Research Project Information

Research Project Summary Information

Biological H2S Scrubber (ST10375-1)

RCM International LLC


RCM International has developed an H2S removal system that uses an inert media supporting the growth of hydrogen sulfide oxidizing bacteria in a vessel through which biogas, mixed with a controlled amount of air, flows. The system is modular in design - sized to process 100cfm. A full-scale test unit has been in operation since October 2006 at a farm in California. H2S removal rates as high as 95% have been achieved using this test system. RCM believes that consistent H2S removal can be achieved through optimization of the air/biogas mixture.

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Project Description

The objective is to demonstrate 95% H2S removal on an annual basis. Four 100cfm H2S biological filter modules will be installed at Patterson Farms in Auburn, NY. Their operation will be optimized for H2S removal, and the modules will be monitored.


This could be a relatively low-cost solution for H2S removal. Metrics will be the measured percent reduction of H2S in the biogas, and the unit cost of removal.

Project Results

The H2S removal process was successfully demonstrated. An improved design was developed based on lessons learned in this project. The improved design is now commercially available.


RCM International LLC
Po Box 4716
Berkeley, CA 94704

Principle Investigator

Mark Moser

Universities Involved


Project Type:

Product Demonstration

Technologies Types:

Waste Management and Pollution Prevention
Water/Wastewater treatment systems

NYSERDA Contact Information

Edward Kear


R&D - Mfg Tech & On-Site Pwr

Contract Details

Start Date: 1/11/2010
Project Status: Active
Contract Number: ST10375-1

Last Updated: 4/16/2012