The Removal of Alkylphenol Ethoxylate Surfactants in Activated Sludge Systems

Melcer, Henryk; Monteith, Hugh; Staples, Charles A.; Klečka, Gary M.

doi:10.2175/193864706783750051

Cited by 7 publications

(7 citation statements)

References 22 publications

(13 reference statements)

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“…This operating mode conserves the microorganisms that are responsible for the degradation of alkylphenol polyethoxylates and its metabolites, and prevents the discharge of high concentrations of suspended solids that may contain adsorbed alkylphenol polyethoxylate or its metabolites (Melcer et al, 2006). This operating mode conserves the microorganisms that are responsible for the degradation of alkylphenol polyethoxylates and its metabolites, and prevents the discharge of high concentrations of suspended solids that may contain adsorbed alkylphenol polyethoxylate or its metabolites (Melcer et al, 2006).…”

Section: Organic Load Ratementioning

confidence: 99%

Treatment of Micropollutants in Water and Wastewater

Virkutytė

Varma

2010

wio

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The Integrated Environmental Technology Series addresses key themes and issues in the field of environmental technology from a multidisciplinary and integrated perspective.An integrated approach is potentially the most viable solution to the major pollution issues that face the globe in the 21st century.World experts are brought together to contribute to each volume, presenting a comprehensive blend of fundamental principles and applied technologies for each topic. Current practices and the state-of-the-art are reviewed, new developments in analytics, science and biotechnology are presented and, crucially, the theme of each volume is presented in relation to adjacent scientific, social and economic fields to provide solutions from a truly integrated perspective.The Integrated Environmental Technology Series will form an invaluable and definitive resource in this rapidly evolving discipline.

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Section: Organic Load Ratementioning

confidence: 99%

Treatment of Micropollutants in Water and Wastewater

Virkutytė

Varma

2010

wio

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“…This behavior explains the multiple uses of surfactants in detergents, wetting agents, emulsifiers, foaming agents, and so forth. Surfactants are usually divided into three main categories: (a) nonionic surfactants, such as polyoxyethylene alcohols, alkyl ethers, and alkyphenol ethoxylates; (b) ionic surfactants which are classified as anionic, which usually contain sulfate and phosphate functional groups in the hydrophilic head, and cationic, which consist of quaternary ammonium and an amine-based hydrophilic head; and (c) zwitterionic surfactants which contain both positive (amine-based) and negative (carboxylic, sulfonic) charged groups …”

Section: Introductionmentioning

confidence: 99%

Promising Route for the Development of a Computational Framework for Self-Assembly and Phase Behavior Prediction of Ionic Surfactants Using MARTINI

2019

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Surfactants are amphiphilic molecules with multiple uses and industrial applications as detergents, wetting agents, emulsifiers, and so forth. They can be divided into three main categories: nonionic, ionic, and zwitterionic. The development of a universal computational framework able to predict key properties such as their critical micelle concentration (cmc) and the size of the micelles they form and to ultimately extract phase diagrams for their aqueous solutions, possibly in the presence of salts and oils, using their chemical constitution as input, would provide valuable information for the design and the production of these materials. In this work, we focus on ionic surfactants and investigate a possible route toward the development of such a framework based on coarse-grained simulations using the MARTINI forcefield in two versions: its implicit solvent version, called Dry MARTINI, and its explicit solvent version, called Wet MARTINI. The surfactants considered in our efforts are the anionic sodium dodecyl sulfate (SDS) and the three cationic cetyl, dodecyl, and octyl trimethyl ammonium bromide (CTAB, DTAB, and OTAB, respectively). First, we choose their mapping onto coarse-grained MARTINI beads. Next, we estimate their cmc’s, their peak aggregation numbers, N agg, and in the case of SDS, its small angle neutron scattering pattern at low concentrations, applying the Dry MARTINI forcefield. With a single modification to the Lennard-Jones energy parameter between hydrophobic beads and invoking Ewald summation with a physically meaningful dielectric constant for electrostatic interactions, our estimates are in very good agreement with experimental results. Furthermore, we predict the phase behavior of SDS/water and CTAB/water binary solutions using Wet MARTINI and find semiquantitative agreement with experimental phase diagrams. We conclude that the MARTINI forcefield, with careful treatment of electrostatic interactions and appropriate modification of parameters for some key functional groups, can be a powerful ally in the quest for a universal computational framework for the design of new surfactants with improved properties.

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“…Several species of Pseudomonas are known to biodegrade SDS [6,7]. On the other hand, the average concentration for several individual classes of anionic surfactants in wastewater can vary between 0.4 and 12 mg/L [8]. Surfactants' chemical structure and WWTP operating conditions play very important roles for removal of these materials from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Bioattenuation of Detergent Plant Effluents Enhanced via Single Microbial Augmentations

İçgen

Salik

Goksu

et al. 2016

J Surfact & Detergents

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Due to natural attenuation, anionic detergents in surface waters are not inferred as big environmental issues. However, the effluents from large industrial areas with high detergent concentrations can have significant local impacts. These circumstances can be diminished by using efficient detergent-degrading bacterial isolates through bioaugmentation. In this study, detergent plant effluents were analysed by using a methylene blue active substance assay to determine detergent content during natural attenuation processes, and after single augmentations of 12 anionic detergent-degrading bacterial isolates with high detergent tolerating abilities in batch microcosms. Maximum bioattenuation of detergents was determined as 56 % after 66 h incubation under the conditions that mimicked the natural environment. Bioattenuation was enhanced as much as 83 and 91 % in 78 h incubation time through single microbial augmentations of filter-sterilized and non-sterilized effluents, respectively. Eight Pseudomonas and one Aeromonas species were found to be highly competitive by showing high biodegradation abilities in pure culture experiments as well as enhancing degradation of detergents in both filter-sterilized and nonsterilized effluents through their single augmentations. Although remaining three isolates, namely Pseudomonas fluorescens SDS6, P. resinovorans SDS10-2, and P. corrugata SDS10-3 displayed lower degrading abilities in pure culture experiments than the natural attenuation, they later turned out to be actively enhancing the degradation of detergents during their single augmentations.

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The Removal of Alkylphenol Ethoxylate Surfactants in Activated Sludge Systems

Cited by 7 publications

References 22 publications

Treatment of Micropollutants in Water and Wastewater

Treatment of Micropollutants in Water and Wastewater

Promising Route for the Development of a Computational Framework for Self-Assembly and Phase Behavior Prediction of Ionic Surfactants Using MARTINI

Bioattenuation of Detergent Plant Effluents Enhanced via Single Microbial Augmentations

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