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3Selection items
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GBStandards cited
Summary: Coal ash yards generate fluoride- and sulfate-bearing leachate under rainfall. The liner system uses 1.5 mm HDPE membrane with composite drainage geonet for leachate collection and a cover-soil protection layer, plus perimeter flood diversion for clean-dirty separation.
Selection Table
| Position / function | Recommended material | Standard |
|---|---|---|
| Base primary liner | 1.5 mm smooth HDPE | GB/T 17643-2025 |
| Leachate drainage | Composite geonet + collector pipes | GB/T 40441-2021 |
| Protection / filtration | 400 g/m2 staple geotextile | GB/T 17638-2017 |
Installation Steps
- Compact and level the yard base
- Lay staple geotextile cushion
- Lay 1.5 mm membrane, double-seam weld and sample test
- Install geonet and leachate collectors to collection pond
- Cover soil protection and staged ash stacking
- Perimeter diversion ditches and monitoring wells
