scholarly journals Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column Reactor

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 99
Author(s):  
Shigeshi Fuchida ◽  
Shota Tajima ◽  
Takuro Nishimura ◽  
Chiharu Tokoro
Keyword(s):  
Kinetic Modeling ◽  
Mine Water ◽  
Pilot Scale ◽  
Silica Sand ◽  
Edge Structure ◽  
Column Reactor ◽  
Molar Ratios ◽  
Manganese Removal ◽  
Water Ph ◽  
Xanes Analysis

Manganese (Mn) is a major element in various aqueous and soil environments that is sometimes highly concentrated in mine water and other mineral processing wastewater. In this study, we investigated Mn removal from alkaline mine water (pH > 9) with an Mn-coated silica sand packed into a pilot-scale column reactor and examined the specific reaction mechanism using X-ray absorption near-edge structure (XANES) analysis and geochemical kinetic modeling. The kinetic effect of dissolved Mn(II) removal by birnessite (δ-Mn(IV)O2) at pH 6 and 8 was evaluated at different Mn(II)/Mn(IV) molar ratios of 0.1–10. Our results confirmed the positive effect of the presence of δ-MnO2 on the short-term removal (60 min) of dissolved Mn. XANES analysis results revealed that δ-MnO2 was more abundant than Mn(III)OOH in the reactor, which may have accumulated during a long-term reaction (4 months) after the reactor was turned on. A gradual decrease in dissolved Mn(II) concentration with depth was observed in the reactor, and comparison with the kinetic modeling result confirmed that δ-MnO2 interaction was the dominant Mn removal mechanism. Our results show that δ-MnO2 contents could play a significant role in controlling Mn removability from mine water in the reactor.

Pilot-scale neutralisation of underground mine water

1996 ◽  
Vol 34 (10) ◽  
pp. 141-149 ◽  
Author(s):  
J. P. Maree ◽  
G. J. van Tonder ◽  
P. Millard ◽  
T. C. Erasmus
Keyword(s):  
Mine Water ◽  
Contact Time ◽  
Pilot Scale ◽  
Underground Water ◽  
Underground Mine ◽  
Economic Feasibility ◽  
Fluidised Bed ◽  
Chemical Composition Of Water ◽  
Before And After ◽  
Time Required

Traditionally acid mine water is neutralised with lime (Ca(OH)2). Limestone (CaCO3) is a cheaper alternative for such applications. This paper describes an investigation aimed at demonstrating that underground mine water can be neutralised with limestone in a fluidised-bed. The contact time required between the limestone and the acid water, chemical composition of water before and after treatment, and economic feasibility of the fluidised bed neutralisation process are determined. A pilot plant with a capacity of 10k1/h was operated continuously underground in a gold mine. The underground water could be neutralised effectively using the limestone process. The pH of the water was increased from less than 3 to more than 7, the alkalinity of the treated water was greater than 120 mg/l (as CaCO3) and the contact time required between mine water and limestone was less than 10 min (the exact contact time depends on the limestone surface area). Chemical savings of 56.4% can be achieved compared to neutralisation with lime.

Optimization and Kinetic Modeling of Honey Fermentation for Laboratory and Pilot-Scale Mead Production

2021 ◽  
pp. 1-10
Author(s):  
Marta Cuenca ◽  
Amaury Blanco ◽  
Marta Quicazán ◽  
Carlos Zuluaga-Domínguez
Keyword(s):  
Kinetic Modeling ◽  
Pilot Scale

Energy and water balances using kinetic modeling in a pilot-scale SSF bioreactor

2004 ◽  
Vol 39 (11) ◽  
pp. 1793-1802 ◽  
Author(s):  
J.Sebastián Lekanda ◽  
J.Ricardo Pérez-Correa
Keyword(s):  
Kinetic Modeling ◽  
Pilot Scale ◽  
Water Balances

scholarly journals Cyclometalated Iridium(III) Complexes Containing Benzoxazole Derivatives and Different Ancillary Ligands for Catalytic Oxidation of Toluene

