Upgrading biogas derived from residual household waste

Overview

Customer: TIRU SA (EDF group) on behalf of SYMEVAD

Location: Hénin-Beaumont, Pas-de- Calais, France.

Purpose: biogas-to- biomethane upgrading for pipeline injection (gas-to- grid)

Order: July 2014

Plant commissioned: September 2015

Context/Background

A replacement for a household waste incinerator in operation since 1972. The local mixed economy company decided to innovate, building a processing plant to assist in the elimination of waste and upgrading the resulting biogas. The site is designed to upgrade the residual household waste collected in 82 districts, which have a total population of 312 000. For this project, SYMEVAD selected a consortium including the engineering group TIRU for the design, construction and operation of the site.

Installation site

Between Arras and Lille, in the north of France, the unit is located on a logistics and multimodal hub. The project benefitted from its location within few metres of the existing gas grid infrastructure.

Plant configuration/background

The plant can treat up to 100,000 tons of waste per year. After being sorted to separate and recycle metals, the remaining waste products undergo various processes, some to be transformed into Solid Recovered Fuel (SRF) - used by cement plants to substitute fossil energy -,and the rest into organic materials for the production of biogas. Greenlane equipment will upgrade the biogas into biomethane for grid injection.

The solution

Greenlane supplied a complete turnkey biogas-to- biomethane upgrading system, including interconnecting pipework, a gas holder for biogas storage, a flare for safety and the central Greenlane ‘Rimu’ upgrading unit - a model suitable for a biogas flow between 250 and 800 cubic metres per hour.

This water-wash upgrading system employs a proven technology proven worldwide. It permits fine control of the product biomethane, compensating for variations in flow and quality of the raw biogas. Like all such units supplied by Greenlane, it uses neither heat nor chemicals in the process, just water. It works without pre-treatment, even with high levels of H2S in the biogas.

Operational outcome

Following a 5-day test campaign on the product gas quality, the site was authorised to inject into the GrDF grid. Over a year, the plant has the potential to produce 2,400,000 Nm3 of biomethane for injection into the gas grid – equivalent to the annual production of 24 GWh of renewable energy or the average consumption of 3000 households.

Conclusion

This project sets the stage for a new generation of ultra-modern waste sorting plant, offering an alternative to incinerators and landfill sites for the processing of household waste residues. The plant is environmentally friendly, with a well- integrated building design, solar panels, with odour control using odour capture and filtration systems. It converts up to 85% of the waste into recycled materials or into renewable energy (SRF and biomethane).

Once again, Greenlane has demonstrated its ability to deliver a state-of- the- art water wash upgrading system, conforming to detailed project planning criteria, while meeting strict safety regulations. The upgrading unit has the flexibility to reliably produce grid-compliant biomethane, from an input biogas of variable quality.