Method for biologically removing sulfureted hydrogen from marsh gas

The invention discloses a method for biologically removing sulfureted hydrogen from a marsh gas, which comprises the following steps: (1) introducing the marsh gas from an air inlet of a filling spray absorber; (2) removing the H2S from the marsh gas by filling and reacting the marsh gas with spray liquid, wherein the spray liquid is a solution containing NaOH and Na2CO3; (3) discharging the purified marsh gas and the spray liquid absorbing the H2S from the absorber; (4) delivering a part of the spray liquid discharged from the absorber back to the absorber for circulated spray, adding a nutrient fluid into the other part of the spray liquid and then delivering the other part of the spray liquid into a biological filtration tower, wherein the nutrient fluid contains a nitrogen source and a phosphorus source; (5) spraying the mixed solution of the spray liquid and the nutrient fluid delivered to the biological filtration tower onto a biological filter material, introducing air from the air inlet of the biologi