scholarly journals Release of arsenite, arsenate and methyl-arsenic species from streambed sediment affected by acid mine drainage: a microcosm study

2014 ◽  
Vol 11 (5) ◽  
pp. 514 ◽  
Author(s):  
Marina Héry ◽  
Corinne Casiot ◽  
Eléonore Resongles ◽  
Zoe Gallice ◽  
Odile Bruneel ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Microbial Activity ◽  
Mine Drainage ◽  
Arsenic Species ◽  
Low Flow ◽  
Main Process ◽  
Anoxic Conditions ◽  
Mining Sites ◽  
Acid Mine ◽  
Set Up

Environmental context Arsenic-rich waters generated from the oxidation of mining wastes are responsible for the severe contamination of river waters and sediments located downstream from mining sites. Under certain environmental conditions, the affected riverbed sediments may represent a reservoir for arsenic from which this toxic element may be released into water, mainly as a consequence of microbial activity. Abstract The (bio-)geochemical processes driving As mobilisation from streambed sediments affected by acid mine drainage (AMD) were investigated, and the structure of the bacterial community associated with the sediments was characterised. Microcosm experiments were set up to determine the effect of oxygen, temperature (4 and 20°C) and microbial activity on As mobilisation from contrasting sediments collected during high- (November 2011) and low- (March 2012) flow conditions in the Amous River, that received AMD. Distinct bacterial communities thrived in the two sediments, dominated by Rhodobacter spp., Polaromonas spp. and Sphingomonads. These communities included only few bacteria known for their capacity to interact directly with As, whereas biogeochemical processes appeared to control As cycling. Major As mobilisation occurred in the AsIII form at 20°C in anoxic conditions, from both November and March sediments, as the result of successive biotic reductive dissolution of Mn- and Fe-oxyhydroxides. The later process may be driven by Mn- and Fe-reducing bacteria such as Geobacter spp. and possibly occurred in combination with microbially mediated AsV reduction. The involvement of other bacteria in these redox processes is not excluded. Biomethylation occurred only with the sediments collected at low-flow during oxic and anoxic conditions, although no bacteria characterised so far for its ability to methylate As was identified. Finally, sorption equilibrium of AsV onto the sediment appeared to be the main process controlling AsV concentration in oxic conditions. Comparison with field data shows that the later process, besides biomethylation, may be of relevance to the As fate in AMD-affected streams.

Using red mud bauxite for the neutralization of acid mine tailings: a column leaching test

2006 ◽  
Vol 43 (11) ◽  
pp. 1167-1179 ◽  
Author(s):  
M Paradis ◽  
J Duchesne ◽  
A Lamontagne ◽  
D Isabel
Keyword(s):  
Acid Mine Drainage ◽  
Red Mud ◽  
Mine Drainage ◽  
Field Investigation ◽  
Drainage Water ◽  
Leaching Test ◽  
Column Leaching ◽  
Acid Mine ◽  
Column Leaching Test ◽  
Set Up

Acid mine drainage (AMD) is an environmental problem produced when sulphides come in contact with an oxidant (± bacteria) and water, producing acid generation and metals leaching. One solution proposed is to use red mud bauxite (RMB), which is very alkaline, to neutralize oxidized acidic tailings. A column leaching test has been set up to evaluate major aspects of field constraints. First, a field investigation was conducted in which RMB was spread in aggregates before mixing with tailings. This setup has been reproduced in the laboratory and compared with a homogeneous mixture. The analyses of the water effluent do not show any important difference between the two mixtures. Second, some studies show that the addition of Cl brine to RMB helps to maintain the long-term neutralization potential. Brine addition increased the concentrations of Ca, Mg, Na, K, and Cu in drainage water. Columns were set up with 10% and 20% RMB to evaluate the effect of the quantity applied. Addition of greater than 20% RMB increases the leachate alkalinity and concentrations of Al, Cu, Pb, As, Fe, and SO42– in drainage waters. The addition of 10% RMB, however, significantly improves the quality of drainage water over a period of 125 days and results in concentrations and pH values within the ranges of those recommended by Directive 019 of the Ministère de l'environnement, Québec.Key words: acid mine drainage, red mud bauxite, tailings, environmental geochemistry, neutralization.

