septic tank

Question 1

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

Answer 1

septic tank

Question 2

 main function: is to liquefy and precipitate solid waste and purifying odorous materials

Answer 2

septic tank

Question 3

• solid matter is reduced in sizes and consequently changed in character
• sewage that was discharged into the tanks is retained

Answer 3

Digestion

Question 4

_* during its 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 ________

Answer 4

𝐬𝐥𝐮𝐝𝐠𝐞

Question 5

• The sludge accumulates at the bottom of the septic tank. Parts of the solids are formed into __________. Both the scum and the sludge are processed by anaerobic bacteria and transforming them into liquid and gases.

Answer 5

𝐬𝐜𝐮𝐦

Question 6

• septic tank therefore combines two processes

Answer 6

𝐬𝐞𝐝𝐢𝐦𝐞𝐧𝐭𝐚𝐭𝐢𝐨𝐧
𝐚𝐧𝐚𝐞𝐫𝐨𝐛𝐢𝐜 𝐝𝐞𝐜𝐨𝐦𝐩𝐨𝐬𝐢𝐭𝐢𝐨𝐧

Question 7

upper portion of the tank

Answer 7

𝐬𝐞𝐝𝐢𝐦𝐞𝐧𝐭𝐚𝐭𝐢𝐨𝐧

Question 8

accumulated sludge at the bottom

Answer 8

𝐚𝐧𝐚𝐞𝐫𝐨𝐛𝐢𝐜 𝐝𝐞𝐜𝐨𝐦𝐩𝐨𝐬𝐢𝐭𝐢𝐨𝐧

Question 9

Decomposition of organic matter from human waste is a bacteriological processed caused by

Answer 9

• aerobes
• anaerobes
• facultative bacteria

Question 10

 Aerobic bacteria
 life is in the presence of oxygen

Answer 10

aerobes

Question 11

 Anaerobic bacteria
 functions in the absence of free oxygen

Answer 11

anaerobes

Question 12

 can function even with or without the presence of oxygen

Answer 12

facultative bacteria

Question 13

These three types of bacteria have no relation to disease, they thrive naturally in sewage, and will function when condition are favorable in terms of;

Answer 13

 Food supply
 Temperature
 Moisture

Question 14

However even in favorable condition, these bacteria ceased to exist due to the presence of;

Answer 14

 Antiseptic or disinfectant
 large amount or volume of oil
 Large amount or volume of grease

Question 15

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. The process of 𝒅𝒆𝒄𝒐𝒎𝒑𝒐𝒔𝒊𝒕𝒊𝒐𝒏 is regarded as

Answer 15

𝒔𝒕𝒂𝒃𝒊𝒍𝒊𝒛𝒂𝒕𝒊𝒐𝒏

Question 16

 caused by anaerobic bacteria (putrefaction): accompanied by bad odor
 aerobic decomposition: not accompanied by unpleasant odor

Answer 16

Decomposition

Question 17

accompanied by bad odor

Answer 17

anaerobic bacteria (putrefaction)

Question 18

not accompanied by unpleasant odor

Answer 18

 aerobic decomposition

Question 19

 not less than 2/3 capacity of the total capacity of tank
 not less than 2 cum liquid capacity
 shall be at least 0.9 m width and 1.5 m long
 liquid depth not less than 0.6 m nor more than 1.8 m

Answer 19

First compartment

Question 19

 not less than 2/3 capacity of the total capacity of tank
 not less than 2 cum liquid capacity
 shall be at least 0.9 m width and 1.5 m long
 liquid depth not less than 0.6 m nor more than 1.8 m

Answer 19

First compartment

Question 20

First compartment
 not less than ___________capacity of the total capacity of tank
 not less than _________ liquid capacity
 shall be at least ______ width and ___ long
 liquid depth not less than___ nor more than __

