A model for optimum design of activated sludge plants

Akça, Lütfi; Kinaci, Cumali; Karpuzcu, Mehmet

doi:10.1016/0043-1354(93)90026-e

Cited by 31 publications

(14 citation statements)

References 10 publications

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“…Results obtained are summarized in Table II. [1] What is first observed in Table II is the small significance of specific pollution removal by means of ozonation in terms of COD and TOC, even at high ozone doses. Ratios of COD and TOC removal to utilized ozone were determined taking into account OMT.…”

Section: Influence Of Ozone Dosementioning

confidence: 87%

“…Oxidation efficiency was expressed as the percentages of COD, TOC, polyphenol, and UV 254 absorbance removal. On the other hand, since ozone was not found in solution, ozone mass transfer efficiency (OMT) was calculated from the ratio between utilized and applied ozone, according to Equation [1]. In this equation, and stand for the ozone concentration in the inlet gas and in the off-gas, respectively.…”

Section: Influence Of Ozone Dosementioning

confidence: 99%

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Impact of Water Temperature on Resolving the Challenge of Assuring Disinfection While Limiting Bromate Formation

Galey

Dilé

Gatel

et al. 2004

Ozone: Science & Engineering

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This article presents a laboratory study of the ozonation of diluted cherry stillage, a high-strength wastewater. Influence of variables, kinetics, and the effects of an ozonation stage coupled with the biological treatment by activated sludge are addressed. Single activated sludge processing was shown effective to remove biological oxygen demand (BOD) and chemical oxygen demand (COD) but polyphenols were reduced to a lesser extent. On the other hand, direct wastewater ozonation did not reduce COD and total organic carbon (TOC) appreciably, and foaming problems were experienced when a high gas flow rate was applied. However, polyphenols and UV 254 absorbance decreased substantially by means of ozonation. To best achieve complete cherry stillage purification, two ways of coupling ozonation with activated sludge are proposed. Ozonation prior to activated sludge is advised for high-concentration wastewater to reduce polyphenol concentration, thus removing inhibiting effects. For wastewater with low polyphenol concentration the sequence activated sludge-ozonation-activated sludge is preferred to enhance the overall process performance in terms of oxidation efficiency and sludge settling.

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Section: Influence Of Ozone Dosementioning

confidence: 87%

Section: Influence Of Ozone Dosementioning

confidence: 99%

Impact of Water Temperature on Resolving the Challenge of Assuring Disinfection While Limiting Bromate Formation

Galey

Dilé

Gatel

et al. 2004

Ozone: Science & Engineering

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“…A coupled model aimed at sizing the biological reactors and the final clarifier of an activated sludge system has been developed by Akca et al (1993). The authors refer to the over mentioned simplified model by Lawrence and McCarty (1970) to simulate the biological process, considering only one substrate and one form of biomass.…”

Section: Literature Reviewmentioning

confidence: 99%

The Proper Size of Activated Sludge Systems as a Function of the Required Performances

Esposito¹,

Fabbricino²,

Pirozzi³

2007

proc water environ fed

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A new procedure for sizing the biological reactors and the final settling of single sludge systems aimed at nitrogen degradation is proposed. Both combined nitrification and pre-denitrification systems are considered. The procedure is innovative as it is able to give the proper size of the treatment phases as a function of the required performances. A steady-state model taking into account both suspended and dissolved substrates is developed for the biological phases, while the limiting solid flux theory is assumed for the design of the settling phase. A relationship correlating the two phases is obtained expressing opportunely the sludge recycle and waste flow rates, without recourse to any empirical parameter. The combined nitrification model includes three substrates (soluble and particulate biodegradable organic matter and ammonia nitrogen) and gives an explicit expression of the biological reactor volume if both the influent flow composition and the kinetic parameters are known and the effluent nitrogen concentrations are fixed. The pre-denitrification model considers four substrates (the above cited and the nitrate nitrogen) and makes it possible to define the applicability of the system and to express in explicit terms the biological reactor volumes, as in the previous case. Applications of the biological and settling models show: i) a relevant effect of the influent flow rate, the organic and nitrogen load and the desired effluent characteristics on the size of the treatment system; ii) an important influence of the maximum ammonia nitrogen removal rate and the ratio between the decay rates of heterotrophic and autotrophic biomass on the nitrification reactor volume and iii) an underestimation of the denitrification reactor volume when zero order in stead of MichaelisMenten type denitrification kinetics are used.

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“…Koelling and Rasaratnam (1986) have attempted to develop a methodology for selecting the cost effective optimal design parameters for a wastewater treatment plant at design stage using modified Hooke and Jeeves search technique (Hooke and Jeeves, 1961). Akca et al (1993) have carried out an optimization study to minimize the total plant cost (i.e., operation, maintenance and construction cost) using BoxComplex algorithm (Box, 1965). In their study, the important decision variables are: mean cell-residence time, hydraulic retention time, sludge recirculation ratio, and effluent overflow rate.…”

Section: Introductionmentioning

confidence: 99%

Optimization of an operating domestic wastewater treatment plant using elitist non-dominated sorting genetic algorithm

Iqbal

Guria

2009

Chemical Engineering Research and Design

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A model for optimum design of activated sludge plants

Cited by 31 publications

References 10 publications

Impact of Water Temperature on Resolving the Challenge of Assuring Disinfection While Limiting Bromate Formation

Impact of Water Temperature on Resolving the Challenge of Assuring Disinfection While Limiting Bromate Formation

The Proper Size of Activated Sludge Systems as a Function of the Required Performances

Optimization of an operating domestic wastewater treatment plant using elitist non-dominated sorting genetic algorithm

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