A one-dimensional model for thermal-field prediction in wastewater treatment maturation ponds

N. W. Dahl, P. L. Woodfield, Charles LEMCKERT

Research output: Contribution to conference (non-published works)Paper

Abstract

Maturation ponds use the ultra-violet component of natural sunlight for the disinfection of micro-organisms present in wastewater. The details of the mixing processes are still not well understood and clarification is required for optimal and reliable pond design. Temperature and radiation measurements were collected from a maturation pond in South-East Queensland and compared to a one-dimensional model to elucidate the dominant mechanisms for mixing and heat transfer. It was found that mixing in the pond follows a diurnal pattern of stable stratification during sunlit hours followed by downward mixing from the surface, eroding the stratification over several hours. Finally, a uniform vertical temperature distribution is established during hours of darkness. The dominant mechanisms for mixing are top-down natural convection during the evenings and wind shear during high wind-speed events. Radiation and molecular diffusion were found to be less significant to the heat transfer and establishment of stable stratification.
Original languageEnglish
Pages37-42
Number of pages6
Publication statusPublished - Jul 2016
EventAustralasian Heat and Mass Transfer Conference - Brisbane, Australia
Duration: 14 Jul 201615 Jul 2016
Conference number: 10th

Conference

ConferenceAustralasian Heat and Mass Transfer Conference
CountryAustralia
CityBrisbane
Period14/07/1615/07/16

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maturation
pond
prediction
stratification
heat transfer
wind shear
disinfection
wind velocity
temperature
convection
wastewater treatment
wastewater
radiation

Cite this

Dahl, N. W., Woodfield, P. L., & LEMCKERT, C. (2016). A one-dimensional model for thermal-field prediction in wastewater treatment maturation ponds. 37-42. Paper presented at Australasian Heat and Mass Transfer Conference, Brisbane, Australia.
Dahl, N. W. ; Woodfield, P. L. ; LEMCKERT, Charles. / A one-dimensional model for thermal-field prediction in wastewater treatment maturation ponds. Paper presented at Australasian Heat and Mass Transfer Conference, Brisbane, Australia.6 p.
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Dahl, NW, Woodfield, PL & LEMCKERT, C 2016, 'A one-dimensional model for thermal-field prediction in wastewater treatment maturation ponds' Paper presented at Australasian Heat and Mass Transfer Conference, Brisbane, Australia, 14/07/16 - 15/07/16, pp. 37-42.

A one-dimensional model for thermal-field prediction in wastewater treatment maturation ponds. / Dahl, N. W.; Woodfield, P. L.; LEMCKERT, Charles.

2016. 37-42 Paper presented at Australasian Heat and Mass Transfer Conference, Brisbane, Australia.

Research output: Contribution to conference (non-published works)Paper

TY - CONF

T1 - A one-dimensional model for thermal-field prediction in wastewater treatment maturation ponds

AU - Dahl, N. W.

AU - Woodfield, P. L.

AU - LEMCKERT, Charles

PY - 2016/7

Y1 - 2016/7

N2 - Maturation ponds use the ultra-violet component of natural sunlight for the disinfection of micro-organisms present in wastewater. The details of the mixing processes are still not well understood and clarification is required for optimal and reliable pond design. Temperature and radiation measurements were collected from a maturation pond in South-East Queensland and compared to a one-dimensional model to elucidate the dominant mechanisms for mixing and heat transfer. It was found that mixing in the pond follows a diurnal pattern of stable stratification during sunlit hours followed by downward mixing from the surface, eroding the stratification over several hours. Finally, a uniform vertical temperature distribution is established during hours of darkness. The dominant mechanisms for mixing are top-down natural convection during the evenings and wind shear during high wind-speed events. Radiation and molecular diffusion were found to be less significant to the heat transfer and establishment of stable stratification.

AB - Maturation ponds use the ultra-violet component of natural sunlight for the disinfection of micro-organisms present in wastewater. The details of the mixing processes are still not well understood and clarification is required for optimal and reliable pond design. Temperature and radiation measurements were collected from a maturation pond in South-East Queensland and compared to a one-dimensional model to elucidate the dominant mechanisms for mixing and heat transfer. It was found that mixing in the pond follows a diurnal pattern of stable stratification during sunlit hours followed by downward mixing from the surface, eroding the stratification over several hours. Finally, a uniform vertical temperature distribution is established during hours of darkness. The dominant mechanisms for mixing are top-down natural convection during the evenings and wind shear during high wind-speed events. Radiation and molecular diffusion were found to be less significant to the heat transfer and establishment of stable stratification.

KW - convection

KW - diffusivitiy

KW - shallow water

KW - pond

M3 - Paper

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ER -

Dahl NW, Woodfield PL, LEMCKERT C. A one-dimensional model for thermal-field prediction in wastewater treatment maturation ponds. 2016. Paper presented at Australasian Heat and Mass Transfer Conference, Brisbane, Australia.