Answer 20

2/3
2 cum
0.9 m / 1.5 m
0.6 m / 1.8 m

Question 21

 maximum capacity of 1/3 total capacity of tank
 minimum of 1 cum liquid capacity
 In septic tanks having over 6 cum capacity, the secondary compartment should be not less than 1.5 m in length.
 maintain a slope of 1:10 at the bottom of the digestion chamber to collect the sludge and make it easily accessible from the manhole

Answer 21

Secondary compartment

Question 22

Secondary compartment
 maximum capacity of _______ total capacity of tank
 minimum of______ liquid capacity
 In septic tanks having over ______ capacity, the secondary compartment should be not less than _______ in length.
 maintain a slope of _______at the bottom of the digestion chamber to collect the sludge and make it easily accessible from the manhole

Answer 22

1/3
1 cum
6 cum / 1.5 m
1:10

Question 23

 water tight receptacle which receives the discharge of a sanitary plumbing system or part thereof, designed and constructed to retain solids, digest organic matter through a period of detention

Answer 23

Septic Tank

Question 24

 to allow the liquids to discharge into the soil outside of the tank through a system of open-jointed sub-surface pipings or a seepage pit meeting the requirements of the National Plumbing Code

Answer 24

Septic Tank

Question 25

 with at least two (2) manholes, 508 mm in min dimension; one over inlet, other over outlet
 Wherever first compartment exceeds 3.7 m in length, an additional manhole required over the baffle wall.

Answer 25

Manholes

Question 26

 with at least _______ manholes, ____ in min dimension; one over inlet, other over outlet

 Wherever first compartment exceeds _______in length, an additional manhole required over the baffle wall.

Answer 26

two (2)
508 mm

3.7 m

Question 27

 diameter size not less than the sewer pipe

Answer 27

• Inlet and Outlet pipes

Question 28

• Vertical legs of inlet and outlet pipes
   diameter size not less than the sewer pipe nor less than ______

Answer 28

104.6 mm

Question 29

Length and location of inlet & outlet
 Shall extend ______ above and at least ___________ below the water surface
 Invert of the inlet pipe shall be at a level not less than _____ above the invert of the outlet pipe.

Answer 29

101.6 mm / 304.8 mm
50.8 mm

Question 30

 side walls shall extend 228.6 mm above liquid depth.
 Cover of septic tank shall be at least 50.8 mm above the back vent openings

Answer 30

Air space

Question 31

Air space
 side walls shall extend _______ above liquid depth.
 Cover of septic tank shall be at least ______ above the back vent openings

Answer 31

228.6 mm
50.8 mm

Question 32

 An inverted fitting equivalent in size to the tank inlet, but in no case less than 104.6 mm in diameter, shall be installed in the inlet compartment side of the baffle with the bottom of the fitting placed midway in the depth of the liquid.
 Wooden baffles are prohibited.

Answer 32

Partition (between compartments)

Question 33

Structure
 Shall be capable of supporting an earth load of not less than ____

Answer 33

14.4 kPa

Question 34

 An inverted fitting equivalent in size to the tank inlet, but in no case less than _________ in diameter, shall be installed in the inlet compartment side of the baffle with the bottom of the fitting placed midway in the depth of the liquid.

Answer 34

104.6 mm

Question 35

Location
- Should not be located ________ the house
- At least ________ from the water distribution system

Answer 35

underneath
15 meters

Question 36

1. For a family of six persons, the minimum tank capacity should be approximately ______ .

Answer 36

1.3 cubic meters

Question 37

MINIMUM WIDTH

Answer 37

90 CM

Question 38

MIN LENGTH

Answer 38

150 CM

Question 39

MIN DEPTH

Answer 39

120 CM

Question 40

For residential building to serve large number of people, allocate ________ of liquid per person

Answer 40

0.14 to 0.17 cu.m

Question 41

For small residential house to serve up to 12 persons, the chamber should have a liquid content of not more than ______

Answer 41

2.0 cu.m

Question 42

For school, commercial and industrial establishments, the volume of the septic tank should not be less than ______ or more than ______ per person

Answer 42

0.057 cu.m/ 0.86 cu.m