scholarly journals Removal of Manganese(II) from Acid Mine Wastewater: A Review of the Challenges and Opportunities with Special Emphasis on Mn-Oxidizing Bacteria and Microalgae

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2493 ◽  
Author(s):  
Yongchao Li ◽  
Zheng Xu ◽  
Hongqing Ma ◽  
Andrew S. Hursthouse
Keyword(s):  
Dissolved Oxygen ◽  
Mine Drainage ◽  
Enzymatic Catalysis ◽  
Microbial Oxidation ◽  
Solution Ph ◽  
Chemical Reagents ◽  
Synergistic Interactions ◽  
Challenges And Opportunities ◽  
Mine Wastewater ◽  
Neutral Conditions

Many global mining activities release large amounts of acidic mine drainage with high levels of manganese (Mn) having potentially detrimental effects on the environment. This review provides a comprehensive assessment of the main implications and challenges of Mn(II) removal from mine drainage. We first present the sources of contamination from mineral processing, as well as the adverse effects of Mn on mining ecosystems. Then the comparison of several techniques to remove Mn(II) from wastewater, as well as an assessment of the challenges associated with precipitation, adsorption, and oxidation/filtration are provided. We also critically analyze remediation options with special emphasis on Mn-oxidizing bacteria (MnOB) and microalgae. Recent literature demonstrates that MnOB can efficiently oxidize dissolved Mn(II) to Mn(III, IV) through enzymatic catalysis. Microalgae can also accelerate Mn(II) oxidation through indirect oxidation by increasing solution pH and dissolved oxygen production during its growth. Microbial oxidation and the removal of Mn(II) have been effective in treating artificial wastewater and groundwater under neutral conditions with adequate oxygen. Compared to physicochemical techniques, the bioremediation of manganese mine drainage without the addition of chemical reagents is relatively inexpensive. However, wastewater from manganese mines is acidic and has low-levels of dissolved oxygen, which inhibit the oxidizing ability of MnOB. We propose an alternative treatment for manganese mine drainage that focuses on the synergistic interactions of Mn in wastewater with co-immobilized MnOB/microalgae.

scholarly journals The Use of Mining Waste Materials for the Treatment of Acid and Alkaline Mine Wastewater

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1061
Author(s):  
Jacek Retka ◽  
Grzegorz Rzepa ◽  
Tomasz Bajda ◽  
Lukasz Drewniak
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Low Cost ◽  
Potassium Feldspar ◽  
Waste Rock ◽  
Chemical Reagents ◽  
Acid Mine ◽  
High Zinc ◽  
Mine Wastewater ◽  
High Zinc Concentration

The mining of metal ores generates both liquid and solid wastes, which are increasingly important to manage. In this paper, an attempt was made to use waste rocks produced in the mining of zinc and lead to neutralizing acid mine drainage and alkaline flotation wastewater. Waste rock is a quartz-feldspar rock of hydrothermal origin. It is composed of, besides quartz and potassium feldspar (orthoclase), phyllosilicates (chlorite and mica), and sulfides (chiefly pyrite). To determine its physicochemical parameters and their variability, acid mine water and flotation wastewater were monitored for 12 months. Acid mine drainage (AMD) is characterized by a low pH (~3), high zinc concentration (~750 mg·L−1), and high sulfate content (~6800 mg·L−1). On the other hand, the determinations made for flotation wastewater showed, among others, a pH of approximately 12 and ca. 780 mg·L−1 of sulfates. AMD and flotation wastewater neutralization by the waste rock was shown to be possible and efficient. However, in both cases, the final solution contained elevated concentrations of metals and sulfates. Premixing AMD with alkaline flotation wastewater in the first step and then neutralizing the obtained mixture with the waste rock was considered the best solution. The produced solution had a circumneutral pH. However, the obtained solution does not meet the legislative requirements but could be further treated by, for example, passive treatment systems. It is noteworthy that the proposed approach is low cost and does not require any chemical reagents.

UV Photolytic Mechanism ofN-Nitrosodimethylamine in Water:  Roles of Dissolved Oxygen and Solution pH

2005 ◽  
Vol 39 (24) ◽  
pp. 9702-9709 ◽  
Author(s):  
Changha Lee ◽  
Wonyong Choi ◽  
Jeyong Yoon
Keyword(s):  
Dissolved Oxygen ◽  
Solution Ph

scholarly journals Heterogeneous selenite reduction by zero valent iron steel wool

2016 ◽  
Vol 75 (4) ◽  
pp. 908-915 ◽  
Author(s):  
Ziyan Li ◽  
Donglin Huang ◽  
Louis M. McDonald
Keyword(s):  
Photoelectron Spectroscopy ◽  
Mine Drainage ◽  
Critical Factor ◽  
Zero Valent Iron ◽  
Spectroscopic Techniques ◽  
Steel Wool ◽  
Solution Ph ◽  
Selenite Reduction ◽  
Heterogeneous Reduction ◽  
Low Sulfur

