Lagoon Dredging in VIC - TDG Environmental

case study

Lagoon Dredging in VIC

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The scope of works comprises:

  • Development of EHS and QMS Management Plans, recognizing the constraints for
    the site.
  • Site preparation for access and for biosolids drying area, as required
    Mechanical removal of biosolids from the lagoons, air drying, and stockpile as

    • Remove sludge from aerated lagoons 1 and 2, and air dry on land preferably
      immediately west of the lagoons.
    • Leachate and liquors from the drying area are to be directed to Lagoons 1
      and 2
    • Stockpile dried biosolids in an area east of the lagoons where biosolids
      from previous desludging are stored.
    • Site reinstatement of biosolids drying area, as required to pre-works profile and
      lines and levels.
    • Undertake a post desludging survey to confirm that the combined residual biosolids
      that remain in lagoons 1 and 2 does not exceed 5 percent of the original GVW agreed biosolids volume.
    • Site restoration and clean-up


  • Challenging site with less-than-ideal conditions for sludge drying.
  • Environmentally sensitive site with creek running along the back of the site.
  • Challenging site due to proximity of residential estate.

The outcome

After developing a robust set of management plans to deal with the challenges of the site backed up by a proven history in being able to deliver high level outcome on similar sites TDG was awarded the project.

In spite of the challenging site, tight time frames & environmentally sensitive location TDG were able to successfully delver the project in line with the project scope on time and on budget. By using local suppliers and a team of experienced internal operators the lagoons were desludged, sludge dried and stockpiled safely and in line with the project plan submitted to the client prior to mobilization.

TDG’s unmanned (remote operated) dredge is unmatched when it comes to delivering efficient desludging of wastewater lagoons. The minimal footprint requirements of the equipment profile make it an ideal solution for sites that have challenging site constraints.





Project Highlights

  • Use of local providers for earthmoving works.
  • Able to complete the work on time and on budget.
  • Successfully completed the work in a challenging environmentally sensitive site to the client’s satisfaction.

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