Removal of mercury from aqueous solutions via polymer-enhanced ultrafiltration

Uludağ, Yusuf; Özbelge, H. Önder; Yılmaz, Levent

doi:10.1016/s0376-7388(96)00342-0

Cited by 117 publications

(66 citation statements)

References 22 publications

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“…Results from laboratory studies conducted by adding compounds to deionized water should be interpreted with caution because the presence of cations and NOM can alter removal efficiency. RO, NF, and charged UF membranes can remove inorganic EDCs (e.g., arsenic, perchlorate) (Uludag et al, 1997;Urase et al, 1997;Chianese et al, 1999;Vrijenhoek and Waypa 2000;Van der Bruggen et al, 2001;Yoon et al, 2002a). Overall, membrane separation provides an excellent barrier for most EDCs and PPCPs, except the lower molecular weight uncharged compounds.…”

Section: Membrane Separationmentioning

confidence: 99%

Pharmaceuticals, Personal Care Products, and Endocrine Disruptors in Water: Implications for the Water Industry

Snyder¹,

Westerhoff²,

Yoon³

et al. 2003

Environmental Engineering Science

803

371

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For over 70 years, scientists have reported that certain synthetic and natural compounds could mimic natural hormones in the endocrine systems of animals. These substances are now collectively known as endocrine-disrupting compounds (EDCs), and have been linked to a variety of adverse effects in both humans and wildlife. More recently, pharmaceuticals and personal care products (PPCPs) have been discovered in various surface and ground waters, some of which have been linked to ecological impacts at trace concentrations. The majority of EDCs and PPCPs are more polar than traditional contaminants and several have acidic or basic functional groups. These properties, coupled with occurrence at trace levels (i.e., ,1 mg/L), create unique challenges for both removal processes and analytical detection. Reports of EDCs and PPCPs in water have raised substantial concern among the public and regulatory agencies; however, very little is known about the fate of these compounds during drinking and wastewater treatment. Numerous studies have shown that conventional drinking and wastewater treatment plants can not completely remove many EDCs and PPCPs. Oxidation with chlorine and ozone can result in transformation of some compounds with reactive functional groups under the conditions employed in water and wastewater treatment plants. Advanced treatment technologies, such as activated carbon and reverse osmosis, appear viable for the removal of many trace contaminants including EDCs and PPCPs. Future research needs include more detailed fate and transport data, standardized analytical methodology, predictive models, removal kinetics, and determination of the toxicological relevance of trace levels of EDCs and PPCPs in water.Key words: endocrine disruptor; pharmaceutical; drinking water; wastewater; treatment; review 449 ENDOCRINE DISRUPTING COMPOUNDS P ERHAPS THE MOST DIFFICULT PART of understanding the subject of endocrine disruption involves a definition of the term. The Environmental Protection Agency (EPA) has defined environmental endocrine disrupting compounds (EDCs) as exogenous agents that interfere with the "synthesis, secretion, transport, binding, action, or elimi- nation of natural hormones in the body that are responsible for the maintenance of homeostasis, reproduction, development, and/or behavior" (EPA, 1997). However, definitions and opinions on what defines an EDC vary greatly. It is generally accepted that the three major classes of endocrine disruption endpoints are estrogenic (compounds that mimic or block natural estrogen), androgenic (compounds that mimic or block natural testosterone), and thyroidal (compounds with direct or indirect impacts to the thyroid). As we will illustrate, the majority of research thus far has focused only on estrogenic compounds; however, disruption of androgen and thyroid function may be of greater or equal importance biologically.Although the topic of endocrine disruption is considered an "emerging issue" in the water industry, scientists have known about the ability o...

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Section: Membrane Separationmentioning

confidence: 99%

Pharmaceuticals, Personal Care Products, and Endocrine Disruptors in Water: Implications for the Water Industry

Snyder¹,

Westerhoff²,

Yoon³

et al. 2003

Environmental Engineering Science

803

371

View full text Add to dashboard Cite

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“…These large molecules, having a larger molecular weight than the molecular weight cut off of the membrane, will be retained, while the non-complexed ions pass through the membrane. With this method, using different water-soluble polymers or introducing new functional groups to the polymer, it is possible to achieve selective separation and recovery of heavy metals with low energy requirements [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Removal of chromium ions from aqueous solutions by polymer-enhanced ultrafiltration

Aroua¹,

Zuki²,

Sulaiman³

2007

Journal of Hazardous Materials

291

130

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“…Similar results have been obtained by Müslehiddinoğlu et al [20] in the study of mercury and cadmium removal using polyethyleneimine as a complexing agent. Binding capacity of polymer for the metal ion can be defined as the critical loading ratio at which R value is 0.98 [21]. As can be seen in Fig.…”

Section: Effect Of Loading Ratio On the Extraction Of Co 2+mentioning

confidence: 99%

Experimental studies on extraction of cobalt ions from dilute aqueous solutions by using complexation-ultrafiltration process

Zeng

Liu

Nian-dong

2010

Front. Chem. Eng. China

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The extraction of cobalt ions from dilute aqueous solutions was investigated by ultrafiltration with the help of poly(acrylic acid) sodium salt (PAASS). Polysulfone and polyethersulfone hollow fiber ultrafiltration membranes were employed in this process. The kinetics of complexation reaction was studied for PAASS with Co 2+ . Results showed that, under a large excess of PAASS, it takes 65, 55 and 40 min at pH 5, 6 and 7, respectively, to get the equilibrium of complexation. The reaction kinetics can be described by a pseudo-first-order equation. Then, the effects of various parameters on the extraction of Co 2+ were examined in detail. Results indicated that loading ratio, pH value and low-molecular competitive complexing agent affect significantly cobalt rejection coefficient R. Furthermore, a concentration experiment was carried out at pH 7. With increasing volume concentration factor, membrane flux declines slowly, and R value is always about 1. The concentrated retentate was used further for a decomplexation experiment. The decomplexation ratio of cobalt-PAASS complex reaches as high as 90.1%. After the decomplexation step, a diafiltration experiment was performed at pH 2.5. Cobalt ions can be extracted satisfactorily from the retentate, and a purified PAASS is obtained.

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Removal of mercury from aqueous solutions via polymer-enhanced ultrafiltration

Cited by 117 publications

References 22 publications

Pharmaceuticals, Personal Care Products, and Endocrine Disruptors in Water: Implications for the Water Industry

Pharmaceuticals, Personal Care Products, and Endocrine Disruptors in Water: Implications for the Water Industry

Removal of chromium ions from aqueous solutions by polymer-enhanced ultrafiltration

Experimental studies on extraction of cobalt ions from dilute aqueous solutions by using complexation-ultrafiltration process

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