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Recent questions tagged water-and-waste-water
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1
GATE2020-CE-1-17
An amount of $35.67\:mg\:HCl$ is added to distilled water and the total solution volume is made to one litre. The atomic weights of $H$ and $Cl$ are $1$ and $35.5$, respectively. Neglecting the dissociation of water, the pH of the solution, is $3.50$ $3.01$ $2.50$ $2.01$
go_editor
asked
in
Water Resources Engineering
Feb 28, 2020
by
go_editor
5.3k
points
gate2020-ce-1
water-resources-engineering
water-and-waste-water
0
votes
0
answers
2
GATE2020-CE-1-54
A stream with a flow rate of $5\:m^3/s$ is having an ultimate BOD of $30\:mg/litre$. A wastewater discharge of $0.20\:m^3/s$ having $BOD_5\:\text{of}\:500\:mg/litre$ joins the stream at a location and instantaneously gets mixed up completely. The ... $e$). The BOD (in mg/litre, round off to two decimal places) remaining at $3\:km$ downstream from the mixing location, is __________
go_editor
asked
in
Water and Waste Water Quality and Treatment
Feb 28, 2020
by
go_editor
5.3k
points
gate2020-ce-1
water-and-waste-water
numerical-answers
wastewater-discharge
bod
0
votes
0
answers
3
GATE2020 CE-2-54
A sample of water contains an organic compound $C_8H_{16}O_8$ at a concentration of $10^{-3}\: \text{mol/litre}$. Given that the atomic weight of $C = 12\: \text{g/mol}, H = 1\: \text{g/mol}$, and $O = 16\: \text{g/mol}$, the theoretical oxygen demand of water (in $g$ of $O_2$ per litre, round off to two decimal places), is ________.
go_editor
asked
in
Water and Waste Water Quality and Treatment
Feb 13, 2020
by
go_editor
5.3k
points
gate2020-ce-2
numerical-answers
water-and-waste-water
physical-chemical-and-biological-parameters
0
votes
0
answers
4
GATE2019 CE-1: 34
Sedimentation basin in a water treatment plant is designed for a flow rate of $0.2 \: m^3/s$. The basin is rectangular with a length of $32 \: m$, width of $8 \:m $, and depth of $4 \: m$. Assume that the settling velocity of these particles is governed by ... diameter $25 \mu m$ (spherical and uniform), the removal efficiency of these particles is $51 \%$ $65 \%$ $78 \%$ $100 \%$
Arjun
asked
in
Water and Waste Water Quality and Treatment
Feb 14, 2019
by
Arjun
13.0k
points
gate2019-ce-1
water-and-waste-water
environmental-engineering
water-treatment-plant
sedimentation
0
votes
0
answers
5
GATE2019 CE-1: 42
A wastewater is to be disinfected with $35 \: mg/L$ of chlorine to obtain $99 \%$ kill of micro-organisms. The number of micro-organisms remaining alive $(N_t)$ at time $t$, is modelled by $N_t=N_o e^{-kt}$, where $N_o$ is number of micro-microorganisms at $t=0$, ... $1.0 \: m$, respectively, the length of the tank (in $m$, round off to $2$ decimal places) is ________
Arjun
asked
in
Water and Waste Water Quality and Treatment
Feb 14, 2019
by
Arjun
13.0k
points
gate2019-ce-1
numerical-answers
water-and-waste-water
environmental-engineering
wastewater-treatment-plant
chlorination-process
0
votes
0
answers
6
GATE2019 CE-2: 10
Analysis of a water sample revealed that the sample contains the following species. $CO_3^{2-}, Na^+, H^+, PO_4^{3-}, Al^{3+}, H_2CO_3, Cl^-, Ca^{2+}, Mg^{2+}, HCO_3^-, Fe^{2+}, OH^-$ ... $CO_3^{2-}, H^+, H_2CO_3, HCO_3^-$ $CO_3^{2-}, H_2CO_3, HCO_3^-, OH^-$ $H^+, H_2CO_3, HCO_3^-, OH^-$
Arjun
asked
in
Water and Waste Water Quality and Treatment
Feb 12, 2019
by
Arjun
13.0k
points
gate2019-ce-2
water-and-waste-water
environmental-engineering
alkalinity
0
votes
0
answers
7
GATE2019 CE-2: 32
Chlorine is used as the disinfectant in a municipal water treatment plant. It achieves $50$ percent of disinfection efficiency measured in terms of killing the indicator microorganisms (E-Coli) in $3$ minutes. The minimum time required to achieve $99$ percent disinfection efficiency would be $9.93$ minutes $11.93$ minutes $19.93$ minutes $21.93$ minutes
Arjun
asked
in
Water and Waste Water Quality and Treatment
Feb 12, 2019
by
Arjun
13.0k
points
gate2019-ce-2
water-and-waste-water
environmental-engineering
water-treatment-plant
0
votes
0
answers
8
GATE2019 CE-2: 40
A water treatment plant treats $6000 \: m^3$ of water per day. As a part of the treatment process, discrete particles are required to be settled in a clarifier. A column test indicates that an overflow rate of $1.5 \: m$ per hour would produce the desired removal of ... of $3.0 \:m$. The volume of the required clarifier, (in $m^3$, round off to $1$ decimal place) would be ______
Arjun
asked
in
Water and Waste Water Quality and Treatment
Feb 12, 2019
by
Arjun
13.0k
points
gate2019-ce-2
numerical-answers
water-and-waste-water
environmental-engineering
water-treatment-plant
0
votes
0
answers
9
GATE2019 CE-2: 42
Consider the reactor shown in the figure. The flow rate through the reactor is $Q \: m^3/h$. The concentrations (in $mg/L$) of a compound in the influent and effluent are $C_0$ and $C$, respectively. The compound is degraded in the reactor following the first order ... $L_{\text{CMFR}}/L_{\text{PFR}}$ (round off to $2$ decimal places) is ____________
Arjun
asked
in
Water and Waste Water Quality and Treatment
Feb 12, 2019
by
Arjun
13.0k
points
gate2019-ce-2
numerical-answers
environmental-engineering
water-and-waste-water
effluent-discharge-standards
0
votes
0
answers
10
GATE2016-1-18
Crown corrosion in a reinforced concrete sewer is caused by: $H_2S$ $CO_2$ $CH_4$ $NH_3$
Milicevic3306
asked
in
Water and Waste Water Quality and Treatment
Mar 28, 2018
by
Milicevic3306
11.9k
points
gate2016-ce-1
water-and-waste-water
water-resources-engineering
concrete-sewer
sewerage-treatment
0
votes
0
answers
11
GATE2015-2-48
A water treatment plant of capacity, $1 \: m^3/s$ has filter boxed of dimensions $6 \; m \times 10 \: m$. Loading rate to the filters is $120 \: m^3/day/m^2$. When two of the filters are out of service for back washing, the loading rate (in $m^3/day/m^2$) is _________.
Milicevic3306
asked
in
Water and Waste Water Quality and Treatment
Mar 26, 2018
by
Milicevic3306
11.9k
points
gate2015-ce-2
numerical-answers
water-and-waste-water
environmental-engineering
water-treatment-plant
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