Simultaneous degradation of a mixture of solvents in a biological trickling filter: Dichloromethane and methylmethacrylate
- Eindhoven Univ. of Technology (Netherlands). Faculty of Chemical Engineering and Chemistry
An artificial waste gas containing dichloromethane (DCM), the target compound, and methylmethacrylate (MMA) was treated in a biological trickling filter (BTF). This type of waste gas is encountered in the plastic and coating industry. After an initial five months period at a constant DCM load of 80 g/(m{sup 3} {center_dot} h) MMA was added to the waste gas and its influence upon the DCM degradation was studied. Three different MMA loads were applied: 10, 20 and 30 g/(m{sup 3} {center_dot} h). The DCM elimination over the filter decreased at an increasing MMA load, but in all filters it reached a stable but lower level than before MMA addition. Clogging was observed at all three MMA concentrations applied. It has been speculated by what mechanistic effects the changes in the biofilm performance is brought about. Batch experiments with biofilm material taken from the BTF and short term BTF experiments were carried out to characterize the MMA degradation in the BTF`s. They showed that the first step in the MMA degradation is a rapid hydrolyzation into methanol and methacrylic acid (MCA). During normal operation the hydrolyzation intermediates are completely degraded in the BTF. A sudden increase in the MMA load, however, caused the accumulation of the intermediate methacrylic acid (MCA) in the liquid phase. Investigations of the MMA degradation of the liquid phase showed that the bulk of the MMA hydrolyzation occurred by biomass suspended in the liquid phase, instead of in the biofilm. This in contrast to the DCM degradation that was concentrated in the biofilm.
- OSTI ID:
- 351076
- Report Number(s):
- CONF-970677-; TRN: IM9925%%238
- Resource Relation:
- Conference: 90. annual meeting and exhibition of the Air and Waste Management Association, Toronto (Canada), 8-13 Jun 1997; Other Information: PBD: 1997; Related Information: Is Part Of 1997 proceedings of the Air and Waste Management Association`s 90. annual meeting and exhibition; PB: [7000] p.
- Country of Publication:
- United States
- Language:
- English
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