Review Article
Removal of Organic Matter from Landfill Leachate by Advanced Oxidation Processes: A Review
Table 1
Landfill leachate classification versus age [
3,
4].
| | Type of leachate | Young | Intermediate | Old |
| | Age (years) | <5 | 5–10 | >10 | | pH | <6.5 | 6.5-7.5 | >7.5 | | COD (mg/L) | >10,000 | 4000–10,000 | <4000 | | BOD5/COD | 0.5–1.0 | 0.1–0.5 | <0.1 | | Organic compounds | 80% volatile fatty acids (VFA) | 5%–30% VFA + humic and fulvic acid | Humic and fulvic acids | | Ammonia nitrogen (mg/L) | <400 | N.A | >400 | | TOC/COD | <0.3 | 0.3–0.5 | >0.5 | | Kjeldahl nitrogen (g/L) | 0.1-0.2 | N.A | N.A | | Heavy metals (mg/L) | Low to medium | Low | Low | | Biodegradability | Important | Medium | Low |
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