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What is biofiltration?


Biofiltration is a highly effective biological process for treating a wide range of contaminants in air or wastewater streams. ProCycla specializes in designing energy-efficient and low-maintenance biofiltration systems for the treatment of biogas.

Biogas biofiltration uses specially selected bacteria to remove impurities such as dust, sludge, water droplets, carbon dioxide, and ammonia from biogas. ProCycla offers three types of biofiltration equipment: fixed bed biofilters, biowashers, and biofilter trickling filters.

Biofilters for biogas

Biogas typically contains dust, sludge, small water droplets, carbon dioxide (CO2), ammonia, hydrogen sulfide (H2S) and traces of other gaseous compounds. The specific use to which the biogas will be put determines the level of purification required, so pre-use treatments are needed to remove impurities. One of the technologies used to purify it is biofiltration.

Biogas biofiltration consists of previously selected species of bacteria that are inoculated into the biofilter and degrade or transform compounds such as hydrogen sulfide into sulfur.

The equipment used for biological gas purification can be divided into three types:

1. Fixed bed biofilter

Fixed bed biofilters consist of a biological filter filled with organic support (peat, compost, or soil) suitable for treating contaminants with low water solubility.

The gas is fed through the bed, and the pollutants are absorbed in the formed liquid film, which is degraded by the biomass.

2. Biowashers

Biowashers absorb pollutants in water-filled absorption towers, making them ideal for contaminants highly soluble in water.
Unlike biofilters, in scrubbers, the pollutant is first absorbed in water in a liquid-filled absorption tower.

The operation consists of flowing the gas countercurrent through the water. Subsequently, in the second phase, the liquid stream is treated in a reactor packed in a material covered with the microorganisms responsible for the degradation.

3. Biofilter trickling filters

Biofilter trickling filters use a single column filled with synthetic support (usually ceramic or plastic material) and are a versatile and cost-effective solution as they can adsorb and biodegrade pollutants in the same equipment.

The gas stream containing the pollutant to be removed is introduced through the bed. A liquid stream circulates through the upper part, which provides nutrients to the microbes, maintains humidity and pH conditions, and eliminates the products degraded by the microorganisms.

ProCycla's biofiltration systems for biogas treatment are designed to have low energy consumption and maintenance costs. The use of biofiltration not only helps remove contaminants from biogas but also contributes to reducing environmental pollution, making it a sustainable solution.

Contact ProCycla to learn more about our biofiltration systems and how they can help your business.