21 November 2017 by Elizabeth Slow

Permit variation approved for Isle of Wight EfW

The Environment Agency has granted a variation of permit for Amey’s waste treatment facility on the Isle of Wight – to change from gasification to direct burn incineration.

The energy from waste (EfW) facility at Newport is being delivered by contactor Amey for the Isle of Wight council, under a waste collection and treatment contract which will span 25 years.

Amey’s Forest Park development is being built in Newport

The site at Forest Park was awarded planning permission in March 2016. The incineration plant is permitted to treat up to 44,000 tonnes of refuse derived fuel (RDF) per annum.

Moving bed

Earlier this year, work started on the facility with moving bed incineration chosen as the technical solution for the energy plant rather than gasification. (see letsrecycle.com story)

The switch to a direct burn incineration – or ‘moving bed technology’ – followed years of difficulties on the island with its early gasification system that saw various modifications implemented, and which were not always successful.

The choice of a moving bed system comes after a planning application last year by Amey to renovate and rebuild the existing ‘gasification’ plant at Forest Park, which was originally scheduled to be completed by summer 2018.

Gasification technology firm Energos had been sub-contracted by Amey to install the new EfW facility using thermal gasification but the company went into administration in July 2016.

The new EfW system is being delivered by German waste technology provider, Michaelis Environmental Technology.

The application to vary the permit was made in May this year. Following this, the Environment Agency carried out a consultation.

Decision

In its permitting decision, the Environment Agency said: “The operator (Amey LG Limited) has applied for a variation to their permit in order to change the thermal treatment technology type from gasification plant to a direct burn incinerator plant.

“The primary design of such moved bed incinerator allows waste to be introduced into an initial combustion chamber on a refractory lined bed (similar to rotary kiln) which is inclined towards the combustion zone. A series of horizontally mounted paddles rotate to assist moving the waste through the incinerator (as an alternative to ‘moving grate’ transportation).”

Describing the proposed waste facilities overall at Forest Park, Amey said they will include mechanical treatment technology to extract recyclable materials, as well as an advanced thermal treatment centre (ATT), which will create energy from waste which cannot be recycled. The ATT will be able to take up to 40,000 tonnes of waste per year, generating 23,000 megawatt hours of energy per year.

According to Amey, the new facility will help increase recycling rates on the Isle of Wight and will be capable of processing 80,000 tonnes of waste per year in total.

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