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Most answered questions in Water and Waste Water Quality and Treatment
1
votes
1
answer
1
GATE2017 CE-1: 55
The wastewater having an organic concentration of $54$ mg/l is flowing at a steady rate of $0.8 \: m^3/day$ through a detention tank of dimensions $2m \times 4 m \times 2 m$. If the contents of the tank are well mixed and the decay constant $0.1$ per day, the outlet concentration (in mg/l, up to one decimal place) is _________
The wastewater having an organic concentration of $54$ mg/l is flowing at a steady rate of $0.8 \: m^3/day$ through a detention tank of dimensions $2m \times 4 m \times 2...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 26, 2018
Water and Waste Water Quality and Treatment
gate2017-ce-1
numerical-answers
steady-rate
water-and-waste-water-quality-and-treatment
environmental-engineering
+
–
0
votes
1
answer
2
GATE2018 CE-2: 51
At a small water treatment plant which has $4$ filters, the rates of filteration and backwashing are $200 \: m^3/d/m^2$ and $1000 m^3/d/m^2$, respectively. Backwashing is done for $15$ min per day. The maturation, which ... the water being wasted during backwashing and maturation. The percentage increase in the filtered water produced (up to two decimal places) would be ______
At a small water treatment plant which has $4$ filters, the rates of filteration and backwashing are $200 \: m^3/d/m^2$ and $1000 m^3/d/m^2$, respectively. Backwashing is...
gatecse
4.0k
points
gatecse
asked
Feb 17, 2018
Water and Waste Water Quality and Treatment
gate2018-ce-2
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
water-treatment-plant
+
–
0
votes
1
answer
3
GATE2018 CE-2: 14
As per $\text{IS }10500:2012$, for drinking water in the absence of alternate source of water, the permissible limits for chloride and sulphate, in mg/L, respectively are $250$ and 200$ $1000$ and 400$ $200$ and 250$ $500$ and 1000$
As per $\text{IS }10500:2012$, for drinking water in the absence of alternate source of water, the permissible limits for chloride and sulphate, in mg/L, respectively are...
gatecse
4.0k
points
gatecse
asked
Feb 17, 2018
Water and Waste Water Quality and Treatment
gate2018-ce-2
environmental-engineering
permissible-limits
water-and-waste-water-quality-and-treatment
physical-chemical-and-biological-parameters
+
–
0
votes
1
answer
4
GATE2018 CE-1: 51
A water sample analysis data is given below, ... $CaCO_3$, up to one decimal place), for the water sample, is ____
A water sample analysis data is given below,$$\begin{array}{|c|c|} \hline \textbf{Ion} & \textbf{Concentration, mg/L} & \textbf{Atomic Weight} \\ \hline Ca^{2+} & 60 & 40...
gatecse
4.0k
points
gatecse
asked
Feb 17, 2018
Water and Waste Water Quality and Treatment
gate2018-ce-1
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
water-quality-standards
+
–
0
votes
1
answer
5
GATE2018 CE-1: 52
The ultimate BOD $(L_0)$ of a wastewater sample is estimated as $87 \%$ of COD. The COD of this wastewater is $300$ mg/L. Considering first order BOD reaction rate constant $k$ (use natural log) $= 0.23$ ... value in (in mg/L, up to one decimal place) after three days of incubation at $27^{\circ}$C for this wastewater will be _____
The ultimate BOD $(L_0)$ of a wastewater sample is estimated as $87 \%$ of COD. The COD of this wastewater is $300$ mg/L. Considering first order BOD reaction rate consta...
gatecse
4.0k
points
gatecse
asked
Feb 17, 2018
Water and Waste Water Quality and Treatment
gate2018-ce-1
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
biological-and-chemical-oxygen-demand
+
–
0
votes
1
answer
6
GATE2018 CE-1: 53
A waste activated sludge (WAS) is to be blended with green waste (GW). The carbon (C) and nitrogen (N) contents, per kg of WAS and GW, on dry basis are given in the table. ... $C: N$ ratio of $20:1$ on dey basis is ____
A waste activated sludge (WAS) is to be blended with green waste (GW). The carbon (C) and nitrogen (N) contents, per kg of WAS and GW, on dry basis are given in the table...
gatecse
4.0k
points
gatecse
asked
Feb 17, 2018
Water and Waste Water Quality and Treatment
gate2018-ce-1
numerical-answers
environmental-engineering
green-waste
water-and-waste-water-quality-and-treatment
sludge-disposal
+
–
0
votes
1
answer
7
GATE2018 CE-1: 33
A rapid sand filter comprising a number of filter beds is required to produce $99$ MLD of potable water. Consider water loss during backwashing as $5\%$, rate of filtration as 6.0 m/h and length to width ratio of filter bed as $1.35$. The width of each ... to take care of break-down, repair, and maintenance. The total number of filter beds required will be $19$ $20$ $21$ $22$
A rapid sand filter comprising a number of filter beds is required to produce $99$ MLD of potable water. Consider water loss during backwashing as $5\%$, rate of filtrati...
gatecse
4.0k
points
gatecse
asked
Feb 17, 2018
Water and Waste Water Quality and Treatment
gate2018-ce-1
environmental-engineering
water-and-waste-water-quality-and-treatment
unit-process-and-operations
+
–
1
votes
0
answers
8
Made Easy Gate Previous year Questions
If we have 3 samples Initial DO. Final DO. Volume 1. 9.2 6.9 5 2. 9.1 4.4 10 3. 8.4 0 50 Do we need to consider last sample for finding average BOD?
