3.1 Answer the following questions with regard to the drainage structure in FIGURE 3.1 - NSC Civil Technology Woodworking - Question 3 - 2017 - Paper 1
Question 3
3.1 Answer the following questions with regard to the drainage structure in FIGURE 3.1.
3.1.1 What is the structure called?
3.1.2 Briefly describe how the organic... show full transcript
Worked Solution & Example Answer:3.1 Answer the following questions with regard to the drainage structure in FIGURE 3.1 - NSC Civil Technology Woodworking - Question 3 - 2017 - Paper 1
Step 1
What is the structure called?
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Answer
The structure depicted in Figure 3.1 is called a septic tank. It is designed to treat wastewater through the process of decomposition and separation.
Step 2
Briefly describe how the organic matter decomposes in the structure.
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Answer
Organic matter in the septic tank is decomposed by anaerobic bacteria. These microorganisms break down the waste, liquefying it and converting it into simpler substances. This process also involves other biological life such as worms and micro-organisms that contribute to the decomposition.
Step 3
What is the purpose of the inlet pipe opening at 3.1.B?
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Answer
The inlet pipe opening at 3.1.B serves as the entry point for wastewater into the septic tank. It directs the incoming flow of sewage into the tank, allowing for its treatment and sedimentation.
Step 4
Briefly motivate why the inflow at 3.1.B must be lower than the liquid level.
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Answer
The inflow at 3.1.B must be lower than the liquid level to prevent backflow and flooding of the inlet. This design ensures that the wastewater can be effectively treated and allows the septic tank to maintain proper operational pressure and function.
Step 5
To which structure is the effluent at 3.1.D discharged?
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Answer
The effluent at 3.1.D is discharged into a drainage field or leach field where it can be further treated naturally by soil filtration and absorption, preventing contamination of groundwater.
