Abstract
Biogas from anaerobic digestion of biological wastes is a renewable energy resource. H2S in biogas may cause corrosion or other damage to engines if it is not removed from the gas before utilization. Because the solubility of H2S in water is higher than methane, water can be used as an adsorbent to remove H2S from biogas. A simple water scrubbing column to reduce the H2S content was designed in this study. The biogas purification process took place in the scrubbing column with water where the gas was continuously fed from the bottom of the column through the diffuser which could produce bubbles. The biogas bubbles and the water can accelerate the reaction inside the column. The water in the column was circulated by means of a pump. H2S content in raw biogas was about 6000 ppm. First, the efficiencies of H2S removal for different biogas flow rate and water level were conducted at 30 and 90 sec. Second, the efficiencies of H2S removal with water recycling system were induced. The results showed that the concentration of H2S in biogas decreased significantly with water level and increased with biogas flow rate through the water scrubbing. It was an effective technique for removing H2S in a short operation time, but absorption capability of water declined rapidly with time. To maintain high absorption rate, water scrubbing after adsorption needed to be replaced or regenerated. The water scrubbing system is a simplest and cheapest method. This work is investigated the feasibility of water scrubbing system and its application to a small hog farm.
Highlights
Biogas is produced by the anaerobic digestion or fermentation of biodegradable materials such as biomass, manure, sewage, municipal waste and plant materials
The results of removal efficiency of H2S content for biogas in different water level with biogas flow rate 140 l/min after water scrubbing 30 sec and 90 sec were shown as Table 1and Table 2 which was clearly indicated
That the removal efficiency of H2S content for biogas was increased with the height of the water level at water scrubbing time of 30 sec and 90 sec
Summary
Biogas is produced by the anaerobic digestion or fermentation of biodegradable materials such as biomass, manure, sewage, municipal waste and plant materials. Biogas is a renewable energy source and can replace fossil fuel. Anaerobic digestion is often the only possibility of producing biogas from manure. Anaerobic digestion is a microbiological process during which organic matter is decomposed into biogas and microbial biomass in the absence of air. There has been growing interest in biogas which is bio-energy source resulting. How to cite this paper: Lien, C.-C., Lin, J.-L. and Ting ,C.-H. (2014) Water Scrubbing for Removal of Hydrogen Sulfide (H2S) Inbiogas from Hog Farms. Journal of Agricultural Chemistry and Environment, 3, 1-6.
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