Karbon partner logo

Industry related topics

Chemical-free H₂S removal

Chemical-free H₂S removal for biogas and industrial gas streams: the end of the scrubbing era

Stop managing chemical logistics and start engineering gas purity. For decades, the industrial gas and biogas sectors have accepted a toxic compromise: using caustic soda or amines to scrub hydrogen sulfide (H₂S). But what was once an industry standard has become a modern liability.

Gazpack has broken this cycle with the patented Sulaway system. By applying advanced thermocatalytic engineering, we have eliminated the need for chemical consumables entirely. We do not just remove H₂S from gas. We transform it from a hazardous waste stream into a commercial-grade asset.

The hidden burden of the chemical standard

Traditional chemical scrubbers, such as amine or caustic wash, are often sold as a proven solution. However, their true cost is hidden in the operational tail. For a mid-sized plant, the chemical standard creates a complex chain of logistical, regulatory, and safety risks.

  • The logistical footprint: For a 500 Nm³/h plant with 2,000 ppm H₂S, a chemical system requires between 12 and 24 truck deliveries of fresh chemicals per year. Because the resulting effluent is often 5 to 10 times larger in volume, this leads to 50 to 100 truck movements annually just to manage waste.
  • The disposal trap: Disposing of toxic chemical waste is a major OPEX driver. Costs for removing hazardous liquid effluent can reach up to $500 per ton.
  • The safety risk: Amine absorbers are a known source of high incident frequencies. Industry data shows that over 40% of incidents in gas treatment are related to leaks, corrosion, and the inherent danger of handling caustic substances like sodium hydroxide (NaOH).

The Sulaway breakthrough: converting waste into value

Our approach is rooted in the principle that waste is a design flaw. The Sulaway system uses a patented process to adsorb H₂S and then thermally regenerate the media in a closed-loop system. This is a purely mechanical, thermocatalytic process designed for high-load gas streams, ensuring consistent <1 ppm purity regardless of environmental conditions or feedstock fluctuations.

The most disruptive element of this technology is the reformer unit. Instead of producing toxic liquid waste that you pay to remove, our process chemically converts H₂S into 40% industrial-grade sulfuric acid (H₂SO₄). This transforms a $500 per ton disposal cost into a revenue stream or a valuable input for other industrial processes.

Future-proofing against RED III and IED regulations

The regulatory landscape is shifting rapidly. The new EU RED III directive requires strict traceability of the carbon footprint across the entire value chain, including the production and transport of chemicals used in purification.

By eliminating chemicals, Gazpack gives operators a significant advantage in their carbon intensity (CI) score. Furthermore, the Industrial Emissions Directive (IED) is increasingly forcing the phase-out of toxic waste-generating processes in favor of best available techniques (BAT). Sulaway is designed to meet these standards today, ensuring your plant remains compliant and profitable for the next 20 years.

Industry-specific impact: a solution for every sector

Engineering firms (EPCM) Simplify your site permitting and HSE planning. A chemical-free system reduces the complexity of environmental permits and eliminates the need for hazardous chemical storage in your design, accelerating the project timeline.

Renewable gas plants (RNG and bio-LNG) Achieve the ultra-purity required for cryogenic liquefaction (<1 ppm H₂S) without the rising cost of consumables. Our system ensures that every truck movement is for your product, not for chemical waste.

Farmers (dairy, pig, poultry) Transform manure-to-energy into a safe, hands-off revenue stream. Stop managing the logistics of caustic soda on the farm and focus on energy production with a robust, mechanical solution.

Landfill and waste management Handle high-flow, high-H₂S gas with a system that does not scale in logistical complexity. Sulaway handles the shock loads of landfill gas without an exponential rise in chemical costs.

Food and beverage manufacturers Ensure site safety and ESG compliance by eliminating toxic liquid effluents. Purify your biogas for on-site heat and power without introducing hazardous chemical supply chains to your production facility.

Oil and gas (upstream and midstream) Deploy offshore-grade robustness for the most demanding sour gas environments. Our technology originated in the harshest oil and gas conditions, providing a chemical-free alternative where safety and uptime are critical.

Strategic comparison: Gazpack vs. traditional scrubbers

FeatureTraditional chemical scrubbersGazpack Sulaway
Chemical consumptionHigh (caustic/amine)Zero
Logistical movements50 - 100 trucks / yearMinimal (byproduct only)
Waste productToxic liquid effluent40% Sulfuric acid (asset)
HSE requirementsHigh (chemical handling/PPE)Standard industrial safety
RED III / ESG impactHigh (chemical footprint)Minimal (circular process)

Data-driven FAQs

Take control of your gas purity

Do not let chemical logistics dictate your operational efficiency. Our engineers are ready to help you transition to a cleaner, safer, and more profitable purification strategy.

  • Request a TCO comparison: Send us your current gas flow (Nm³/h) and H₂S load to see the financial impact of going chemical-free.
  • Engineering consultation: Discuss your site-specific integration challenges with our technical team.
  • Sustainability audit: Learn how eliminating chemicals can boost the value of your RNG certificates.

Talk to a specialist

Ready to eliminate chemicals from your H₂S removal?

Get in touch