# | Factor | Condition | Rank | Corresponding value |
1 | The removal efficiency of pollutants from wastewater | Not meeting local limits | L | 1 |
Meeting the local limits | M | 2 | ||
Below the local limits | H | 3 | ||
2 | Energy used/generated in the treatment processesa | Extensive energy consumption (>1.122 kWh/m3) | L | 1 |
Moderate energy consumption (0.38 - 1.122 kWh/m3) | M | 2 | ||
Passive system or energy-producing system | H | 3 | ||
3 | Sludge quality for useful utilization | Low-quality sludge containing pollutants (heavy metals, toxic substances) | L | 1 |
Sludge suitable for composting and/or landscape with complete treatment processes | M | 2 | ||
Sludge suitable for composting and/or landscape with simple treatment processes that do not require skilled labor | H | 3 |