Compared with activated sludge, trickling filters are not easily upset by shock loads, perform consistently, and are capable of taking considerable abuse. True/False?

Compared with activated sludge, trickling filters are not easily upset by shock loads, perform consistently, and are capable of taking considerable abuse. True/False?

• A. Sometimes
• B. False
• C. Not applicable
• D. True

Answer: (D)

Trickling filters use a fixed biofilm on media, so the microorganisms aren’t simply washed away when influent conditions spike. That attached-growth setup provides a buffering effect: as flow or organic load increases, the biofilm already present on the media continues to treat wastewater, and the large surface area helps spread the shock across many sites. The result is more stable treatment and less risk of immediate upset, even under surges in demand or strength of the influent. Activated sludge, on the other hand, depends on suspended microbial communities that can be disrupted by sudden changes, leading to upset, poorer settleability, or fluctuating effluent quality. Because of this robustness, trickling filters typically perform more consistently and can tolerate abusive conditions better than activated sludge systems.

Trickling filters use a fixed biofilm on media, so the microorganisms aren’t simply washed away when influent conditions spike. That attached-growth setup provides a buffering effect: as flow or organic load increases, the biofilm already present on the media continues to treat wastewater, and the large surface area helps spread the shock across many sites. The result is more stable treatment and less risk of immediate upset, even under surges in demand or strength of the influent. Activated sludge, on the other hand, depends on suspended microbial communities that can be disrupted by sudden changes, leading to upset, poorer settleability, or fluctuating effluent quality. Because of this robustness, trickling filters typically perform more consistently and can tolerate abusive conditions better than activated sludge systems.