#

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