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The Clarke Energy Plant

First WwTW Biogas Upgrading Plant Completed by Clarke Energy France

The City of Perpignan is the first in France to benefit from a Clarke Energy Biogas Upgrading Plant at their WwTW (Sewage Works or “STEP”). The plant will allow the city to make the most sustainable use of the biogas produced, through natural gas grid-injection of the renewable gas. The gas called biomethane is equivalent to natural gas, and is produced by the new Clarke Energy upgrading (raw biogas purification and compression system) at the existing biogas plant at the city's sewage works.

Biogas Upgrading Plant view.
The Biogas Upgrading Plant provided by Clarke Energy. – Click on image to enlarge.

Clarke Energy is a growing multinational specialist in distributed power generation solutions. With their international headquarters are located in Knowsley, near Liverpool, they have been well-known in the UK biogas sector for many years. Although now part of the Kohler organisation, most in the UK waste management sector will remember the origins of Clarke Energy in landfill gas (LFG) utilisation. In particular for the installation of reliable gas engines at an early stage of LFG utilisation in the UK when many were hit by problems with silica and corrosion caused by impurities in the landfill gas.

Their capabilities now range from the supply of gas fuelled power generation engines, through to the turnkey installation of a multi-engine power plants. Clarke Energy is an authorised distributor and service provider for Jenbacher reciprocating gas engines and known for their strong focus on after-sales support.

The following is a copy of their recent Case Study, and notable “first” for France:

First Biogas Upgrading Installation at Perpignan Sewage Plant in France

Clarke Energy has supplied and installed their first biogas upgrading plant at a waste water/sewage treatment plant (STEP) in Perpignan, France.

A general view of the AD plant at the location of the he Clarke Energy Biogas Upgrading Plant.
Perpiganan AD plant general view. Click on image to enlarge.

The membrane treatment technology used upgrades biogas produced from sewage to biomethane and this is the first in project in the French region of Occitania and the Mediterranean Arc.

The renewable gas (biomethane) that is produced is injected into the local gas distribution network

The City of Perpignan decided to upgrade its biogas from sewage treatment plant sludge, to produce biomethane, a renewable gas with the same characteristics as natural gas. Perpignan placed a call for tender for the project, which Clarke Energy replied with a membrane purification platform.

The turnkey biogas upgrading solution installed by Clarke Energy provides treatment, preparation and purification of biogas, guaranteeing a purification rate of 99% and a CH4 rate of 97%. The first cubic metres of biomethane have been injected into the GRDF network and the unit can provide the equivalent of the annual consumption of 1,200 homes.

187Nm3/h of biogas are: dehydrated, desulphurised, filtered, compressed and finally purified; allowing a production of 122 Nm3/h of biomethane. This renewable gas, which meets GRDF requirements, is then injected on the distribution network.

Perpignan entrusted the maintenance of the biogas upgrading plant to Clarke Energy and the operation to Véolia, for a extendable period of 5 years. Clarke Energy are committed to a strong performance guarantee and service availability, with the facility being supported by remote monitoring, facilitating the highest levels of availability from the platform and gains in operating costs.

Key Information

Client: City of Perpignan

Primary Energy: 187 Nm3/h of biogas to 60% of CH4 from WTP sludges

Biogas Upgrading Plant Performance:
Purification rate: 99% guarantee
Biomethane quality : 97% CH4 guarantee

Location: Perpignan (66) France

Commissioning: September 2017

Manufacturer: Membrane Evonik©

Installed by: Clarke Energy

Output power: 7.5 million kWh

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