The role of NOM fouling for the retention of estradiol and ibuprofen during ultrafiltration

Jermann, Doris; Pronk, Wouter; Boller, Markus; Schäfer, A.I.

doi:10.1016/j.memsci.2008.12.016

Cited by 103 publications

(52 citation statements)

References 44 publications

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“…Estudos recentes demonstram que o fenômeno de fouling associado à presença de ácidos húmicos e polissacarídeos aumenta significativamente a retenção de estradiol em processos de ultrafiltração. 10 Este tipo de efeito é particularmente importante na filtração de amostras mais complexas, como águas naturais e esgoto. Neste caso, fenômenos de clogging e fouling são bastante comuns, 11 o que limita o volume de amostra, aumenta o tempo de filtração e diminui a capacidade de recuperação de certos micropoluentes.…”

Section: Resultsunclassified

Considerações sobre o preparo de amostras contendo micropoluentes estrogênicos

Liz

Nagata²,

Peralta‐Zamora³

2012

Quím. Nova

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Recebido em 8/7/11; aceito em 23/12/11; publicado na web em 23/3/12 CONSIDERATIONS ABOUT THE PREPARATION OF SAMPLES CONTAINING ESTROGENIC MICROPOLLUTANTS. In this work, the materials used in the recovery of estrogens from aqueous matrices by filtration and solid phase extraction were evaluated. The results showed that glass-fiber filters allow a recovery and repeatability compatible with this type of analysis, whereas cellulose esters lead to significant losses of the analytes, mainly due to adsorption processes. On the other hand, the transferring of the sample to the extraction cartridges should be carried out with glass or Teflon tubing, since the adsorption observed with other polymeric materials (eg. silicone, Tygon, polyethylene and PVC) dramatically reduces the recovery and repeatability of the extraction process.Keywords: estrogens; filtration; solid-phase extraction. INTRODUÇÃOA análise de micropoluentes em matrizes complexas provavelmente representa um dos maiores desafios da Química Analítica, principalmente em razão da essencialidade de uma longa sequência de operações preliminares que objetivam a purificação e a pré--concentração das espécies de interesse, mesmo quando se utilizam sistemas de quantificação cada vez mais seletivos e sensíveis (por exemplo, técnicas cromatográficas acopladas a espectrômetros de massas). 1,2 Embora grande parte destes procedimentos possa ser aplicada com relativa facilidade, a análise de micropoluentes em fase aquosa se apresenta bastante complexa, principalmente em função da possibilidade de perdas da espécie de interesse em cada uma das operações que fazem parte da rotina analítica. Em razão das baixas concentrações usualmente determinadas, o acúmulo de perdas pode redundar em baixa recuperação das espécies de interesse, inviabilizando a análise pretendida.Em publicação recente, 3 foram discutidos os principais problemas encontrados na determinação de micropoluentes em amostras de água, particularmente a ocorrência de contaminações que levam a resultados falso-positivos e de perdas associadas à obtenção de resultados falso-negativos. Dentro do contexto dos problemas de contaminação salientam-se contribuições das etapas de coleta, armazenamento e transporte; das condições ambientais do laboratório, da qualidade dos equipamentos e insumos utilizados e, ainda, de contaminações associadas à manipulação por parte do analista, enquanto que em relação às perdas de espécies de interesse salienta-se a capacidade de recuperação das técnicas de extração, as quais costumam ser fortemente influenciadas pela composição da matriz.Neste trabalho são apresentadas algumas evidências experimentais que demonstram a necessidade de cuidados especiais na seleção de materiais utilizados na manipulação de amostras destinadas à determinação de micropoluentes, tomando como exemplo a extração em fase sólida e a determinação cromatográfica de estrogênios em solução aquosa.Recentemente foram publicados três trabalhos que discutem o efeito da natureza dos meios filtrantes na recuperação de estrogê...

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Section: Resultsunclassified

Considerações sobre o preparo de amostras contendo micropoluentes estrogênicos

Liz

Nagata²,

Peralta‐Zamora³

2012

Quím. Nova

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“…However, micropollutants can be removed via interaction with natural organic matter (NOM) or adsorption onto membrane polymers. Jermann et al (2009) investigated the removal efficiencies of ibuprofen and estradiol by UF without existing the NOM. In hydrophilic UF membrane, elimination rate of ibuprofen and estradiol were found negligible and 8 % respectively.…”

