Biogas Desulfurization Solution

Biogas Desulfurization Solution — Complexing Agent & Catalyst for Regenerative Wet H₂S Scrubbing Systems

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High-performance biogas desulfurization liquid — iron chelate complexing agent & regeneration catalyst for wet scrubbing. For large-scale biogas & RNG plants. Factory direct B2B supply.

Product Overview

Our biogas desulfurization solution is a two-component liquid system — a Complexing Agent and an Oxidation Catalyst — engineered for continuous wet scrubbing of hydrogen sulfide from biogas. Together, they deliver superior H₂S removal performance for large-scale biogas plants, biomethane upgrading facilities, and landfill gas operations where dry media systems may not be economical or practical.

Component A — Complexing Agent (Iron Chelate Solution)

The complexing agent is an aqueous iron chelate solution that serves as the primary H₂S absorber in the scrubbing loop. In the scrubber tower, gaseous H₂S contacts the circulating liquid and reacts with chelated ferric iron (Fe³⁺), which oxidizes the sulfide to elemental sulfur while the iron is reduced to Fe²⁺. The chelate ligand keeps iron in solution across the working pH range (7–9.5), preventing precipitation and ensuring continuous, uninterrupted absorption capacity.

Key features: high iron loading, stable performance across pH 7–9.5, compatibility with packed towers, spray towers, and venturi scrubbers, and minimal foaming.

Component B — Catalyst (Oxidation Catalyst Solution)

The catalyst is added in small quantities to the scrubbing solution to accelerate the re-oxidation of reduced iron (Fe²⁺ → Fe³⁺) using dissolved oxygen from air injection into the oxidation tank. This regeneration step is the heart of a closed-loop, continuous system.

Without effective catalysis, air oxidation of Fe²⁺ is slow, requires excessive aeration, and leads to rapid degradation of the chelate ligand — significantly increasing operating costs. Our proprietary catalyst accelerates the oxidation reaction by 3–5×, dramatically reducing air consumption, extending solution life, and improving overall system economics. Dosing rate is low (0.5–2.0% v/v), making it cost-effective even for large circulating volumes.

Product Specifications

Complexing Agent Specifications

Appearance

Dark amber liquid, clear to slightly turbid

Active Component

Iron (III) chelate complex, Fe³⁺ ≥3.5% w/v

pH (as supplied)

8.0 – 9.0

Working pH Range

7.0 – 9.5

Operating Temperature

5°C – 55°C

Density

1.10 – 1.15 g/mL

H₂S Removal Efficiency

≥95% removal at designed L/G ratio

Packaging

200 L drums; 1,000 L IBC totes; bulk tank

Catalyst Specifications

Appearance

Light yellow to amber liquid

Active Component

Proprietary organic oxidation catalyst, ≥15% active

pH (as supplied)

6.5 – 7.5

Dosage Rate

0.5 – 2.0% v/v of circulating solution volume

Re-oxidation Enhancement

Fe²⁺ → Fe³⁺ conversion rate: 3–5× faster vs. uncatalyzed

Packaging

25 L jerricans; 200 L drums

Application Scenarios

Large Biogas Plants

Continuous flow wet scrubbers at industrial digesters processing >5,000 m³/day biogas️

Biomethane / RNG Upgrading

First-stage H₂S removal before membrane or PSA upgrading to pipeline-quality gas️

Municipal Wastewater Plants

High-H₂S sludge digester gas where dry media replacement is logistically challenging

Industrial Process Biogas

Breweries, paper mills, chemical plants with organic effluent anaerobic treatment

Fuel Cell & Micro-turbine Feed

Ultra-low H₂S specification (<1 ppm) applications demanding polishing-grade removal

Carbon Credit & ESG Projects

Biogas upgrading under Verra, Gold Standard, or national RNG certification programs

Related Products

Solid

Biogas Desulfurization Agent (Dry Media)

Iron oxide granular media for dry bed H₂S removal; ideal for small-to-medium biogas systems and as polishing stage

System

Wet Scrubber Towers & Oxidation Tanks

Packed column scrubbers and aeration tanks engineered for iron chelate liquid desulfurization systems

Service

Solution Analysis & Optimization Service

Laboratory analysis of used solutions with dosing optimization recommendations to extend solution life