Bio Gas Purification Process

1. Purification(Zeolite)
 

Zeolite is a non-toxic, three-dimensionally porous, crystalline, hydrated alumina-silicate with natural adsorbent and ion exchange properties, which removes harmful microbes as well as dispersed insoluble and soluble toxins from bio gas. In zeolite Purification adsorbed gases and soluble impurities which may compete with H2S and CO2 are removed.

2.   Water Scrubbing  
 

Carbon dioxide has a higher solubility in water than methane. Carbon dioxide will therefore be dissolved to a higher extent than methane, particularly at lower temperatures. In the scrubber column carbon dioxide is dissolved in the water, while the methane concentration in the gas phase increases. The gas leaving the scrubber has therefore an increased concentration of methane.  

There are technologies available through which 97% purity of methane can be achieved with minimal (<5%) methane loss.