Anaerobic MBT plants for Manchester waste PFI

West Midlands based process engineering company Enpure will be providing anaerobic digestion MBT technology to treat residual solid waste at two of the Greater Manchester Waste sites

Acting as technology provider and specialist sub-contractor to EPC Costain and their clients Viridor, the Laing consortium has been selected as preferred bidder for the Greater Manchester Waste District Authority (GMWDA) PFI Contract.

This project is one of the largest waste PFI projects in Europe, and Costain has been selected by the consortium to provide GBP330m of new waste facilities.

A GBP7M advance works order has already been signed by Viridor/Laing and Costain so Enpure has already begun detailed design work on this project.

We will be building two anaerobic MBT plants, one for North Manchester and one for Bredbury Parkway.

The North Manchester plant will treat some 100,000 tonnes per year of residual waste utilising the existing Dano Drums, followed by anaerobic digestion of the organic fraction of the fines to produce biogas using the BTA Process, and maturation of the digestate to produce a compost like material for landfill remediation.

Using combined heat and power (CHP) the biogas will be converted to green electricity for export to the grid.

The plant also recovers metals, glass and aggregates and grit for recycling.

The Bredbury Parkway plant will treat some 110,000 tonnes per year of residual waste.

A new materials recovery facility is to be provided to recover a high calorific value fuel fraction for energy production, plus metals for recycling.

The organic material is treated by anaerobic digestion using the BTA Process, the biogas is converted to green electricity for export, and the dewatered digestate is dried using waste heat to produce a low calorific value fuel for further energy recovery.

At both treatment facilities the organic fraction of the residual waste will be anaerobically digested using the BTA Process which incorporates the BTA hydro-pulper and grit removal wet pre-treatment system.

The robust, reliable BTA hydro-pulper with a proven track record allows for:.

- High flexibility of waste feeds.

- Effective removal of inert materials.

- Over 90% digestion of organics.

In addition odour control and waste water treatment will be provided at both sites.

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