Extremely acidophilic sulfur-oxidizing bacteria applied in biotechnological processes for gas purification

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Indoor CO2 direct air capture and utilization: Key strategies towards carbon neutrality

Direct air capture (DAC) is a promising technology that can help to remove carbon dioxide (CO2) from the air. One application of DAC is indoor CO2 direct air capture (iCO2-DAC). A wide range of materials with unique properties for CO2 capture have been investigated, including porous materials, zeolites, and metal-organic frameworks. The selection of suitable materials for iCO2-DAC depends on several factors, such as cost, CO2 adsorption capacity, and stability. The development of new materials with improved properties for iCO2-DAC is an active research area. The captured CO2 can serve as a renewable carbon source to produce biofuels for internal use (e.g., for heating purposes), decreasing the environmental impact of buildings. This review article highlights the importance of iCO2-DAC to improve indoor air quality in buildings and boost the circular economy. We discuss the available carbon capture technologies and materials, discussing their properties and focusing on those potentially applicable to indoor environments. We also provide a hypothetic scenario where CO2 is captured from different indoor environments and transformed into sustainable fuels by using an emerging carbon capture and utilization technology (microbial electrosynthesis). Finally, we evaluate the economic feasibility of such an innovative approach in comparison to the use of traditional, fossil-based fuels

Biological technologies for the treatment of atmospheric pollutants

International audienceMost industrial activities emit atmospheric pollutants nowadays. Many of these activities are performed in stationary hotspots such as chemical industry facilities, wastewater and solid waste treatment plants. Other important stationary sources of gas pollutants include facilities for mining, intensive livestock farming and rendering. Volatile organic compounds (VOCs), odours and greenhouse gases are released from the above-mentioned sources, leading to issues related to global warming, health disorders and complaints to public administrations due to odour annoyance. When the release of atmospheric pollutants cannot be prevented, the sort of pollutants, their concentration and the flow rate of the waste gas emission must be characterised in order to select the most cost-effective treatment technology. Over the last decades, the use of biological technologies for the treatment of atmospheric pollutants has gradually increased due to their proven robustness, high cost-effectiveness and low environmental impact. The fundamentals of the most commonly implemented biological technologies in industrial applications (biofiltration, biotrickling filtration, bioscrubbing and activated sludge diffusion) are described in this work. The latest findings in the field of biological technologies for air pollution control are also presented and discussed