If we have 3 samples Initial DO. Final DO. Volume1. 9.2 6.9 52. 9.1 4.4 ...
Don6
130
points
Don6
asked
May 11, 2021
Water and Waste Water Quality and Treatment
gatecivil
water-treatment-plant
bod-rate-constant
wastewater
+
–
0
votes
0
answers
9
GATE Civil 2021 Set 2 | Question: 15
The hardness of a water sample is measured directly by titration with $\text{0.01 M}$ solution of ethylenediamine tetraacetic acid $\text{(EDTA)}$ using eriochrome black $\text{T (EBT)}$ as an indicator. The $\text{EBT}$ reacts ... colour of the solution changes from blue-green to reddish brown blue to colourless reddish brown to pinkish yellow Wine red to blue
The hardness of a water sample is measured directly by titration with $\text{0.01 M}$ solution of ethylenediamine tetraacetic acid $\text{(EDTA)}$ using eriochrome black ...
go_editor
5.3k
points
go_editor
asked
Mar 1, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set2
basics-of-water-quality-standards
physical-chemical-and-biological-parameters
hardness-of-water
+
–
0
votes
0
answers
10
GATE Civil 2021 Set 2 | Question: 51
An activated sludge process $\text{(ASP)}$ is designed for secondary treatment of $7500\:m^{3}/$day of municipal wastewater. After primary clarifier, the ultimate $\text{BOD}$ of the influent, which enters into $\text{ASP}$ ... underflow volume (in $m^{3}$/day, $\textit{round off to one decimal place}$) of sludge wastage is _______________________
An activated sludge process $\text{(ASP)}$ is designed for secondary treatment of $7500\:m^{3}/$day of municipal wastewater. After primary clarifier, the ultimate $\text{...
go_editor
5.3k
points
go_editor
asked
Mar 1, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set2
numerical-answers
sludge-disposal
activated-sludge-process
+
–
0
votes
0
answers
11
GATE Civil 2021 Set 1 | Question: 12
Which one of the following is correct? The partially treated effluent from a food processing industry, containing high concentration of biodegradable organics, is being discharged into a flowing river at a point $\text{P}$. If the rate of ... $1$ A young lake characterized by low nutrient content and low plant productivity is called $\textit{eutrophic lake}$
Which one of the following is correct?The partially treated effluent from a food processing industry, containing high concentration of biodegradable organics, is being di...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
primary-secondary-treatment
biochemical-oxygen-demand
+
–
0
votes
0
answers
12
GATE Civil 2021 Set 1 | Question: 28
A $50$ $\text{mL}$ sample of industrial wastewater is taken into a silica crucible. The empty weight of the crucible is $54.352$ $\text{g}$. The crucible with the sample is dried in a hot air oven at $104\;^{\circ}C$ till a constant weight of ... volatile solids is _____________________ $\text{15540 mg/L}$ $\text{8620 mg/L}$ $\text{6920 mg/L}$ $\text{1700 mg/L}$
A $50$ $\text{mL}$ sample of industrial wastewater is taken into a silica crucible. The empty weight of the crucible is $54.352$ $\text{g}$. The crucible with the sample ...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
primary-secondary-treatment
wastewater
+
–
0
votes
0
answers
13
GATE Civil 2021 Set 1 | Question: 33
A water sample is analyzed for coliform organisms by the multiple-tube fermentation method. The results of confirmed test are as follows: $\begin{array}{|cl|cI|cI|}\hline &\textbf{Sample size $ ... $110$ The $\text{MPN}$ of coliform organisms per $\text{100 mL}$ is $1100000$ $110000$ $1100$ $110$
A water sample is analyzed for coliform organisms by the multiple-tube fermentation method. The results of confirmed test are as follows:$\begin{array}{|cl|cI|cI|}\hline&...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
water-quality-index
fermentation-method
+
–
0
votes
0
answers
14
GATE Civil 2021 Set 1 | Question: 34
Ammonia nitrogen is present in a given wastewater sample as the ammonium ion $\text({NH}_{4}$^{+})$ and ammonia $\text({NH}_{3})$. If $ ... _{3}$ will be found in equal measures At $\text{pH}$ $7.0$, $\text{NH}_{4}$^{+}$ will be predominant
Ammonia nitrogen is present in a given wastewater sample as the ammonium ion $\text({NH}_{4}$$^{+})$ and ammonia $\text({NH}_{3})$. If $\text{pH}$ is the only deciding fa...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
chemical-biological-parameters
+
–
0
votes
0
answers
15
GATE Civil 2021 Set 1 | Question: 52
A secondary clarifier handles a total flow of $9600 \text{ m}^3\text{/d}$ from the aeration tank of a conventional activated-sludge treatment system. The concentration of solids in the flow from the aeration tank is $3000\text{ mg/L}$. ... . The surface area of the designed clarifier for thickening (in $\text{m}^2$, $\textit{in integer}$) is ___________________
A secondary clarifier handles a total flow of $9600 \text{ m}^3\text{/d}$ from the aeration tank of a conventional activated-sludge treatment system. The concentration of...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
numerical-answers
sludge-disposal
activated-sludge-treatement
+
–
0
votes
0
answers
16
GATE2020-CE-1-25
A river has a flow of $1000$ million litres per day (MLD), $BOD_5$ of $5\:mg/litre$ and Dissolved Oxygen (DO) level of $8\:mg/litre$ before receiving the wastewater discharge at a location. For the existing environmental conditions, the saturation ... complete mixing of wastewater and river water, the immediate DO deficit (in $mg/litre$ round off to two decimal places), is ______.
