scholarly journals Evaluation of plant growth on degraded mine soils amended with class F fly ash and animal manures

2011 ◽  
Vol 30 (1) ◽  
Author(s):  
Arina E. Potgieter ◽  
Wayne F. Truter
Keyword(s):  
Fly Ash ◽  
Crop Production ◽  
Mine Drainage ◽  
Ecological Impacts ◽  
Chicken Manure ◽  
Plant Production ◽  
Winter Rye ◽  
Degraded Land ◽  
Class F Fly Ash ◽  
Class F

The coal power generation, livestock production and coal mining industries are three of the largest roleplayers in South Africa’s economy and environment. These industries respectively produce huge volumes of fly ash, organic wastes and degraded land, resulting in both financial and ecological impacts. The need, therefore, exists to explore the recycling potential of fly ash, and combinations of fly ash with cattle and chicken manure. The aim of this study is to determine whether class F fly ash and combinations of class F fly ash with cattle and chicken manure can serve as alternative soil amendments to establish a more sustainable plant production system on degraded soils. Phytotron pot trials simulating the post-mining land capability class for pastures and fodder crop production, were planted with winter rye (Secale cereale), Japanese millet (Echinochloa frumentacea) and forage sorghum (Sorgum vulgare). Two soils, cover soil and acid mine drainage impacted soil (AMD), were amended with twelve treatment combinations at two different levels, optimum and 2X optimum. Treatments included combinations of agricultural lime, fertiliser, chicken manure, cattle manure, and class F fly ash.

scholarly journals Laboratory Study on the Effectiveness of Limestone and Cementitious Industrial Products for Acid Mine Drainage Remediation

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 413
Author(s):  
Abdellatif Elghali ◽  
Mostafa Benzaazoua ◽  
Hassan Bouzahzah ◽  
Bruno Bussière
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Mine Tailings ◽  
Ordinary Portland Cement ◽  
Mine Drainage ◽  
Secondary Phases ◽  
Environmental Matrices ◽  
Acid Mine ◽  
Class F Fly Ash ◽  
Class F

Acid mine tailings may affect several environmental matrices. Here, we aimed to stabilize acid-generated mine tailings using several alkaline and cementitious amendments, which were tested in columns for 361 days. The alkaline amendments consisted of 10 and 20 wt.% limestone, while the cementitious amendments consisted of different binders at a total dosage of 5 wt.% binder. The different formulations for the cementitious amendments were: 50% Kruger fly ash and 50% class F fly ash; 20% ordinary Portland cement, 40% Kruger fly ash, and 40% class F fly ash; 80% ordinary Portland cement and 20% Kruger fly ash; and 20% ordinary Portland cement, 40% Kruger fly ash, and 40% fly ash. Kinetic testing on the amendment formulations showed that the pH values increased from <2.5 to circumneutral values (~7.5). The mobility of various chemical species was greatly reduced. Cumulative Fe released from the unamended tailings was ~342.5 mg/kg, and was <22 mg/kg for the amended tailings. The main mechanisms responsible for metal(loid) immobilization were the precipitation of secondary phases, such as Fe-oxyhydroxides, physical trapping, and tailing impermeabilization.

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