Journal of Water Supply: Research and Technology—AQUA Vol 57 No 1 pp 57–63 © IWA Publishing 2008 doi:10.2166/aqua.2008.072
Pilot plan protocol for optimization of UV dose required to obtain an appropriate municipal wastewater disinfection
E. Nebot Sanz, J. M. Quiroga Alonso, J. A. Andrade Balao and I. Salcedo Dávila
Department of Chemical Engineering, Food Technologies and Environmental Technologies, University of Cadiz, Cadiz, Spain Tel.: 34 956 016198 enrique.nebot@uca.es
Aguas de Jerez, Empresa Municipal, S.A., Jerez de la Frontera, Spain
Environmental Engineering Division Hydraulics, Coastal and Environmental Engineering Department, Technical University of Catalonia, Barcelona, Spain
ABSTRACT
In this work a simple but comprehensive protocol for ultraviolet (UV) pilot plant studies was developed in order to meet the microbiological guidelines established by the Andalusian Regional Government (ARG) and Aguas de Jerez, Empresa Municipal, S.A. (AJEMSA). For this purpose, two pilot UV disinfection systems were tested at the municipal wastewater treatment plant in Jerez de la Frontera (Spain) over a period of thirteen months. Both pilot units were operated using unfiltered secondary wastewater. The results obtained from the pilot plant experiments suggest that an average UV dose of 50 mW s/cm2 is sufficient to meet required microbiological quality standards. The quality of the unfiltered wastewater shows that turbidity and total suspended solids could serve as good indicators for UV transmittance variations. The key parameters for an optimum protocol definition are temporal wastewater characterization, the planning and executing of UV disinfection experiments, determining the hydraulic behaviour of the UV channel, calculating the UV dose applied and, finally, evaluating experimental data.
Keywords: bacterial indicators; municipal wastewater; pilot plant; wastewater quality; water reuse; UV disinfection
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