Biotechniques for air pollution abatement and odour control by A.J. Dragt, J. van Ham

By A.J. Dragt, J. van Ham

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Extra resources for Biotechniques for air pollution abatement and odour control policies: proceedings of an international symposium, Maastricht, the Netherlands, 27-29 October, 1991

Example text

FILTER MATERIAL 1 Aqueous phase "/ GAS EFFLUENT Biosaubbcr ADDITIVES Table 111: Distinctions between different biological waste gas purification systems. Biofilten reflect the easier mode of operation as compared to other biological purification systems. In a biofilter (Fig. 7) the W t e gas is forced to rise through a simple structured packed bed of materials. in which a suitable microbial population develops in course of time, or by inoculation of the material with suitable microbial strains.

13 a continuous refreshment of the liquid phase takes place, thus keeping the NaCI-concentration below inhibiting levels ( < 200 mM ). The gas flow is forced to rise through the bed co- or counter- Imu] Fig. 13: The influence of the NaCl concentration on the degradation rate of dichloromethane by Hyphomicrobium GJ21. currently to the liquid phase. g. g. glass, plastics, ceramics). On the surface of 27 these carriers the hiofilm is present, which generally develops naturally in course of time, after a trickling filter sysrem is inoculated.

As mentioned earlier, nowadays a clear trend exists to apply biofiltration on a much broader This problem can partly be solved by allowing the biological degradation to take place in the scrubber section, either by suspended biomass, or by immobilized biomass as done in a trickling scale in different branches of industry and the interest in this technique is rapidly increasing. 5 filter. Also another solution for this problem has recent- ly been presented. This concerns the addition of a high boiling organic solvent to the liquid phase (39,401.

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