Application of ion-sensitive sensors in water quality monitoring

Rieger, Leiv; Saracevic, Ernis; Pressl, Alexander; Gruber, Günter

doi:10.2166/wst.2004.0678

Cited by 37 publications

(33 citation statements)

References 5 publications

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“…Ex-situ meters require additional sampling device and proper sample preparation (usually filtration) before measurement itself, which increases the level of complexity of the measuring system and extends the time from sampling to obtain information. The specificity of mentioned measurement methods makes in-situ sensors more favourable due to lower operational and maintenance costs, however they require regular calibration and verification of their indications [21,22].…”

Section: On-line Monitoring For Wastewater Treatmentmentioning

confidence: 99%

One-stage deammonification start-up control using ion-selective electrodes (ISE) sensor

Miodoński

Muszyński-Huhajło

2017

E3S Web Conf.

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Abstract. Dynamic development of side-stream ammonia-rich streams treatment technologies creates need of new methods of control techniques. So far, most of available technologies are based on relatively simple sensors, such as pH probes. This article presents the results of an ion selective electrode used for controlling a one-stage deammonification process in the start-up period. Sensor applicability under alternating aerobic/anaerobic conditions and large fluctuations of measured substances concentrations was investigated. ISE probe was also used to verify Anammox bacteria response on elevated dissolved oxygen exposition at the beginning of the anaerobic phases preceded by aerobic phases.

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Section: On-line Monitoring For Wastewater Treatmentmentioning

confidence: 99%

One-stage deammonification start-up control using ion-selective electrodes (ISE) sensor

Miodoński

Muszyński-Huhajło

2017

E3S Web Conf.

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“…The use of ion-selective electrodes (ISEs) is feasible for real-time monitoring because they can be used to directly in the medium to be tested. Furthermore, ISEs are both compact and low cost (Kim et al, 2006;2007;2011;2013;Mimendia et al, 2010;Tang et al, 2012;Winkler et al, 2004). However, some concerns remain regarding the stability, repeatability, and selectivity of ISEs when continuous immersion of the electrodes in hydroponic solutions is required, such as that in a continuous, on-line system.…”

Section: Introductionmentioning

confidence: 99%

An Automated Water Nitrate Monitoring System based on Ion-Selective Electrodes

Cho¹,

Kim²,

Jung³

et al. 2016

Journal of Biosystems Engineering

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Purpose: In-situ water quality monitoring based on ion-selective electrodes (ISEs) is a promising technique because ISEs can be used directly in the medium to be tested, have a compact size, and are inexpensive. However, signal drift can be a major concern with on-line management systems because continuous immersion of the ISEs in water causes electrode degradation, affecting the stability, repeatability, and selectivity over time. In this study, a computer-based nitrate monitoring system including automatic electrode rinsing and calibration was developed to measure the nitrate concentration in water samples in real-time. Methods: The capabilities of two different types of poly(vinyl chloride) membrane-based ISEs, an electrode with a liquid filling and a carbon paste-based solid state electrode, were used in the monitoring system and evaluated on their sensitivities, selectivities, and durabilities. A feasibility test for the continuous detection of nitrate ions in water using the developed system was conducted using water samples obtained from various water sources. Results: Both prepared ISEs were capable of detecting low concentrations of nitrate in solution, i.e., 0.7 mg/L NO3-N. Furthermore, the electrodes have the same order of selectivity for nitrate:, and maintain their sensitivity by > 40 mV/decade over a period of 90 days. Conclusions: The use of an automated ISE-based nitrate measurement system that includes automatic electrode rinsing and two-point normalization proved to be feasible in measuring NO3-N in water samples obtained from different water sources. A one-to-one relationship between the levels of NO3-N measured with the ISEs and standard analytical instruments was obtained.

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“…Together with a short response time, this allows total data acquisition times of few seconds. Time and costs for operation and maintenance (O þ M) can also be significantly lower than for ex-situ analyzers (Winkler et al 2004). In-situ sensors however necessitate regular external calibration and quality control.…”

Section: Introductionmentioning

confidence: 99%

“…A cross-sensitivity of 1:100indicates that a concentration of 100 mg/l of the disturbance ion induces a potential difference equal to 1 mg/l of the measurement ion(Winkler et al 2004). Cross-sensitivity depends first on the total concentration of the disturbance ion, corrected by an offset, and then on the variations of that concentration, which requires an additional membrane for constant compensation.Two configurations were used in the pilot plant.…”

mentioning

confidence: 99%

Potential of in-situ sensors with ion-selective electrodes for aeration control at wastewater treatment plants

Kaelin

Rieger

Eugster

et al. 2008

Water Science and Technology

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A pilot-scale activated sludge wastewater treatment plant (WWTP) operated with nitrification and pre-denitrification was monitored with a set of on-line sensors for over 3 years. Wet-chemistry ex-situ analyzers, UV and UV-Visible in-situ sensors and in-situ sensors based on ion-selective electrodes (ISE) were used. New ISE sensors for ammonium, nitrate and nitrite, adapted to water and wastewater matrices, have been released in recent years, With adequate quality control they proved to be highly accurate and reliable in WWTP influents and activated sludge (AS) reactors even at the end of the biological treatment zone, working at low ammonium concentrations (1-2 mgN/l). The ammonium measurement was used to test several feed-forward and feed-back aeration control strategies. The first aim was to keep inorganic nitrogen compounds, i.e. ammonium, nitrate and particularly nitrite, as low as possible in the effluent, and within Swiss national standards (<2.0 mgNH(4)-N/l, <0.3 mgNO(2)-N/l, 24 h average). All the strategies were successful at keeping ammonium low and subsequently at gaining denitrification capacity to significantly reduce the total nitrogen discharge. Some control strategies however generated temporary peaks of ammonium or even accumulation of nitrite.

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Application of ion-sensitive sensors in water quality monitoring

Cited by 37 publications

References 5 publications

One-stage deammonification start-up control using ion-selective electrodes (ISE) sensor

One-stage deammonification start-up control using ion-selective electrodes (ISE) sensor

An Automated Water Nitrate Monitoring System based on Ion-Selective Electrodes

Potential of in-situ sensors with ion-selective electrodes for aeration control at wastewater treatment plants

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