Private sewage Disposal System Flashcards
a septic tank into the subsurface disposal field, or seepage pits
PRIVATE SEWAGE DISPOSAL
a watertight receptacle which receives discharge of a sanitary plumbing system
SEPTIC TANK
a loosely lined excavation in the ground which receives the discharge of a septic tank
SEEPAGE PIT
a non-watertight lined excavation in the ground which receives the discharge of a sanitary drainage system or part there of
CESSPOOL
a cesspool that is not watertight
LEECHING CESSPOOL
an outhouse or structure used for the deposition of excrement
PRIVY
a pit beneath a privy where excrement collects
PRIVY VAULT
_______ are conducted to determine the absorption qualities of questionable soils
PERCOLATION TEST
What are the basis of DENR in approving if the bldg sewer may be connected to private sewage disposal system?
Location
Soil porosity
Ground water level
(LSG)
PD 856
SANITATION CODE OF THE PHILIPPINES
Septic tanks design shall produce a _________
clarified effluent
What is the minimum compartments of septic tank?
2
what is the recommended minimum compartment of septic tanks by LGU’s?
3
What is the liquid depth of septic tanks?
0.6 m-1.8m
What is the minimum inlet compartment of a septic tank?
2/3 of the septic tank
What is the minimum capacity of the first compartment of a septic tank?
2 cu.m
What is the minimum width of a septic tank?
0.90 m
What is the minimum length of the first compartment of a septic tank?
1.5m
What is the maximum outlet compartment of a septic tank?
1/3 of the septic tank
What is the minimum capacity of the secondary compartment of septic tank?
2 cu.m
What is the minimum length of the secondary compartment if septic tank has over 6 cu.m capacity?
1.5 m
What is the minimum size of the inlet and outlet pipe for septic tank?
Same as the size of connecting sewer pipe
What is the minimum number of manholes of a septic tank?
2
What is the minimum dimension of a manhole?
508 mm
How many manholes are over the inlet compartment?
1 manhole
How many manholes are over the outlet compartment?
1
Add 1 more manhole above the baffle wall if the first compartment exceeds _____ in length
3.7 m
What is the vertical clearance of inlet invert pipe above outlet invert pipe for septic tank?
50.8 mm (2”)
What is the vertical clearance of the cover of the septic tank above the back vent opening?
50.88 mm (2”)
How much is the extension of inlet and outlet pipe or baffle partitions between compartments above the water surface?
101.6 mm (4”)
What is the minimum vertical leg of the inlet and outlet fitting?
104.6 mm (4.1”)
What is the minimum inverted fitting installed in the inlet compartment side of the baffle??
104.6 mm (4.1”)
What is the minimum horizontal dimension of the baffle type fitting measured at the inlet and outlet pipe inverts?
106.6 mm (4.2”)
How much is the extension of side walls above the liquid depth?
228.6 (9”)
How much is the extension of the inlet and outlet pipe or baffle below the water surface?
304.8 mm (12”)
What is the minimum earth load support of septic tank cover when the maximum coverage does not exceed 9 m?
14.4 kpa
What is the minimum bituminous coating extension below the water line for concrete septic tanks and shall cover all of the internal areas above that point?
101.6 mm (4”)
What is the minimum wall thickness of any steel septic tank?
Gauge 12 US (2.8mm)
What are prohibited septic tanks and baffles?
Wooden septic tanks and baffles
what is the minimum area of trench bottom for disposal fields?
14 sqm
what is the sidewall area of disposal fields that may be added to the trench bottom?
304.8 mm to 914.4 mm
What is the maximum depth of excavation within a water table for a leach line or leach bed?
1.5 m
what is the raking depth of trenches before placing filter materials on drain lines, to remove compacted surfaces?
25.4mm (1”)
what is the *size of clean stone, gravel, slag, or similar filter material for a disposal field?
19.1 mm to 63.5 mm (3/4” to 2 1/2”)
What are approved filter materials put above the drain pipe to prevent closure of voids with earth backfill?
Untreated building paper, Straw, similar porous material
What is staked in the trench to the depth of the filter material as support for drain tile or flexible pipe which will maintain alignment?
GRADE BOARD
How much is the termination of filter material when seepage pits are used in combination with disposal fields?
1.5 m
What is needed for two or more drain lines to receive lateral lines?
DISTRIBUTION BOX
what is required if quantity of sewage exceeds 152.4 linear meter?
DOSING TANK
What is the interval of discharge of dosing tank via automatic siphon pump?
