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Environmental Issues
Question
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During waste water treatment, trickling filter  is used for

  • primary treatment

  • secondary aerobic treatment

  • secondary anaerobic treatment

  • tertiary treatment

Answer

B.

secondary aerobic treatment

Trickling filter is a fixed-bed biological reactor that operates under (mostly) aerobic conditions. It is used for secondary aerobic treatment. In this system,  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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