Dissolved and particulate metals and arsenic species mobility along a stream affected by Acid Mine Drainage in the Iberian Pyrite Belt (SW Spain)

2012 ◽  
Vol 27 (10) ◽  
pp. 1944-1952 ◽  
Author(s):  
Aguasanta M. Sarmiento ◽  
Manuel A. Caraballo ◽  
Daniel Sanchez-Rodas ◽  
José Miguel Nieto ◽  
Annika Parviainen
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Arsenic Species ◽  
Iberian Pyrite Belt ◽  
Sw Spain ◽  
Acid Mine ◽  
Particulate Metals ◽  
Species Mobility

scholarly journals TEKNOLOGI PENGOLAHAN AIR ASAM TAMBANG BATUBARA “Alternatif Pemilihan Teknologi”

2018 ◽  
Vol 7 (2) ◽  
Author(s):  
Nusa Idaman Said
Keyword(s):  
Acid Mine Drainage ◽  
Flow Rate ◽  
Active Treatment ◽  
Mine Drainage ◽  
Passive Treatment ◽  
Low Flow ◽  
Active Systems ◽  
Acid Mine ◽  
Reducing Conditions ◽  
Suitable Treatment

Acid Mine Drainage (AMD) treatment systems can be broadly categorised as either active or passive systems, which differ according to their ability to handle Acidity, flow rate and Acidity Load of the influent AMD.  Most passive and active systems utilise aggregate carbonate to neutralise the pH and encourage precipitation of metals as hydroxides or sulphide minerals.  In addition, passive treatment systems often use organic matter to provide alkalinity and create reducing conditions which favour the precipitation of metal sulphides.Active treatment systems can be engineered to accommodate essentially any acidity, flow rate and acidity load. Active treatment of AMD can be achieved using fixed plants or portable equipment for in-situ treatment. Passive treatment systems are almost invariably used for post closure treatment scenarios, and are best suited to AMD with low Acidity and low flow rates. The key factors in selection and design of active and passive AMD treatment systems are water chemistry including pH, metals, sulphate levels and redox state and flow rate of influent AMD, and the objectives of AMD treatment. Other important factors include capital and operating costs, availability of suitable treatment reagents or materials and sludge management issues. Keywords: Acid Mine Drainage, Active Treatment, Passive Treatment, Coal Mining.

scholarly journals Phytoremediation and Nanoremediation : Emerging Techniques for Treatment of Acid Mine Drainage Water

2018 ◽  
Vol 3 (2) ◽  
pp. 190 ◽  
Author(s):  
Pratyush Kumar Das
Keyword(s):  
Acid Mine Drainage ◽  
Mine Water ◽  
Mine Drainage ◽  
Anthropogenic Activities ◽  
Drainage Water ◽  
Environmental Pollutant ◽  
Water Drainage ◽  
Mining Sites ◽  
Acid Mine ◽  
The Cost

<p>Drainage from mining sites containing sulfur bearing rocks is known as acid mine drainage (AMD). Acid mine drainage water is a serious environmental pollutant that has its effects on plants, animals and microflora of a region. Mine water drainage mainly occurs due to anthropogenic activities like mining that leave the sulfur bearing rocks exposed. This drainage water poses as a potent soil, water and ground water pollutant. Although a lot of remediation measures have been implemented in the past but, none of them have been able to solve the problem completely. This review intends to focus on new emerging and better techniques in the form of phytoremediation and nanoremediation for treatment of acid mine drainage water. Besides, the review also gives more importance to the phytoremediation technique over nanoremediation because of the cost effectiveness and eco-friendly nature of the first and the nascent status of the latter. A hypothetical model discussing the use of hyperaccumulator plants in remediation of acid mine water has been proposed. The model also proposes natural induction of the phytoremedial ability of the plants involved in the remediation process. The proposed model assisted by inputs from further research, may be helpful in proper treatment of acid mine drainage water in the near future.</p>

scholarly journals Microbiological and chemical evaluation of acid mine drainage from mining sites in Southwestern, Nigeria

