Secondary treatment
3.8840325
2.917562951
Secondary+other treatment
3.929648571
N removal
4.244006987
2.504732165
N removal+other treatment
3.58373956
P removal
2.020645074
P removal+other treatment
3.152397339
NP removal
3.011298687
1.878784048
NP removal+other treatment
0.529868333
1.954130997