SEPTIC TANK

Septic Tank

a receptacle or vault used to collect organic waste discharged from the house sewer

sludge

During the septic tank’s retention period, about 60% to 70% of the suspended solid of the sewage is removed largely by sedimentation to form a semi-liquid substance called ____

scum

Parts of the solids are formed into floating ____

digestion

Both the scum and the sludge are processed by anaerobic bacteria and transforming them into liquid and gases

sedimentation

The septic tank has this process in the upper portion of the tank

Anaerobic decomposition

The septic tank has this process of the accumulated sludge at the bottom

Decomposition

___ of organic matter from human waste is a bacteriological process caused by:


1. Aerobic bacteria
2. Anaerobic bacteria
3. Facultative bacteria

aerobes

aerobic bacteria

Anaerobes

anaerobic bacteria

presence of material oxygen

the life process of Aerobic bacteria is in here

absence of free oxygen

the Anaerobic bacteria functions in here

Facultative bacteria

functions even with or without free oxygen

Stabilization

The process of decomposition.

The human waste or excreta are decomposed, until the organic matters are transformed into materials that could no longer be utilized by the bacteria in their life process

putrefaction

Decomposition caused by anaerobic bacteria and is accompanied by bad odors

aerobic decomposition

not accompanied by unpleasant odor

Septic

a sewage that turns dark and smell unpleasantly due to anaerobic decomposition

Methane gas

a combination of hydrogen and carbon, a principal component of natural gas

Carbon Dioxide

a combination of carbon and oxygen. It is the simplest oxide of carbon

Carbon Monoxide

a by-product of methane, classified as poisonous gas

Hydrogen

evolves as a moist gas from organic waste

Hydrogen sulfide

a colorless gas with offensive odor

Sulfur Dioxide

also a colorless gas having an irritating odor