Application of ORP Control for Nitrogen Removal in Highly Concentrated Activated Sludge Process

Lu, Shan; Imai, Tsuyoshi; Ukita, Masao; Sekine, Masahiko; Fukagawa, Masayuki; Nakanishi, Hiroshi

doi:10.1080/09593332108618146

Cited by 6 publications

(4 citation statements)

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“…Moreover, some study stopped the nitrification and denitrification process of a SBR system by setting the ORP values equal to 400 and 150 mV, respectively, using an optimized management of aeration by redox (OGAR) control system which utilizes on line redox (ORP) measurements to control the aeration process in an activated sludge process [38]. These empirical values were similar with the results of many studies [39][40][41].…”

Section: Empirical Valuessupporting

confidence: 79%

Progress in the Development of Control Strategies for the SBR Process

Yang

Peng

et al. 2010

CLEAN Soil Air Water

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Review Progress in the Development of Control Strategies for the SBR ProcessThe sequencing batch reactor (SBR) process has shown great success in the treatment of industrial wastewater from intermittent discharge factories and for the treatment of domestic wastewater from medium or small towns. As automation technology has developed, many studies have been conducted to determine the optimal conditions for the SBR process. This review outlines the progress and application of control strategies that have been developed for the SBR process and provides a summary and comparison of the advantages and disadvantages of various control strategies, especially fixed-time control strategies and various real-time control strategies. Moreover, an analysis and discussion of novel optimal control methods for biologic nutrient removal are provided. Although previous studies in this field have greatly enriched our understanding of SBR systems, it is clear that many unsolved problems remain. Therefore, a summary of unanswered questions regarding control strategies for the SBR process is provided and future research directions are suggested.

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Section: Empirical Valuessupporting

confidence: 79%

Progress in the Development of Control Strategies for the SBR Process

Yang

Peng

et al. 2010

CLEAN Soil Air Water

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“…This result is supported by the literature on the sewage treatment, where ORP is used as a measurement of the wastewaters' capacity to permit the occurrence of specific biochemical reactions. In particular, the ORP-based regulation is mainly applied for controlling activated sludge processes, such as the control of nitrification and denitrification processes (Klapwijk 1998;Lu et al 2000) and of nutrient removal conditions (Yu et al 1997;Li & Bishop 2002), but it is also applied for monitoring wastewater disinfection (Harp 2000). Moreover, in our study, the relationship described in Equation (2) can be considered reliable over the time in the full-scale plant because the nature of entering waters is not subjected to high fluctuations in the ORP.…”

Section: Identification Of a Predictive Variable For Paa Effectivenessmentioning

confidence: 92%

Approach to a water safety plan for recreational waters: disinfection of a drainage pumping station as an unconventional point source of fecal contamination

et al. 2020

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In the context of the management of bathing water quality, the intermittent contamination of rainwater drainage pumps (unconventional point sources) could be controlled by peracetic acid disinfection. Thus, a field experimental study was carried out to set up a water safety plan, determining the monitoring parameters and the critical limit for corrective actions. With a 0.5 mg/l dosage, the average logarithmic microbial reduction was 0.50 ± 0.48 for Escherichia coli (EC) and 0.43 ± 0.54 for intestinal enterococci. Among the chemical and physical parameters that could be monitored in real time, the oxidation–reduction potential was the only one able to predict the microbial concentration discharged from a drainage pump and the logarithmic abatement of EC. Considering the possible impact of this source on bathing waters in terms of additional risk of gastrointestinal infections, the critical limit for continuous monitoring was established using a quantitative microbial risk assessment (QMRA) model.

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“…On the other hand, several studies have been conducted on the problem of nitrogen removal, in which aerobic and anoxic environments are required in order to remove the reduced and oxidized nitrogen species (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). During the anoxic process, the oxidation-reduction potential, ORP, has been observed to undergo a change in rate upon complete removal of the oxidized nitrogen species.…”

Section: Introductionmentioning

confidence: 99%

“…ORP has been used on laboratory scale reactors to remove carbon, nitrogen, and phosphorus pollutants. It was found that the variations and the ORP profile can accurately represent dynamic characteristics of the system (7,8). Also, the breakpoints, set points, and set time on the ORP profiles are used to establish the real-time control strategy to determine the transfer of operation stages (9,10).…”

Section: Introductionmentioning

confidence: 99%

Oxidation‐Reduction Potential as a Control Variable for the Anaerobic Stage during Anaerobic‐Aerobic p‐Nitrophenol Degradation

Buitrón

Betancur

Moreno

et al. 2003

Biotechnology Progress

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Combined anaerobic-aerobic processes are a viable alternative for the treatment of xenobiotic compounds that are difficult to treat by traditional processes. The variable nature of the sequencing batch reactors, SBR, systems allows manipulation of the selective pressure on the microorganisms. Then, the activity of the community can be dynamically adjusted to meet changing effluents conditions. To improve the response of the SBR to changing influent conditions, several efforts have been made to automate and control the duration of the sequential phases of the SBR. The objective of this work is to present and discuss the feasibility of the use of the oxidation-reduction potential, ORP, as a control variable for the determination of the anaerobic phase length in an anaerobic-aerobic SBR used to degrade p-nitrophenol, PNP. The control of the anaerobic phase of the anaerobic-aerobic reactor was achieved with software developed at the Institute of Engineering-UNAM. During the anaerobic stage, the PNP is reduced to p-aminophenol, PAP. As a consequence of the compound transformation, there is a change in the oxidation-reduction potential of the culture medium. This change was used to indicate the minimal concentration of PNP and, as a consequence, the maximal PAP concentration. The feasibility of the algorithm for using the variations in the ORP to determine on-line the length of the anaerobic stage in an anaerobic-aerobic process was demonstrated in our laboratory.

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Application of ORP Control for Nitrogen Removal in Highly Concentrated Activated Sludge Process

Cited by 6 publications

References 0 publications

Progress in the Development of Control Strategies for the SBR Process

Progress in the Development of Control Strategies for the SBR Process

Approach to a water safety plan for recreational waters: disinfection of a drainage pumping station as an unconventional point source of fecal contamination

Oxidation‐Reduction Potential as a Control Variable for the Anaerobic Stage during Anaerobic‐Aerobic p‐Nitrophenol Degradation

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