This biological hydrogen sulfide scrubber system provides a cost effective alternative to the iron sponge technology or other commercially available hydrogen sulfide scrubber system. Our biological scrubber is very efficient in treating very high concentration of hydrogen sulfide in biogas.  The biogas continuously passes through an insulated fiber glass tower containing fixed media inoculated with sulfur reducing bacteria.  Our system costs half the price of commercially available name brand systems available in the US market.  We provide a performance guarantee for our system.  Our system does not use any chemicals.  The system is completely automated and controlled by a PLC.  The operational cost of this unit is less than $1,000 a month.