Top coating of walls with a cementitious product
  • The installation of filter media garnet support layers, filter sand, filter coal layers
  • Plumbing work to re-instate new air-scour lines

Innovations & highlights

  • No LTI during project
  • Pensar managed to complete works while remaining filters were in operation, co-operating with GAWB management and operations with minimal fuss
  • Pensar engaged local trades and labor to assist with the project
  • Filters running at the desired high levels after the replacement of the filter material