Summary
Alcaligenes sp. A 7-2 has been applied in a packed-bed fermenter to degrade 4-chlorophenol in municipal wastewater continuously. With sterile wastewater degradation rates up to 300 μmol/l/h were reached when precultivated Alcaligenes sp. A 7-2 had been adsorbed onto the Lecaton-packed-bed-material.
The natural microbial population of the wastewater was not able to degrade 4-chlorophenol. Beside an accumulation of the haloaromatic compound a yellow-greenish substance exhibiting the spectral characteristics of 5-chloro-2-hydroxymuconic acid semialdehyde was found.
This compound caused a rapid decrease in metabolic activity of the microbial culture.
With non-sterile wastewater Alcaligenes sp. A 7-2 could not be established as member of the natural mixed population. Due to the poor retainment of the specialized strain in the packed-bed the degradation capacity of the fermentation system decreased and 4-chlorophenol was accumulated.
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Westmeier, F., Rehm, H.J. Degradation of 4-chlorophenol in municipal wastewater by adsorptiv immobilized Alcaligenes sp. A 7-2. Appl Microbiol Biotechnol 26, 78–83 (1987). https://doi.org/10.1007/BF00282152
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DOI: https://doi.org/10.1007/BF00282152