Pressure water scrubbing technology has become one of the key technologies of biogas purification. This paper adopted a packed absorption column to study on carbon dioxide removal. The influences of absorption pressure

absorption temperature

carbon dioxide content on the product gas and height of packing layer on carbon dioxide removal rate as well as those of liquid/gas ratio and biogas flow on volumetric overall absorption coefficient were investigated. At the same time

the intensive tests used a two-stage absorption column combined with a packed column and a spray column for purification process of pressure water. It was shown from the results that the increased absorption pressure

liquid-gas ratio and height of packing layer and reduced absorption temperature were favorable of removing carbon dioxide. Besides

volumetric overall absorption coefficient rose with increasing liquid/gas ratio and biogas flow. Two-stage absorption column was able to improve the effect of carbon dioxide absorption. When the biogas flow was 10 L·min-1

the height of packing layer 100 cm and carbon dioxide content less than 3%

about 12% of the amount of absorption liquid can be reduced by two-stage absorption column compared with the traditional packed tower. Furthermore

when the two-stage absorption column of 110 cm was used

the optimum purification effect can be obtained and the carbon dioxide removal rate can reach 97.4%.