HoSt off-takes biogas from Evides Industriewater for biomethane production at WWTP near Vlissingen

1 December 2022
From wastewater to biomethane. This is happening at the industrial wastewater treatment plant (WWTP) Sloe in the Vlissingen port area thanks to a collaboration between Evides Industriewater and the HoSt Group. At the WWTP, an anaerobic water treatment plant produces biogas with a capacity of about 1.6 million cubic metres per year from waste water. HoSt buys this biogas from Evides, upgrades it to biomethane of natural gas quality and injects it into the existing natural gas grid. The technology with a maximum processing capacity of 200 cubic metres of biogas per hour fits into a compact 40-foot unit and is located at the treatment site in Nieuwdorp. Biomethane replaces natural gas and is highly suitable for taking sustainability steps in both existing industry and the built environment.
HoSt Energy as a Service - biogas contracting - Evides

Biogas Contracting as a Service

Within this service model offered by HoSt, HoSt owns the plant and also provides the operational work and maintenance. “This is a particularly simple and effective cooperation model: HoSt takes the biogas at an agreed rate and finances, installs and maintains the biogas upgrader. A company has biogas available and we have the technology and knowledge to get the most value out of the biogas, this way each partner focuses on its core business. Typical HoSt partners for biogas contracts are (industrial) wastewater treatment plants at, for example, breweries, dairies or paper mills. Also applicable with our other technologies, such as renewable energy from thermal conversion of waste wood,” says Tjeerd Smit, director ‘Own and Operate’ within the HoSt Group.

HoSt Energy as a Service - biogas contracting - Evides
“Biogas treatment is not part of our core business so completely outsourcing was a unique opportunity to be completely unburdened in that area”

Fruitfull collaboration

Evides Industriewater follows the same approach for services in the field of industrial water and waste water treatment. Delegating activities to a partner who can best cover the risks creates added value for both parties, customer and supplier. “Initially, we used our produced biogas as a source of heat and power generation through a CHP. Due to expansion of our water treatment plant and our sustainability goals, the then existing plant no longer sufficed and we were able to explore alternative solutions. Processing biogas into biomethane meets our sustainability goals and reduces local exhaust gas emissions. Biogas treatment is not part of our core business, so outsourcing was a unique opportunity to relieve ourselves of all our worries. HoSt offered us a great solution for this,” says regional head of Zeeland Ard-Jan Kasse.

Biomethane: suitable for natural gas grid

At WWTP Sloe, biomethane has been produced since last year. The plant has a capacity to supply about 1,300 homes with gas. In the anaerobic treatment plant, bacteria convert the organic parts in wastewater into biogas and clean water under oxygen-free and controlled conditions. Biogas can be converted by means of a combined heat and power plant (CHP) to heat and electricity or to green gas in a biogas reprocessor. Biomethane production is increasingly being chosen.

At the WWTP in Nieuwdorp, biogas is upgraded to biomethane of natural gas quality using membrane technology. This is necessary because biogas is not directly suitable for the natural gas grid. After treatment and upgrading into biomethane, this sustainable gas is suitable for addition to the existing natural gas grid and can be used directly by consumers and industry in, for example, existing natural gas-fired (central heating) boilers.