The correct answer is: A. Trickling filter
A trickling filter is a type of biological wastewater treatment system that uses a bed of rocks or other media to support a biofilm of microorganisms. The wastewater is sprayed or trickled over the media, and the microorganisms in the biofilm break down the organic matter in the wastewater.
Trickling filters are a relatively simple and inexpensive type of wastewater treatment system, and they are widely used in both small and large treatment plants. They are also relatively energy-efficient, as they do not require the use of pumps or other mechanical equipment.
However, trickling filters can be susceptible to clogging and fouling, and they may require periodic cleaning or replacement of the media.
Here is a brief explanation of each option:
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