Sanitary System

Waste water stream

Treatment

Reuse

A

Composting Toilet/
Dry Toilet

Black water
(Decentralized)

Co-Composting with bulking material (aerobic)

Soil conditioner

Grey water
(Decentralized)

Sand filtration (aerobic)

Irrigation/
infiltration

B

Siphon toilet/
Water toilet

Black water
(Semi-decentralized)

Septic Tank – Pre-treatment (anaerobic);

Sand filtration – liquid phase (aerobic)

Service water/
infiltration

Sludge drying – solid phase (aerobic)

Soil conditioner

Grey water
(Decentralized)

Sand filtration (aerobic)

Service water/
infiltration

C

Public bathroom and public toilet

Black water
(Centralized)

Septic Tank – Pre-treatment (anaerobic);

Sand filtration – liquid phase (aerobic)

Service water/
infiltration

Sludge drying – solid phase (aerobic)

Soil conditioner

Grey water

Sand filtration (aerobic)

Service water/
infiltration

(Centralized)