COMBINING A SEQUENCING BATCH REACTOR WITH HETEROGENEOUS PHOTOCATALYSIS (TiO2/UV) FOR TREATING A PENCIL MANUFACTURER'S WASTEWATER

Abstract

-A Sequencing Batch Reactor (SBR) was combined with heterogeneous photocatalysis (TiO 2 /UV) as a tertiary treatment for a pencil manufacturer's wastewater. The SBR removed almost all Chemical Oxygen Demand (COD) from the wastewater, although color was barely removed. Photocatalysis was optimized using a factorial design. Final COD, Dissolved Organic Carbon (DOC), and color removals were 95%, 80%, and 93%, respectively. Treated wastewater showed no ecotoxicity towards Lactuca sativa. Color removal kinetics (photocatalysis) followed a pseudo-first order model. The SBR + AOP (Advanced Oxidation Process, TiO 2 /UV) combination was a feasibility choice for removing both COD and color from this wastewater.

Combined photocatalytic and biological process for textile wastewater treatments

“…The success of the combined processes with TiO 2 is because they are complementary: The photocatalytic treatment removes color and the bioprocess removes carbon, improving the wastewater quality (Padovan & Azevedo, ). In addition, the photocatalytic pretreatment may improve the biodegradation of textile wastewater, though change the structures of the components, as observed by Ahmadi et al ().…”

“…Azo dyes, one class widely used in the textile industry, have high chemical and photolytic stabilities, making them recalcitrant, mutagenic, and difficult to remove using only one treatment method (Su, Low, Teng, & Wong, ). In the face of increasingly severe environmental legislation and growing consumer awareness, researchers haves focused on developing new strategies using a combination of treatment methods for more technical and economical alternatives (Padovan & Azevedo, ; Su et al, ).…”

Estudo Do Tratamento De Água De Um Igarapé De Manaus Utilizando Um Reator Fotocatalítico Heterogêneo Solar

“…(Velloso, 2002). No igarapé do Quarenta foram observados vários indicadores de poluição das águas como o aumento do pH, alta condutividade, baixos teores de oxigênio dissolvido, altas concentrações de cátions e ânions e altas concentrações de metais (Cu, Cr, Zn e Ni) (Melo et al, 2005 (Soares et al, 2007;Padovan e Azevedo, 2015;Santos et al, 2006). A fotocatálise heterogênea é o processo que envolve reações redox induzidas pela radiação na superfície de semicondutores como, por exemplo, o TiO 2 que é um material grandemente empregado na degradação de poluentes devido ao seu baixo custo, alta estabilidade contra fotocorrosão e baixa reatividade (Nogueira e Jardim, 1996).…”

Photocatalytic oxidation of 17 -Ethinylestradiol by UV-activated TiO2 in batch and continuous-flow reactor

“…In this liquid waste, EE2 can be found at a concentration of 5 mgL -1 (Nasuhoglu et al, 2012 The degradation of this compound has garnered attention, and several studies have utilized adsorption Ma et al 2016), biological (Larcher et al, 2013;Yi et al, 2011) and advanced oxidation processes for this purpose (Solcova et al, 2016;Pešoutová et al, 2014;Pessoa et al, 2014). Among these processes, advanced heterogeneous oxidation processes have been successfully used to remove water pollutants (Padovan and Azevedo, 2015;Gotostos et al, 2014;Miranda et al, 2013).…”