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What is a primary function of a trickling filter in wastewater treatment?

  1. Enhance sedimentation

  2. Promote biological treatment

  3. Reduce sludge volume

  4. Increase effluent flow

The correct answer is: Promote biological treatment

A trickling filter plays a crucial role in the biological treatment of wastewater. The primary function of a trickling filter is to promote the growth of microorganisms on a media surface, effectively allowing these organisms to biofilm on stones, plastic media, or other materials with a large surface area. As wastewater passes over this media, the microorganisms feed on the organic matter present in the wastewater, breaking it down biologically. This biological treatment process is essential for reducing the concentration of contaminants in the wastewater before it moves on to subsequent treatment stages. The trickling filter enhances overall treatment efficiency, leading to a more effective reduction of biochemical oxygen demand (BOD) and other organic pollutants. Thus, the focus on promoting biological treatment highlights the vital role that trickling filters play in achieving cleaner effluent and meeting regulatory standards for wastewater discharge.