Evaluation of Pore Volume, Connectivity and Clogging of Previous Concrete Reactive Barrier in Treatment of Acid Mine Drainage

2021 ◽  
Author(s):  
Stephen O. Ekolu ◽  
Fitsum Solomon ◽  
Frikkie de Beer ◽  
Louisette Bitandi ◽  
Rais N. Kilula ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Pore Volume ◽  
Mine Drainage ◽  
Permeable Reactive Barrier ◽  
Pervious Concrete ◽  
Permeability Test ◽  
Reactive Barrier ◽  
Acid Mine ◽  
Treated Effluent ◽  
Pore Clogging

Abstract It has recently been shown that pervious concrete is a promising, effective technology as permeable reactive barrier for treatment of acid mine drainage (AMD). However, pore clogging also occurs simultaneously during AMD treatment. In the present study, mixtures of pervious concrete were made and used in a column experiment during which pore clogging occurred in the samples. Pore volume, connectivity and other parameters of pervious concrete were evaluated using five (5) different methods comprising the volumetric method (VM), linear – traverse method (LTM), image analysis (IA), falling head permeability test and X - ray micro - computed tomography. It was found that pervious concrete effectively removed from AMD, about 90 to 99% of various heavy metals including Al, Fe, Zn, Mn and Mg. Cr concentration significantly increased in the treated effluent, owing to leaching from cementitious materials used in mixtures. The VM and LTM gave statistically similar pore volume results, while IA’s values were 20 to 30% higher than those of the conventional methods. The falling head permeability test and IA were found to be effective in quantifying pore clogging effects. Pervious concrete exhibited high pore connectivity of 95.0 to 99.7%, which underlies its efficacious hydraulic conductivity.

Geochemistry of a Permeable Reactive Barrier for Metals and Acid Mine Drainage

1999 ◽  
Vol 33 (16) ◽  
pp. 2793-2799 ◽  
Author(s):  
S. G. Benner ◽  
D. W. Blowes ◽  
W. D. Gould ◽  
R. B. Herbert, ◽  
C. J. Ptacek
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Permeable Reactive Barrier ◽  
Reactive Barrier ◽  
Acid Mine

In-situ remediation of acid mine drainage using a permeable reactive barrier in Aznalcóllar (Sw Spain)

2011 ◽  
Vol 191 (1-3) ◽  
pp. 287-295 ◽  
Author(s):  
Oriol Gibert ◽  
Tobias Rötting ◽  
José Luis Cortina ◽  
Joan de Pablo ◽  
Carlos Ayora ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Permeable Reactive Barrier ◽  
In Situ Remediation ◽  
Reactive Barrier ◽  
Sw Spain ◽  
Acid Mine

scholarly journals A systematic mapping study on the development of permeable reactive barrier for acid mine drainage treatment

2019 ◽  
Vol 268 ◽  
pp. 06019
Author(s):  
April Anne Tigue ◽  
Roy Alvin Malenab ◽  
Michael Angelo Promentilla
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Permeable Reactive Barrier ◽  
Systematic Mapping Study ◽  
Systematic Mapping ◽  
Remediation Technology ◽  
Reactive Barrier ◽  
Acid Mine ◽  
Acid Mine Drainage Treatment ◽  
Reactive Media

Acid mine drainage is a result of exposure of sulfide ore and minerals to water and oxygen. This environmental pollutant has been considered the second biggest environmental problem after global warming. On the other hand, permeable reactive barrier is an emerging remediation technology which can be used to treat acid mine drainage. However, the effectiveness of this proposed remediation technology greatly depends on the reactive media. Also, treatment of acid mine drainage using permeable reactive barrier is still in the infancy stage, and long-term performance is still unknown. Hence, this study was conducted to identify what have been studied, addressed and what are currently the biggest challenges and limitations on the use of permeable reactive barrier for acid mine drainage treatment. Through systematic mapping approach, the results have shown that the reactive media used in permeable reactive barrier can be categorized into five namely iron-based, organic-based, inorganic minerals-based, industrial waste-based, and combined media. The data revealed that majority of the papers which is about 40% use combined media as the reactive substrate. The future direction is toward the use of combined media as a reactive material for AMD treatment, for instance, use of geopolymer with mine tailings and silts as reactive media in combination with organic-based media

Treatment of Simulated Acid Mine Drainage by Permeable Reactive Barrier: Column Study

2014 ◽  
Vol 989-994 ◽  
pp. 966-969
Author(s):  
Chang Feng Cai ◽  
Fu Zhang Qi ◽  
Xiao Liang Lin ◽  
Lin Jiang
Keyword(s):  
Acid Mine Drainage ◽  
Metal Ions ◽  
Removal Efficiency ◽  
Mine Drainage ◽  
Permeable Reactive Barrier ◽  
Inlet Velocity ◽  
Reactive Barrier ◽  
Treatment Performance ◽  
Acid Mine ◽  
Reactive Media

Three polyvinyl chloride (PVC) columns filled with different ratios of reactive media, ceramsite and corncob, were conducted to assess the treatment performance of simulated acid mine drainage (AMD). The results indicated that the columns could effectively remove sulfate and metal ions from AMD with the removal efficiency of 57.7% and 96.5% respectively. The removal efficiency decreased with the increasing inlet velocity and at the same sample ports the sulfate and metal ions concentrations at the velocity of 1 ml/min were lower than that at the velocity of 2ml/min and 3ml/min.

scholarly journals Quality of water recovered by treating acid mine drainage using pervious concrete adsorbent

Water SA ◽  
2019 ◽  
Vol 45 (4 October) ◽  
Author(s):  
AN Shabalala ◽  
SO Ekolu
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Permeable Reactive Barrier ◽  
Pervious Concrete ◽  
Silica Sand ◽  
Reactive Material ◽  
Acid Mine

In this paper, a batch experiment was conducted to evaluate the water quality obtained from using pervious concrete (PERVC) technology to treat acid mine drainage (AMD). The study proposes an innovative application of PERVC as a permeable reactive barrier liner in evaporation ponds. The effectiveness of PERVC adsorbent in removing heavy metals was compared with that of zero-valent iron (ZVI) of particle size 1.0 to 1.8 mm. The AMD used in the study was obtained from abandoned gold and coal mines. PERVC mixtures consisted of granite aggregate and ordinary Portland cement CEM I 52.5R (CEM I) or CEM I containing Class F 30% fly ash (30%FA) as a cement replacement material. ZVI was prepared from a mixture of silica sand and iron grit of specific sizes. PERVC and ZVI media were used to conduct batch reactor tests with AMD, for a period of 43 days at a ratio of 1 L of reactive material to 3 L of AMD. The quality of treated AMD was compared against effluent discharge standards. The contaminants Al, Fe and Zn were effectively removed by both PERVC and ZVI. Also, both adsorbents reduced Ni, Co and Cu to levels below those measured in raw AMD. However, PERVC was more effective in removing Mn and Mg while ZVI was ineffective. Although PERVC removed more heavy metals and with greater efficiency than ZVI, the PERVC-treated water showed high pH levels and exhibited elevated Cr6+ concentrations, owing to leaching from the cement and fly ash materials used in PERVC mixtures.

Sign in / Sign up

Export Citation Format

Share Document