Private Sewage Disposal Systems

Question 1

the final stage of the plumbing process;

where used water and water-carried wastes are brought to various disposal outlets

Answer 1

Disposal Phase

Question 2

A watertight covered receptacle designed and constructed to receive the discharge of sewage from a building sewer, separate solids from the liquid, digest organic matter and store digested solids through a period of detention, and allow the clarified liquids to discharge for final disposal

Answer 2

Septic Tanks

Question 3

solid organic matter that are denser than water

and settle at the bottom of the septic tank

Answer 3

Sludge

Question 4

lighter organic material that rise to the surface of

the water

Answer 4

Scum

Question 5

liquid content of sewage

Answer 5

Effluent

Question 6

Bacteria in septic tank to encourage decomposition; relies on oxygen to survive

Answer 6

Aerobic bacteria

Question 7

Bacteria in septic tank to encourage decomposition; can survive in places without oxygen

Answer 7

Anaerobic bacteria

Question 8

minimum dimensions of a septic tank

Answer 8

L= 1500mm
W=900mm
D=1200mm

Question 9

3 degrees or grades of waste water

Answer 9

Grey Water (or Area Water), Black Water, Storm Water

Question 10

2 TYPES OF SANITARY SEWERS

Answer 10

Tributary Sewers, Intercepting Sewers

Question 11

CLASSIFICATION OF SEWERS

Answer 11

Combination Public Sewers, Storm Sewers, Sanitary Sewers

Question 12

Termination points of individual units or structures Usually round shaped, with diameters between 0.60 to 1.2 meters Made of vitrified clay or cement pipes; often installed by the curb line, before the street sewers Normally laid in the Northern or Eastern side of streets with east-west or north-south orientations

Answer 12

Tributary Sewers

Question 13

a.k.a. ‘collecting sewers’ Termination points of tributary sewers Placed much lower in the ground, from 4 to 30 meters in depth Varies in shape but have a diameter or effective opening ranging from 0.60 to 3 meters Sloped at an angle of 1:50 or 2% Lifting stations are placed at certain intervals and pumps or sewage ejectors are used to lift the waste; sewers terminate at the disposal plant

Answer 13

Intercepting Sewers

Question 14

Private sewage disposal system common in rural areas for structures with large adjacent open fields

Answer 14

DISPOSAL FIELDS

Question 15

a loosely lined excavation in the ground, which receives the discharge of a septic tank; designed to permit effluent to seep through pit bottom and sides

Answer 15

SEEPAGE PITS

Question 16

a non-watertight lined excavation in the ground
which receives the discharge
of a sanitary drainage system,
designed to retain the organic
matter but permitting the liquid
to seep through the pit bottom
and sides

Answer 16

CESSPOOLS

Question 17

oldest form of disposal of
organic waste. Consists of a vault
constructed of concrete for the collection
of raw sewage and a wooden shelte

Answer 17

Outside Privy

Question 18

Involves a series of stations where the raw sewage must pass through

Answer 18

The Activated Sludge Process

Question 19

2 Most Common Types of

Municipal Sewage Treatment

Answer 19

The Activated Sludge Process The Trickling Filter Process

Question 20

a.k.a ‘Percolating or Sprinkling Filter System requires less mechanical elements and less stages Produces water with 95% purity Requires a large ground area for its building

Answer 20

The Trickling Filter Process