Cryptogamic Packed Biofilter as Potential Adsorbent for CO₂, NH₃, and H₂S Impurities from Biogas

Table 3

Soil-type performance in biogas purification (RE) average over an operating time of 2.5 hrs ( ml/min).

Gas analyzed	Initial concentration ()	RE (%), average over time 2.5 hrs
		T1	T2	T3	T4
CO2	36.4–40.0%	36.0	42.0	76.1	75.1
NH3	7-13 ppm	56.3	nd	71.4	56.4
H2S	498-836 ppm	83.5	84.0	93.3	97.1

nd: not determined.