Many industries have wastewater treatment pond to pond to the biogas fermentation of biogas used as fuel in steam boiler. But the problem is often caused by hydrogen sulfide gas volume in biogas high. (> 0.5% vol) (Department of industrial, 2553) Specifically, the factories that have polluted water with high BOD and sulphur compounds are used in the manufacturing process, such as fruit processing industry is Dihydrogen sulfide in gas, biogas will make reducing the heat of fuel, machinery or equipment, with the opportunity of high corrosion resistance occurs due to hydrogen gas.The combination with sulfide vapor compounds sulfur dioxide occurs with vitamin a acid. In addition, the burning of biogas to hydrogen sulfide gas emissions as sulphur dioxide released into the atmosphere and. In addition to the toxic gas that is one of the causes of ozone layer hole (Ozone Depletion) into the atmosphere, hydrogen sulfide gas removal, therefore, it is important to allow the use of biogas. Removal of hydrogen sulfide in the gas by biogas slurry with Fe (III)-EDTA is a process that relies on the reaction between Fe (III)-aqueous solution with hydrogen sulfide gas, EDTA (M. Sun, 2013) and rehabilitation Fe (II) aqueous solution by Fe to change the spit into the equation (III) (1-1), and (1-2), respectively.
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