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Browsing by Author "Masindi, Vhahangwele"

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Adsorption of chromium species from industrial effluent using magnesium-bentonite clay composite: kinetics, equilibrium and risk assessment study

Author: Tjia, FH ; Ramakokovhu, MM ; Masindi, Vhahangwele Date: Jul 2017 To counter for pollution hazards imposed by anthropogenic activities on the environment, government, national and international scientific communities are in a quest to find pragmatic chromium depollution techniques. More prevalently, chromium ... Read more
Adsorption of phosphate from municipal effluents using cryptocrystalline magnesite: complementing laboratory results with geochemical modelling

Author: Masindi, Vhahangwele ; Gitari, WM ; Pindihama, KG Date: Nov 2015 The use of low-cost and locally available material in the treatment of wastewater has recently become an issue of interest, and magnesite as a low-cost material has been used for the removal of heavy metals in wastewater and has also shown ... Read more
Advocating circular economy in wastewater treatment: Struvite formation and drinking water reclamation from real municipal effluents

Author: Mavhungu, A ; Masindi, Vhahangwele ; Foteinis, S ; Mbaya, R ; Tekere, M ; Kortidis, I ; Chatzisymeon, E Date: Aug 2020 In this pilot study, the circular economy concept in wastewater treatment was examined, through a zero liquid discharge (ZLD) process where struvite was recovered and drinking water was reclaimed. A stage wise approach was followed for struvite ... Read more
Application of cryptocrystalline magnesite-bentonite clay hybrid for defluoridation of underground water resources: implication for point of use treatment

Author: Masindi, Vhahangwele Date: Jul 2016 A new synthesis method was established to fabricate a nanocomposite material comprising of cryptocrystalline magnesite and bentonite clay that has high adsorption capacity for ionic pollutants. To synthesize the composite at 1:1 weight (g): ... Read more
Application of magnesite–bentonite clay composite as an alternative technology for removal of arsenic from industrial effluents

Author: Masindi, Vhahangwele ; Gitari, MW ; Tutu, H ; De Beer, Marinda Date: Oct 2014 This study evaluated the feasibility of integrating amorphous magnesite and bentonite clay (composite) as an alternative technology for removing arsenic from industrial effluents. The removal of arsenic from industrial effluents by using ... Read more
Assessing the sustainability of acid mine drainage (AMD) treatment in South Africa

Author: Masindi, Vhahangwele ; Chatzisymeon, E ; Kortidis, L ; Foteini, Spyros Date: Sep 2018 The environmental sustainability of acid mine drainage (AMD) treatment at semi-industrial scale is examined by means of the life cycle assessment (LCA) methodology. An integrated process which includes magnesite, lime, soda ash and CO2 bubbling ... Read more
Calcined magnesite as an adsorbent for cationic and anionic dyes: characterization, adsorption parameters, isotherms and kinetics study

Author: Ngulube, T ; Gumbo, JR ; Masindi, Vhahangwele ; Maity, Arjun Date: Oct 2018 The ability of calcined magnesite for Methylene Blue (MB), Direct Red 81 (DR81), Methyl Orange (MO) and Crystal Violet (CV) dye removal was evaluated in this study. The experiments were designed to test the hypothesis that alkaline earth ... Read more
Comparison of mine water neutralisation efficiencies of different alkaline generating agents

Author: Masindi, Vhahangwele ; Akinwekomi, V ; Maree, JP ; Muedi, KL Date: Aug 2017 Acid mine drainage is formed from the oxidation and hydro-geo-chemical weathering of sulphide bearing minerals. These minerals originate from mining and natural processes. This has led to the formation of a very acidic mine drainage enriched ... Read more
Efficiency of ball milled South African bentonite clay for remediation of acid mine drainage

Author: Masindi, Vhahangwele ; Gitari, MW ; Tutu, H ; De Beer, Morris Date: Dec 2015 The feasibility of using vibratory ball milled South African bentonite clay for neutralization and attenuation of inorganic contaminants from acidic and metalliferous mine effluents has been evaluated. Treatment of acid mine drainage (AMD) ... Read more
Evaluation of the efficacy of halloysite nanotubes in the removal of acidic and basic dyes from aqueous solution

Author: Ngulube, T ; Gumbo, JR ; Masindi, Vhahangwele ; Maity, Arjun Date: Jun 2019 The present work describes the removal of Direct Red 81, Methyl Orange, Methylene Blue and Crystal Violet from aqueous solution using halloysite nanotubes. The clay mineral was physicochemically characterized using various methods. The ... Read more
Fate of inorganic contaminants post treatment of acid mine drainage by cryptocrystalline magnesite: Complimenting experimental results with a geochemical model

