SULFA-BIND®

ADI introduces a new hydrogen sulfide gas stripping process.

ADI has developed a new process for removing hydrogen sulfide (H2S) from gas streams. Hydrogen sulfide is a common component in wastewater treatment plant off-gases (e.g. biogas) and waste gases from certain industrial processes. It is highly toxic and odorous, therefore its release to the atmosphere is regulated.  Hydrogen sulfide is highly corrosive, which can result in costly damage to equipment and piping systems used in biogas handling.

The simplest means of dealing with H2S is to burn the biogas in a flare. Unfortunately, this achieves 95% conversion to non-odorous sulfur dioxide (SO2), which typically is not sufficient to meet stringent air quality requirements.

Research completed by ADI has determined our patented SULFA-BIND® process will efficiently and cost effectively remove H2S from biogas. A bench-scale version of a SULFA-BIND® filter was able to treat gas with an H2S concentration as high as 30,000 ppm, reducing it to less than 1 ppm. An on-site pilot-scale filter was able to reduce H2S from 60 - 100 ppm down to less than 0.2 ppm on a digester gas at a wastewater treatment plant.

H2S-saturated SULFA-BIND® was also subjected to leachate testing, using both the Canadian and US protocols with the results considered non-hazardous waste.

Based on the performance evaluation and economic comparison with existing technologies, H2S removal using SULFA-BIND® filter media is a practical, viable option.

Why Remove Hydrogen Sulfide?

Hydrogen sulfide can be present in various air/gas streams particularly those associated with anaerobic digesters, sewage treatment plants and pulp and paper mills. It is highly toxic, has an unpleasant odor, and is corrosive to equipment and piping systems. Its release to the atmosphere is strictly regulated.

What is SULFA-BIND®?

SULFA-BIND® consists of an inorganic, natural material, calcined to increase hardness, porosity and surface area and coated with iron oxide. Used in fixed-bed adsorber vessels, pressure loss is very low (inches of w.c.).

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