Review Article
Treatment of Landfill Leachate Using Activated Sludge Technology: A Review
Table 1
Characteristics of landfill leachate with different periods.
| Leachate type | Early | Medium-term | Old |
| Landfill useful life (years) | <5 | 5–10 | >10 | pH (−) | 6.5–7.5 (7.0) | 7.0–8.0 (7.5) | 7.5–8.5 (8) | COD (g/L) | 10–30 (15) | 3–10 (5) | <3 (2) | BOD/COD (−) | 0.5–0.7 (0.6) | 0.3–0.5 (0.4) | <0.3 (0.2) | NH4+-N (mg/L) | 500–1000 (700) | 800–2000 (1000) | 1000–3000 (2000) | COD/NH4+-N | 5–10 (6) | 3-4 (3) | <3 (1.5) |
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The values in parentheses are typical values. |