Author: Masindi, Vhahangwele ; Gitari, MW ; Tutu, H ; De Beer, Morris Date: Mar 2016 This study assessed the fate of inorganic contaminants post treatment of acid mine drainage by cryptocrystalline magnesite. To accomplish that, neutralization and metal attenuation were evaluated and complemented with simulations using ... Read more
Fate of pollutants post treatment of acid mine drainage with basic oxygen furnace slag: Validation of experimental results with a geochemical model

Author: Masindi, Vhahangwele ; Osman, Muhammad S ; Mbhele, Nkhangweleni R ; Rikhotso, Rirhandzu S Date: 2017 Basic Oxygen Furnace (BOF) slag has been widely used for Acid Mine Drainage (AMD) treatment with its reaction chemistry and contaminants attenuation mechanisms barely reported. This pioneer study was therefore designed with the aim of evaluating ... Read more
Fractional and sequential recovery of inorganic contaminants from acid mine drainage using cryptocrystalline magnesite

Author: Masindi, Vhahangwele ; Ndiritu, JG Date: Jun 2017 This study evaluated the fractional and sequential recovery of inorganic contaminants from acid mine drainage (AMD) using cryptocrystalline magnesite. Batch experimental approach was used to fulfil the goals of this study. The obtained results ... Read more
Fractional and step-wise recovery of chemical species from acid mine drainage using calcined cryptocrystalline magnesite nano-sheets: An experimental and geochemical modelling approach

Author: Masindi, Vhahangwele ; Ndiritu, JG ; Maree, JP Date: Apr 2018 In this study, a process of fractional and step-wise recovery of metals from Acid Mine Drainage (AMD) using calcined cryptocrystalline magnesite was explored. pH Redox Equilibrium (in C language) (PHREEQC) was used to complement the experimental ... Read more
Integrated removal of inorganic contaminants from acid mine drainage using BOF slag, lime, soda ash and reverse osmosis (RO): Implication for the production of drinking water

Author: Masindi, Vhahangwele ; Osman, Muhammad S Date: Jun 2017 This study evaluated the interaction of acid mine drainage (AMD) with Basic Oxygen (BOF) slag. The reaction proved that pH = 10, and 99% metals removal and 75% removal were achieved. Sulphate concentration was reduced from 18000 to 4000 mg/L ... Read more
Integrated treatment of acid mine drainage using BOF slag, lime/soda ash and reverse osmosis (RO): Implication for the production of drinking water

Author: Masindi, Vhahangwele ; Osman, Muhammad S ; Abu-Mahfouz, Adnan MI Date: Dec 2017 Acid mine drainage has been an issue of prime concern to international scientific communities. This is due to the magnitude, nature and extent of its environmental impacts. Acid mine drainage (AMD) contains hazardous and toxic chemical species ... Read more
Integrated treatment of acid mine drainage using cryptocrystalline magnesite and barium chloride

Author: Masindi, Vhahangwele Date: Aug 2017 This study endeavours to report the efficiency of a hybrid approach in the treatment of acid mine drainage. Cryptocrystalline magnesite was used to pre-treat acid mine drainage and barium chloride was used to remove the residual sulphate ... Read more
Kinetics and equilibrium studies for removal of fluoride from underground water using cryptocrystalline magnesite

Author: Masindi, Vhahangwele ; Gitari, WM ; Ngulube, T Date: Sep 2015 In the present study, the defluoridation capabilities and adsorption mechanisms of cryptocrystalline magnesite were evaluated. All experiments were done by batch procedure. Conditions assessed include time, dosage, concentration, pH and the ... Read more
Neutralization and attenuation of metal species in acid mine drainage and mine leachates using magnesite: a batch experimental approach

Author: Masindi, Vhahangwele ; Gitari, WM ; Tutu, H ; De Beer, Morris ; Nekhwevha, N Date: Aug 2014 This paper evaluates the potential application of amorphous magnesite for remediation of Acid Mine Drainage (AMD). Magnesite was mixed with simulated AMD at specific S/L ratios and agitated in an orbital shaker and its capacity to remove ... Read more
A novel technology for neutralizing acidity and attenuating toxic chemical species from acid mine drainage using cryptocrystalline magnesite tailings

Author: Masindi, Vhahangwele Date: Apr 2016 The present study was developed with the aim of beneficiating two waste materials by converting them into a resource. Magnesite tailings, which is the by-product of magnesite mining, was used to remediate acid mine drainage (AMD) which is the ... Read more

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