Avaliação do potencial de processos oxidativos avançados para remediação de águas contaminadas com geosmina e 2-MIB

Freitas, Adriane Martins de; Sirtori, Carla; Peralta‐Zamora, Patricio

doi:10.1590/s0100-40422008000100016

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…N overloads favor microalgae and water plant growth, which may release toxins into the water (von Sperling, 2005). Although non-toxic, geosmin and 2methylisoborneol (2-MIB), two products released by cyanobacteria, can influence drinking water organoleptic characteristics, representing an obstacle to water treatment (Freitas et al, 2008). In order to prevent eutrophication, wastewater treatment plants (WWTPs) must be improved to ensure that N loads to receiving water bodies are within the limits stipulated by local legislation (Yang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Nitrite build-up effect on nitrous oxide emissions in a laboratory-scale anaerobic/aerobic/anoxic/aerobic sequencing batch reactor

2021

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Biological wastewater treatment processes with biological nitrogen removal are potential sources of nitrous oxide (N2O) emissions. It is important to expand knowledge on the controlling factors associated with N2O production, in order to propose emission mitigation strategies. This study therefore sought to identify the parameters that favor nitrite (NO2-) accumulation and its influence on N2O production and emission in an anaerobic/aerobic/anoxic/aerobic sequencing batch reactor with biological nitrogen removal. Even with controlled dissolved oxygen concentrations and oxidation reduction potential, the first aerobic phase promoted only partial nitrification, resulting in NO2- build-up (ranging from 29 to 57%) and consequent N2O generation. The NO2- was not fully consumed in the subsequent anoxic phase, leading to even greater N2O production through partial denitrification. A direct relationship was observed between NO2- accumulation in these phases and N2O production. In the first aerobic phase, the N2O/NO2- ratio varied between 0.5 to 8.5%, while in the anoxic one values ranged between 8.3 and 22.7%. Higher N2O production was therefore noted during the anoxic phase compared to the first aerobic phase. As a result, the highest N2O fluxes occurred in the second aerobic phase, ranging from 706 to 2416 mg N m-2 h-1, as soon as aeration was triggered. Complete nitrification and denitrification promotion in this system was proven to be the key factor to avoid NO2- build-up and, consequently, N2O emissions.

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Section: Introductionmentioning

confidence: 99%

Nitrite build-up effect on nitrous oxide emissions in a laboratory-scale anaerobic/aerobic/anoxic/aerobic sequencing batch reactor

2021

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“…As GEO is detectable by consumers at very low levels, its presence has become a serious problem for water utilities (Chorus and Bartram 1999;Di Bernardo 1995). However, the methods currently used to remove GEO lack the desired efficiency and have high operational costs (Rittmann et al 1995;Terauchi et al 1995;De Freitas et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Geosmin induces genomic instability in the mammalian cell microplate-based comet assay

Silva

Lehmann

Dihl

2015

Environ Sci Pollut Res

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Geosmin (GEO) (trans-1,10-dimethyl-trans-9-decalol) is a metabolite that renders earthy and musty taste and odor to water. Data of GEO genotoxicity on mammalian cells are scarce in the literature. Thus, the present study assessed the genotoxicity of GEO on Chinese hamster ovary (CHO) cells in the microplate-based comet assay. The percent of tail DNA (tail intensity (TI)), tail moment (TM), and tail length (TL) were used as parameters for DNA damage assessment. The results demonstrated that concentrations of GEO of 30 and 60 μg/mL were genotoxic to CHO cells after 4- and 24-h exposure periods, in all parameters evaluated, such as TI, TM, and TL. Additionally, GEO 15 μg/mL was genotoxic in the three parameters only in the 24-h exposure time. The same was observed for GEO 7.5 μg/mL, which induced significant DNA damage observed as TI in the 24-h treatment. The results present evidence that exposure to GEO may be associated with genomic instability in mammalian cells.

