Bioprocesses for the removal of volatile pollutants: present state of knowledge and future perspectives

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Different alternatives exist for the removal of odours and other volatile compounds from waste gases. On one side, non-biological processes can be used (mainly absorption, adsorption, and oxidation processes)

C. Kennes, H.N. Abubackar y M.C. Veiga
 La Coruña (UDC) University, Campus da Zapateira – Ingeniería Química, Rua da Fraga 10, E – 15008 – La Coruña, España. Tel.: 34-981-167000; Fax.: 34-981-167065; Kennes_at_ udc.es

Keywords: Bioreactor, biofilter, bioscrubber, trickling filter, odours, air diffusion bioreactor.

sesion4 kennes02Abstract

Different alternatives exist for the removal of odours and other volatile compounds from waste gases. On one side, non-biological processes can be used (mainly absorption, adsorption, and oxidation processes) and, on the other side, bioprocesses can be used.

The present study focuses on biological processes and presents the most important characteristics of the main technologies available on the market for the treatment of odours and the removal of volatiles pollutants from waste gases.

Alternative selection in odour treatment technologies: sustainability and economical sensitivity

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Selection criteria for odour abatement technologies have been traditionally economic and based on the flow rate to be treated, odour concentration (or of a certain surrogate such as H2S) and removal efficiency. However, nowadays social and environmental aspects are starting to gain importance

J. M. Estrada1, B. Kraakman2,3, G. Quijano1, R. Lebrero1, R. Muñoz1
1 Valladolid University, Department of Chemical Engineering and Environment Technology
2 CH2M HILL Australia
3 Delft University of Technology, Department of Biotechnology

Keywords: adsorption, biofiltration, chemical scrubber, environmental impact, odour abatement, operating costs.

 

sesion4 estrada01Abstract

Selection criteria for odour abatement technologies have been traditionally economic and based on the flow rate to be treated, odour concentration (or of a certain surrogate such as H2S) and removal efficiency. However, nowadays social and environmental aspects are starting to gain importance.

Odour abatement systems are designed to operate over long periods of time (20-30 years) and under dynamic scenarios and conditions. Therefore, an economic analysis of sensitivity of the operating costs towards different design and operational parameters is crucial.

This study summarizes the results from comparative sustainability analyses of the most applied technologies in the field of odour abatement: activated carbon adsorption, activated sludge diffusion, biofiltration, biotrickling filters, chemical scrubbers and hybrid systems (biotrickling filter + adsorption). Based on commodity prices and real market data provided by different manufacturers, the analysis revealed that technologies with low investment costs present high operating costs and are mainly physical/chemical technologies. Biological alternatives show lower operating costs and environmental impacts.

In terms of economic sensitivity, biological technologies show lower sensitivity towards design and operating parameters than their physical-chemical counterparts. The main drawback of physical-chemical technologies is their high sensitivity towards variations in the H2S concentration of odorous emissions due to their high chemicals and adsorption agents requirements. In economic and environmental terms, activated sludge diffusion and biotrickling filters stand out as the most promising technologies for a near future.

 

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Managing the impact of odour emissions from livestock activities

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Estel·la Pagans1, **, Rita Domíngues1, Anton Philip van Harreveld 1

1 Odournet SL. Crta Esglesia 60B. 08017 Barcelona.

* Contact author:

    Summary

   Odour emissions from intensive livestock activities are currently one of the biggest problems in areas with a high density of livestock compared with the human population density. At the same time, odour emissions make expanding these units of production difficult, and if they are to be maintained or even increased, it will be essential to reduce these emissions. In this context, it is essential to use the best available techniques (BAT), primarily to prevent and reduce the generation of odours through strategies integrated into the process, such as best practices and the drafting and implementation of an Odour Management Plan (OMP). In case of continued discomfort caused by odours, the application of end-of-pipe technology treatment will be necessary. This article presents the most common methodology to assess the impacts of odours from a livestock operation as well as the main strategies and treatment systems aimed at reducing odour emissions and their impact.

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