A titrimetric respirometer measuring the nitrifiable nitrogen in wastewater using in-sensor-experiment

Yuan, Zhiguo; Bogaert, Herwig

doi:10.1016/s0043-1354(00)00251-7

Cited by 19 publications

(7 citation statements)

References 10 publications

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“…This measuring principle has been developed and applied to the on-line measurement of the nitrification rate in activated sludge (Gernaey et al, 1997), the on-line measurement of the ammonium concentration (Gernaey et al, 1997;Massone et al, 1998) and the detection of toxic effects of wastewater and chemical compounds (Gernaey et al, 1999b;Rozzi et al, 1999). Yuan and Bogaert (2001) applied a titrimetric respirometer to measure nitrifiable nitrogen concentrations.…”

Section: Titrimetric Sensormentioning

confidence: 99%

On-line monitoring equipment for wastewater treatment processes: state of the art

Vanrolleghem

Lee

2003

Water Science and Technology

166

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A (non-exhaustive) survey of new and existing technologies for the monitoring of wastewater treatment plants is presented. Emphasis is given to the way these sensors can provide insight in the ongoing (bio-) processes. Three different uses for sensors can be found: for monitoring (operator support), in automatic control systems and as tools for plant auditing/optimization/modelling by consultants. From this, sensors have been classified in two basic types: (i) reliable, simple and low maintenance sensors for day-to-day monitoring and control and (ii) advanced, higher maintenance sensors that are used in auditing, model calibration and optimisation. The paper is organized according to the typical unit processes of biological wastewater treatment systems: anaerobic digestion, activated sludge, nutrient removal and sedimentation. Attention is drawn to a number of practical problems associated with the use of sophisticated sensors in the harsh (dirty) conditions of wastewater treatment processes. The use of autocalibration and built-in sensor checks, cleaning systems and reliable sample preparation units is illustrated. The paper ends with a discussion of the applicability of the different sensors.

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Section: Titrimetric Sensormentioning

confidence: 99%

On-line monitoring equipment for wastewater treatment processes: state of the art

Vanrolleghem

Lee

2003

Water Science and Technology

166

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“…Many researchers applied respirometric measurements [2][3][4][5][6] and titrimetry measurements [7][8][9][10] during activated sludge model calibration. Moreover, researchers emphasized the application of combined respirometric-titrimetric measurements for precise model parameter estimation [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Modeling urea biodegradation in activated sludge using combined respirometric–titrimetric measurements

Hoque¹,

Aravinthan

2011

Desalination and Water Treatment

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ab s t r ac tUrea biodegradation kinetics determination has been performed in the literature using a two-step nitrification model that was calibrated using on-line respirometric measurements. However, the model neglected the initial hydrolysis step that converts urea to carbon dioxide and ammonia nitrogen, and assumed constant carbon dioxide transfer rate (CTR), though it is inherently a nonlinear process which has an impact on the titrimetric modeling. Hence, in this paper, it is aimed to propose a complete two-step nitrification model for urea biodegradation paying attention to urea degradation pathway along with due consideration given for non-linear CTR process occurring in activated sludge system. Experiments were performed in a simple batch reactor equipped with respirometric and titrimetric set-up. Three different initial urea concentrations were added to the reactor for investigating the process kinetics. Proposed model was successfully calibrated with respirometric, titrimetric and combined respirometric-titrimetric measurements; and the estimated parameters were compared for model evaluation. Furthermore, the proposed model was validated with off-line ammonium, nitrite and nitrate measurements. The study revealed that urea was hydrolyzed at a faster rate in liquid phase. The maximum growth rates of the Nitrosomonas species and the Nitrobacter species were found to be 0.065-0.1 d -1 and 0.006-0.008 d -1 respectively.

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“…In particular, pH/DO-stat titration allows the assessment of two kind of information of great interest for monitoring N-removal processes: † biological treatability of the influent, as it allows the assessment of toxicity and/or inhibitory effects on the biomass (e.g. : Massone et al 1998;Ficara & Rozzi 2001Yuan & Bogaert 2001;Rozzi et al 2004); † biomass treatment capacity, in terms of process rate (e.g. Ramadori et al 1980;Massone et al 1996;Bogaert et al 1997;Gernaey et al 1998;Ficara et al 2000;Foxon et al 2002;Petersen et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Automatic set-point titration for monitoring nitrification in SBRs

Fiocchi

Ficara

Bonelli

et al. 2008

Water Science and Technology

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Nitrification is usually the bottleneck of biological nitrogen removal processes. In SBRs systems, it is not often enough to monitor dissolved oxygen, pH and ORP to spot problems which may occur in nitrification processes. Therefore, automated supervision systems should be designed to include the possibility of monitoring the activity of nitrifying populations. Though the applicability of set-point titration for monitoring biological processes has been widely demonstrated in the literature, the possibility of an automated procedure is still at its early stage of industrial development. In this work, the use of an at-line automated titrator named TITAAN (TITrimetric Automated ANalyser) is presented. The completely automated sensor enables us to track nitrification rate trend with time in an SBR, detecting the causes leading to slower specific nitrification rates. It was also possible to perform early detection of toxic compounds in the influent by assessing their effect on the nitrifying biomass. Nitrifications rates were determined with average errors+/-10% (on 26 tests), never exceeding 20% as compared with UV-spectrophotometric determinations.

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A titrimetric respirometer measuring the nitrifiable nitrogen in wastewater using in-sensor-experiment

Cited by 19 publications

References 10 publications

On-line monitoring equipment for wastewater treatment processes: state of the art

On-line monitoring equipment for wastewater treatment processes: state of the art

Modeling urea biodegradation in activated sludge using combined respirometric–titrimetric measurements

Automatic set-point titration for monitoring nitrification in SBRs

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