Unit 3: Solid Wastes - Reclamation and Re-mediation of Spoil Heaps
- Created by: rosieevie
- Created on: 11-04-15 23:03
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- Reclamation and Re-mediation of Spoil Heaps (overburden from mining)
- Topography - steep slopes and angular shapes are ugly
- Landscaping used which requires more land
- Stability - uncompacted heaps may erode if building occurs
- Soil compaction and vegetation reduces this
- Drainage - may be needed to reduce landslide risk in heavy rain
- Lack of nutrients - especially sand/shale spoil
- Topsoil, sewage sludge or fertilisers added
- pH - sulfides may make sulfuric acid (spoil rarely too alkaline)
- Lime added to reduce acidity
- Toxic materials - may be immobilised with lime to maintain a pH in which they are insoluble (heavy metals)
- Petrochemical contamination - bacteria digest oil through bioremediation
- Toxic leachates - collected and treated to prevent them entering environment and water sources
- Vegetation penetrate deep into soil and reach toxic materials - prevented by application of deeper layers of soil
- Asbestos - toxic so double wrapped in heavy duty polythene bags in specialised landfill
- Cyanide - toxic enzyme inhibitor so must be incinerated
- Topography - steep slopes and angular shapes are ugly
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