Inorganics ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 118 ◽  
Author(s):  
Kelvin Chen ◽  
Pei-Chun Liu ◽  
Tsun-Ren Chen ◽  
Jhy-Der Chen
Keyword(s):  
Catalytic Oxidation ◽  
Kinetic Modeling ◽  
Processing Time ◽  
Pyridine Derivatives ◽  
Turnover Number ◽  
Edge Structure ◽  
Ancillary Ligands ◽  
X Ray ◽  
Environmentally Friendly Process ◽  
X Ray Absorption

A series of cyclometalated iridium(III) complexes that have the general formula [(C^N)2Ir(NR)(X)] (C^N = monoanionic bidentate cyclometalating ligands; NR = pyridine derivatives; X = Cl− or I−) are designed, prepared, and applied for the transformation of toluene to benzaldehyde using a clean, highly efficient, and environmentally-friendly process. The activation energies that are needed for the catalytic oxidation of toluene when using these complexes as catalysts are quite low: between 22.9 and 30.8 kcal mol−1. The catalytic frequencies (TOF) are fairly high (up to 7.0 × 102 h−1) with excellent reliability, and the turnover number (TON) can reach 4.2 × 103 after 6 h of processing time. Catalytic tests, X-ray absorption near-edge structure (XANES), and kinetic modeling are used to derive detailed insights into the characteristics of the catalysts and their effects on the reactions that are featured in the catalytic oxidation of toluene.

scholarly journals Solving local structure around dopants in metal nanoparticles with ab initio modeling of X-ray absorption near edge structure

2016 ◽  
Vol 18 (29) ◽  
pp. 19621-19630 ◽  
Author(s):  
Janis Timoshenko ◽  
Atal Shivhare ◽  
Robert W. J. Scott ◽  
Deyu Lu ◽  
Anatoly I. Frenkel
Keyword(s):  
Ab Initio ◽  
Metal Nanoparticles ◽  
Local Structure ◽  
Heterogeneous Catalysts ◽  
Edge Structure ◽  
X Ray ◽  
Metal Impurities ◽  
Local Environments ◽  
X Ray Absorption ◽  
Xanes Analysis

XANES analysis guided by ab initio modeling is proposed for refinement of local environments around metal impurities in heterogeneous catalysts.

scholarly journals Synergistic Recapturing of External and Internal Phosphorus for In Situ Eutrophication Mitigation

Water ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 2 ◽  
Author(s):  
Minmin Pan ◽  
Tao Lyu ◽  
Meiyi Zhang ◽  
Honggang Zhang ◽  
Lei Bi ◽  
...  
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Pilot Scale ◽  
P Adsorption ◽  
Control Approach ◽  
P Concentration ◽  
Water Ph ◽  
Low Levels ◽  
P Removal

In eutrophication management, many phosphorus (P) adsorbents have been developed to capture P at the laboratory scale. Existing P removal practice in freshwaters is limited due to the lack of assessment of the possibility and feasibility of controlling P level towards a very low level (such as 10 μg/L) in order to prevent the harmful algal blooms. In this study, a combined external and internal P control approach was evaluated in a simulated pilot-scale river–lake system. In total, 0.8 m3 of simulated river water was continuously supplied to be initially treated by a P adsorption column filled with a granulated lanthanum/aluminium hydroxide composite (LAH) P adsorbent. At the outlet of the column (i.e., inlet of the receiving tanks), the P concentration decreased from 230 to 20 µg/L at a flow rate of 57 L/day with a hydraulic loading rate of 45 m/day. In the receiving tanks (simulated lake), 90 g of the same adsorbent material was added into 1 m3 water for further in situ treatment, which reduced and maintained the P concentration at 10 µg/L for 5 days. The synergy of external and internal P recapture was demonstrated to be an effective strategy for maintaining the P concentration below 10 µg/L under low levels of P water input. The P removal was not significantly affected by temperature (5–30 °C), and the treatment did not substantially alter the water pH. Along with the superior P adsorption capacity, less usage of LAH could lead to reduced cost for potation eutrophication control compared with other widely used P adsorbents.