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“…The poor quality of natural water is one of the most serious problems worldwide. In Brazil, around 90% of the population has access to drinking water of quality, but 47.8% of Brazilian municipalities still do not have sewage collection systems, and only 20.2% of those with such system have sewage treatment (FREITAS et al, 2008). Accordingly, efficient and easy-to-understand methods are needed to monitor water bodies.…”

Section: Introductionmentioning

confidence: 99%

“…Bioindicators are species chosen by their sensitivity or tolerance to a number of parameters, such as organic pollution or other types of pollutants (GOULART; CALLISTO, 2003). Since aquatic systems are subject to several disturbances, the aquatic biota reacts to both natural and anthropogenic stimuli (BUSS et al, 2003;SILVA et al, 2006;TOLEDO;NICOLELLA, 2002 Aquatic microorganisms present close and mandatory relationships with other organisms, and with physical and chemical conditions of the environment (RONQUI et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal distribution of nanoflagellates and bacterioplankton and relationship with environmental factors in a brazilian semi-arid reservoir

Amorim¹,

Araújo²

2012

Acta Sci. Biol. Sci.

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The semi-arid region of Rio Grande do Norte State, in northeast Brazil exhibits specific physical-climatic aspects: the climate is very hot, with mean annual rainfall of 550 mm, characterized by periodic drought and uneven distribution of rains. Due to these features, is important to study and preserve its water bodies. The purpose of this paper was to characterize and investigate bacterioplankton and heterotrophic nanoflagellates, and their seasonal variations in a reservoir located in the semi-arid region of Rio Grande do Norte State, in 2008. To this aim, four samplings were carried out in the rainy season and three in the dry season to determine the biotic and abiotic variables. Bacterial densities in the reservoirs ranged from 8.98 x 10 6 to 1.62 x 10 7 bac mL -1 , while total biomass varied between 207 and 262 μgCL -1 . The nanoflagellates showed a variation between 1,777 and 8,229 org mL -1 in density, and between 3.0 and 9.6 μgCL -1 in biomass. Statistical analyses presented non-standard results for both biological and physicalchemical variables throughout the study year, revealing the complexity of the reservoir with respect to the mechanisms controlling the microbial populations analyzed.Distribuição sazonal de nanoflagelados e do bacterioplâncton e relações com fatores ambientais em um reservatório do semiárido brasileiro RESUMO. O semiárido norterriograndense apresenta aspectos físico-climáticos bastante específicos: o clima é muito quente, com média pluviométrica de 550 mm ano -1 , caracterizado pelo regimento de escassez e desigual distribuição de chuvas. Por isso se torna imprescindível conhecer e preservar os seus corpos d'água. Este trabalho teve como objetivo a caracterização e o conhecimento sobre as comunidades bacterioplanctônica e de nanoflagelados heterotróficos e suas variações sazonais em um reservatório localizado na região semiárida do Estado do Rio Grande do Norte, durante o ano de 2008. Para isto, foram realizadas quatro coletas de amostras para verificar as variáveis bióticas e abióticas no período chuvoso e três no período seco. As densidades bacterianas nos reservatórios estudados variaram de 8,98 x 10 6 e 1,62 x 10 7 bac mL -1 , enquanto que as biomassas totais variaram de 207 a 262 μgCL -1 . Os nanoflagelados apresentaram variação de 1.777 e 8.229 org mL -1 na sua densidade e de 3,0 a 9,6 μgCL -1 na sua biomassa. As análises estatísticas apresentaram resultados não-padronizados tanto para as variáveis biológicas como para as físicoquímicas no decorrer do ano de estudo, revelando a complexidade do reservatório no que se refere aos mecanismos controladores das populações microbianas analisadas.Palavras-chave: microrganismos, açude, protozoários, variáveis abióticas.

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Avaliação do potencial de processos oxidativos avançados para remediação de águas contaminadas com geosmina e 2-MIB

Cited by 9 publications

References 14 publications

Nitrite build-up effect on nitrous oxide emissions in a laboratory-scale anaerobic/aerobic/anoxic/aerobic sequencing batch reactor

Nitrite build-up effect on nitrous oxide emissions in a laboratory-scale anaerobic/aerobic/anoxic/aerobic sequencing batch reactor

Geosmin induces genomic instability in the mammalian cell microplate-based comet assay

Seasonal distribution of nanoflagellates and bacterioplankton and relationship with environmental factors in a brazilian semi-arid reservoir

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