Anaerobic degradation of formaldehyde in sequencing batch reactor containing immobilized biomass / Degradação anaeróbia de formaldeído em reator operado em bateladas seqüênciais contendo biomassa imobilizada

AUTOR(ES)

Noemi da Silveira Pereira

DATA DE PUBLICAÇÃO

2007

RESUMO

Formaldehyde residues are discharged into the environment in several different ways, as a result of several industrial processes, as well as its use as a preservative. Research for suitable technologies for treatment of formaldehyde points to physical-chemical and biological processes, with special attention to anaerobic processes, once they represent compact systems with low energy requirements. Nevertheless, some blank spaces still remaining in the research regarding anaerobic treatment of formaldehyde must be filled, and some points of disagreement must be clarified. In several cases, formaldehyde residues are discharged intermittently, favoring the choice of batch processes. In this context, the present study evaluated the degradation of formaldehyde in an anaerobic sequencing batch reactor, containing biomass immobilized in polyurethane foam matrices. Reactor performance was monitored for different influent formaldehyde concentrations, ranging from 31.6 to 1104.4 mg/L. Results obtained indicate excellent reactor stability and efficiency in formaldehyde removal above 99%. However, accumulation of organic matter was observed in the effluent, due to presence of non-degraded organic acids, especially acetic and propionic. This observation poses an important question regarding the anaerobic route of formaldehyde degradation, which might differ substantially from that reported in literature. The degradation of the generated products could occur in another reactor in serie containing biomass adapted to organic acids removal.

ASSUNTO(S)

degradação anaeróbia formaldehyde bateladas seqüênciais formaldeído anaerobic degradation biomassa imobilizada sequencing batch immobilized biomass

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