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Type: Artigo
Title: Urban water reuse: microbial pathogens control by direct filtration and ultraviolet disinfection
Author: Isaac, Ricardo de Lima
Santos, Luciana Urbano dos
Tosetto, Mariana S.
Franco, Regina Maura Bueno
Guimarães, José Roberto
Abstract: Physicochemical treatment efficiency for unrestricted urban water reuse was evaluated at a conventional activated-sludge wastewater treatment plant (WWTP). Pilot plant set-up consisted of an alum coagulation step, granular media upflow flocculation and direct downflow dual-media filtration followed by ultraviolet disinfection (dose of 95 mJ cm−2). Optimum aluminum sulfate dosage of 10 mg L−1 and coagulation pH 7.0 were preset based on bench scale tests. Under WWTP stable operation, water quality met United States Environmental Protection Agency (USEPA) suggested guidelines for unrestricted urban reuse regarding turbidity (mean value 1.3 NTU) and suspended solids (mean value 2.1 mg L−1). When WWTP overall plant performance dropped from 90 to 80% (although BOD value stayed below 6 mg O2 L−1, suggesting unrestricted reuse), solids breakthrough in filtrate was observed. Microorganism removal rates were: total coliforms 60.0%, Escherichia coli 63.0%, Giardia spp. 81.0%, and helminth eggs 62.5%; thus organisms still remained in filtrate. Ultraviolet (UV) disinfection efficiency was 4.1- and 3.8-log for total coliforms and E. coli, respectively. Considering low UV efficiency obtained for helminths and the survival of protozoa and helminths in the environment, effluent quality presents risk to public health if destined for unrestricted urban reuse
Subject: Helminto
Águas residuais - Purificação
Country: Reino Unido
Editor: IWA Publishing
Rights: Fechado
Identifier DOI: 10.2166/wh.2014.221
Date Issue: 2014
Appears in Collections:IB - Artigos e Outros Documentos
FEC - Artigos e Outros Documentos

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