P. Trickling filter consists of a bed of crushed stone, gravel or slag of relatively large size. Q. As sewage passes through the filtering media of the trickling filter, an organic film is formed around the particles of filtering media. Identify the correct option.
Both are correct
Trickling Filter Media Characteristics
A trickling filter is a vital component in the secondary stage of wastewater treatment. Statement P correctly identifies that the filter consists of a bed constructed from materials like crushed stone, gravel, or slag. These materials are intentionally chosen for their relatively large size and significant surface area. This structure is crucial for efficient treatment, allowing wastewater to trickle down through the media while facilitating aeration, which supports the growth of the treatment microorganisms.
Biological Film Formation in Trickling Filters
Statement Q accurately describes the biological process occurring within a trickling filter. As the wastewater flows over the surfaces of the filter media (stone, gravel, etc.), a living layer of microorganisms, often referred to as a biological film or slime layer, develops and attaches to the media particles. This film contains a diverse community of bacteria, fungi, protozoa, and other microbes. These organisms metabolize the organic pollutants present in the sewage as the wastewater passes over them, effectively purifying the water. The formation and activity of this biological film are central to the trickling filter's function.
Conclusion on Statements P and Q
Both statement P, concerning the composition and size of the trickling filter media, and statement Q, regarding the formation of a biological film during operation, are factually correct descriptions of how trickling filters work in wastewater treatment.
Important Questions from Sewage Treatment
Consider the following statements in respect of anaerobic sludge digester:
1. It is less expensive compared to several other methods available.
2. Processing of separable solids impacts the environment to a minimum.
3. Quantity of separated solids requiring disposal is minimal
4. Digested sludge is very readily dewatered able.
Which of the above statements are correct?Chlorine is sometimes used in sewage treatment:
The activated sludge process is an
Consider the following statements regarding contact stabilization process:
1. Primary settling tank is not required in some cases.
2. BOD removal occurs in two stages.
3. Aeration volume requirements are approximately 50% of those of a conventional – or tapered – aeration plant.
4. Returned sludge is aerated for 30 min to 90 min in sludge aeration tank.
Which of the above statements are correct?- A trickling filter is designed to remove ______
