Die Ingenieurbüro Buse GmbH Biogas processing
Within this branch of business Ingenieur Buero Buse GmbH carries out its own plant construction. In a company owned pilot plant on a technical scale, bio methane is continuously treated to upgrade to natural gas quality. The Treatment method has been developed independently by our company. It is a patent pending process PCT/EP2012/052956.
The Ingenieurbuero Buse GmbH offers consulting, design, construction and commissioning of biogas upgrade plants.
Targets of biogas upgrading
As well as the energy source methane (CH4) biogas contains huge amounts of obstructive carbon dioxide (CO2) and also significant levels of corrosive hydrogen sulfide (H2S).
The methane content is usually around 50 – 60%. The other 40 – 50% are various unwanted gases.
With the gas treatment described below an enrichment of the methane concentration to 95% or higher is possible.
State of development
The new membrane process is currently in a very promising test phase which has been running for 18 months.
The pilot plant is set up on a biogas producer’s site and works with a partial flow of the biogas. The partial flow of the biogas will be conditioned and examined in order to optimize the process and to enable the scale up of the design to industrial plants sizes.
In this actual case the biogas is dried and desulfurized.
Conditioning in two steps
Step 1: CO2 removal by degassing membrane
First water will be pumped from the circulation tank through the degassing membrane
Removal of CO2 from the circulating water will be done by using strip gas (ambient air)
Step 2: CO2 absorption from the biogas by using a gas exchange membrane
The de-gassed water flows through a gas exchange membrane and the CO2 of the biogas goes through the membrane into the water. The CO2 components of the biogases will be absorbed by the degassed water
Advantages of the process
- Energy use is much lower compared to known existing processes
- Low space requirements due to the application of membrane technology
- Low water consumption
- No chemical use
- Low maintenance and operating expenses