Natural Iron Oxyhydroxide for H2S Removal

By Promindsa

Introduction

Biogas must be purified as a previous stage to be used in cogeneration engines, boilers, or grid injection. One of the most problematic polluting agents, both for processes and equipment, is hydrogen sulfide (H2S). The product MICRONOX BIOX ON16 sharply reduces the H2S levels inside anaerobic digesters before the upgrading stage.

Product Utilisation

MICRONOX BIOX ON16 fits perfectly into the values of ecology and circular economy due to its natural origin, and it is manufactured only by mechanical processes with 100% renewable energy. Its neutral pH, structure, composition, and zero toxicity eliminate the risk of handling corrosive substances, prevent the metal structures and piping from corrosion, and mitigate the odour impact. Its high surface area (particle size <2µm) and high affinity for hydrogen sulfide make the product capable of reducing the concentration of H2S from 2,000-10,000 to 100-200 ppm. Furthermore, the resulting product of the H2S removal is an inert mixture of Fe2S3 and S (elemental), which becomes part of the digestate and could be applied to the soil as a fertilizer. This means the product begins and ends on land, providing solutions to key environmental problems such as SO2 emissions to the atmosphere and intensive use of inorganic fertilizers.

Company Uniqueness

PROMINDSA extracts, processes and exports their own products, from the mine extraction to customer delivery. PROMINDSA started as a mining company with the goal of pigments commercialisation. Along the years, it extended its activity to biogas desulphurisation with new products.

The know-how of mineral processing employed in pigments is applied to biogas desulphurization products. The expertise includes experience in international markets, which is applied in sales, exportation, and customer service.

During 2024, PROMINDSA supplied 17,000 tonnes of material (2,200 in Asia). PROMINDSA’s current experience in Asia with biogas includes companies in the UAE.

Project Uniqueness

High-performance and cost-efficiency product for H2S removal inside anaerobic digesters.
Natural iron oxide source (product extracted, processed and exported by PROMINDSA).
By-products used as fertiliser.
Low carbon footprint: 100% Renewable electricity during production (RE Certificate) (25,49 kg CO2 / tonne ON16).

For more information, read our Asia Biogas Magazine.