A trickling filter treats wastewater mainly by using:
Correct answer: D. Microorganisms growing on a fixed medium
- A. Pressure membranes rejecting salts
- B. Chlorine reacting with dissolved solids
- C. Screens removing floating debris
- D. Microorganisms growing on a fixed medium
Explanation
A trickling filter is an attached-growth biological process in which microorganisms form a biofilm on stones or synthetic media. The wastewater passes over the media, allowing the biofilm to degrade organic matter.
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About Environmental Engineering
Environmental engineering examines water supply, water quality, treatment processes, wastewater collection and treatment, solid waste management, air pollution and public health protection. It covers sedimentation, coagulation, filtration, disinfection, biological treatment and disposal methods, while distinguishing drinking-water treatment from sewage treatment and BOD from COD.
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