Question

During waste water treatment, trickling filter is used for

• A. Primary treatment
• B. Secondary aerobic treatment
• C. Secondary anaerobic treatment
• D. Tertiary treatment

Answer 1

The correct option is B Secondary aerobic treatment

During waste water treatment, trickling filter is used for secondary aerobic treatment. Here, pre-settled wastewater is continuously ‘trickled’ or showered over the filter. As the water drifted over the pores of the filter, organics are aerobically vulgarized by the biofilm covering the filter material. Trickling filters are conventionally used techniques for aerobic biological wastewater treatment units, such as active sludge systems or rotating biological contactors. Trickling filters are a secondary treatment after a primary setting process

So, the correct answer is 'Secondary aerobic treatment'