Parameter

(per 1 m3 of treated water)

WWTP1

Na

WWTP2

La

WWTP3

Ph

WWTP4

Iz

Inputs

Total electricity (kWh)1

2.13

0.4454

0.811

0.615

Chlorine (kg)1

0.1263

2.15E−02

.0060

0.0869

Polymer (kg)1

−−−

0.02204

0.3590

−−−

Truck use (tkm)

0.00068

0.0245

1.057

0.0035

Outputs

Energy recovery (kWh)

−−−

0.42

−−−

−−−

Avoided impacts

P as fertilizer avoided (kg)

−−−

0.06459

0.0305

−−−

Emissions to water (kg)

Biochemical oxygen demand

0.048

0.0153

0.002

0.00465

Chemical oxygen demand

0.025

0.02

0.02

0.04034

Total suspend solids

0.014

0.018

0.003

0.00811

Total nitrogen

0.028

0.01

0.00235

0.00546

Total phosphorus

0.0067

0.001

0.0026

0.004955

Mn

0.00019

0.00035

0.00035

0.0000427

Cu

0.000488

0.000043

0.000043

0.00026

Fe

0.00076

0.00013

0.00013

0.0001455

Pb

0.00082

0.00073

0.00073

0.0000689

Zn

0.0000557

0.000081

0.000081

0.0000325

Emissions to soil (kg)

Sludge (dry matter)

0.068

0.1293

5.28

0.0043

Cd

5.80E−06

0.000085

0.000085

As

5.12E−06

0.000075

0.000075

3.27E−07

Cu

0.000293

0.00043

0.00043

3.71E−07

Hg

3.89E−06

0.000057

0.000057

2.94E−07

Ni

2.86E−05

0.00042

0.00042

1.83E−06

Pb

5.73E−05

0.00084

0.00084

3.67E−06

Zn

0.0005123

0.0075

0.0075

3.27E−05

Emissions to air

Biogas produced in anaerobic digestion (m3)

−−−

2.054E−06

0.1251

−−−