GATE CE Sewage PYQs & Answers

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Questions 1–2 of 2. Imported answers require independent review unless marked reviewed.

Topic practice 2 questionsPage 1 of 1

A sewage treatment plant receives sewage at a flow rate of 500 m

/day. The total suspended solids (TSS) concentration in the sewage at the inlet of primary clarifier is 200 mg/L. After the primary treatment, the TSS concentration in sewage is reduced by 60 %. The sludge from the primary clarifier contains 2 % solids concentration. Subsequently, the sludge is subjected to gravity thickening process to achieve a solids concentration of 6 %. Assume that the density of sludge, before and after thickening, is 1000 kg/m

The daily volume of the thickened sludge (in m

/day) will be __________. (round off to the nearest integer)

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Consider the reactor shown in the figure. The flow rate through the reactor is

. The concentrations (in

) of a compound in the influent and effluent are

and

, respectively. The compound is degraded in the reactor following the first order reaction. The mixing condition of the reactor can be varied such that the reactor becomes either a completely mixed flow reactor (CMFR) or a plug-flow reactor (PFR). The length of the reactor can be adjusted in these two mixing conditions to

and

while keeping the cross-section of the reactor constant. Assuming steady state and for

, the value of

(round off to 2 decimal places) is __________

Diagram for Civil Engineering question 42

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GATE CE Sewage PYQs

How to practice Sewage

Question 60

Question 42