Aplicação de processo oxidativo avançado (POA) como pré-tratamento de efluente de laticínio para posterior tratamento biológico / Aplication of Advanced Oxidative Process (AOP) as pretreatment of dairy wastewater for subsequent biologic treatment

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

09/03/2009

RESUMO

The aim of this work is at developing a hybrid system in order to treat dairy wastewater. The hybrid system was composed by two modules. The first one is based in advanced oxidative process (AOP) and the second in actived sludge system (SLA). Methodologies from Standard Methods were adaptded and validated (BOD, COD, Norganic, N - NH4 +, Ptotal, Fe2+, G&O, TS, TFS, VSS, TSS, TDS, Al, As, Ca, Fe, Mg and Pb) for dairy effluent characterization. The best conditions for AOP and SLA processes had been determined through Designs of Experiments (DOE). The efficiency of both processes was avaliabled by COD. AOP treatment based on photocatalisis was applied. Titanium dioxide (TiO2) was used as semiconductor. This TiO2 was finely distributed and settled with poliuretanic ink on a plain metallic plate where the effluent was circulated on the respective located catalytic stream bed in fixed angle of 23º. This process (AOP) received direct solar radiation. Two types of crystalline structure of TiO2 (rutile or anatase) had been evaluated morphologically (XRD, BET, SEM-EDS) and kinetically, as an variable of photocatalisis process: the anatase crystalline phase in pH 5 have shown better degradation of dairy wastewater. The samples had been treated by SLA later photochemical reaction. The hybrid system (AOP - SLA) was then analyzed and optimized. 72 hours of biodegradation tests without AOP pretreatment had been shown 26,01 ± 5,23 % of COD reduction. Over optimized conditions the hybrid system showed 93,70 ± 0,10 % of COD reduction with a initial organic load of 3782,5 ± 37,6 mg O2 L-1 and final COD of 236,8 ± 0,1 mg O2 L-1 (treated effluent).

ASSUNTO(S)

advanced oxidative process dairy effluent dióxido de titânio efluente lácteo fotocatálise methodological optimization otimização metodológica photocatalisis processos oxidativos avançados titanium dioxide

ACESSO AO ARTIGO

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