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GATE (CE) 2022: RCC #13
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Question 1
If B .O.D . of waste water sample after 5 days incubation at 20° C is 200 mg/l, deoxygenation rate constant at 20° C is 0.1 per day, ultimate B .O.D . will be
Question 2
Which of the following statement is correct in relation to activated sludge process in general
Question 3
A township is to treat 735000 litres of sewage per day which has a 5 day BOD of 185 mg/litre. An oxidation pond is used for the purpose. The effluent can have a BOD of 25 mg/litre. The loading is to be 65 kg of 5 day BOD per hectare per day. The required area (in ha.) of the pond is
Question 4
A high rate trickling filter is used for treating wastewater of a town having population of 40000 persons.
Domestic sewage = 150 lpcd having 200 mg/l of BOD
Industrial sewage = 0.25 mlD having 600 mg/l of BOD
BOD removal in primary Clarifier = 35%
Permissible BOD loading = 8000 kg/hec m/day( including recirculated sewage)
Take recirculation ratio = 1
Use formula for efficiency = (100)/(1 + 0.44(√(W/V*F)))
V is volume, F is recirculation factor and W is BOD applied to filter
Find the strength of effluent (mg/l)
Domestic sewage = 150 lpcd having 200 mg/l of BOD
Industrial sewage = 0.25 mlD having 600 mg/l of BOD
BOD removal in primary Clarifier = 35%
Permissible BOD loading = 8000 kg/hec m/day( including recirculated sewage)
Take recirculation ratio = 1
Use formula for efficiency = (100)/(1 + 0.44(√(W/V*F)))
V is volume, F is recirculation factor and W is BOD applied to filter
Find the strength of effluent (mg/l)
Question 5
At a water treatment plant, 16 million litres of water is treated daily using ferrous sulphate and lime. If the dosage of ferrous sulphate is 12 mg per litre, the total quantity of quick lime (in kg) required daily, will be
Question 6
A water sample has following properties with respect to the particle distribution:-
Total suspended solids = 1000 gms.
Overflow rate of tank = 30.24 m/day
Size (mm) 0.2 0.3 0.4 0.5
% by weight 15 25 40 20
Setting 0.25 0.30 0.35 0.40
velocity(mm/sec)
When the above sample is subjected to sedimentation in a designated tank, the total weight of the suspended solids available in the subsequent filtration process is.
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May 20ESE & GATE CE
