Kinetics of dolomite dissolution in a packed bed by acidified desalinated water

Greiserman, Michael; Hasson, David; Semiat, Raphael; Shemer, Hilla

doi:10.1016/j.desal.2016.05.006

Cited by 15 publications

(7 citation statements)

References 19 publications

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“…The dissolution of dolomite is a function of pH, moreover, the fractionation of carbonate rocks is also influenced by water pH [ 34 ]. Greiserman [ 35 ] also reported similar observation where the dissolution of dolomite into calcium and magnesium ions were effective in acidic medium. These studies are in line with this current study that, high concentration of magnesium ions in water suggest non-optimal pH and that the availability of magnesium in water especially in groundwater system is influenced by pH.…”

Section: Discussionmentioning

confidence: 73%

Examining the dynamics of the relationship between water pH and other water quality parameters in ground and surface water systems

et al. 2022

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This study evaluated the relationship between water pH and the physicochemical properties of water while controlling for the influence of heavy metals and bacteriological factors using a nested logistic regression model. The study further sought to assess how these relationships are compared across confined water systems (ground water) and open water systems (surface water). Samples were collected from 100 groundwater and 132 surface water locations in the Tarkwa mining area. For the zero-order relationship in groundwater, EC, TDS, TSS, Ca, SO42-, total alkalinity, Zn, Mn, Cu, faecal and total coliform were more likely to predict optimal water pH. For surface water however, only TSS, turbidity, total alkalinity and Ca were significant predictors of optimal pH levels. At the multivariate level for groundwater, TDS, turbidity, total alkalinity and TSS were more likely to predict optimal water pH while EC, Mg, Mn and Zn were associated with non-optimal water pH. For the surface water system, turbidity, Ca, TSS, NO3, Mn and total coliform were associated with optimal water pH while SO42-, EC, Zn, Cu, and faecal coliform were associated with non-optimal water pH. The non-robustness of predictors in the surface water models were conspicuous. The results indicate that the relationship between water pH and other water quality parameters are different in different water systems and can be influenced by the presence of other parameters. Associations between parameters are steadier in groundwater systems due to its confined nature. Extraneous inputs and physical variations subject surface water to constant variations which reflected in the non-robustness of the predictors. However, the carbonate system was influential in how water quality parameters associate with one another in both ground and surface water systems. This study affirms that chemical constituents in natural water bodies react in the environment in far more complicated ways than if they were isolated and that the interaction between various parameters could predict the quality of water in a particular system.

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Section: Discussionmentioning

confidence: 73%

Examining the dynamics of the relationship between water pH and other water quality parameters in ground and surface water systems

et al. 2022

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“…Rocks and minerals are commonly used in various applications of environmental engineering. In water technology and protection, these are used as adsorbents and ion exchangers [1-5], filter media [6,7], remineralizing and deacidifying materials [8,9], coagulant aids [7], as well as substrates for the production of inorganic membranes [10][11][12] or sorbents for removal of petroleum substances [13]. In groundwater treatment, the filtration systems are a technical representation of the natural processes that occur between water components and rock material.…”

Section: Introductionmentioning

confidence: 99%

Mineral Materials Coated with and Consisting of MnOx—Characteristics and Application of Filter Media for Groundwater Treatment: A Review

et al. 2020

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For groundwater treatment, the technologies involving oxidation on MnOx filter bed are beneficial, common, and effectively used. The presence of MnOx is the mutual feature of filter media, both MnOx-coated mineral materials like quartz sand and gravel, chalcedonite, diatomite, glauconite, zeolite, or anthracite along with consisting of MnOx manganese ores. This review is based on the analysis of research and review papers, commercial data sheets, and standards. The paper aimed to provide new suggestions and useful information for further investigation of MnOx filter media for groundwater treatment. The presented compilations are based on the characteristics of coatings, methods, and conditions of its obtaining and type of filter media. The relationship between the properties of MnOx amendments and the obtained purification effects as well as the commonly used commercial products, their features, and applications have been discussed. The paper concludes by mentioning about improving catalytic/adsorption properties of non-reactive siliceous media opposed to ion-exchange minerals and about possible significance of birnessite type manganese oxide for water treatment. Research needs related to the assessment of the use MnOx filter media to heavy metals removal from groundwater in field operations and to standardize methodology of testing MnOx filter media for water treatment were identified.

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“…However, such application is both costly and in case of MgCl 2(s) the resulting added Cl − concentration surpasses the allowed Cl − threshold. Several processes have been suggested in recent years for supplying Mg 2+ to desalinated water, based on either dissolution of dolomite [5][6][7][8] or selective separation of Mg 2+ from seawater, where it exists at a relatively high concentration (typically above 1350 mg/L). The latter group includes a process for separating Mg 2+ from seawater via selective ion-exchange and transferring the Mg 2+ to the desalinated water by passing a Ca 2+ -rich solution originating from calcite dissolution, through the Mg-saturated resin [9]; nanofiltration-based Mg 2+ separation [10,11]; with or without adsorption of Mg(OH) 2(s) on the surface of Fe 3 O 4 [12] and processes based on diananofiltration as a rinsing method for reducing the NaCl background of the separated Mg-rich solution [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Implementation, Design and Cost Assessment of a Membrane-Based Process for Selectively Enriching Desalinated Water with Divalent Seawater Ions

2018

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The paper describes results from operating a new 3-step membrane-based process targeted at separating Mg2+ from seawater in an inexpensive way, with the purpose of using it to enrich desalinated water with magnesium, with as little as possible Cl− and Na+ addition. To this end, seawater undergoes a series of processes aimed at increasing the Mg2+ concentration from ~1350 to ~4000 mg/L through nanofiltration while the monovalent ion concentrations are reduced by a nanofiltration-diananofiltration sequence, in which the diluent is RO produced water from a desalination plant. A dense ultrafiltration (UF) step precedes the nanofiltration-diananofiltration (NF-DiaNF) cycles. In this step sulfate in seawater is rejected better than divalent cations hence the retentate of this step has a ratio of total hardness to sulfate (([Ca2+] + [Mg2+])/[SO42−] → 1) which enables attaining an almost complete washout of monovalent ions in the DiaNF step. The paper is concluded with presentation of general design of the process steps and a cost assessment, which shows the process to be both flexible in the quality of the rich Mg solution generated, and cost competitive, relative to other alternatives.

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Kinetics of dolomite dissolution in a packed bed by acidified desalinated water

Cited by 15 publications

References 19 publications

Examining the dynamics of the relationship between water pH and other water quality parameters in ground and surface water systems

Examining the dynamics of the relationship between water pH and other water quality parameters in ground and surface water systems

Mineral Materials Coated with and Consisting of MnOx—Characteristics and Application of Filter Media for Groundwater Treatment: A Review

Implementation, Design and Cost Assessment of a Membrane-Based Process for Selectively Enriching Desalinated Water with Divalent Seawater Ions

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