REMOVAL OF H2S FROM BIOGAS USING SOYBEAN-BASED INK WASTE FROM PRINTING INDUSTRIES AS AN ADSORBENT

Natthakan  Thanakunpaisit; Usa  Onthong; Niramol  Juntarachat

Authors

Natthakan Thanakunpaisit Department of Chemistry, Faculty of Science, Thaksin University, Phattalung campus, Phattalung 93210 Thailand.
Usa Onthong Department of Chemistry, Faculty of Science, Thaksin University, Phattalung campus, Phattalung 93210 Thailand.
Niramol Juntarachat Department of Chemistry, Faculty of Science, Thaksin University, Phattalung campus, Phattalung 93210 Thailand.

Keywords:

Soybean-based ink waste, adsorbent, biogas, hydrogen sulfide

Abstract

In this study, the adsorption capacity of soybean-based ink waste adsorbent to remove H2S from biogas was studied. First, the physical and chemical properties of the soybean-based ink waste adsorbent were determined. The moisture contents and iodine numbers at different pellet sizes varied from 5%-9% and 956.00-1237.00 mg/g, respectively. The high adsorption efficiency could be provided by its high iodine number but it could be reduced by its middle moisture content. Secondly, the effect of the pellet size and initial H2S concentration on the adsorption capacity was investigated. Breakthrough curves for different pellet sizes showed that soybean-based ink waste adsorbent presented a high adsorption capacity for H2S but very low adsorption capacity for CH4 and CO2. The smaller pellet sizes’ adsorbent showed a higher removal efficiency than the largest pellet size owing to its larger surface area. Moreover, the breakthrough capacity for the initial H2S concentration of 1,040 ppm and 9,982 ppm was estimated to be 18.42 mg/g and 28.44 mg/g, respectively. A higher initial H2S concentration resulted in the higher breakthrough adsorption capacity. Finally, the SEM/EDX results showed significant changes in the morphological and chemical properties after the adsorption process. Therefore, soybean-based ink waste material could be used as a good alternative adsorbent for removing H2S from biogas.

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