Disinfection plays a key role in complying with microbiological quality standards in case of wastewater reuse. Among chemical disinfectants, peracetic acid (PAA) is a valid alternative to the commonly-used chlorine, thanks to its high spectrum of biocidal activity, the absence of halogenated disinfection by-product (DBPs) and the easy retrofitting of existing structures [1]. Anyway, it is affected by strong decay during the disinfection contact time which significantly depends on water quality [2]. The presence of suspended solids (SS) has proved to influence PAA disinfection in different ways: (i) enhancing PAA decay rate and (ii) promoting protection mechanism to bacteria [3]. The quantification of SS and microbiological enumeration by laboratory procedures requires many hours, consequently the development of real-time monitoring sensors is spreading in wastewater treatment plant (WWTP). In the present research, a modelling framework for describing involved phenomena (PAA decay, bacterial inactivation) and accounting for system uncertainty by stochastic tools is developed and adapted to process real-time water quality monitoring data. The final goal is to assess the efficacy of recently developed sensors to evaluate the effect of SS on PAA decay and, consequently, on the overall performance of PAA on E. coli inactivation, in the view of real-time control.

Integrated use of real-time sensors and process modelling to optimize wastewater disinfection by peracetic acid

Jacopo Foschi;Matteo Cascio;Andrea Turolla;Manuela Antonelli
2019-01-01

Abstract

Disinfection plays a key role in complying with microbiological quality standards in case of wastewater reuse. Among chemical disinfectants, peracetic acid (PAA) is a valid alternative to the commonly-used chlorine, thanks to its high spectrum of biocidal activity, the absence of halogenated disinfection by-product (DBPs) and the easy retrofitting of existing structures [1]. Anyway, it is affected by strong decay during the disinfection contact time which significantly depends on water quality [2]. The presence of suspended solids (SS) has proved to influence PAA disinfection in different ways: (i) enhancing PAA decay rate and (ii) promoting protection mechanism to bacteria [3]. The quantification of SS and microbiological enumeration by laboratory procedures requires many hours, consequently the development of real-time monitoring sensors is spreading in wastewater treatment plant (WWTP). In the present research, a modelling framework for describing involved phenomena (PAA decay, bacterial inactivation) and accounting for system uncertainty by stochastic tools is developed and adapted to process real-time water quality monitoring data. The final goal is to assess the efficacy of recently developed sensors to evaluate the effect of SS on PAA decay and, consequently, on the overall performance of PAA on E. coli inactivation, in the view of real-time control.
2019
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1099533
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