1,720,998 research outputs found
Supplementary_material_PUF_PRR - Rigid polyurethane foams from unrefined crude glycerol and technical lignins
No full textSupplementary_material_PUF_PRR for Rigid polyurethane foams from unrefined crude glycerol and technical lignins by Louis Christiaan Muller, Sanette Marx, Hermanus CM Vosloo, Elvis Fosso-Kankeu, and Idan Chiyanzu in Polymers from Renewable Resources</p
Supplementary_material_PUF_PRR - Rigid polyurethane foams from unrefined crude glycerol and technical lignins
No full textSupplementary_material_PUF_PRR for Rigid polyurethane foams from unrefined crude glycerol and technical lignins by Louis Christiaan Muller, Sanette Marx, Hermanus CM Vosloo, Elvis Fosso-Kankeu, and Idan Chiyanzu in Polymers from Renewable Resources</p
Enhancing engineering students participation and performance through continuous evaluation and research approach
No full textThe poster was presented at the 7th annual North-West
University (NWU) Teaching and Learning Conference –hosted by the Centre
for Teaching and Learning (CTL) - 6 and 7 June 2017.<br
Microbial Metalloproteins-Based Responses in the Development of Biosensors for the Monitoring of Metal Pollutants in the Environment
No full textSynthesized af-PFCl and GG-g-P(AN)/TEOS hydrogel composite used in hybridized technique applied for AMD treatment
No full textIn the present study af-PFCl, GL-g-P(AN) hydrogel and GL-g-P(AN)/TEOS hydrogel composite were synthesized. The hydrogels were characterized using the fourier transformed infra-red (FTIR) and the scanning electron microscope (SEM) techniques. The coagulant af-PFCl and the hydrogels were applied consecutively in flocculation and adsorption processes respectively for the treatment of acid mine drainage (AMD). It was observed that the grafting process increased the amount of binding groups on the hydrogels. The hybridization of the techniques assisted in the removal of anions; while the cations were mostly removed by the adsorption process. The adsorbents behaviour was fittingly expressed by the pseudo-second order model. The adsorption capacities of GL-g-P(AN)/TEOS hydrogel composite for the removal of Al, As and Zn were 3.89, 0.66 and 0.394 respectively; while the adsorption capacities of GL-g-P(AN) for the removal of Al and Mg were 3.47 and 9.66 mg/g respectively.
The techniques applied in this study have shown good potential for the removal of specific pollutants from the AMD; it is however, important that the appropriate hybridization of techniques allows to remove all the pollutants and restore acceptable water qualit
Photocatalytic degradation and adsorption techniques involving nanomaterials for biotoxins removal from drinking water
No full textAchieving Controllable MoS<sub>2</sub> Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems
No full textThe development of
new synthesis approaches for MoS2 is necessary to achieve
controlled morphologies and unique physicochemical properties that
can improve its efficiency in particular applications. Herein, a facile
one-step hydrothermal route is proposed to prepare controllable MoS2 micro/nanostructures with an increased interlayer using sodium
diethyldithiocarbamate trihydrate as the new S source at different
pH values. To investigate the morphology, chemical composition, and
structure of the MoS2 micro/nanostructures, various characterization
techniques were used. The obtained microrods, microspheres, and microrods
with hairlike structures (denoted as MoS2-N-H) were composed
of MoS2 nanosheets with increased interlayer spacing (∼1.0
nm) and utilized for the removal of Pb(II) from aquatic systems. Among
the structures, MoS2-N-H demonstrated the highest adsorption
capacity (303.04 mg/g) for Pb(II) due to the existence of −S/–C/–N/–O-comprised
functional groups on its surface, which led to strong Pb–S
complexation and electrostatic attractions. The uptake of Pb(II) onto
MoS2-N-H followed pseudo-second-order kinetics and Freundlich
isotherm. To evaluate its practical applicability, the adsorbent was
employed in real mine water analysis; it was found that MoS2-N-H could adsorb almost 100% of the Pb(II) ions in the presence
