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Pentachlorophenol biodegradation kinetics of an oligotrophic fluidized-bed enrichment culture.

Abstract：

:A fluidized-bed reactor (FBR) was used to enrich an aerobic chlorophenol-degrading microbial culture. Long-term continuous-flow operation with low effluent concentrations selected oligotrophic microorganisms producing good-quality effluent for pentachlorophenol(PCP)-contaminated water. PCP biodegradation kinetics was studied using this FBR enrichment culture. The results from FBR batch experiments were modeled using a modified Haldane equation, which resulted in the following kinetic constants: qmax = 0.41 mg PCP mg protein-1 day-1, Ks = 16 micrograms l-1, Ki = 5.3 mg l-1, and n = 3.5. These results show that the culture has a high affinity for PCP but is also inhibited by relatively low PCP concentrations (above 1.1 mg PCP l-1). This enrichment culture was maintained over 1 year of continuous-flow operation with PCP as the sole source of carbon and energy. During continuous-flow operation, effluent concentrations below 2 micrograms l-1 were achieved at 268 min hydraulic retention time (tHR) and 2.5 mg PCP l-1 feed concentration. An increase in loading rate by decreasing tHR did not significantly deteriorate the effluent quality until a tHR decrease from 30 min to 21 min resulted in process failure. Recovery from process failure was slow. Decreasing the feed PCP concentration and increasing tHR resulted in an improved process recovery.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Melin ES,Ferguson JF,Puhakka JA

doi

10.1007/s002530050994

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

675-82

issue

6

eissn

0175-7598

issn

1432-0614

journal_volume

47

pub_type

杂志文章

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