Schmutzdecke refers to,a)A pathogenic bacteriab)A valve in water distribution systemc)A thin layer of organic matter on the sand surface in slow sand filtersd)A method of predicting water demandCorrect answer is option 'C'. Can you explain this answer?

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Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Schmutzdecke refers to,a)A pathogenic bacteri...

'Schmutzdecke' refers to,

a)
A pathogenic bacteria
b)
A valve in water distribution system
c)
A thin layer of organic matter on the sand surface in slow sand filters
d)
A method of predicting water demand

Correct answer is option 'C'. Can you explain this answer?

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Schmutzdecke refers to,a)A pathogenic bacteriab)A valve in water distr...

Schmutzdecke- In slow sand filters, water is purified mainly by mechanical and physical-chemical processes during the first few days. Accumulation of sediment and organic matter forms a thin layer on the sand surface. This layer is referred to as "Schmutzdecke". It is living quarters of vast numbers of micro-organisms which break down organic material retained from the water, converting it into water, carbon dioxide and other oxides.

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Schmutzdecke refers to,a)A pathogenic bacteriab)A valve in water distribution systemc)A thin layer of organic matter on the sand surface in slow sand filtersd)A method of predicting water demandCorrect answer is option 'C'. Can you explain this answer?

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