Case Study

Dewatering, Silt Settlement and Ammonia Removal from a Victorian Gasholder

 

Background

The client required the accumulated water within a disused Victorian gasholder to be removed to allow its demolition and the redevelopment of the site for high-end housing. There was potential for high sediment load, high ammonia concentrations, and free-phase hydrocarbons. The gasholder contained an estimated 25 million litres of water. 

KEY POINTS 

  • 10m³/hour abstraction and treatment 

  • 24-hour operation 

  • Remote monitoring and alerts 

  • Continuous compliance with trade effluent consent 

  • Generator powered with managed refuelling 

  • 25 million litres of water treated 

  • Fully bunded system 

Ammonia removal case study

Objective 

Empty the gasholder and treat the water to allow its discharge to sewer under a trade effluent consent within 6 weeks from installation.

The client also required continuous monitoring of the system operation and the system to be installed within a suitable bund. 

Solution 

OEE designed and mobilised a 10m³/hour abstraction and treatment system comprising: 

  • 40m³ primary silt settlement tank 

  • Two 6m³ oil water separators 

  • Two 2m³ sand filters 

  • Two 2m³ granular activated carbon filters 

The system was installed within two days and was operated 24 hours a day until completion.

Key Contacts