Effect of dissolved silica on photocatalytic water purification with a TiO2 ceramic catalyst

Negishi, Nobuaki; Sugasawa, Masami; Miyazaki, Yukari; Hirami, Yuki; Koura, Setsuko

doi:10.1016/j.watres.2018.11.047

Cited by 22 publications

(7 citation statements)

References 35 publications

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“…Porém, o experimento MBR mostrou uma diminuição da eficiência de 100% para 40% no período de 15 dias de operação. Negishi et al (2019) avaliaram os efeitos do silicato de sódio (SiO3) em água em um fotocatalisador de cerâmica com TiO2, foi determinado os efeitos do SiO3 na taxa de degradação fotocatalítica do ácido fórmico (como um contaminante modelo) e na taxa de inativação fotocatalítica de Escherichia coli em solução aquosa. Tanto a taxa de degradação do ácido fórmico quanto a taxa de esterilização diminuiu com o aumento da concentração de SiO3.…”

Section: Poa's Utilizados No Tratamento De Efluentes Gerados Na Produção De Membranasunclassified

Processos oxidativos avançados aplicados no tratamento de efluentes da produção de membranas: revisão de literatura

Araújo

Souza

Sarmento

et al. 2021

RSD

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A aplicação de novas tecnologias e pesquisas em tratamento de águas são os caminhos para minimizar os impactos causados ao meio ambiente e melhoria dos recursos hídricos e, consequentemente, econômico e social de uma região. Dentre as tecnologias, se destacam os processos oxidativos avançados (POA’s), os quais são baseados na utilização de espécies altamente oxidantes para promover uma degradação mais eficaz do poluente a ser tratado. Este trabalho tem como objetivo realizar uma revisão dos POA’s, sendo eles: a fotocatálise com dióxido de titânio (TiO2)/ultravioleta (UV), foto-fenton e o peróxido de hidrogênio (H2O2)/UV, identificando os processos mais adequados de acordo com o poluente a ser tratado. Os POA’s se apresentam como uma opção para degradar os poluentes orgânicos que possuem elevada estabilidade química, devido à ineficiência de métodos comuns de tratamento de efluentes de difícil degradação. Além disso, os POA’s surgem como uma tecnologia onde apresenta uma maior eficiência no tratamento de efluentes a um baixo custo operacional. Portanto, os POA’s possuem um grande potencial para serem aplicados no tratamento de diversos efluentes obtidos a partir dos solventes utilizados na produção de membranas.

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Section: Poa's Utilizados No Tratamento De Efluentes Gerados Na Produção De Membranasunclassified

Processos oxidativos avançados aplicados no tratamento de efluentes da produção de membranas: revisão de literatura

Araújo

Souza

Sarmento

et al. 2021

RSD

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“…Also, PAOs such as Acetobacter (obligate aerobes), take in phosphorus in wastewater. Moreover, the concentrations of T-N, T-P, BOD, and COD tend to decrease because de-nitrification takes place and the BOD is consumed by microorganisms, such as Pseudomonas, Alcaligenes, and Hyphomicrobium [15][16][17]. The microorganisms observed using digital optical microscope (Olympus-BX51TRF) in the test process of water purification in this study are shown in Figure 10; these microorganisms induce phosphorus accumulation and denitrification [3].…”

Section: Water Purification Properties Of the Porous Concrete Producementioning

confidence: 99%

Strength and Water Purification Properties of Environment-Friendly Construction Material Produced with the (D)PAOs and Zeolite

Jang

Lee

2019

Applied Sciences

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The goal of this study was to improve the water purification performance of secondary concrete products that can be used in rivers and streams. To this end, mortar and porous concrete were produced by adding both de-nitrifying phosphate accumulating organisms ((D)PAOs) and zeolite, and their mechanical properties and water purification performance were analyzed. The compression strength test results showed that the strength was the highest when the mixing ratios of (D)PAOs and zeolite were set to 10% and 5%, respectively. For better contaminant adsorption, however, the optimal mixing ratio of zeolite was determined to be 10%. When the mixing ratio of (D)PAOs was set to 10%, the concentrations of biochemical oxygen demand (BOD) and chemical oxygen demand (COD) decreased by 57.9% and 89.9%, respectively, after seven days of immersion when compared to the initial concentrations. When compared to plain porous concrete, the total nitrogen (T-N) and total phosphorus (T-P) removal ratios of the develop concrete were 11.0% and 17.8% higher, respectively. When the mixing ratios of (D)PAOs and zeolite were set to 10% for both, the T-N and T-P removal ratios were determined to be 86.3% and 88.1%, respectively, while the BOD and COD concentrations were 2.668 mg/L and 16.915 mg/L, respectively. In simpler terms, the water purification performance was up to 17% higher in the concrete mixed with both 10% (D)PAOs and 10% zeolite than in the concrete mixed with 10% (D)PAOs only. Overall, the optimal mixing ratios of (D)PAOs and zeolite to maximize the water purification effect of secondary concrete products while maintaining their strengths equivalent to or higher than those of their corresponding plain concrete products are considered to be 10% for both.

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“…Scavenging processes can occur in the presence of species which react with OH radicals without leading to degradation, for example, bicarbonate ions (HCO 3 − ) [78] and chlorides [79] should be removed by a pre-treatment or the AOPs will be compromised. In particular, the interference role of bicarbonate, chloride and dissolved silica anions has been recently studied in depth [80][81][82]. Finally, most existing processes rely on TiO 2 as the catalyst material.…”

Section: Advanced Oxidation Processes and Photocatalysismentioning

confidence: 99%

Solar Concentration for Wastewaters Remediation: A Review of Materials and Technologies

et al. 2018

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As the effectiveness of conventional wastewater treatment processes is increasingly challenged by the growth of industrial activities, a demand for low-cost and low-impact treatments is emerging. A possible solution is represented by systems coupling solar concentration technology with advanced oxidation processes (AOP). In this paper, a review of solar concentration technologies for wastewater remediation is presented, with a focus on photocatalyst materials used in this specific research context. Recent results, though mostly on model systems, open promising perspectives for the use of concentrated sunlight as the energy source powering AOPs. We identify (i) the development of photocatalyst materials capable of efficiently working with sunlight, and (ii) the transition to real wastewater investigation as the most critical issues to be addressed by research in the field.

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Effect of dissolved silica on photocatalytic water purification with a TiO2 ceramic catalyst

Cited by 22 publications

References 35 publications

Processos oxidativos avançados aplicados no tratamento de efluentes da produção de membranas: revisão de literatura

Processos oxidativos avançados aplicados no tratamento de efluentes da produção de membranas: revisão de literatura

Strength and Water Purification Properties of Environment-Friendly Construction Material Produced with the (D)PAOs and Zeolite

Solar Concentration for Wastewaters Remediation: A Review of Materials and Technologies

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