Section: Membrane Processesmentioning

confidence: 99%

Treatment Alternatives for Micropollutant Removal in Wastewater

Nas¹,

Dolu²,

Ateş³

et al. 2017

Scitech

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Present of micropollutants in aquatic environments has become an alarming environmental problem for both living creatures and environment. Micropollutants, also called as emerging contaminants arise from natural substances and increasing variety of anthropogenic events. Micropollutants consist of pharmaceuticals, personal care products, steroid hormones, industrial chemicals, pesticides, polyaromatic hydrocarbons and other recently seen compounds. These emerging contaminants are commonly found in very low concentration in different water bodies ranging from a few ng/l to several μg/l. Many existing Wastewater Treatment Plants (WWTPs) in all over the world are not especially designed for removing micropollutants. Low concentration and diversity of micropollutants complicate the dedection and analysis procedures during the treatment processes. Furthermore, entering micropollutants to the WWTPs continuously and stable structure of many micropollutants make difficult to eliminate these emerging compounds sufficiently. Therefore, many micropollutants of unknown concentration pass to aquatic environment from WWTPs. The occurence of micropollutants with a significant levels in aquatic environments disrupt the aquatic ecosystems with a number of adverse effects including short-term and long-term toxicity such as endocrine disrupting effects. Besides the known negative effects of micropollutants there are great number of micropollutants whose effects on living organisms are still unknown. As a result, removing these compounds is of a great importance both to protect environmental ecosystem and human health. Considering that the conventional methods are insufficient for removing the micropollutants other alternative treatment methods including coagulation-flocculation, activated carbon adsorption (powdered activated carbon and granular activated carbon), advanced oxidation processes (AOPs), membrane processes and membrane bioreactor can be applied for better removal. In this study, alternative treatments methods and removal efficiencies of each treatment methods on different micropollutants were investigated and all alternative treatment methods were compared between each other in terms of micropollutant removal rates.

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“…Membrane material can also have a significant influence on adsorption [11]. For example, Jermann et al [12] observed up to 80% adsorption of estradiol to polyethersulfone ultrafiltration (UF) membranes compared to only 8% adsorption to regenerated cellulose UF membranes.…”

Section: Introductionmentioning

confidence: 99%

“…Within the literature, reports on the influence of solute-foulant interactions appear to be highly variable and dependent on properties of the micropollutant, such as charge and molecular weight, as well as organic matter properties and membrane material. Several studies have attributed improved steroidal hormone removal in the presence of organic matter to solute-foulant interactions [10,12]. Three main mechanisms can influence micropollutant removal in fouled membranes including concentration polarisation, pore blocking and adsorption to the fouling layer [13].…”

Section: Introductionmentioning

confidence: 99%

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Quantification of solute–solute interactions in steroidal hormone removal by ultrafiltration membranes

Neale¹,

Schäfer²

2012

Separation and Purification Technology

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Micropollutant removal by membrane filtration is variable and can be influenced by the presence of organic matter. When considering removal mechanisms, many studies have focused on membrane adsorption and solute-foulant interactions; however, little is known regarding the influence of solute-solute interactions as these are typically difficult to quantify. In this study experimental organic matter-water partition coefficients (K OM ) were applied to quantify and elucidate the influence of solute-solute interactions for steroidal hormone removal by ultrafiltration. The results indicated that the removal of all hormones increased in the presence of organic matter and this was related to hormone -organic matter interactions. Organic matter did not increase membrane adsorption or cause significant fouling for most molecular weight cut-off (MWCO) membranes, thus solute-solute interactions were the dominant mechanism for hormone removal as expected from previous quantification of such interactions using a specifically developed solid-phase microextraction (SPME) technique. While quantification was only partially successful at low organic carbon concentrations, clear evidence of the importance of solute-solute interactions was demonstrated in concentration studies. Experimental removal and estimated removal due to solutesolute interactions for estrone was comparable at high organic matter concentrations of 25-50 mgC/L for both 10 (48-52%) and 100 kDa (33-38%) membranes, suggesting that organic matter concentration was an important factor in solute-solute interactions. This study represents the first time that experimental organic matter-water partition coefficients have been applied to assess solute-solute interactions in membrane filtration, specifically ultrafiltration.Keywords: Ultrafiltration, organic matter, steroidal hormone, solute-solute interaction, partition coefficient 2 Introduction The detection of micropollutants, such as pharmaceuticals, pesticides and steroidal hormones, in effluent from conventional wastewater treatment plants has generated worldwide interest over the last few decades [1,2]. This is of concern as many of these micropollutants are considered endocrine disrupting chemicals and can have implications for the growth and development of organisms. For example, the presence of steroidal hormones, such as estradiol and estrone, can cause reproductive disruption in fish at sub nanogram per litre (ng/L) concentrations [3]. Consequently, there is a need for improved micropollutant removal during water and wastewater treatment and this has led to increasing interest in advanced water treatment processes, such as membrane filtration. The removal of micropollutants by membranes is variable and the presence of organic matter, which is ubiquitous in surface and wastewaters, can affect removal [4][5][6]. To better understand the influence of organic matter on micropollutant removal by membrane filtration three mechanisms of interaction interplay, namely membrane adsorption, solute-foulant intera...

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The role of NOM fouling for the retention of estradiol and ibuprofen during ultrafiltration

Cited by 103 publications

References 44 publications

Considerações sobre o preparo de amostras contendo micropoluentes estrogênicos

Considerações sobre o preparo de amostras contendo micropoluentes estrogênicos

Treatment Alternatives for Micropollutant Removal in Wastewater

Quantification of solute–solute interactions in steroidal hormone removal by ultrafiltration membranes

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