Answer:
(a) If untreated sewage is
discharged directly into rivers it will lead to serious pollution of the waters
with organic matter and pathogenic bacteria, Protozoa and many other diseases.
This water, if used, will cause outbreaks
of water borne diseases.
(b) In anaerobic sludge
digestion, an aerobicbacteria, digest the aerobic bacteria and the fungi in the
sludge and the remaining organic matter.
During this digestion, bacteria
produce a mixture of gases such as methane, hydrogen sulphide and carbon
dioxide. These gases (biogas) can be used as source of energy as it is
inflammable.
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