Analysis of the activated sludge model (number 1)

Nelson, Mark; Sidhu, Harvinder

doi:10.1016/j.aml.2008.05.003

Cited by 39 publications

(25 citation statements)

References 4 publications

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“…It is hoped that these insights will be informative in the study of the various IWA models, where analytic expressions for the steady-states are unavailable and purely numerical techniques must be deployed. A start on investigating ASM-1 using continuation methods is presented in [13]. (-)…”

Section: Resultsmentioning

confidence: 99%

Analysis of an activated sludge model in which dead biomass is recycled into slowly biodegradable particulate substrate

Alharbi

Nelson

Worthy

et al. 2015

Asia-Pacific J Chem Eng

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A significant drawback of the activated sludge process is the production of excess 'sludge'; the disposal of which can account for 50-60% of the running costs of a wastewater treatment plant. We investigate a model for the activated sludge process in which the influent contains a mixture of soluble and slowly biodegradable particulate substrate. Within the bioreactor, the particulate substrate is hydrolyzed to form soluble substrate. In turn, these are used for growth by the biomass. Biomass decay produces slowly biodegradable substrate and non-biodegradable particulates. Steady-state analysis is used to investigate how the amount of sludge formed depends upon the residence time and the use of a settling unit. We show that when the steady-state sludge content is plotted as a function of the residence time that there are three generic response diagrams. The value of the effective recycle parameter determines which type of response diagram is observed. If this parameter is greater than a critical value, then the sludge content is guaranteed to be greater than a target value. The dependence of this critical value upon the chemical oxygen demand in the feed and how the chemical oxygen demand is partitioned between its constitutive components is investigated. (2) School of Physical, Environmental and Mathematical Science, UNSW at ADFA, Canberra, ACT 2600, Australia Disciplines Engineering | Science and Technology StudiesNovember 15, 2014 AbstractThe activated sludge process is one of the major processes used in the biological treatment of wastewater.A significant drawback of this process is the production of excess sludge, the disposal of which can account for 50-60% of the running costs of a plant.We investigate a model for the activated sludge process in which the influent contains a mixture of soluble and slowly biodegradable particulate substrate. Within the bioreactor the biodegradable particulate substrate is hydrolyzed to form soluble substrate. In turn these are used for growth by the biomass. Biomass decay produces slowly biodegradable substrate in addition to non-biodegradable particulates.We use steady-state analysis to investigate how the amount of sludge formed depends upon the residence time and the use of a settling unit. We show that when the steady-state sludge content is plotted as a function of the residence time that there are three generic response diagrams, depending upon the value of the effective recycle parameter. We find that if the effective recycle parameter is higher than a critical value then sludge content is guaranteed to be greater than a target value. We investigate how this critical value depends upon the chemical oxygen demand in the feed and how the chemical oxygen demand is partitioned between its constitutive components.

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Section: Resultsmentioning

confidence: 99%

Analysis of an activated sludge model in which dead biomass is recycled into slowly biodegradable particulate substrate

Alharbi

Nelson

Worthy

et al. 2015

Asia-Pacific J Chem Eng

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“…The system being aerobic suspended growth, the required COD:N:P is 100:10:1 [17][18][19][20]. The food/microorganism (F/M) ratio was within the range 0.03-0.2 and the mixed liquor volatile suspended solids (MLVSS)/MLSS ratio of the activated sludge at the beginning of all the experiments was 0.37.…”

Section: Methodsmentioning

confidence: 99%

“…This reduction may be because of the following three reasons: (a) entrapment of COD in the flocs, (b) adsorption of COD on the surface of microbes, and (c) ingestion of COD inside the microbes. Hence, inspite of COD reduction in wastewater, the treatment remains incomplete due to untreated COD present in the sludge [15,17,20,[22][23][24][25]. Thus, at 9000 mg L À1 MLSS concentration the COD reduction was highest, i.e., 76.83% at the end of 60 hours of treatment.…”

Section: Bioaccumulationmentioning

confidence: 99%

Kinetic studies on agrochemicals wastewater treatment by aerobic activated sludge process at high MLSS and high speed agitation

Karkare

Murthy

2012

Journal of Industrial and Engineering Chemistry

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“…Próby zastosowania go do modelowania oczyszczania ścieków przemysłowych najczęściej dają słabe rezultaty. Model jest oparty na 13 równaniach [6]. Rozwinięciem modelu ASM1 o biologiczną defosfatację był model ASM2 oraz ASM2d który uwzględnia aktywność mikroorganizmów akumulujących związki fosforu (PAO).…”

Section: Z Kowalewski E Neverova-dziopakunclassified

Przebieg Symulacji Komputerowej Procesu Oczyszczania Scieków Komunalnych W Reaktorze Osadu Czynnego

Kowalewski¹,

Neverova-Dziopak²

2016

ZNPRzBiS

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Celem badań było ustalenie wpływu ilości i zakresu parametrów jakości ścieków surowych na wiarygodność wyników symulacji, co umożliwiłoby ustalenie optymalnej częstotliwości ich monitoringu, niezbędnego do pozyskiwania danych do modelowania w programach ASM. W artykule przedstawiono metodykę prowadzenia symulacji komputerowej procesu oczyszczania ścieków komunalnych w reaktorach biologicznych z osadem czynnym. Zaprezentowano sposób przygotowania i przetwarzania danych wejściowych do modelu oraz sposoby oceny i weryfikacji wyników symulacji za pomocą testów statystycznych. Modelowanie było wykonane w programie BioWin na przykładzie oczyszczalni ścieków komunalnych "Kujawy" w Krakowie. W oparciu o wstępne wyniki niniejszych badań moż-na wnioskować, że w celu uzyskania wiarygodnych wyników symulacji pracy bioreaktora w modelu ASM niezbędne jest prowadzenie monitoringu podstawowych paramentów jakości ścieków online.

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Analysis of the activated sludge model (number 1)

Cited by 39 publications

References 4 publications

Analysis of an activated sludge model in which dead biomass is recycled into slowly biodegradable particulate substrate

Analysis of an activated sludge model in which dead biomass is recycled into slowly biodegradable particulate substrate

Kinetic studies on agrochemicals wastewater treatment by aerobic activated sludge process at high MLSS and high speed agitation

Przebieg Symulacji Komputerowej Procesu Oczyszczania Scieków Komunalnych W Reaktorze Osadu Czynnego

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