Modelling the growth of methane-oxidizing bacteria in a fixed biofilm

Carl Morten Bilbo, Erik Arvin, Helle Holst, Henrik Spliid

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Methane-oxidizing bacteria were grown in a fixed biofilm reactor in order to study their ability to degrade chlorinated aliphatic hydrocarbons. Focus is on the growth behaviour of the mixed culture. The growth is described by a model that includes methanotrophic bacteria in the active biomass fraction. The inactive biomass fraction consists of exocellular polymers and biodegradable and inert particulate biomass. The model describes the oxygen respiration in detail. Yield coefficients, decay constants and hydrolysis constants are estimated based on the oxygen respiration. An analysis of the observability of the system reveals that several of the coefficients cannot be determined explicitly due to the complexity of the model and the limited amount of variables measured. Estimation procedures based on least squares methods are employed and parameter estimates and confidence intervals are computed. The study forms the basis for setting up a future meauring programme. This work indicates a yield coefficient for methanotrophs of 0.36 mg biomass COD per mg CH$-4$/. In weight units this corresponds to approx. 1.44 mg biomass per mg CH$-4$/. This is close to the theoretical maximum growth yield for methanotrophs.
Original languageEnglish
JournalWater Research
Volume26
Issue number3
Pages (from-to)301-309
ISSN0043-1354
Publication statusPublished - 1992

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