scholarly journals Treatment of Acid Mine Drainage (AMD) using industrial by-product: Sorption behavior of steel slag for metal-rich mine water

2020 ◽  
Keyword(s):  
Acid Mine Drainage ◽  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Contact Time ◽  
Mine Drainage ◽  
Steel Slag ◽  
Batch Adsorption ◽  
Sorption Behavior ◽  
Adsorbent Dosage ◽  
Acid Mine

<p>This study highlights the potential of steel slag, which is an industrial by-product of steel making industry as treatment media for metal-rich acid mine drainage (AMD). A series of batch adsorption studies has been done to demonstrate the effects of contact time, solution pH, initial concentration of metal, adsorbent dosage and size, and the effect of competing ions on the performance of steel slag. Results indicated that metal removal efficiencies were found to be &gt;90% when pH of AMD has reached near-neutral state (6.8-7.5) that were mostly occurring within the first 14 hours of contact time. Optimum equilibrium time was found at 24 hours, i.e. 99-100% of metals were removed. An increased adsorption capacity with decreased removal efficiency was observed as initial metal concentration increased. In contrast, increasing adsorbent dosage leads to increased removal efficiency. Fe was not affected despite the presence of other metal ions (100% removal) compared to Mn (59.3% removal) in mixed AMD solution. Adsorption behavior of Fe, Cu, Zn and Mn fits appropriately with Langmuir isotherm model with adsorption capacity of 1.06, 1.03, 0.97 and 0.73 mg g-1, respectively. The adsorption kinetics followed the pseudo-second-order kinetics and is supported by intra-particle diffusion process. Therefore, steel slag can be potentially used as an effective media for passive AMD remediation.</p>

scholarly journals Response surface methodology approach for the optimisation of adsorption of hydrolysed polyacrylamide from polymer-flooding wastewater onto steel slag: a good option of waste mitigation

2017 ◽  
Vol 76 (4) ◽  
pp. 776-784 ◽  
Author(s):  
Mijia Zhu ◽  
Jun Yao ◽  
Zhonghai Qin ◽  
Luning Lian ◽  
Chi Zhang
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Removal Efficiency ◽  
Contact Time ◽  
Interactive Effect ◽  
Steel Slag ◽  
Oxygen Demand ◽  
Polymer Flooding ◽  
High Concentration ◽  
Adsorbent Dosage

Wastewater produced from polymer flooding in oil production features high viscosity and chemical oxygen demand because of the residue of high-concentration polymer hydrolysed polyacrylamide (HPAM). In this study, steel slag, a waste from steel manufacturing, was studied as a low-cost adsorbent for HPAM in wastewater. Optimisation of HPAM adsorption by steel slag was performed with a central composite design under response surface methodology (RSM). Results showed that the maximum removal efficiency of 89.31% was obtained at an adsorbent dosage of 105.2 g/L, contact time of 95.4 min and pH of 5.6. These data were strongly correlated with the experimental values of the RSM model. Single and interactive effect analysis showed that HPAM removal efficiency increased with increasing adsorbent dosage and contact time. Efficiency increased when pH was increased from 2.6 to 5.6 and subsequently decreased from 5.6 to 9.3. It was observed that removal efficiency significantly increased (from 0% to 86.1%) at the initial stage (from 0 min to 60 min) and increased gradually after 60 min with an adsorbent dosage of 105.2 g/L, pH of 5.6. The adsorption kinetics was well correlated with the pseudo-second-order equation. Removal of HPAM from the studied water samples indicated that steel slag can be utilised for the pre-treatment of polymer-flooding wastewater.

scholarly journals Enhanced Monovalent Cation Biomineralization Ability by Quartz Sand for Effective Removal of Soluble Iron in Simulated Acid Mine Drainage

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 732
Author(s):  
Heru Wang ◽  
Mengying Li ◽  
Yongwei Song
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Removal Efficiency ◽  
Quartz Sand ◽  
Mine Drainage ◽  
Monovalent Cation ◽  
Iron Minerals ◽  
Precipitation Efficiency ◽  
Acid Mine ◽  
Effective Removal

Acid mine drainage (AMD) is characterized by low pH, high soluble Fe, and heavy metal concentrations. Conventional lime neutralization produces large amounts of Fe(OH)2 and Fe(OH)3, which complicate subsequent disposal. Secondary iron minerals synthesized by biomineralization can reduce the concentration of soluble Fe in addition to adsorbing and removing heavy metals in AMD. Therefore, an appropriate method for improving the precipitation efficiency of Fe is urgently needed for AMD treatment. Using simulated AMD, this work analyzes the influence of quartz sand (40 g/L) on the Fe2+ oxidation and total Fe deposition efficiencies, as well as the phases of secondary iron minerals in an Acidithiobacillus ferrooxidans system including K+, Na+, or NH4+ (53.3 mmol/L). Quartz sand had no significant effect on Fe2+ oxidation and 160 mmol/L Fe2+ was completely oxidized by A. ferrooxidans in 168 h, but contributed to the oxidized product (Fe3+) mineralization, improving the total Fe removal efficiency in simulated AMD. Compared with treatments involving K+ or Na+ alone, quartz sand improved the total Fe precipitation efficiency by 26.6% or 30.2%, respectively. X-ray diffraction showed that quartz sand can promote the transformation of the biomineralization pathway from schwertmannite to jarosite with higher yields, which is important for improving the removal efficiency of heavy metals in AMD.

