BUILDING UTILITIES 1 SEWAGE DISPOSAL SYSTEM
SEWAGE AND ITS DISPOSAL Collection and safe disposal of human waste are critical problems of environmental health. When human wastes are deposited in a pit, disease-causing organisms do not move horizontally in the soil or move by itself; it is carried through water flows pests and other vermin, thus, causing contamination. 50% of sewage solids is organic and subject to rotting; as it decomposes, it becomes odorous and dark in color. Fresh or stale, it contains harmful organisms which causes diseases. Sewage is a poisonous liquid waste that must be disposed of before used water can be returned to the environment. In order to make the sewage non-toxic, it is broken down into water, gases, and solids.
Sewage Disposal System A system for the treatment and disposal of domestic sewage by means of a structure or mechanical treatment, all designed to serve a single establishment, development or building.