Processing of Steel Chips Waste for Regenerative type of Biogas Desulfurizer

Abstract

Abstract- In this research regenerative type of biogas desulfurizer by utilizing waste steel chips is introduced. The waste of steel chips was obtained  form metal forming process of turning. The annealing process was conducted on steel chips prior compacting to yield a billet. The purpose of annealing was to eliminate the residual stress as well as to let the oxidation to occur in order to obtain iron oxide. As residual stress eliminated, the steel chips was possible for compacting as a billet. The annealing process was carried out by burning the steel chip at 900oC. During the annealing process the steel will react with oxygen to form iron oxide (Fe2O3) and if during oxidation there is a water vapor in the air then the iron bog ore (Fe(OH)3)will be formed. Both  Fe2O3 and Fe(OH)3 are reactive to H2S and therefore able to eliminate the H2S contaminant inside the biogas. The result from the process of desulfurization was precipitation of sulfur (S) in the form of Fe2S3 in the surface of steel chips which will reduce the performance of desulfurizer. The affectivity of desulfurizer then is recover by reacting the Fe2S3 in the same time with O2 and H2O, therefore the desulfurizer can be used again (regenerative used).

Keywords

• hydrogen sulfide; desulfurizer; regenerative; waste; steel chips; biogas

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