In a slow sand filter, the biological layer that contributes significantly to purification is called:
Correct answer: A. Schmutzdecke
- A. Schmutzdecke
- B. Sludge blanket
- C. Filter ripening bed
- D. Oxidation ditch
Explanation
The schmutzdecke is a biologically active layer formed on the surface of a slow sand filter. It helps remove pathogens, organic matter and fine particles, whereas a sludge blanket is associated with other treatment units.
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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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