BioDeNOx process

Reactor Engineering Studies on the BiodeNOx absorption process... 

The BiodeNOx process is a novel process concept to reduce NO emissions from flue gases of stationary sources like power plants and other industrial activities [1]. The concept combines a wet chemicd absorption process with a novel biotechnological regeneration method. In the wet chemical absorption step, flue gas components are absorbed into an aqueous solution of Fe"(EDTA) (EDTA= ethylme-diamino-tetraacetic acid). The following reactions take place ... 

The biochemical processes of denitrification and Fe(III) reduction have been experimentally investigated in a batch reactor [5]. The feasibility of the integrated absorption-bioreaction process was demonstrated on a laboratory-scale setup [6], Figure 12.1 presents the principle of a biochemical process for NO removal (BioDeNOx). 

In this case study we will model, simulate and design an industrial-scale BioDeNOx process. Rigorous rate-based models of the absorption and reaction units will be presented, taking into account the kinetics of chemical and biochemical reactions, as well as the rate of gas-liquid mass transfer. After transformation in dimensionless form, the mathematical model will be solved numerically. Because of the steep profiles around the gas/liquid interface and of the relatively large number of chemical species involved, the numerical solution is computationally expensive. For this reason we will derive a simplified model, which will be used to size the units. Critical design and operating parameters will be identified... 

Figure 12.4 Performance of the BioDeNOx process as a function of the absorber size, for different values of the interfacial area.

Figure 12.8 Flowsheet and process control of the BioDeNOx process. 

Characterization of microbial communities removing nitrogen oxides from flue gas the BioDeNOx process,... 

To avoid any additional pollution by the oxidation products and to ensure the low cost of the process, the BiodeNOx procedure was proposed, which is a novel technique for NO removal from industrial flue gases. In principle BioDeNOx is based on NO absorption into an aqueous [Fe (edta)(H20)] solution (Eq. 14) followed by NO reduction and [Fe (edta)] regeneration by the denitrifying bacteria ... 

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