Water Resources Planning for the Senegal River Basin

Venema, Henry David; Schiller, Eric J.

doi:10.1080/02508069508686451

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…The enhancement solution contained 3 constituents: an anionic surfactant (sodium dodecanoate, SDD or sodium dodecyl sulfate, SDS) or nonionic surfactant (Pluronic F-127 or Pl), a well-known polymer used as a stabilizer or thickener (carboxymethyl cellulose, CMC or hydroxyethylcellulose, HEC) and a defoaming agent (lignosulfonic acid sodium salt or LAS). Enhancement solutions containing the specified or other surfactant(s) and/or polymer(s) have long been utilized or suggested for stabilizing suspensions for different applications. − The effectiveness of 5 different enhancement solution combinations on the stability of the adsorbent suspensions was investigated: A. CMC + SDD + LAS; B. HEC + SDD + LAS; C. CMC + SDS + LAS; D. HEC + SDS + LAS; and E. CMC + Pl + LAS, respectively. A control sample, that is, the adsorbent suspension without the enhancement solution, was also prepared.…”

Section: Methodsmentioning

confidence: 99%

Toward In Situ Sequestration of Multicomponent PFAS Using Injectable Adsorbent Suspensions

Umeh,

Stegh,

Naidu

2023

ACS EST Water

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The potential application of available adsorbents for in situ polyfluoroalkyl substances (PFAS) sequestration, including the release of previously sequestered PFAS under changing groundwater chemistries, was investigated using batch studies. Injectable adsorbent suspensions (IASs) were prepared from 2 anion-exchange resins (A-IXR and L-IXR), a powdered activated carbon, an activated charcoal, a surface-modified organoclay–carbon composite (NMC+ n ), and a carbonaceous-clay-organic material (ROAC). The IAS was amended to water-saturated sand after which multicomponent PFAS sorption and desorption with deionized water and simulated groundwater were investigated. PFAS sorption was instantaneous and chain-length-dependent, reaching approximately 100% in the IAS-amended sand, except for ROAC. In general, PFAS sorption isotherms were nonlinear, with larger sorption capacities of the long-chain than short-chain PFAS. The sorption capacity of the A-IXR (IAS) amendment was 2.5 times the capacities of the other amendments. In simulated groundwater (AGW), PFAS were released (5–100%) from the IAS amendments, especially from A-IXR, affecting mostly the short-chain PFAS and the perfluorocarboxylic acids. The release was attributed to anion exchange and electrical double-layer compression effects driven by the coexisting ions in AGW. Such a considerable release of short- and long-chain PFAS especially from anion-exchange resins should not be overlooked during decision-making regarding in situ PFAS sequestration.

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Section: Methodsmentioning

confidence: 99%

Toward In Situ Sequestration of Multicomponent PFAS Using Injectable Adsorbent Suspensions

Umeh,

Stegh,

Naidu

2023

ACS EST Water

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“…(Weissman, 1990). Water resources and irrigation (Barreteau and Bousquet, 2000), (Barreteau et al, 2004), (Lahtela, 2003), (Rasmussen et al, 1999), (Venema, 1996), (Venema and Schiller, 1995), (Venema et al, 1997). Health (Cohen, 1998), (Doerner et al, 2007), (Ju¨tting, 2004).…”

Section: Senegalmentioning

confidence: 99%

“…Transport (Behrens et al, 2006). (Van Duivenbooden, 1999), (Venema and Schiller, 1995), (Woodhouse, 2003). 5.13.…”

Section: Malimentioning

confidence: 99%

A bibliography of applications of operational research in West Africa

Smith¹

2008

Int Trans Operational Res

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There is considerable interest in the potential for using operational research (O.R.) in developing countries. One sign of this is the formation of new societies for O.R. scientists in countries and regions where no such society had existed. Since 2003, such societies have been formed in several parts of Africa. This paper focuses on West Africa, and presents a bibliography of papers relating to applications of O.R. in the nations of this part of the continent. The paper describes the way in which the bibliography was collated and discusses the overall picture that the list of papers presents of the state of O.R. in the 18 countries that are considered.

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“…It was meant to be used as a decision support and alternatives screening tool for assisting decision-makers and stakeholders involved in resolving conflicting issues associated with the management of international river basins (see Salewicz and Loucks, 1989;Venema and Schiller, 1995).…”

Section: Iris and Iras Modelling Systemsmentioning

confidence: 99%