of various coexisting ions. Additionally, after Pb(II) adsorption,
MoS2-N-H was transformed into PbMoO4‑xSx spindlelike nanostructures,
which were further used for photodegradation of an antibiotic, viz.,
ciprofloxacin (CIP), to avoid secondary environment waste. Thus, this
investigation provides an effective one-pot approach to fabricate
controllable MoS2 micro/nanostructures with increased interlayer
spacing for water treatment. The utility of these nanostructures in
related supercapacitor/battery applications may also be envisaged
because of their unique structural properties
Evaluation of Fecal Coliform Prevalence and Physicochemical Indicators in the Effluent from a Wastewater Treatment Plant in the North-West Province, South Africa
No full textCompliance of the effluents from wastewater treatment plants (WWTPs) to the regulatory standards, which mostly entail the removal/reduction of organic waste and deactivation of the potential microbial pathogens is of great importance. The detection of indicator parameters can be used to determine the effectiveness of a WWTP and the level of compliance with the South African regulatory standards. The performance of the WWTP was assessed by biological, physical and chemical measures in wastewater final effluent. The Escherichia coli ranged from 0 and 2420 count/100 mL in the final effluent. The recorded values for the physicochemical parameters were within the following ranges: pH (7.03–8.49), electrical conductivity (81.63–126.5 mS/m), suspended solids (0.40–20.4 mg/L), ammonia (0–22.15 mg/L), Chemical Oxygen Demand (COD) (1–73 mg/L), nitrate (0–16.1 mg/L), ortho-phosphate (0–8.58 mg/L) and free chlorine (0–3.21 mg/L). Furthermore, the concentration of toxic heavy metals was recorded to be between 1–10 ug/L for arsenic, cadmium, lead and mercury. In conclusion, all the parameters that were evaluated in this study indicate that the studied WWTP is performing in accordance with the prescribed general limits
Simultaneous gas and electricity production from an MFC stimulated by crude glycerol
No full textPoster presented at 7th International Conference on Latest Trends in Engineering and
Technology (ICLTET’ 2015), November 26-27, 2015 Irene, Pretoria (South Africa).
Editors: E. Muzenda and T Yingthawornsuk. ISBN: 978-93-84422-58-5.<br
A pilot study on the removal of ammonia from aqueous solution using the integration of struvite synthesis and breakpoint chlorination
Get PDFHerein, a pilot study on the removal of ammonia from surface water using the integration of struvite precipitation and breakpoint chlorination is reported. A two staged pilot plant with a capacity of 1000 liters (1 m3) per run (LPR) was utilized, of which Stage 1 comprised struvite precipitation and Stage 2 comprised breakpoint chlorination. Optimum conditions (i.e., Stage 1) for struvite precipitation were 110 mg/L of Mg and P dosage (concentration), 150 rpm of mixing speed, 60 minutes of contact time, and lastly, 120 minutes of sedimentation, while optimum condition for the breakpoint chlorination (i.e., Stage 2) were 30 minutes of mixing and an 8:1 Cl2-NH4+ weight ratio. The synergistic effects of this hybrid system proved to be effective, with Stage 1 increasing the pH from 6.8 to 10.1, reducing Mn (≥97.0%) and Fe (≥99.6%) concentrations steeply, and concomitantly deactivated E coli and TPC to ≥ 99% and ≥91%, respectively, while ammonia was reduced from 5.4 mg/L to 2.7 mg/L-N (51.8 %). In Stage 2, i.e., breakpoint chlorination, ammonia was reduced from 2.7 mg/L to 0.02 mg/L-N whilst fully depleting residual microorganisms. Finally, the OPEX amounted to $ 0.31/m3; however, there is a potential for cost savings (≈53.2%) by replacing Kh2PO4 with waste phosphoric acid. Lastly, the results from this techno-economic evaluation study showed great potential compared to similar technologies, making this approach a game-changer towards the prudent management of elevated levels of ammonia amongst other problematic contaminants
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