Microbial dynamics in an extractive membrane bioreactor exposed to an alternating sequence of organic compounds

Jorge, Ruben Ferreira; Livingston, Andrew G.

doi:10.1002/1097-0290(20001105)70:3<313::aid-bit8>3.0.co;2-r

Cited by 21 publications

(11 citation statements)

References 32 publications

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“…A potential commensal relationship between the microbial strains developed and improved the system response to SAP. This defined microbial culture was further applied in a single tube extractive membrane bioreactor (STEMB) exposed to SAP,17 where the biofilm and the suspended culture dynamics were characterised. The biofilm was able to maintain active portions of both microbial strains in the system.…”

Section: Introductionsupporting

confidence: 91%

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Biological treatment of an alternating source of organic compounds in a single tube extractive membrane bioreactor

Jorge

Livingston

2000

J. Chem. Technol. Biotechnol.

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The performance of a single tube extractive membrane bioreactor (STEMB) exposed to an alternating sequence of toluene (TOL) and dichloromethane (DCM) was investigated. These compounds are two of the most commonly used solvents in the chemical and pharmaceutical industries, and so were used to simulate the scenario of sequentially alternating pollutants. Unde®ned microbial cultures were used. During experiments, no TOL accumulation was detected in the STEMB. It may be possible that a commensal microbial relationship developed in the system, which maintained the microbial culture responsible for TOL degradation active throughout experiments. On the other hand, accumulation of DCM was detected whenever this compound was introduced. These accumulations resulted in a transient decrease in the removal ef®ciency of the STEMB. The in¯uence of the membrane-attached bio®lm in decreasing DCM discharges was shown. Investigations into the use of an additional carbon source to improve the system response were carried out during critical periods of operation, eg start-up and starvation periods. This strategy proved a successful tool in reducing DCM discharges.

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Section: Introductionsupporting

confidence: 91%

“…This suggests that biofilm growth on the membrane did not decrease the transfer of the organic compounds. This result is in accordance with previous work 17. The main limitation to the transfer of the organic compounds is the liquid boundary layer on the waste‐water side due to the low Reynolds numbers used.…”

Section: Resultsmentioning

confidence: 99%

Biological treatment of an alternating source of organic compounds in a single tube extractive membrane bioreactor

Jorge

Livingston

2000

J. Chem. Technol. Biotechnol.

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“…These filters were then dried at 105 C for 24 hours, and the increase in weight was measured [7]. Turbidity was measured using a turbidity meter (model 19977 micro TPI from scientific company).…”

Section: Methodsmentioning

confidence: 99%

Performance of an oxidation ditch retrofitted with a membrane bioreactor during the start-up

et al. 2005

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“…5 Furthermore, immobilized microorganisms have been found to remain more active in starvation periods and revealed a shorter lag phase after introduction of a degradable compound. 68,162 This has been attributed to a better biomass retention and higher cell density in immobilized biomass reactors, 163,169 which is particularly important for slow growing organisms that perform the biodegradation of xenobiotic compounds. A high biomass density and retention is for the same reason expected to enhance the performance of bioreactors treating SAP.…”

Section: Bioreactor Considerations For the Treatment Of Highly Variabmentioning

confidence: 99%

Biotreatment of Industrial Wastewaters under Transient-State Conditions: Process Stability with Fluctuations of Organic Load, Substrates, Toxicants, and Environmental Parameters

Sipma

Osuna

Emanuelsson

et al. 2010

Critical Reviews in Environmental Science and Technology

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Biotreatment of industrial wastewater is often challenged by operation under transient states with respect to organic loads, pollutants, and physical characteristics. Furthermore, the potential presence of inhibitory compounds requires careful monitoring and adequate process design. This review describes difficulties encountered in biological treatment of wastewater with highly variable influent characteristics. Typical design aspects of biological processes are presented and discussed with respect to their success in treating highly fluctuating wastewaters. In general, biomass retention is a key factor for dealing with highly fluctuating and/or inhibitory wastewater, but the how it operates also affects the stability of performance, as it was shown that dynamic operation instead of operation at a constant flow enhances biodegradation onset and more evenly distributed activity. Although ultimately stable effluent quality must be achieved, the microbial population stability is not necessarily high, as it was shown that microbial diversity and flexibility may play a critical role in functional stability.

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Microbial dynamics in an extractive membrane bioreactor exposed to an alternating sequence of organic compounds

Cited by 21 publications

References 32 publications

Biological treatment of an alternating source of organic compounds in a single tube extractive membrane bioreactor

Biological treatment of an alternating source of organic compounds in a single tube extractive membrane bioreactor

Performance of an oxidation ditch retrofitted with a membrane bioreactor during the start-up

Biotreatment of Industrial Wastewaters under Transient-State Conditions: Process Stability with Fluctuations of Organic Load, Substrates, Toxicants, and Environmental Parameters

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