scholarly journals Pilot scale evaluation of mine water (MW) as a cooling medium

Water SA ◽  
2007 ◽  
Vol 30 (5) ◽  
Author(s):  
JS Swart ◽  
JP Engelbrecht
Keyword(s):  
Mine Water ◽  
Pilot Scale ◽  
Scale Evaluation ◽  
Cooling Medium

Regeneration of barium carbonate from barium sulphide in a pilot-scale bubbling column reactor and utilization for acid mine drainage

2012 ◽  
Vol 65 (2) ◽  
pp. 324-331 ◽  
Author(s):  
J. Mulopo ◽  
J. N. Zvimba ◽  
H. Swanepoel ◽  
L. T. Bologo ◽  
J. Maree
Keyword(s):  
Acid Mine Drainage ◽  
Flow Rate ◽  
Mine Drainage ◽  
Barium Carbonate ◽  
Pilot Scale ◽  
Carbonation Reaction ◽  
Column Reactor ◽  
Acid Mine ◽  
Sulphate Removal ◽  
Co2 Flow

Batch regeneration of barium carbonate (BaCO3) from barium sulphide (BaS) slurries by passing CO2 gas into a pilot-scale bubbling column reactor under ambient conditions was used to assess the technical feasibility of BaCO3 recovery in the Alkali Barium Calcium (ABC) desalination process and its use for sulphate removal from high sulphate Acid Mine Drainage (AMD). The effect of key process parameters, such as BaS slurry concentration and CO2 flow rate on the carbonation, as well as the extent of sulphate removal from AMD using the recovered BaCO3 were investigated. It was observed that the carbonation reaction rate for BaCO3 regeneration in a bubbling column reactor significantly increased with increase in carbon dioxide (CO2) flow rate whereas the BaS slurry content within the range 5–10% slurry content did not significantly affect the carbonation rate. The CO2 flow rate also had an impact on the BaCO3 morphology. The BaCO3 recovered from the pilot-scale bubbling column reactor demonstrated effective sulphate removal ability during AMD treatment compared with commercial BaCO3.

Influencing Factors of the In Situ Formed Iron Hydroxide (FeOxHy) on the Removal of Phosphate by Coagulation and Adsorption

2013 ◽  
Vol 864-867 ◽  
pp. 1772-1778 ◽  
Author(s):  
Li Hua Sun ◽  
Tian Min Yu ◽  
Xue Ru Chen ◽  
Xiao Lu Qi ◽  
Ya Jun Zhang
Keyword(s):  
Ph Value ◽  
Removal Rate ◽  
Iron Hydroxide ◽  
Phosphate Removal ◽  
Chemical Action ◽  
Mass Unit ◽  
Molar Ratios ◽  
Hydroxyl Ion ◽  
Water Ph

This study prepared the in situ formed iron hydroxide (in situ FeOxHy) by the interactions between Fe3+ and OH- at different molar ratios of 1:0, 1:1, 1:2 and 1:3. The influences of molar ratios and pH on the removal of phosphate were investigated and the surface of in situ FeOxHy before and after adsorption was analyzed. The phosphate removal rate with mass unit iron hydroxide is greater at the molar ratios of 1:3 between Fe3+ and OH-. The phosphate removal rate is maximum at the pH 6~7. The compatibility of iron hydroxide towards raw water pH value is better when the proportion of hydroxyl ion is greater. The disposal effect is good at the pH 4~9. The iron hydroxide formed at different molar ratios is not definitive shape and it can remove phosphate by the chemical action of adsorption and sedimentation.

Selective ion adsorption with pilot-scale membrane capacitive deionization (MCDI): arsenic, ammonium and manganese removal

2020 ◽  
Vol 198 ◽  
pp. 163-169
Author(s):  
Edgardo E. Cañas Kurz ◽  
Ulrich Hellriegel ◽  
Vu T. Luong ◽  
Jochen Bundschuh ◽  
Jan Hoinkis
Keyword(s):  
Pilot Scale ◽  
Ion Adsorption ◽  
Capacitive Deionization ◽  
Manganese Removal
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