Operating strategies for variable‐flow sequencing batch reactors

Bungay, S.; Humphries, Michael; Stephenson, Tom

doi:10.1111/j.1747-6593.2006.00031.x

Cited by 15 publications

(12 citation statements)

References 9 publications

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“…The design and operation of SBR must consider the biological process requirement and the hydraulic regime to maintain the quality of treatment. The fill strategy and the cycle time control are important factors to be taken into consideration while optimizing the treatment process 34. While designing the fill strategy for the treatment of toxic wastewater, its biodegradability and concentration should be taken into account.…”

Section: Sbr: Different Modes Of Operationmentioning

confidence: 99%

Sequencing batch reactor technology for biological wastewater treatment: a review

Singh

Srivastava

2010

Asia-Pacific J Chem Eng

143

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Wastewater treatment has been a challenge throughout the years due to varying influent characteristics and stringent effluent regulations. In response to this dilemma, a reliable, cost-effective and high-efficiency sequencing batch reactor (SBR) technology has been recently developed. SBRs are variations of the activated sludge process that operates on a fill-and-draw basis. It combines both aerobic-anaerobic phases in one unit and saves up to 25% of the aeration costs concomitant with low sludge production. Consequently, simultaneous nitrogen and phosphorus removal from the wastewater could be achieved by adjusting the actual operating cycle. This review paper discusses the technical description and operational flexibility of SBR for the treatment of wide range of effluent under different operational conditions, together with its modifications that could increase the effectiveness of SBR systems in the future.

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Section: Sbr: Different Modes Of Operationmentioning

confidence: 99%

Sequencing batch reactor technology for biological wastewater treatment: a review

Singh

Srivastava

2010

Asia-Pacific J Chem Eng

143

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“…Switching to the next phase shortly after the detection of the reaction endpoint provides an optimum solution for both the process performance and the economies of the plant. For the SBR process, Bungay et al (2007) demonstrated that the flow-proportional cycle times control strategy use the treatment volume more efficiently than fixed cycle times. In our study, the on-line monitoring ORP and pH profiles indicated accurately the biochemical reaction procedures for anaerobic P-release, nitrifying denitrification and P-uptake.…”

Section: Establishing a Real-time Control Strategy For More Efficientmentioning

confidence: 99%

“…A laboratory-scale study by indicated that A 2 N-SBR showed steady phosphorus and nitrogen removals which enabled the removal of 15mg P/L and 105mg N/L at the expense of only 400 mg COD/L acetate (HAc), i.e. the optimal influent ratio was as low as 3.4 g COD/g N. Additionally, A 2 N-SBR integrates two SBRs which means it is easy to change operations, such as cycle times and flow rates (Irvine et al, 1997;Del Solar et al, 2004;Bungay et al, 2007). Therefore, the A 2 N-SBR has higher flexibility and has been regarded as effective, especially for small wastewater treatment plants.…”

Section: Introductionmentioning

confidence: 99%

Effect of influent nutrient ratios and hydraulic retention time (HRT) on simultaneous phosphorus and nitrogen removal in a two-sludge sequencing batch reactor process

Wang

Peng

Stephenson

2009

Bioresource Technology

143

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A laboratory-scale anaerobic-anoxic/nitrification sequencing batch reactor (A(2)N-SBR) fed with domestic wastewater was operated to examine the effect of varying ratios of influent COD/P, COD/TN and TN/P on the nutrient removal. With the increased COD/P, the phosphorus removals exhibited an upward trend. The influent TN/P ratios had a positive linear correlation with the phosphorus removal efficiencies, mainly because nitrates act as electron acceptors for the phosphorus uptake in the A(2)N-SBR. Moreover, it was found that lower COD/TN ratio, e.g. 3.5, did not significantly weaken the phosphorus removal, though the nitrogen removal first decreased greatly. The optimal phosphorus and nitrogen removals of 94% and 91%, respectively were achieved with influent COD/P and COD/TN ratios of 19.9 and 9.9, respectively. Additionally, a real-time control strategy for A(2)N-SBR can be undertaken based on some characteristic points of pH, redox potential (ORP) and dissolved oxygen (DO) profiles in order to obtain the optimum hydraulic retention time (HRT) and improve the operating reliability.

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“…In an SBR, the retention time, the duration of the aeration and anoxic phases, the settling time, and other conditions can be easily fitted to variations on load quality as well as effluent requirements. When properly designed and operated, SBRs offer important advantages over continuous processes, not only because of its efficiency and economical aspects, but also because of its small footprint and high flexibility and operation range …”

Section: Case Studymentioning

confidence: 99%

An approach to mechanistic event recognition applied on monitoring organic matter depletion in SBRs

et al. 2014

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A fundamental practice in process engineering is monitoring the state dynamics of a system. Unfortunately, observability of some states is related to high costs, time, and efforts. The mechanistic event recognition (MER) aims to detect an event (defined as a change of the system with specific significance to the operation of the process) that cannot be directly observed but has some predictable effect on the dynamics of the systems. MER attempts to apply fault diagnosis techniques using mechanistic “recognition” models to describe the process. A systematic method for building recognition models using optimal experimental design tools is presented. As proof of concept, the MER approach to detect organic matter depletion in sequencing batch reactors, measuring only ammonia, dissolved oxygen, and nitroxides is applied. The event, that is, consumption of organic matter to a level below 50 gCOD/m3, was successfully detected even though microbial activity is known to continue after organic matter depletion

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Operating strategies for variable‐flow sequencing batch reactors

Abstract: ABSTRACT

Cited by 15 publications

References 9 publications

Sequencing batch reactor technology for biological wastewater treatment: a review

Sequencing batch reactor technology for biological wastewater treatment: a review

Effect of influent nutrient ratios and hydraulic retention time (HRT) on simultaneous phosphorus and nitrogen removal in a two-sludge sequencing batch reactor process

An approach to mechanistic event recognition applied on monitoring organic matter depletion in SBRs

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