The Question is from neet-zoology microbes-in-human-welfare , and it was created by the author T HARITHA

Question

Which of the following is put into Anaerobic sludge digester for further sewage treatment?

T HARITHA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Sewage treatment process and the role of anaerobic digestion.
	**Related Topics**: Primary treatment, secondary treatment, activated sludge process, anaerobic sludge digester.
	**Prerequisites**: Basic knowledge of sewage treatment steps and their purposes.
## SOLUTION PATHWAY
**Given Information**:
	* The question asks what is fed into an anaerobic sludge digester.
**Method & Steps**:
	1.	Understand the purpose of an anaerobic digester: It's used to decompose organic matter in sludge, reducing its volume and producing biogas.
		Reasoning: Anaerobic digestion is a biological process that breaks down sludge in the absence of oxygen.
	2.	Recall the stages of sewage treatment: Primary treatment removes solids, secondary treatment uses biological processes (like activated sludge) to remove dissolved organic matter, and tertiary treatment further purifies the water.
		Reasoning: Each stage has different outputs, some of which are further treated.
	3.	Identify the source of sludge for anaerobic digestion: Activated sludge, which is a byproduct of secondary treatment, is rich in organic matter and is typically sent to an anaerobic digester.
		Key Point: Primary sludge is also often sent to digesters, but the question focuses on the specific input.
	4.	Determine the correct answer: Activated sludge is the material that goes into anaerobic sludge digester.
		Result: The correct answer is D, Activated sludge.
 ## OPTION ANALYSIS
[A] :x: Primary sludge is also often digested, but it is not the specific input focused on in this question. 
[B] :x: Floating debris is removed in primary treatment, not used in anaerobic digestion.
[C] :x: Effluents of primary treatment are the liquid output of the primary treatment process and are used in the secondary treatment, not anaerobic digester.
[D] ✓: Activated sludge is the biological material generated in secondary treatment which is then sent for digestion. 
 ## LEARNING AIDS
	**Common Mistakes**:
		1.[Error 1]: Confusing primary sludge with activated sludge. [How to avoid]: Understand that primary sludge comes directly from settling, while activated sludge is a biological mass from secondary treatment.
		2.[Error 2]: Thinking all waste goes to the digester. [How to avoid]: Remember that only sludge (solids) from different stages are typically sent to the digester.
	**Quick Tips**:
		1.[Helpful shortcut]: Focus on the term 'activated sludge' as the key byproduct of biological treatment that is sent for digestion.
		2.[Memory aid]: Think of the order: Primary treatment -> Secondary treatment (Activated sludge) -> Anaerobic digestion.

T HARITHA · Answer

Primary sludge

T HARITHA · Answer

Floating debris

T HARITHA · Answer

Effluents of primary treatment

T HARITHA · Answer

The correct Option is "Activated sludge"

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