ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 04  NO. 02 APRIL 2016:

Title:       Chemical Scrubbing for removal of CO2 from Biogas using Algae and H2S using Sponge Iron
Authors:    L. Mohanakrishnan, Kurian Joseph
Abstract:   Biogas, a byproduct of anaerobic decomposition of organic wastes, contains 50–70% methane,30–50% carbon dioxide, traces of hydrogen sulphide, fractions of water vapour and other gases. Purification of biogas involves the removal of CO2, H2S and water vapour from the biogas to overcome the problems like low energy density, corrosion in engines, pipelines and storage cylinders, reduced heating value, energy losses,GHG emissions etc., which hinders its potential to be used as fuel. A Pilot level Biogas purification unit by Chemical scrubbing method was established to desulphurise, decarbonise and dehydrate biogas. When biogas with H2S concentration of 27 ppm was passed through Sponge Iron bed depth of 100 mm, 300 mm and 500 mm, the H2S concentration decreased to 12 ppm, 9.93 ppm and 8 ppm respectively with 70 % removal of H2S achieved at a Sponge Iron bed depth of 500 mm.99.98 % arbon dioxide removal was achieved at the Na2CO3 flow rate of 800 LPH. Scenedesmus obliquus is found to be efficient in the capture of CO2. The carbonate regeneration and bicarbonate degeneration was observed to be 8.03 % at the end of three days of algal treatment of Sodium bicarbonate effluent from the CO2
scrubber of the purification unit. The CO2 removal efficiency of Water scrubbing method was found to be 30%.Whereas, an efficiency of 99.98 % was achieved with the help of counter-current Chemical scrubbing method.

Keywords:  Biogas Purification, Enrichment, Chemical Scrubbing, Sponge Iron, Algal Culture,Decarbonisation, Desulphurisation, Bio fuel
Pages:            35-41

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