• The gas hydrogen sulfide from biogas production of a pig farm. In Amphoe ban na Nakhon nayok province by hydrogen sulfide gas, starting with a value in the range of 2500-4000 ppm. • Factors that the study is the start of a pH solution from Fe (III)-EDTA pH 6.5 – 9 is 4-up and initial concentrations of Fe (III) Fe (III)-aqueous solution EDTA 0.05 mol per liter from 0.03-3 concentration and duration of ozone blasting revive Fe (III)-aqueous solution EDTA after idle for 10 20 and 30 minutes, respectively.• Equipment used in gas, hydrogen sulfide removal and rehabilitation (III) Fe-EDTA is 900 ml Swing column liquid volume.• (III) to slurry Fe-EDTA is used by mol ratio constant 1:1.• The system must produce hydrogen sulfide gas, bio-gas that has not more than 100 ppm.• Testing of Fe (III) rehabilitation-EDTA of not less than 2 laps.
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