Environmental Engineering Reference
In-Depth Information
14
Biogas cleaning
ANNELI PETERSSON,
SP Technical Research Institute of Sweden, Sweden
DOI: 10.1533/9780857097415.3.329
Abstract: Biogas contains not only methane, carbon dioxide and water,
but may also contain other compounds in small amounts. These
impurities can affect the equipment for biogas utilisation, by causing
corrosion and mechanical wear, but may also lead to unwanted
emissions. Depending on how the biogas is going to be utilised it often
needs some form of cleaning to reduce the amount of unwanted
impurities. The effects that different impurities may cause when biogas is
utilised and technologies to reduce their concentrations are reviewed in
this chapter.
Key words: biogas composition, impurities in biogas, biogas cleaning.
14.1
Introduction
Biogas contains not only methane, carbon dioxide and water, but may also
contain other compounds in small amounts. Although the concentrations of
impurities are relatively low they can have a negative effect on utilisation of
biogas. The impurities can affect the equipment for biogas utilisation by
causing problems such as corrosion and mechanical wear. Impurities can
also lead to unwanted emissions when the biogas is combusted during
utilisation.
14.2 Biogas characterisation and quality standards
14.2.1 Biogas composition
The most common impurities in raw biogas are hydrogen sulphide,
ammonia, oxygen and nitrogen; which ones are found depends primarily
Search WWH ::
Custom Search