Leanyer Sanderson Waste Stabilisation Ponds Inlet Works Upgrade

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BMD Constructions was contracted for the design, supply and construction of a new inlet structure as part of upgrade works at the Leanyer Waste Water Treatment Facilities. The works have improved treatment performance, environmental outcomes, and reduced odour levels at the Northern Territory’s largest wastewater treatment facility. The primary objective of the inlet works was to remove any gross pollutants, such as litter, sediments, plastics, sanitary products and grit, which contribute to the development of surface scum and blockages in the treatment pond system. As a result of the completed upgrade, it is estimated that the new inlet works will remove more than 45 tonnes of unwanted bathroom products and 50 tonnes of grit annually. The inlet works will be able to receive and effectively screen 250 litres of wastewater per second.

Northern Territory

Power and Water Corporation

Water & Wastewater

June 2017 - December 2018

$14.5 million

Complete

BMD performed exceptionally well throughout the entire project and provided added value to Power and Water Corporation.

A strong team culture was maintained by BMD throughout the duration of the project with a focus on achieving high performance through collaboration and innovations.

High risk construction activities were performed safely by BMD at all times and during the wet season. BMD managed all construction activities with pro‐active attitude towards safety and environment with only minimal input from Power and Water Corporation.

Eric, Senior Project Manager, Power and Water Corporation

Scope

The scope of work included:

bulk earthworks
piling works
construction of reinforced concrete inlet structure complete with pump well and elevated inlet structure
construction of access roads
supply and installation of mechanical equipment including lift pumps, band screens, grit classifier system, recycled effluent water filter system and associated above and below ground pipework including recycled effluent and glass reinforced pipe
supply and installation of valves and instrumentation
supply and installation of new electrical switch room and associated high voltage and low voltage works complete with SCADA control
installation of designated odour control system, complete with biotrical filter, caron expansion and odour covers
repair works to existing assets
testing and commissioning of the plant.

Outcomes

BMD Constructions undertook several design optimisations on the project including the removal of a proposed secondary pump station in favour of overland drainage, and the comprehensive consolidation of all mechanical equipment. Both of these initiatives led to key savings for the client.

Further upgrades and maintenance works at the plant were scheduled to commence following the completion of BMD Constructions’ project. As a result of the project team’s collaborative relationship with the client, BMD managed the tight interface to allow for additional works to be carried out by the client without disruption.

Safety was of the upmost priority for the project team, with 65,000 hours worked over the 18 month project duration with no lost time injuries. BMD developed a safe approach to excavate next to the existing treatment ponds to allow for the construction and installation of the inlet pump station. During this operation seepage from the existing ponds was managed to maintain the safety of the excavation.

As a result of BMD’s focus on local industry participation, 90% of the work was delivered locally by over 15 Northern Territory contractors and 85% of material supplied for the project was sourced locally by over 18 Northern Territory suppliers.