Modelling the consumption of dissolved contaminants by biofilm periphyton in open-channel flow

Lau, Y. Lam

doi:10.1016/0043-1354(90)90051-7

Cited by 22 publications

(16 citation statements)

References 11 publications

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“…Thicker biofilms are seen to lead to increased substrate utilization. These results have been obtained using parameter values typical of those used by Lau [4] in his zero-order model, but with the addition of P/W=7 to account for the added river bottom surface area for biofilm activity due to rocks or gravel (Gantzer et al [2]. These calculations have assumed C(0)=500 mg/l, a very high initial substrate concentration, since it is known that biofilm activity is approximately zero order only when substrate concentration is high.…”

Section: Steady Convective-biokinetic Scenariosmentioning

confidence: 97%

“…In the meantime, the planning tool provides for comparative scenario evaluation. Prior to the development of this tool, the state of the art was typified by work of Lau [4] which presented idealized cases which could be solved in closed form mathematically. With this planning tool, a user can determine relative effects in more 'real world' scenarios that cannot be modeled with closed form mathematics.…”

Section: Concusionsmentioning

confidence: 99%

“…In many instances these steady-state profiles have already been presented. Again, model parameter values have been taken from Lau [4] for the zero-order biokinetic model, Gantzer et al [2] for the first-order model, and Rittmann and McCarty [15] for the Monod model.…”

Section: Unsteady Convective-biokinetic Scenariosmentioning

confidence: 99%

“…These studies have been performed in an idealized model stream reach. Closed form representations of contaminant reduction in streams via bioremediation have been modeled by Lau [4] for certain idealized cases. Multispecies biofilm models have been developed by Wanner and Gujer [5,6] and Namkung et al [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Development of a user-friendly software planning tool to assess effects of biofilm activity on contaminant reduction in streams

Kuhlman

Lyell

1996

Journal of Network and Computer Applications

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Section: Steady Convective-biokinetic Scenariosmentioning

confidence: 97%

Section: Concusionsmentioning

confidence: 99%

Section: Unsteady Convective-biokinetic Scenariosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of a user-friendly software planning tool to assess effects of biofilm activity on contaminant reduction in streams

Kuhlman

Lyell

1996

Journal of Network and Computer Applications

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“…No matter which way is selected, biofilm will grow on the surface of gravels and utilize the organic pollutants in the river water. Some researchers reported that the biofilm growing on the gravels will be thicker for an open channel with lower flow velocity (Lau, 1990;Lau and Liu, 1993).…”

Section: Introductionmentioning

confidence: 99%

Treatment of polluted river water by a gravel contact oxidation system constructed under riverbed

Juang

Tsai

Liu³

et al. 2008

Int. J. Environ. Sci. Technol.

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ABSTRACT:The objective of this study was to evaluate the treatment efficiency of a gravel contact oxidation treatment system which was newly constructed under the riverbed of Nan-men Stream located at the Shin Chu City of Taiwan. The influent and effluent water samples were taken periodically for the analyses of pH, temperature, dissolved oxygen, total suspended solids, five-day biological oxygen demand, NH 4 + -N. The results showed that the average removal rates of five-day biological oxygen demand, total suspended solids and NH 4 + -N were 33.6% (between -6.7% and 82.1%), 56.3% (between -83.0% and 93.4%) and 10.7% (between -13.0% and 83.3%), respectively. The calculated mean first order reaction rate constant for five-day biological oxygen demand was 4.58/day with a standard deviation of 4.07/day and for NH 4 + -N was 2.15/day with a standard deviation of 5.68/day. Therefore, it could be said that this gravel-contact-oxidation system could effectively remove biological oxygen demand, total suspended solids, and NH 4 + -N in river water at a relatively short hydraulic retention time, although its pollutant treatment efficiency was not quite stable. However, to reach better or more stable treatment efficiency, aeration might sometimes be necessary to increase the dissolved oxygen in influent river water. And, longer hydraulic retention time of the system might also be required to increase NH 4 + -N removal efficiency.

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Differences in the sensitivity of benthic microalgae to ZN and CD regarding biofilm development and exposure history

Ivorra

Bremer

Guasch

et al. 2000

Enviro Toxic and Chemistry

113

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Microbenthic biofilms are consortia of autotrophic and heterotrophic organisms imbedded in a matrix of polymers and particles. As biofilms develop, internal cycling of materials might predominate, and dependence on external conditions is reduced. The mature biofilm structure may act as a barrier against deleterious effects of metals on microphytobenthos. To validate this hypothesis, biofilms from two lowland streams near the Dutch-Belgian border, the extremely Zn-and Cd-polluted Eindergatloop and the relatively clean Keersop in the River Dommel subsystem, were collected after 2 weeks (young) and 6 weeks (old) of colonization. Young and old biofilms from both sites were subsequently exposed in the laboratory to Zn and Cd concentrations mimicking that of the heavily polluted stream for a period of 2 weeks. Diatom composition, chlorophyll a, total carbohydrates, Zn and Cd concentrations, minimal chlorophyll fluorescence, and photon yield demonstrated more pronounced metal effects on the young than on the old reference biofilms. In contrast, colonization time had less effect on the overall response of the extremely polluted biofilms. Therefore, biofilms in an early colonization stage are more vulnerable than mature biofilms to metal exposure, and exposure history determines the response of biofilms to metals.

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Modelling the consumption of dissolved contaminants by biofilm periphyton in open-channel flow

Cited by 22 publications

References 11 publications

Development of a user-friendly software planning tool to assess effects of biofilm activity on contaminant reduction in streams

Development of a user-friendly software planning tool to assess effects of biofilm activity on contaminant reduction in streams

Treatment of polluted river water by a gravel contact oxidation system constructed under riverbed

Differences in the sensitivity of benthic microalgae to ZN and CD regarding biofilm development and exposure history

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