Alkalinity production as an indicator of failure in steel slag leach beds treating acid mine drainage

2012 ◽  
Vol 67 (5) ◽  
pp. 1389-1395 ◽  
Author(s):  
Natalie A. Kruse ◽  
Amy L. Mackey ◽  
Jennifer R. Bowman ◽  
Kimberly Brewster ◽  
R. Guy Riefler
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Steel Slag ◽  
Acid Mine

scholarly journals A technology review on treatment of acid mine drainage with bentonite–steel slag composite

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Le Tong ◽  
Ronggui Fan ◽  
Shuangchun Yang ◽  
Qiushi Zhang ◽  
Yi Pan
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Physical Adsorption ◽  
Research Question ◽  
Steel Slag ◽  
Treatment Method ◽  
Physicochemical Characteristics ◽  
Adsorption Method ◽  
Acid Mine ◽  
Multicomponent Composite

AbstractAcid mine drainage (AMD) which produced in the process of mining seriously pollutes the water resources and endangers the ecological environment due to its physicochemical characteristics, such as low pH, high salinity and high heavy metal concentrations. In recent decades, the treatment of AMD has become a key issue in the field of environmental protection. One important method of AMD treatment is adsorption method, and the selection of adsorbent is the key of this technique. Bentonite and steel slag are usually sintered at high temperatures to prepare bentonite–steel slag composite. AMD treatment with bentonite–steel slag composite, as a new adsorbent, is emerging as a promising treatment method by physical adsorption, ion exchange and chemical neutralization. The bentonite–steel slag composites mainly include bicomponent composite with bentonite–steel slag and multicomponent composite with bentonite–steel slag modifier. The author found that this important research question was rarely paid attention to, therefore, and the author combined with previous research and theories to promote the explanation of this problem. In this review, the technology of treatment of AMD with bentonite–steel slag composite is comprehensively discussed. Also, the role of its mechanism is also discussed in-depth. This paper provides a scientific reference on the remediation of contaminated environments.

scholarly journals Bioremediation of acid mine drainage and crude contaminated soils

2020 ◽  
Author(s):  
◽  
Yusuf Makarfi Isa
Keyword(s):  
Acid Mine Drainage ◽  
Crude Oil ◽  
Removal Efficiency ◽  
Contaminated Soils ◽  
Mine Drainage ◽  
Metal Removal ◽  
Air Injection ◽  
Treatment System ◽  
Acid Mine ◽  
Removal Efficiencies

Pollution is one of the greatest ills plaguing the existence of the ecosystem which could lead to the annihilation of terrestrial and aquatic habitat if not remedied. Acid mine drainage (AMD) and crude oil are among the major land and water pollutants cause by industrial and human activities. The constant exploration, mining, and processing of mineral resources and prevalent use of petroleum products for economic purposes have contributed to contamination of soil and proximate water bodies which results in environmental degradation; thus, remediation becomes necessary. The treatment of AMD contaminated soils using the conventional methods has some room for improvement to meet the remediation purpose. Bioremediation technology provides a sustainable and eco-friendly approach to the treatment of contaminants. This study aims to evaluate the performance of different potential bioremediation techniques and conduct a comparative analysis of these methods for the treatment of AMD and crude oil-contaminated soils. The treatment approach for both pollutants comprises of soils separately contaminated with AMD and crude oil before the application of bioremediation techniques. For the biostimulation study, contaminated soils were amended with varying ratios of the brewery or municipal wastewaters (BWW and MWW), while the bioventing (BVT) treatment involved wastewater amendment and supply of atmospheric air from the vadose zone at 3L/min at 30 minutes intervals every 48 hours. The bacteria strain Pseudomonas aeruginosa ATCC 15442 used for the study which was inoculated at 5%(w/w) was cultured in two different media for respective treatments and wastewater was amended as an extra energy source for bioaugmentation (BAU) study while Bioattenuation (BAT) which received no amendment was used as a control treatment for the study. The treatments were conducted in plastic bioreactors under mesophilic conditions for 28 days and samples were collected from each treatment system on weekly basis to analyse for sulfate, heavy metals, and total petroleum hydrocarbon (TPH) reduction. The result of the study showed that the amendment of contaminated soils with wastewater increased alkalinity in the system which enhanced microbial activities for effective remediation which recorded 52.43 and 51.23% average TPH and metal removal efficiency for the BSTc treatment. Also, the combined application of bioremediation techniques was more effective than single application as the introduction of oxygen into the treatment system with wastewater amendment increased the TPH and metal removal efficiency by an average of 12.98 and 13.17% respectively but efforts to enhance sulfate removal by air-injection (BVTa) proved abortive with 17.20 and 14.67% removal efficiencies less than BSTa and BAUa respectively as sulfate-reducing bacteria thrive in an anaerobic environment. However, P. aeruginosa ATCC 15442 adopts the sorption process in the reduction of hydrocarbon and metal toxicity with 42.02 and 41.81% average removal efficiencies respectively and the amendment extra nutrient (wastewater) increased the removal efficiency of these pollutants by 25.24 and 16.23% respectively. The results of the study inferred that wastewater (BWW and MWW), air-injection and P. aeruginosa ATCC 15442 showed great potentials in the degradation and removal of TPH, metals and sulfate contaminants, hence, can serve as a viable strategy for the remediation of AMD and crude oil polluted soils while improving waste management and amelioration of pollution aftermath faced by communities involved in mining and oil production and/or processing. There is a need for optimization to ensure effective remediation while further study is required to validate large scale application.

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