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Questions and Answers
What is the primary function of aerobic bacteria in a septic tank?
What is the primary function of aerobic bacteria in a septic tank?
Which of the following describes scum in a septic tank?
Which of the following describes scum in a septic tank?
What is the minimum depth requirement for a typical septic tank according to the Revised National Plumbing Code of the Philippines?
What is the minimum depth requirement for a typical septic tank according to the Revised National Plumbing Code of the Philippines?
What is the role of effluent in a septic tank?
What is the role of effluent in a septic tank?
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Which of the following components is primarily responsible for the settling process in a septic tank?
Which of the following components is primarily responsible for the settling process in a septic tank?
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What is the maximum allowable capacity of the second compartment in a septic tank in relation to the total capacity of the tank?
What is the maximum allowable capacity of the second compartment in a septic tank in relation to the total capacity of the tank?
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For septic tanks with a capacity over 6m3, what is the minimum length required for the secondary compartment?
For septic tanks with a capacity over 6m3, what is the minimum length required for the secondary compartment?
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What is the minimum diameter required for the partition fitting in the inlet compartment of a septic tank?
What is the minimum diameter required for the partition fitting in the inlet compartment of a septic tank?
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What is the minimum slope required at the bottom of the digestion chamber in septic tanks?
What is the minimum slope required at the bottom of the digestion chamber in septic tanks?
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What is the minimum load capacity that the structure of a septic tank must support?
What is the minimum load capacity that the structure of a septic tank must support?
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Which factor does NOT determine the capacity of a septic tank?
Which factor does NOT determine the capacity of a septic tank?
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What is the minimum diameter for the vertical legs of the inlet and outlet pipes in a septic tank?
What is the minimum diameter for the vertical legs of the inlet and outlet pipes in a septic tank?
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What is the minimum distance a septic tank must be located from a water supply well?
What is the minimum distance a septic tank must be located from a water supply well?
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How far above the water surface must the inlet and outlet pipes extend?
How far above the water surface must the inlet and outlet pipes extend?
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What is the minimum distance the invert of the inlet pipe must be above the invert of the outlet pipe?
What is the minimum distance the invert of the inlet pipe must be above the invert of the outlet pipe?
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Where should a septic tank NOT be located?
Where should a septic tank NOT be located?
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What is a prohibited material for constructing baffles in a septic tank?
What is a prohibited material for constructing baffles in a septic tank?
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What is the minimum extension above liquid depth required for the side walls of a septic tank?
What is the minimum extension above liquid depth required for the side walls of a septic tank?
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Which of the following factors is important when determining the capacity of a septic tank?
Which of the following factors is important when determining the capacity of a septic tank?
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How far above the back vent openings must the cover of a septic tank be positioned?
How far above the back vent openings must the cover of a septic tank be positioned?
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Why is an inverted fitting necessary in the septic tank's inlet compartment?
Why is an inverted fitting necessary in the septic tank's inlet compartment?
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Study Notes
Sewage Disposal System: Septic Tank
- Septic tank is a container that receives and partially treats sewage.
- Sludge is the heavier organic matter that settles at the bottom of the tank.
- Scum is the lighter organic matter that floats on the surface of the septic tank.
- Effluent is the liquid sewage found between the scum and sludge.
- Anaerobic bacteria inside the septic tank decompose organic waste in the absence of oxygen.
- Aerobic bacteria inside the septic tank decompose organic waste with the presence of oxygen.
- Septic tank design criteria dictates minimum dimensions, partition structure, capacity, location, second compartment, inlet/outlet pipe size, inlet/outlet pipe length and location, and air space.
- Minimum dimensions according to the Revised National Plumbing Code of the Philippines: length 1500mm, width 900mm, depth 1200mm.
- Partition is fitted at the inlet compartment with a minimum inside diameter of 104.6mm
- Structure must be able to handle 14.4kPa of earth pressure.
- Capacity depends on the number of bedrooms, apartment units, estimated sewage flow rate, or the number of plumbing fixtures, whichever is greater.
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Location of the septic tank:
- Not underneath the house
- Minimum 1.5 meters from the building
- Minimum 1.5 meters from the property line
- Minimum 15.2 meters away from water wells or streams.
- Second compartment maximum total capacity of the tank is one-third; minimum 1 m3.
- Inlet/outlet pipe size must be no less than the sewer pipe diameter.
- Inlet/outlet pipe length must extend 101.6mm above the water surface and at least 304.8mm below it.
- Inlet/outlet pipe location inlet pipe invert level is at least 50.8mm above the outlet pipe invert.
- Air Space requires side walls extending 228.6mm above liquid depth, and tank cover extending at least 50.8mm above back vent openings.
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Description
This quiz explores the fundamentals of septic tanks, including their structure, the processes involved in sewage treatment, and the role of different types of bacteria. It also outlines the design criteria and dimensions specified in the Revised National Plumbing Code of the Philippines. Test your knowledge on these essential aspects of sewage disposal!
