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4Selection items
6Steps
1FAQs
GBStandards cited
Summary: Fly ash concentrates heavy metals and dioxins and is classified as hazardous waste. Its landfill zone uses the highest liner grade: double >=2.0 mm HDPE membranes with an intermediate leak detection layer plus GCL, per GB 18597 / GB 18598 control philosophy.
Selection Table
| Position / function | Recommended material | Standard |
|---|---|---|
| Upper primary liner | 2.0 mm double-textured HDPE | GB/T 17643-2025 |
| Leak detection layer | Geonet + pipes / observation wells | GB/T 40441-2021 |
| Lower backup liner | 2.0 mm HDPE | GB/T 17643-2025 |
| Self-healing sub-layer | GCL 6000 g/m2 | JG/T 193-2006 |
Installation Steps
- Basin acceptance and GCL laying
- Lay and test lower membrane
- Install detection layer and wells, run flow test
- Lay upper membrane, 100% weld testing
- Slope anchoring and flood diversion
- Zoned filling with temporary membrane protection and traffic mats
