Control of SBR switching by fuzzy pattern recognition

Marsili-Libelli, Stefano

doi:10.1016/j.watres.2006.01.011

Cited by 51 publications

(34 citation statements)

References 36 publications

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“…Further research should be carried out to study the mechanisms triggering NO 2 -N accumulation in the SBR system. Studies on automatic control of conventional SBR systems using DO, pH and ORP probes have been carried out to enhance N and P removal and to reduce operational costs (Tilche et al 1999;Casellas et al 2006;Lee et al 2001;Lee and Oleszkiewicz 2003;Marsili-Libelli 2006). In the present study, the application of DO, pH and ORP real-time data to control the operation of intermittently aerated SBRs was studied.…”

Section: Effects Of the Aeration Rate On The Overall Performance Of Imentioning

confidence: 99%

Effect of Aeration Rate on Nutrient Removal from Slaughterhouse Wastewater in Intermittently Aerated Sequencing Batch Reactors

Healy

Zhan

et al. 2008

Water Air Soil Pollut

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The effect of aeration rate on nutrient removal from slaughterhouse wastewater was examined in two 10-L laboratory-scale sequencing batch reactors (SBRs-SBR1 and SBR2) operated at ambient temperature. The contaminants in the slaughterhouse wastewater had average concentrations of 4,000 mg chemical oxygen demand (COD) L −1 , 350 mg total nitrogen (TN) L −1 and 26 mg total phosphorus (TP) L −1 . The duration of a complete SBR operation cycle was 8 h and comprised four operational phases: fill (7 min), react (393 min), settle (30 min) and draw/idle (50 min). During the react phase, the reactors were intermittently aerated four times at 50-min intervals, 50 min each time. DO, pH and oxidation-reduction potential (ORP) in the reactors were real-time monitored. Four aeration rates-0.2 L air min −1 in SBR1 for 70 days, 0.4 L air min −1 in SBR1 for 50 days, 0.8 L air min −1 in SBR2 for 120 days and 1.2 L air min −1 in SBR1 for 110 days-were tested. When the aeration rate was 0.2 L air min −1 , the SBR was continuously anaerobic. When the aeration rate was 0.4 L air min −1 , COD and TP removals were 90% but TN removal was only 34%. When the aeration rates were 0.8 and 1.2 L air min −1 , average effluent concentrations were 115 mg COD L −1 , 19 mg TN L −1 and 0.7 mg TP L −1 , giving COD, TN and TP removals of 97%, 95% and 97%, respectively. It was found that partial nitrification followed by denitrification occurred in the intermittently aerated SBR systems.

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Section: Effects Of the Aeration Rate On The Overall Performance Of Imentioning

confidence: 99%

Effect of Aeration Rate on Nutrient Removal from Slaughterhouse Wastewater in Intermittently Aerated Sequencing Batch Reactors

Healy

Zhan

et al. 2008

Water Air Soil Pollut

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“…Application of OUR as a parameter to control the operation of the SBR system Studies on automatic control of conventional SBR systems using DO, pH and ORP probes have been carried out to enhance N and P removal and to reduce operational costs [16][17][18][19][20]. DO data are always used to identify the end point of nitrification and the early identification of the end point of nitrification can save the operation cost of aeration.…”

Section: Discussionmentioning

confidence: 99%

“…DO data are always used to identify the end point of nitrification and the early identification of the end point of nitrification can save the operation cost of aeration. Marsili-Libelli [19] proposed that when the curve of DO concentrations with respect to time levels off, i.e., dDO dt ¼ 0; nitrification ends. However, Li et al [10] found that the ammonium breakpoints where nitrification ends were not easily found on the profile of DO curves (at the breakpoints, DO curve did not level off); however, they found that, at the ammonium breakpoints,…”

Section: Discussionmentioning

confidence: 99%

Nitrogen removal from slaughterhouse wastewater in a sequencing batch reactor under controlled low DO conditions

Zhan

Healy

2008

Bioprocess Biosyst Eng

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The aim of this study was to examine nitrogen removal from slaughterhouse wastewater in a laboratory-scale sequencing batch reactor (SBR) operated at low dissolved oxygen (DO) levels under two aeration strategies: intermittent aeration (IA) and continuous aeration (CA). Under the IA strategy, during the aeration periods, the maximum DO was controlled at 10% saturation; under the CA strategy, in the first hour of the react phase, the DO was maintained at 10% saturation, and then it was kept at 2-3% saturation in the remaining react phase. Total nitrogen removals of up to 95 and 91% were achieved under the IA and CA aeration strategies, respectively. It is proposed that in situ measurement of oxygen utilization rates can be used to control the operation of SBRs for nitrogen removal.

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“…Due to highly nonlinear nature and time variations associated with the SBR process, along with fluctuations in hydraulics and components and possible equipment unreliability, a single control strategy based on multiple indirect parameters may not be successful, rather a strategy based on multivariate statistical process control analysis may be developed through further research [76,77]. Intelligent control strategy (ICS) such as fuzzy logic [78], expert system [79], and also artificial neural network (ANN) based model [80] has been used to effectively optimize the SBR processes. Intelligent control being the advanced form of real-time control strategy, it is going to be the future of SBR real-time control.…”

Section: Process Control Strategiesmentioning

confidence: 99%

Sequencing Batch Reactor for Wastewater Treatment: Recent Advances

2015

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Sequencing batch reactors (SBRs), due to its operational flexibility and excellent process control possibilities, are being extensively used for the treatment of wastewater which nowadays is fast becoming contaminated with newer and more complex pollutants. It is also possible to include different expanding array of configurations and various operational modifications to meet the effluent limits which are also continuously getting upgraded. This article provides basic description of SBR process along with its functional and physical variants that lead to improved the removal of nutrients and emerging contaminants. The significance of selectors and various recent advancements in the application of SBR has been discussed along with the possibilities held by SBR process in the treatment of wastewater of different origins and composition to produce effluent of reusable quality.

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Control of SBR switching by fuzzy pattern recognition

Cited by 51 publications

References 36 publications

Effect of Aeration Rate on Nutrient Removal from Slaughterhouse Wastewater in Intermittently Aerated Sequencing Batch Reactors

Effect of Aeration Rate on Nutrient Removal from Slaughterhouse Wastewater in Intermittently Aerated Sequencing Batch Reactors

Nitrogen removal from slaughterhouse wastewater in a sequencing batch reactor under controlled low DO conditions

Sequencing Batch Reactor for Wastewater Treatment: Recent Advances

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