2021 ◽  
Vol 15 (2) ◽  
pp. 158-165
Author(s):  
Ajayi Funmi Agnes ◽  
Fatoye Abiodun Olaniyi
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Morphological Characterization ◽  
Southwestern Nigeria ◽  
Mining Sites ◽  
Acid Mine ◽  
Chemical Evaluation ◽  
Plating Method ◽  
Contaminated Streams

Microbial content of acid mine drainage effluents contaminated streams from some geographical areas was evaluated. Water was obtained from acid mine drainage sites in Ekiti and Osun state where twelve (12) samples were obtained from different locations. Culture plating method was used to analyze the samples for bacteria, and Atomic Absorption Spectrophotometer (AAS) was used to determine heavy metals such as Cd, Co, Pb, Cr, Zn, Cu and Mn. The results of biochemical and morphological characterization of the isolates revealed three probable bacterial from the samples which are Bacillus subtilis, Pseudomonas spp. and Staphylococcus aureus; B. subtilis being the bacteria with the highest percentage frequency of occurrence. Heavy metals analysis of the mine drains shows that the concentration of Cd, Co, Pb, Cr and Zn exceeded permissible limit set by WHO except Cu and Mn. The results of this study established the presence of bacterial and heavy metals in acid mine drainage sites, which is an indication that the acid mine effluents are contaminated. It is therefore essential for proper dissemination of information concerning the dangers these microbes and heavy metals could pose to human.

Experimental and model studies on comparison of As(III and V) removal from synthetic acid mine drainage by bone char

2014 ◽  
Vol 78 (1) ◽  
pp. 73-89 ◽  
Author(s):  
Jing Liu ◽  
Xi Huang ◽  
Juan Liu ◽  
Weiqing Wang ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Low Cost ◽  
Arsenic Species ◽  
Breakthrough Curves ◽  
Filling Material ◽  
Bone Char ◽  
Acid Mine ◽  
Adsorption Capacities ◽  
Adsorption Cycle

AbstractAcid mine drainage (AMD) commonly contains elevated concentrations of As(III) and/or As(V) due to oxidation of arsenic-containing sulfides. Bone char has been used as a low-cost filling material for passive treatment. The breakthrough curves of As(III) and As(V) were studied in column experiments conducted at different flow rates, adsorption cycle times, and with different coexisting cations and anions to compare their transport behaviours. The experimental data were fitted by the Convection- Diffusion Equation (CDE) and Thomas model with the aim of obtaining retardation factors of As(III) and As(V) and their maximum adsorption capacities, respectively. The maximum adsorption capacities of As(III) and As(V) are 0.214 and 0.335 mg/g, respectively. Coexisting Mn2+ and Al3+ ions can shorten the equilibrium time of As(V) adsorption from 25 h to 8 h, but they have little effect on As(III). The retardation factors of As(III) and As(V) calculated by the CDE model decrease with adsorption cycles from 37 to 20 and 51 to 32, respectively. The Mn2+ and Al3+ ions could enhance retention ability with adsorption cycle time, especially Mn2+ for As(V). Secondary adsorption phenomena were observed only in breakthrough curves of As(V) in the presence of Mn2+ and Al3+. The competitive influences of coexisting arsenic species is As(V) > As(III). Regeneration experiments using distilled water and NaOH solution were completed to quantify the degree of desorption of both As(III) and As(V). The results show that As(V) adsorbed on bone char has better desorption performance than As(III), and the average degrees of desorption of As(III) and As(V) for three desorption experiments are 75% and 31%, respectively.

Preserving the Distribution of Inorganic Arsenic Species in Groundwater and Acid Mine Drainage Samples

2002 ◽  
Vol 36 (10) ◽  
pp. 2213-2218 ◽  
Author(s):  
A. J. Bednar ◽  
J. R. Garbarino ◽  
J. F. Ranville ◽  
T. R. Wildeman
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Inorganic Arsenic ◽  
Arsenic Species ◽  
Acid Mine ◽  
Inorganic Arsenic Species
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