Plant capacity and expected performance:
| • 20,000 metric tonnes DS/year |
• Doubled digester loading |
| • 2 x 4000m³ digesters |
• Doubled biogas production |
| • 4-reactor Cambi THP+coolers |
• Class A pasteurized cake |
| • Extra 1.5 MW green electricity |
• Avoiding lime operations |
On 18th June 2007 Cambi signed a binding Letter of Intent with Black & Veatch/Gleeson, main
contractor for Anglian Water’s Whitlingham sludge centre upgrade.
Whitlingham (Norwich WWTW) serves a population equivalent of approx. 275,000 but also
imports half of its sludge from other sites.
Currently only half of this is digested – the remainder is dewatered raw and treated with
quick lime. A 4 reactor Cambi THP system is being added to enable all the raw sludge
to be digested. The digester biogas and electrical generation will also be upgraded.
The plant is a BNR treatment plant and in this case a separate ammonia treatment system
is being added. Cambi THP was chosen on a best whole-life cost.
The benefits of the Cambi process are:
• The cost of the lime operation is avoided without building any more digesters
• Biogas production will be more than doubled and another 1.5 MW of electrical generation will
be installed
• The overall volume of product is reduced and the amount of land required for spreading is
reduced because of N removal in the process
• All sludge is Class A and can be stored on site for 6 months or more.
