Development of biogas scrubber prototype by using neutral solution
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Abstract
One of the most important problems for electrical production from the biogas by using vinasse as a reactant is a hydrogen sulfide gas (H2S). This gas is one of many products from microbial metabolism. It is the corrosive substance that causes damage in metal composite parts of the machine and the human respiratory system. The aim of biogas scrubber development was to reduce the hazard gas before pass through the biogas generator. The principle of the scrubber prototype was designed as a spray tower. The droplet (pH adjusted water) was moved from the top to the bottom by gravity and solution pressure while H2S was injected from the bottom of the prototype scrubber. The counter-current flow was occurred. The results indicated that the elimination efficiency was enhanced by packing material in the scrubber. The high acidity of drained wastewater had run out of scrubber bottom. After that, the waste solution was passed through the pH adjustment system (pH 7.0+0.2) and the solution was returned to the gas scrubber in order to generate the recovery solution. The optimum flow rate of pH adjusted solution was 200 mL/min and the inlet gas flow rate was 50 mL/min. With the prototype scrubber, the concentration of H2S was tested in the range of 15,600+1,300 mg/L. The obtained concentration of hydrogen sulfide was lower than 50%.
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Published manuscript are the rights of their original owners and RMUTSB Academic Journal. The manuscript content belongs to the authors' idea, it is not the opinion of the journal's committee and not the responsibility of Rajamangala University of Technology Suvarnabhumi
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