Mine drainage from the low-sulfur surface coal mines in southern West Virginia, USA, is circumneutral (pH > 6) but contains elevated selenium (Se) concentrations. Removal of selenite ions from aqueous solutions under anoxic condition at pH 6–8.5 by zero valent iron steel wool (ZVI-SW) was investigated in bench-scale kinetic experiments using wet chemical, microscopic and spectroscopic techniques (X-ray photoelectron spectroscopy). ZVI-SW could effectively and efficiently remove SeIV from solution with pH 6–8.5. A two-step removal mechanism was identified for SeIV reduction by ZVI-SW. The proposed mechanism was electrochemical reduction of SeIV by Fe0 in an initial lag stage, followed by a faster heterogeneous reduction, mediated by an FeII-bearing phase (hydroxide or green rust). Solution pH was a critical factor for the kinetic rate in the lag stage (0.33 h−1 for pH > 8 and 0.10 h−1 for pH 6–8). The length of lag stage was 20–30 min as determined by the time for dissolved FeII concentration to reach 0.30 ± 0.04 mg L−1 which was critical for induction of the faster stage. About 65% of the initial SeIV was reduced to Se0, the primary reductive product in both stages.

Simultaneous Determination of Nitrate and Dissolved Oxygen under Neutral Conditions Using a Novel Silver-Deposited Gold Microelectrode

2008 ◽  
Vol 42 (22) ◽  
pp. 8465-8470 ◽  
Author(s):  
You-Peng Chen ◽  
Shao-Yang Liu ◽  
Fang Fang ◽  
Shu-Hong Li ◽  
Gang Liu ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Simultaneous Determination ◽  
Neutral Conditions ◽  
Gold Microelectrode

scholarly journals Wastewater Treatment Using Constructed Wetland: Current Trends and Future Potential

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1917
Author(s):  
Ikrema Hassan ◽  
Saidur R. Chowdhury ◽  
Perdana K. Prihartato ◽  
Shaikh A Razzak
Keyword(s):  
Municipal Wastewater ◽  
Mine Drainage ◽  
Future Research ◽  
Fast Growing ◽  
Performance Metric ◽  
Emerging Trends ◽  
Petroleum Refinery Wastewater ◽  
Challenges And Opportunities ◽  
And Performance ◽  
Key Aspects

Constructed wetlands (CW) is an environmentally friendly technique for removing pollutants from wastewater and has been applied to municipal wastewater, petroleum refinery wastewater, agriculture drainage, acid mine drainage, etc. The past decade has seen a remarkable number of innovations in the exponentially growing field of microbiology. This manuscript covers a critical review of key aspects of CW, such as various types of CW, the contaminants and their removal mechanisms, degradation pathways, challenges and opportunities, materials, applications, and theory with a focus on recent advances in the last three decades. In addition, an attempt has been taken to project future advances in the field of CW and facilitate these advances by framing key unsolved problems in CW. Guidelines are prepared for the fast-growing CW field through the standardization of key design aspects. This review covers the evaluation of the current state-of-the-art of CW technology and provides definitions and performance metric nomenclature in an effort to unify the fast-growing CW community. It also contains an outlook on the emerging trends in CW and proposes future research and development directions.

scholarly journals How are oxygen budgets influenced by dissolved iron and growth of oxygenic phototrophs in an iron-rich spring system? Initial results from the Espan Spring in Fürth, Germany

2021 ◽  
Vol 18 (15) ◽  
pp. 4535-4548
Author(s):  
Inga Köhler ◽  
Raul E. Martinez ◽  
David Piatka ◽  
Achim J. Herrmann ◽  
Arianna Gallo ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Iron Oxidation ◽  
Warm Season ◽  
Cold Season ◽  
Oxygenic Photosynthesis ◽  
Dissolved Iron ◽  
Natural Iron ◽  
Spring System ◽  
Neutral Conditions ◽  
The Impact

Abstract. At present most knowledge on the impact of iron on 18O / 16O ratios (i.e. δ18O) of dissolved oxygen (DO) under circum-neutral conditions stems from experiments carried out under controlled laboratory conditions. These showed that iron oxidation leads to an increase in δ18ODO values. Here we present the first study on effects of elevated Fe(II) concentrations on the δ18ODO in a natural, iron-rich, circum-neutral watercourse. Our results show that iron oxidation was the major factor for rising dissolved oxygen isotope compositions in the first 85 m of the system in the cold season (February) and for the first 15 m during the warm season (May). Further along the course of the stream, the δ18ODO decreased towards values known for atmospheric equilibration around +24.6 ‰ during both seasons. Possible drivers for these changes may be reduced iron oxidation, increased atmospheric exchange and DO production by oxygenic phototrophic algae mats. In the cold season, the δ18ODO values stabilized around atmospheric equilibrium, whereas in the warm season stronger influences by oxygenic photosynthesis caused values down to +21.8 ‰. In the warm season from 145 m downstream of the spring, the δ18ODO increased again until it reached atmospheric equilibrium. This trend can be explained by respiratory consumption of DO combined with a relative decrease in photosynthetic activity and increasing atmospheric influences. Our study shows that dissolved Fe(II) can exert strong effects on the δ18ODO of a natural circum-neutral spring system even under constant supply of atmospheric O2. However, in the presence of active photosynthesis, with supply of O2 to the system, direct effects of Fe oxidation on the δ18ODO value become masked. Nonetheless, critical Fe(II) concentrations may indirectly control DO budgets by enhancing photosynthesis, particularly if cyanobacteria are involved.

