Combined biological and physicochemical waste-gas cleaning techniques
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Combined biological and physicochemical waste-gas cleaning techniquesDate
2012-06Citation
Rene ER, Veiga MC, Kennes C. Combined biological and physicochemical waste-gas cleaning techniques. Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering. 2012;47(7):920-39.
Abstract
This review presents a general overview of physical, chemical and biological waste-gas treatment techniques such as adsorption, absorption, oxidation and biodegradation, focusing more extensively on combined processes. It is widely recognized that biological waste-gas treatment devices such as biofilters and biotrickling filters can show high performance, often reaching removal efficiencies above 90 % for pollutant concentrations below 5 g/m3. However, for concentrations exceeding this limit and under transient shock-load conditions that are frequently encountered in industrial situations, a physicochemical gas cleaning process can sometimes be advantageously combined with a biological one. Besides improving the overall treatment efficiency, the non-biological, first-stage process could also serve as a load equalization system by reducing the pollutant load during periodic shock-loads, to levels that can easily be handled in the second-stage bioreactor. This article reviews the operational advantages of integrating different non-biological and biological processes, i.e., adsorption pre-treatment+bioreactor, bioreactor+adsorption post-treatment, absorption pre-treatment+bioreactor, UV pre-treatment+bioreactor, and bioreactor/bioreactor combinations, for waste-gas treatment, where different gas-phase pollutants have been tested.
Keywords
Waste-gas treatment
Volatile organic compounds
Two-stage reactors
Transient-state operations
Load equalization
Bioreactor performance
Volatile organic compounds
Two-stage reactors
Transient-state operations
Load equalization
Bioreactor performance
Editor version
Rights
This is an Accepted Manuscript of an article published by Taylor & Francis Group in Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances and Environmental Engineering on June 2012, available online at: http://www.tandfonline.com/10.1080/10934529.2012.667289