스웨덴에서 압축 천연가스(CNG)에 대한 수요는 비교적 높은 편으로, 공공 버스의 60%는 이미 바이오가스, 바이오에탄올, 바이오디젤 등 재생가능한 에너지자원으로부터 연료를 얻고 있다.

자치단체 상·하수 및 폐수관리 기업인 스톡홀름 바텐 AB(Stockholm Vatten AB) 소유의 Henriksdal 플랜트는 현재 100만 명의 주민이 배출하는 폐수를 처리하고, 폐수 슬러지로부터 바이오가스를 추출해내고 있다. 비스만(Viessmann) 그룹 컴퍼니와의 계약에 따라 카보테크(Schmack Carbotech)는 압력순환흡착(PSA, pressure swing adsorption) 공정을 이용해 천연가스 품질을 업그레이드할 계획이다.

 

 

 

The need for compressed natural gas (CNG) in Sweden is comparatively high, as 60% of public buses already use fuel from renewable energy sources such as biogas, bioethanol or biodiesel.

 

The Henriksdal plant, owned by municipal water, wastewater and waste management company, Stockholm Vatten AB, currently treats wastewater from around one million inhabitants, extracting biogas from sewage sludge.

 

Following a contract with Viessmann Group company, Schmack Carbotech, it will now be purified and upgraded to natural gas quality using the pressure swing adsorption (PSA) process.

 

Through a process of purification, the facility will produce about 180 million kilowatt hours of natural gas quality biomethane annually from the metropolitan area of Stockholm’s wastewater, covering up to 40% of its annual CNG fuel needs.

 

The company previously built a similar plant for upgrading biogas from organic waste in Sofielund, Stockholm in spring 2015.

 

The plant has a capacity to upgrade 3,000 m³/hour of raw biogas. The gas that is produced has a methane content of 97% after purification and is used as biofuel in natural gas vehicles.

 

[출처 = Water World / 2015년 10월 29일]