Development of online surrogate parameters using UV-VIS spectroscopy for water treatment plant optimisation: a study to explore the suitability of multiple wavelength UV absorption spectroscopy for online monitoring and process control
Date
2014
Authors
Byrne, A.J.
Brisset, T.
Chow, C.W.K.
Lucas, J.
Korshin, G.V.
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Journal article
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Water, 2014; 41(2):94-100
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Abstract
This study explored the suitability of multiple wavelength UV absorption spectroscopy as a tool for online monitoring and process control at water treatment plants. It included examination of variable water quality conditions created by the introduction of desalinated water into a conventional supply system. Absorbance data collected from an online UV absorption spectrophotometer was used to develop surrogate parameters for treatment process monitoring, control and optimisation. Surrogate parameters were developed via data analysis of collected online data as well as by targeted selection from previous research knowledge. These parameters were validated in the field using the same online spectrophotometer to gauge their response to events caused by operational changes, such as high chlorine demand and changes in natural organic matter (NOM). The response of the absorbance at 254 nm (A254) parameter to several operational events impacting water quality and optimal treatment (i.e. increases and decreases in chlorine demand) suggests that this parameter should be more widely adopted as an online monitoring tool. It was also found that novel parameters, such as the derivative of absorbance at 290 nm (A290) and the second derivative of absorbance at 310 nm (A310), appear to provide additional information to the standard A254, and may be useful for early detection of water quality changes and potentially useful tools for control of operational treatment processes. This study has demonstrated that chlorine control via online UV spectroscopic parameters may be a viable way to achieve this.
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Copyright 2014 Australian Water Association