Treatment of Acid Mine Drainage by Sulfate Reducing Bacteria and Iron at Room Temperature

2010 ◽  
Vol 113-116 ◽  
pp. 1500-1503
Author(s):  
Ying Feng ◽  
Yong Kang ◽  
Yan Fang Yu
Keyword(s):  
Room Temperature ◽  
Mine Drainage ◽  
Reduction Rate ◽  
Sulfate Reducing Bacteria ◽  
Treatment Efficiency ◽  
Sulfate Reducing ◽  
Acid Mine ◽  
Mine Wastewater ◽  
Reducing Bacteria ◽  
Acid Mining Drainage

This study describes a new method to treat acid mine wastewater containing high amounts of heavy metals and sulfate by biotechnology. Sulfate reducing Bacteria (SRB) was inoculated in an up-flow multiple bed bioreactor treating practical wastewater. In addition to precipitation processes, water purification was also possible with the metabolism process of microorganisms. Iron dust was added to the system to enhance the activity of SRB and ensure the treatment efficiency. The results indicates that treating acid mining drainage using SRB and iron at room temperature (20°C~25°C) is possible, the reduction rate of sulfate is up to 61%, pH of wastewater raises from 2.75 to 6.2 and the copper concentration of effluent is less than 0.2 mg/L.

Isolation and Characterization of Toxic Metal Removing Bacterial Bioflocculants

2015 ◽  
Vol 1130 ◽  
pp. 585-588 ◽  
Author(s):  
K. Karthiga Devi ◽  
K.A. Natarajan
Keyword(s):  
Metal Pollution ◽  
Mine Drainage ◽  
Metal Removal ◽  
Waste Water Treatment ◽  
Toxic Metal ◽  
Abandoned Mines ◽  
Metal Extraction ◽  
Scanning Calorimetry ◽  
Solution Ph ◽  
Isolation And Characterization

Toxic metal pollution of ground and surface waters occur due to mining, mineral processing and metal extraction processes. Acid mine drainage emanating from abandoned mines and processed tailings and mined ore burdens also contribute to heavy metal pollution of water bodies. Bacterial bioflocculants are known to be useful in waste water treatment and exhibit higher metal removal efficiencies even at low metal concentrations. Bioflocculant generation from three types of bacterial strains, namely, Bacillus licheniformis, Bacillus firmus and Bacillus megaterium was studied and optimized. The bacterial bioflocculants were characterized using Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC) and Thin layer chromatography (TLC). Flocculation efficiencies of different bioflocculants were established with respect to clay and hematite suspensions and compared. Use of the bioflocculants in the removal of toxic metals such as chromium and arsenic was established as a function of solution pH, metal concentration, time and flocculant dosage.

scholarly journals ANC–BNC Titrations and Geochemical Modeling for Characterizing Calcareous and Siliceous Mining Waste

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 257
Author(s):  
Clémentine Drapeau ◽  
Cécile Delolme ◽  
Clément Vézin ◽  
Denise Blanc ◽  
Thomas Baumgartl ◽  
...  
Keyword(s):  
Mine Drainage ◽  
Geochemical Modeling ◽  
Mining Waste ◽  
Main Element ◽  
Liquid Phases ◽  
Neutralizing Capacity ◽  
Mineral Assemblages ◽  
Ph Range ◽  
Neutral Conditions

Pyrite and calcite are mineral phases that play a major role in acid and neutral mine drainage processes. However, the prediction of acid mine drainage (AMD) or contaminated neutral drainage (CND) requires knowledge of the mineral composition of mining waste and the related potential for element release. This paper studies the combination of acid–base neutralizing capacity (ANC–BNC) with geochemical modeling for the characterization of mining waste and prediction of AMD and CND. The proposed approach is validated with three synthetic mineral assemblages: (1) siliceous sand with pyrite only, representing mining waste responsible for AMD, (2) siliceous sand with calcite and pyrite, representing calcareous waste responsible for CND, and (3) siliceous sand with calcite only, simulating calcareous matrices without any pyrite. The geochemical modeling approach using PHREEQC software was used to model pH evolution and main element release as a function of the added amount of acid or base over the entire pH range: 1 < pH < 13. For calcareous matrices (sand with calcite), the results are typical of a carbonated environment, the geochemistry of which is well known. For matrices containing pyrite, the results identify different pH values favoring the dissolution of pyrite: pH = 2 in a pyrite-only environment and pH = 6 where pyrite coexists with calcite. The neutral conditions can be explained by the buffering capacity of calcite, which allows iron oxyhydroxide precipitation. Major element release is then related to the dissolution and precipitation of the mineral assemblages. The geochemical modeling allows the prediction of element speciation in the solid and liquid phases. Our findings clearly prove the potential of combined ANC–BNC experiments along with geochemical modeling for the characterization of mining waste and the assessment of risk of AMD and CND.

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