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E.ON Sverige selects HZI for Swedish biomethane-to-grid plant

Hitachi Zosen Inova (HZI) has announced that it has been awarded an engineering, procurement, and construction (EPC) contract by E.ON Biofor Sverige AB for a large dry biomethane-to-grid plant to be built outside Stockholm, Sweden.

Artist rendering of the biomethane-to-grid plant (illustration courtesy HZI).

Artist rendering of the biomethane-to-grid plant (illustration courtesy HZI).

Hitachi Zosen Inova (HZI), a Switzerland-based energy from waste technology provider has announced that it has been awarded an engineering, procurement, and construction (EPC) contract by E.ON Biofor Sverige AB for a large dry anaerobic digestion plant to be built in Högbytorp, about 40 km northwest of the Swedish capital Stockholm.

E.ON Biofor Sverige AB is a subsidiary of E.ON Sverige AB, the Swedish arm of German-headed energy major E.ON AG and one of the largest players in the Swedish gas market. The plant will utilise HZI’s “Kompogas” technology and is the first project for HZI in Scandinavia with this technology.

– We were first and foremost impressed by HZI’s long-standing experience in plant construction and the reliability of the tried-and-tested Kompogas technology, said Hakan Eriksson, Project Director at E.ON Sverige, explaining the reasons behind the company’s decision.

Sweden launched an initiative in 2015 aimed at markedly reducing CO2 emissions and making it the first industrialised nation in the world to become a fossil fuel-free economy. This project marks a particular milestone for HZI.

– We are delighted to be taking on a key role in this project by constructing the plant, while also actively contributing to supporting Sweden achieve its decarbonisation targets at the same time, emphasised HZI CEO Franz-Josef Mengede, CEO, HZI.

Biomethane-to-grid

The highly automated Kompogas plant will form part of a cluster of energy-from-waste facilities at the Renewable Energy Park in Högbytorp. Three state-of-the-art Type PF 2100 steel digesters will process around 83 000 tonnes of green and food waste as well as biowaste every year. The waste will be collected separately and delivered from across the Upplands-Bro region. A sophisticated airlock system will prevent odour emissions escaping from the delivery hall into the surrounding.

The digestion process takes around 14 days, and produces biogas that will be upgraded to 6.8 million Nm3 of biomethane and fed into the gas grid. The resulting digestate will then be dewatered, with the liquid fraction being used as liquid fertiliser by local farmers and the solid material being processed further on site to high-grade compost.

The project schedule envisages engineering work immediately with a start of on-site construction work in September 2017. The first feed into the digester is planned for summer 2018.

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