3 hrs or 4 hrs
What is the dosing capacity of a dosing tank at one time?
60% to 75%
How many siphons or pumps required if total length of pipe exceeds 304.8 m, each serving 1/2 of the reaching field?
2 siphons or pumps
What is the minimum number of drain lines per disposal field?
1
What is the maximum length of each line of the disposal field?
30.5 mm
what is the minimum bottom width of trench for disposal field?
457.2 mm
What is the maximum bottom width of trench for disposal field?
914.4 mm
What minimum spacing of distribution lines of disposal fields, center-to-center?
1.8m
What is the minimum depth cover of line of disposal field?
304.8mm
What is the preferred depth of earth cover of lines of disposal field?
457.2mm
what is the minimum grade of lines of disposal field?
level
What is the maximum grade of lines of disposal field?
25 mm/m
What is the minimum filter material under drain lines of disposal field?
304.8 mm
What is the minimum filter material over drain lines of disposal field?
50.8 mm
What is the minimum distance of Ieaching beds in a disposal field?
1.20 m
What is the maximum distance of perimeter of leaching bed to a distribution drain line?
0.90 m
On sloping grounds, to prevent excessive line slope, leach lines or beach beds shall be _________
stepped
What is the shape of a seepage pit?
circular/circle/round
What is the extension of vented leg fitting below the inlet fitting?
304.8 mm
What is the minimum diameter of seepage pits?
2.2m
Approval shall be obtained for excavated seepage pits with diameters greater than _________
1.8 m
What is the thickness of concrete wall for seepage pits?
101.6 mm
When to have chamfered matching ends of bricks on blocks for seepage pits?
greater than 304.8mm
What is the minimum depth of clean 19.1 mm gravel of a rock in the excavation voids behind the brick, block, or concrete liner?
152.4 mm
What is the minimum compressive strength of brick or blocks in seepage pits?
17225 kPa on 2500 psi
What is the minimum sidewall of seepage pits?
3 m
What is the maximum depth of excavation within a water table from a seepage pit?
3 m
What is the thickness of cement mortar of the arch or dome of any seepage pit, extending to at least 152.4 mm beyond the sidewalls?
50.8 mm
What is the earth load design of seepage pits?
19.2 kpa
What is the depth of top or arch or cover below the surface of the ground?
457.2 mm-1.2 m
What is the allowable discharge fitting when using a one or two piece concrete slab cover inlet?
1/4 bend fitting
Shall be considered only as a temporary expedient pending to construction of a public sewer
CESSPOOL
What is the minimum sidewall of cesspool?
6.1 m
What is the vertical clearance of the inIet above the outlet when overflow cesspools or seepage pits are added to existing installations?
152.4 mm
What is the clear height of tunnel above the distribution pipe?
0.6m
What is the maximum length of tunnel?
1/2 or 2.4 m depth of trench
trenches shall be back-filled in thin layers of _____ above the pipe with clean earth
0.3 m
what is the distance within property line that every abandoned bldg shall be capped or plugged?
1.5 m
What is the maximum days from connecting to the public sewer that the abandoned facility shall be filled etc.?
30 days
What is the minimum horizontal distance between any part of the leaching system when disposal fields and/or seepage pits are installed in sloping ground?
4.6 m
What is the clearance of drainage piping from domestic supply wells?
15.2 m
What is the allowable reduction in distance when drainage piping is construction of materials approved for use within a bldg ?
7.6 m
What is the waste flow rates for disposal facilities indicated with a dishwashing machine?
6 gallons (22.7L)
What is the waste flow rates for disposal facilities indicated without a dishwashing machine?
5 gallons (18.9L)
What is the waste flow rates for disposal facilities for single service kitchen?
2 gallons (7.6L)
What is the waste flow rates for disposal facilities of a food waste disposer?
1 gallon (3.8L)
What is the retention time for disposal facilities of commercial kitchen waste dishwasher?
2.5 hrs
What is the retention time for disposal facilities of single service kitchen single serving?
1.5 hrs
What is the retention time for disposal facilities of sand-silt-oil?
2 hrs
What is the retention time for disposal facilities of lint-silt(laundry)?
2 hrs
What is the storage factor for disposal facilities
What is the storage factor disposal facilities for fully equipped commercial kitchen for 8 hrs?
1
What is the storage factor disposal facilities for fully equipped commercial kitchen for 16 hrs?
2
What is the storage factor disposal facilities for fully equipped commercial kitchen for 24 hrs?
3
What is the storage factor for disposal facilities of single service kitchen?
