A general model for single-sludge wastewater treatment systems

Henze, Mogens; Grady, C. P. Leslie; Gujer, Willi; Marais, G. V. R.; Matsuo, Tetsuji

doi:10.1016/0043-1354(87)90058-3

Cited by 637 publications

(561 citation statements)

References 9 publications

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“…Thus the step-feed reactor cascade does not improve the performance over that of a single reactor. This is surprising as the step-feed reactor cascade is common in the implementation of the activated sludge process [1,2]. We conclude that the step-feed reactor cascade is not appealing as a viable alternative to a conventional reactor design.…”

Section: Resultsmentioning

confidence: 61%

“…An alternative reactor configuration is to use a stepfeed design [1,2]. This is similar to the standard configuration in that the product stream from the ith reactor flows into the i þ 1 ð Þth reactor.…”

Section: Introductionmentioning

confidence: 99%

“…We refer to this configuration as a "step-feed reactor cascade" (SFRC). This reactor design is common in the implementation of the activated sludge process [1,2]. In a more general version of this design, sometimes called a multistream reactor cascade, the reactors in the cascade do not necessarily receive an equal proportion of the feed stream.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Analysis of a Standard Reactor Cascade and a Step-Feed Reactor Cascade for Biological Processes Described by Monod Kinetics

Sidhu

Nelson

Balakrishnan

2015

Chemical Product and Process Modeling

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We analyse the steady-state operation of two types of reactor cascade without recycle. The first is a standard reactor cascade in which the feed stream enters into the first reactor. The second is a step-feed reactor cascade in which an equal proportion of the feed stream enters each reactor in the cascade. The reaction is assumed to be a biological process governed by Monod growth kinetics with a decay coefficient for the microorganisms. The steady-states of both models are found for an arbitrary number of reactors and their stability determined as a function of the residence time. We show that in a step-feed reactor cascade the substrate and biomass concentrations leaving the reactor of the cascade are identical to those leaving the first reactor of the cascade. We further show that this result is true for a general specific growth rate of the form μ (S,X). Thus for such processes the non-standard cascade offers no advantage over that of a single reactor. This is surprising because the use of a non-standard cascade has been proposed as a mechanism to improve the biological treatment of wastewater.

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Section: Resultsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Analysis of a Standard Reactor Cascade and a Step-Feed Reactor Cascade for Biological Processes Described by Monod Kinetics

Sidhu

Nelson

Balakrishnan

2015

Chemical Product and Process Modeling

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“…O modelo empregado reproduz as equações originalmente propostas por Henze et al (1987) mas não considera, no entanto, fenômenos de crescimento aeróbio de microrganismos autotróficos e de decaimento de microrganismos autotróficos nem outras parcelas de sólidos presentes no processo de lodos ativados.…”

Section: Modelo Dinâmicounclassified

Desenvolvimento de sistema de Controle Ótimo para processo de tratamento de efluentes

Reis

Mendonça

2014

Eng. Sanit. Ambient.

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Este trabalho teve por objetivo geral propor e avallar técnicas de desenvolvimento de sistemas de controle automático para processos de tratamento de efluentes envolvendo lodos ativados. Os sistemas de controle propostos foram estabelecidos a partir da aplicação da Teoria de Controle Ótimo, considerando o emprego de um modelo dinâmico simplificado do processo de lodos ativados. Simulações computacionais foram utilizadas para a avaliação do desempenho dos sistemas de controle propostos. Os resultados obtidos permitiram concluir que o modelo dinâmico do processo de lodos ativados utilizado neste trabalho, estabelecido a partir de uma simplificação de modelo largamente aceito, segundo literatura técnica corrente, mostrou-se estável e adequado à definição de sistemas de controle.

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“…The treatment of domestic wastewater during the treatment produced the water of good quality and there is an interest in its potential for drinking water supply (McCartey et al, 1984). The domestic wastewater contains readily biodegradable organic matter which is mainly composed of volatile fatty acids and low molecular weight carbohydrates that can pass through the cell membrane and be metabolized within minutes by the bacteria (Henze et al, 1987). It has been reported that microorganisms that bring about the decomposition of organic matter in wastewater can perform their activity efficiently in the activated sludge system (Barker and Dold, 1995).…”

mentioning

confidence: 99%

Performance evaluation of biosimulator for treating domestic wastewater using activated sludge treatment system

Hashmi¹

2010

Journal of Applied Sciences and Environmental Management

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This research investigation was aimed at demonstrating the performance evaluation of pilot activated sludge treatment system (biosimulator; model MF-114). An intensive analytical program was followed for evaluating the performance efficiency of the biosimulator by maintaining the dissolved oxygen (DO) concentration at 4.0 mg/L throughout the study period. Biosimulator performance was evaluated after every 2 hours and analyzed for pH, DO, COD, ammonia-nitrogen (NH 3 -N), nitrite-nitrogen (NO 2 -N) and nitrate-nitrogen (NO 3 -N). In all ten experimental replicates were performed and the mean figures are taken for discussion. Although no significant variation in the pH was observed during the study period but the mean pH values of the samples during the treatment process gradually increased and it ranged from 6.81-7.52. The removal of COD was found to be in direct relationship with retention time and the mean COD of the raw wastewater samples ranged from 164-1160 mg/L whereas it got reduced considerably during the treatment process and the mean removal efficiency was found to be 86%. The COD and NO 2 -N removal efficiency was better than NH 3 -N and NO 3 -N this is considered to be satisfactory especially with respect to organic loading and retention time. Similarly, the mean NH 3 -N values of wastewater after 29 hours of treatment were found to be fluctuating between 14.52-20.54 mg/L whereas the mean NO 3 -N level of the raw wastewater ranged from 0.106-0.279 mg/L. The overall conditions were very much favorable even at high organic loading and minimum retention time. It is therefore concluded that the system is practically feasible for the treatment of wastewater containing high content of organic matter. @JASEM

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A general model for single-sludge wastewater treatment systems

Cited by 637 publications

References 9 publications

An Analysis of a Standard Reactor Cascade and a Step-Feed Reactor Cascade for Biological Processes Described by Monod Kinetics

An Analysis of a Standard Reactor Cascade and a Step-Feed Reactor Cascade for Biological Processes Described by Monod Kinetics

Desenvolvimento de sistema de Controle Ótimo para processo de tratamento de efluentes

Performance evaluation of biosimulator for treating domestic wastewater using activated sludge treatment system

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