Treatment of AMD using a combination of saw dust, bentonite clay and phosphate in the removal of turbid materials and toxic metals

Ntwampe, I. O.

doi:10.2166/wpt.2021.014

Cited by 5 publications

(4 citation statements)

References 33 publications

(40 reference statements)

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“…A1). Pulverization to optimal particle size plays a pivotal role as it liberates minerals bound together in complex inactive compounds to simple reactive minerals which stimulate physico-chemical reactions from the primary stage of destabilization-hydrolysis, adsorption, co-precipitation, inter-particle bridging and sedimentation (Ntwampe 2021a). Optimal turbidity reduction (Figure 1) suggests that plasticity and swelling which are the main properties of bentonite clay, including basicity and oxidation potential which characterise fly ash.…”

Section: Resultsmentioning

confidence: 99%

“…(Ntwampe 2013;Skoused 2014;Ntwampe et al 2015aNtwampe et al , 2015bNtwampe et al 2016;Ntwampe et al 2017a). Various challenges were identified from some of effective technologies whereas others exhibited high operating costs or requiring costly, sensitive and sophisticated equipment which requires highly technical and skilled manpower (Ntwampe 2021a). Based on afore-mentioned challenges, it is imperative to continue exploiting alternative reagents which are cost-effective in order to promote AMD treatment to the mining and chemical industries.…”

Section: Introductionmentioning

confidence: 99%

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Efficiency of a flocculent consisting of bentonite clay and fly ash for the removal of pollutants in AMD

Ntwampe

2022

Water Practice and Technology

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Acid mine drainage was collected from the western decant in Krugersdorp, South Africa to conduct a series of laboratory tests using 200 mL of AMD in five beakers dosed with increasing bentonite clay and decreasing pulverised fly ash respectively (flocculent-A) to establish accurate FA:BC dosing ratio. Two similar sets of experiments were conducted using a combination of bentonite clay and fly ash demineralized with distilled water (flocculent-B) and the other samples with tap water (flocculent-C). The pH, electrical conductivity (EC), turbidity and toxic metals were analyzed before and after experiments, i.e. As, Co, Zn and Pb, and treated in a jar test at 250 rpm for 2 min and reduced to 100 rpm for 10 min, allowed to settle for 1 hour after which the measurements were conducted. Turbidity removal of the samples of flocculent-A was slightly lower (72.5–75.1%) compared to that of flocculants-B and C (95.3–97.3%). On the other hand, FA:BC of 3:1 showed the highest turbidity removal. Toxic metals removal (85.9–94.8%) in the samples with a flocculent-B and C is also higher compared to that of flocculent A. The SEM micrographs of the samples with flocculent B and C showed large flocs indicating optimal sorption.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficiency of a flocculent consisting of bentonite clay and fly ash for the removal of pollutants in AMD

Ntwampe

2022

Water Practice and Technology

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“…The agent-clay/water interface is widely used in the treatment of water pollution, 57,58 soil heavy metal contaminatio, [59][60][61] and clay minerals flotation. 62,63 Inorganic flocculant is the most commonly used wastewater treatment reagent.…”

Section: Interactions Between Agents and Clay/water Interfacementioning

confidence: 99%

Application of molecular dynamics simulations in interface interaction of clay: Current status and perspectives

Chen

Chu

Cheng

et al. 2023

Asia-Pacific J Chem Eng

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To understand the research progress of molecular dynamics (MD) method in the field of clay minerals, the application of MD in the interface interaction of clay minerals is reviewed in this paper. MD simulations have become the indispensable means to study mineral interface effects. Clay minerals are common associated minerals with hydrophilic surface, the ease of argillization, negative electricity, and the ability of forming impurities and defects. They are widely concerned in the fields of mine wastewater treatment, fine clay mineral flotation, shale oil and gas exploitation, and so forth. In addition, clay minerals are considered as natural adsorbents due to their large specific surface area, but their complex interface interactions hinder their effective utilization. Therefore, it is particularly important to reveal the interaction mechanism of clay interface at the atomic/molecular level by means of software simulation technology. In this review, our focus is on the applications of MD method in the field of clay mineral interface interaction, such as clay/gas interface, clay/water interface, agents and clay/water interface, and mineral particle and clay/water interface. Furthermore, the history and shortcomings of MD simulation are summarized. The research and effective utilization of clay interface are summarized and prospected as well.

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“…Frequently used natural sorbents for heavy metal sorption include bentonites (Gitari, 2014) (Enslin et (Varvara et al, 2013) (Motsi, 2010a). Bentonites for sorption have also been used in mixtures with other materials to increase their e ciency (Ntwampe, 2023). Other materials with a con rmed Cd sorption effect include, for example, charcoal (Strugała-Wilczek et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cd and Mn from neutral mine effluents using bentonite, zeolite, and stabilized dewatered sludge

Prepilková,

Poništ,

Ďuricová

et al. 2024

Preprint

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This study aimed to investigate the adsorption efficiency of Cd and Mn using natural sorbents - bentonite, zeolite and stabilized digested dewatered waste sludge. The main contributions of the scientific article are in adding to the scientific knowledge of the use of natural and waste sorbents in the removal of heavy metals from neutral mine effluents. Current studies mainly focus on metal removal by sorption using natural sorbents from acid mine drainage. Our study investigates sorption in neutral mine drainage. The maximum efficiency of Mn removal by bentonite at the end of the test was approximately 90%. The removal of Mn by zeolite was considerably lower - about 20% compared to the use of sludge - 80%. Based on the sorption efficiency, the sludge was suitable for sorption. Much higher levels of Cd sorption were achieved using sludge compared to using natural bentonite and zeolite. The main novelty of the work lies in the sorption of metals using dewatered digested sludge. Previous studies have focused on metal sorption using activated sludge. Another novelty of our scientific paper is the comparison of the sorption of this waste sorbent with natural sorbents.

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Treatment of AMD using a combination of saw dust, bentonite clay and phosphate in the removal of turbid materials and toxic metals

Cited by 5 publications

References 33 publications

Efficiency of a flocculent consisting of bentonite clay and fly ash for the removal of pollutants in AMD

Efficiency of a flocculent consisting of bentonite clay and fly ash for the removal of pollutants in AMD

Application of molecular dynamics simulations in interface interaction of clay: Current status and perspectives

Adsorption of Cd and Mn from neutral mine effluents using bentonite, zeolite, and stabilized dewatered sludge

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