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CASE STUDY: FORMER COKING WORKS REMEDIATION

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CASE STUDY: FORMER COKING WORKS REMEDIATION
Client: Carillion Regional Civil Engineering
Value: £1,200,000
Activities: Stabilisation, bio-remediation, blue billy.
Specification
VertaseFLI Ltd were engaged to treat coke works wastes at the Former Lambton Coke Works site which was to be redeveloped for residential housing and public open space. The waste types included spent oxides, tar and hydrocarbon impacted soils. Vertase devised a three tier treatment train to address the different waste streams, namely:
  • Bioremediation
  • Stabilisation/solidification
  • Offsite disposal

Stage 1
Waste materials selected for bioremediation comprised light and heavy oil impacted soils. VertaseFLI designed a comprehensive pre-treatment process involving selective excavation and screening to remove oversized and deleterious material. In the first phase of the project, approximately 30,000 m3
 of hydrocarbon impacted soils were bioremediated to levels below the site specific target levels over a 20 week treatment period.

Stage 2 
The material was then fit for reuse in areas of public open space and underneath hardstanding. To avoid costly offsite disposal, VertaseFLI designed a laboratory trial to stabilise the spent oxides, also known as Blue Billy. The trial resulted in two mix designs being trialled on a site scale. The stabilisation process effectively immobilised the cyanide by chemically and physically binding the waste within a cementitious matrix. The resulting stabilised material was fit for reuse onsite beneath public open space.
In the first phase of the project, approximately 5,000 m3
 of Blue Billy waste was stabilised and buried onsite.
The client had quarantined significant volumes of coal tar and tar impacted soils onsite for disposal. VertaseFLI were able to reduce the overall volume of material in this stream by selectively excavating the hazardous waste from the stockpile and bioremediating the remaining soils. This process significantly reduced the client’s offsite disposal costs and enabled a greater volume of waste materials to be remediated for reuse onsite.

Future Works
Further remediation works are planned onsite during 2008 where Vertase FLI will implement larger scale bioremediation and stabilisation works across the remainder of the site.
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