1.5
What is the storage factor for disposal facilities of self-serve auto washers?
1.5
What is the storage factor for disposal facilities of employee-operated auto washers?
2
What is the storage factor for disposal facilities of laundries and laundromats?
1.5
The oldest type of public sewer that conveys both storm water and sanitary waste. This type is already obsolete and no longer allowed by sanitary authorities
COMBINATION PUBLIC SEWER
Type of public sewer facility that carries regular sanitary wastes only. It terminates in a modern sewage dispersal plant. Rainwater is not permitted to enter.
SANITARY SEWER
A type of sanitary sewer that conveys sanitary waste to a dispersal plant, commonly made of concrete pipe laid underground.
INTERCEPTING SEWER or TRUNK LINE SEWER
Type of sanitary sewer classified as an intercepting sewer branch, constructed of vitrified clay or concrete pipe laid in an open trench.
TRIBUTARY SEWER or CONTRIBUTING SEWER
Kind of public sewer line that carries storm water which terminates in a natural drain such as canals, lakes, or rivers
STORM DRAIN
Refers to the pump that will discharge waste in the sump and transfer it to the house drain installed overhead
SEWAGE EJECTOR
Refers to the semi-liquid substance that accumulates at the bottom of the septic tank
SLUDGE
Refers to the parts of the solids that are formed and floating on the septic tank
SCUM
What do you call the process where solid matter is reduced in sizes and consequently changed in character?
DIGESTION
What are the two processes combined within the septic tank?
SEDIMENTATION & PUTREFACTION
Sedimentation occurs in what portion of the septic tank?
Upper
What process occurs in the upper portion of the septic tank?
SEDIMENTATION
Anaerobic decomposition occurs in what portion of the septic tank?
Bottom
What process happens at the bottom of the septic tank?
ANAEROBIC DECOMPOSITION
What bacteria causes decomposition of organic matter from human waste, they thrive naturally in sewage?
Aerobic bacteria
Anaerobic bacteria
Facultative bacteria
What bacteria within the septic tank functions in the presence of material oxygen?
AEROBIC BACTERIA
What bacteria within the septic tank functions in the absence of free oxygen?
ANAEROBIC BACTERIA
What bacteria within the septic tank functions with or without free oxygen?
FACULTATIVE BACTERIA
The process of decomposition is regarded as _________
stabilization
Refers to the decomposition caused by anaerobic bacteriaaccompanied by bad odors
PUTREFACTION
Refers to the sewage that turns dark and smell unpleasantly due to anaerobic decomposition
SEPTIC
What type of decomposition within the septic tank is NOT accompanied by unpleasant odor and can be accomplished with no definite time and could be within a matter of hours?
AEROBIC DECOMPOSITION
What type of decomposition within the septic tank is accompanied by bad odors?
ANAEROBIC DECOMPOSITION
Refers to the lighter organic materials that rises to the surface of water within the septic tank
SCUM
What are the natural laws of nature that determines the effectiveness of plumbing installation?
Gravity
Atmospheric pressure
Term meaning to flash or washout, to remove dirt or grease by flowing through. Also refers to self-cleaning ability
SCOURING
This is sometimes referred to as the collection line of a plumbing system
HOUSE DRAIN
Type of house drain that receives discharges of sanitary waste as well as storm water, already face out and no longer permitted
COMBINED DRAIN
Type of house drain which receives discharges of sanitary and domestic waste only
SANITARY DRAIN
Type of house drain that receives discharges from industrial equipment that contains some objectionable acid wastes
INDUSTRIAL DRAIN
Type of house drain that conveys all storm clear water or surface wastewater except sanitary wastes.
STORM DRAIN
A device installed in the house drain immediately inside the foundation wall of the building. It serves as a barrier and prevents the gases coming from public sewer or septic tank and circulating through the plumbing system
HOUSE TRAP
What are the different gases produced inside the septic tank?
CH⁴
CO²
CO
H²
H²S
SO²
Gas produced inside the septic tank which is a combination of hydrogen and carbon, a principal component of natural gas
CH⁴
Gas produced inside the septic tank which is a combination of carbon and oxygen, simplest oxide of carbon
CO²
Gas produced within the septic tank which is a byproduct of methane classified as poisonous gas
CO
Gas produced within the septic tank which evolves as a moist gas from organic waste
H²
Gas produced within the septic tank which is a colorless gas with offensive odor
H²S
Gas produced within the septic tank which is a colorless gas having an irritating odor
SO²
