A is false. Decomposition in a septic tank is an anaerobic, not aerobic, process.
B is false. A seepage pit must not be watertight. Liquid must be able to seep slowly out of the pit into the surrounding ground.
C is true. Anaerobic digestion of waste produces biogas and digested sludge that can be used as a fertiliser.
D is false. Runoff is rainwater running off the land but it may contain human and other types of waste that have been washed off the land surface. It can also cause flooding problems.
E is true. Human waste management must ensure the protection of groundwater from contamination.
Back to - SAQ 19.1 (tests Learning Outcomes 19.1, 19.2 and 19.3)