Civil Engineering - Waste Water Engineering - Discussion

34. 

In a trickling filter

[A]. filtration process is used
[B]. biological action is used
[C]. neither (a) nor (b)
[D]. both (a) and (b).

Answer: Option B

Explanation:

No answer description available for this question.

Harjeet said: (Jun 15, 2016)  
The Answer is wrong. As Per Govt of India Manual, a number of books and International Source Book issued by United Nation of Environmental Programme, filtration also occurs in Trickling filter.

So the correct answer is D (Both).

Satyam Shukla said: (Jul 20, 2017)  
I think Option D is correct.

Orai said: (Jun 6, 2018)  
Option D is correct.

Karan Singh said: (Jan 9, 2020)  
D is the correct answer. I too agree.

Anirban Roy said: (Aug 3, 2020)  
I also agree it should be D as:

The process of filtration can be explained by certain theories as:

I) Mechanical straining÷ big suspended or dissolved particles get arrested in voids.

II) Flocculation and Sedimentation÷ voids act like tiny sedimentation tanks arrest the colloidal matter which forms a gel and arrest finer particles.

III) Biological metabolism ÷ microorganisms in the voids digest the bacteria as food
IV) Electrolytic changes ÷ filtration by the method of ion exchange.
So, both come true.

Abdul Noblen said: (Nov 24, 2021)  
B is correct.

According to Spellman, The trickling filter does not provide any actual filtration. The filter media provides a large amount of surface area that the microorganisms can cling to and grow in a slime that forms on the media as they feed on the organic material in the wastewater.

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