A) primary treatment
B) secondary aerobic treatment
C) secondary anaerobic treatment
D) tertiary treatment
Correct Answer: B
Solution :During wastewater treatment, trickling filter is used for secondary aerobic treatment. Trickling filter is a fixed-bed biological reactor that operates under (mostly) aerobic conditions. Trickling filters are a secondary treatment after a primary treatment. In which pre-settled wastewater is continuously trickled or sprayed over the filter. As the water migrates through the pores of the filter, organics are aerobically degraded by the biofilm covering the filter material.
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