High-Performance Bioreactor for Anaerobe Applications

SULFATECH is an anaerobic gas scrubber used to sweeten sour gas in oil refineries and remove harmful sulfur emissions from gas in “waste to energy” projects fully biologically.

Advanced biological solutions for controlling sulfur emissions

Our performance-proven SULFATECH System offers a highly efficient and cost-effective alternative to historical methods of reducing sulfur emissions, able to eliminate over 99.5% of H2S and SO2. In contrast to amine treatment, thermal oxidation, or caustic scrubbing, AZZURO’s technology provides expanded capabilities for treatment of H2S, SO2, COS, CS2 and mercaptans while offering higher reliability and reduced maintenance, all at significantly lower installed cost.

Why Sulfatech

Aerobe bioreactor used to remove sulfur emissions


Removes over 99.5% H2S and other toxic sulfur compounds


Flow rates up to 20,000 cfm and H2S concentrations up to 20,000 ppm


An adaptive and self-regulating process that uses no chemicals and operates at ambient temperature and pressure


Consistent performance, few moving parts, extremely high reliability, and near zero maintenance


Modular design easily configurable for a wide range of applications

Cost Savings

Simple installation, minimal disruptions to operations, and reduced steam consumption allow CAPEX to be recovered in as little as 24 months


The anaerobic system keeps all gas free of oxygen, which is always undesirable and an explosion risk


No chemicals or annual media change-outs reduces your carbon footprint and creates no waste by-products


Forward-thinking design meets increasingly stringent government regulations on sulfur emissions

The Sulfatech Process

Patented Technology

First, SULFATECH absorbs H2S from Biogas or Sour Gas in an Anaerobic Chamber, which is then pumped into an Aerobic Biotrickling Filter that oxidizes the H2S into sulfuric acid (H2SO4).

The biogas flow always stays in the Anaerobic Zone, where a “Biological Slurry” washes it to absorb and dissolve the H2S. The Aerobic Biotrickling Unit drains 3-5% sulfuric acid, which is then brought back into the Biogas Washing Chamber (still containing the Biological Slurry), ready to scrub the H2S out of the methane (CH4) again.

To maintain the right sulfuric acid concentration and salt level, a small percentage of the flow is refreshed with potable water.

Finally, clean gas exits the unit, and the process starts again. Due to the anaerobic and acid environment, the biological reduction of methane is minimal to nothing.



Hydrocarbon recovery is best served with our bioreactor versus amine or caustic scrubbing—thanks to higher reliability, reduced maintenance and lower capital cost.

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Sour Gas

With microbiology at our core, we transform carefully cultivated bacteria into a giant ecosystem to treat polluted air and sour gas emissions.

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Sulfur Compounds

Expanded capabilities for treatment of H2S, SO2, COS, CS2 and mercaptans now come at a lower cost with less maintenance.

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Sulfatech Product Brochure


Oil & Gas Solutions Brochure


Sulfatech Process

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