A river has a flow of $1000$ million litres per day (MLD), $BOD_5$ of $5\:mg/litre$ and Dissolved Oxygen (DO) level of $8\:mg/litre$ before receiving the wastewater disch...
go_editor
5.3k
points
go_editor
asked
Feb 27, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-1
numerical-answers
effluent-discharge-standards
biochemical-oxygen-demand
+
–
0
votes
0
answers
17
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 __________
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 $BOD_5\:\text{of}\:500\:mg/litre$ join...
go_editor
5.3k
points
go_editor
asked
Feb 27, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-1
water-and-waste-water
numerical-answers
wastewater-discharge
bod
+
–
0
votes
0
answers
18
GATE2020 CE-2-16
The relationship between oxygen consumption and equivalent biodegradable organic removal (i.e.,BOD) in a closed container with respect to time is shown in the figure Assume that the rate of oxygen consumption is directly proportional to the amount of degradable organic matter and is expressed as ... is $BOD_5 = L_5$ $BOD_t = L_0-L_t$ $L_0 = L_te^{-kt}$ $L_t = L_0(1-e^{-kt})$
The relationship between oxygen consumption and equivalent biodegradable organic removal (i.e.,BOD) in a closed container with respect to time is shown in the figureAssum...
go_editor
5.3k
points
go_editor
asked
Feb 13, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-2
environmental-engineering
effluent-discharge-standards
biological-oxygen-demand
+
–
0
votes
0
answers
19
GATE2020 CE-2-52
The ion product of water $(pK_w)$ is $14$. If a rain water sample has a $pH$ of $5.6$, the concentration of $OH^-$ in the sample (in $10^{-9}\: \text{mol/litre}$, round off to one decimal place), is ________.
The ion product of water $(pK_w)$ is $14$. If a rain water sample has a $pH$ of $5.6$, the concentration of $OH^-$ in the sample (in $10^{-9}\: \text{mol/litre}$, round o...
go_editor
5.3k
points
go_editor
asked
Feb 13, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-2
numerical-answers
physical-chemical-and-biological-parameters
ph-scale
+
–
0
votes
0
answers
20
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 ________.
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 $C = 12\: \text{g/mol}, ...
go_editor
5.3k
points
go_editor
asked
Feb 13, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-2
numerical-answers
water-and-waste-water
physical-chemical-and-biological-parameters
+
–
0
votes
0
answers
21
GATE2017 CE-2-10
The most important type of species involved in the degradation of organic matter in the case of activated sludge process is autotrophs heterotrophs prototrophs photo-autotrophs
The most important type of species involved in the degradation of organic matter in the case of activated sludge process isautotrophsheterotrophsprototrophsphoto-autotrop...
gatecse
4.0k
points
gatecse
asked
Aug 7, 2019
Water and Waste Water Quality and Treatment
gate2017-ce-2
water-and-waste-water-quality-and-treatment
environmental-engineering
sludge-disposal
activated-sludge-process
+
–
0
votes
0
answers
22
GATE2017 CE-2-51
For a given water sample, the ratio between BOD$_{\text{5-day, 20}^{\circ} C}$ and the ultimate BOD is $0.68$. The value of the reaction rate constant $k$ (on base $e$) (in day$^{-1}$, up to two decimal places) is ________
For a given water sample, the ratio between BOD$_{\text{5-day, 20}^{\circ} C}$ and the ultimate BOD is $0.68$. The value of the reaction rate constant $k$ (on base $e$) (...
gatecse
4.0k
points
gatecse
asked
Aug 7, 2019
Water and Waste Water Quality and Treatment
gate2017-ce-2
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
biological-oxygen-demand
+
–
0
votes
0
answers
23
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 $51 \%$ $65 \%$ $78 \%$ $100 \%$
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 ...
Arjun
13.0k
points
Arjun
asked
Feb 14, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-1
water-and-waste-water
environmental-engineering
water-treatment-plant
sedimentation
+
–
0
votes
0
answers
24
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 ________
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 $...
Arjun
13.0k
points
Arjun
asked
Feb 14, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-1
numerical-answers
water-and-waste-water
environmental-engineering
wastewater-treatment-plant
chlorination-process
+
–
0
votes
0
answers
25
GATE2019 CE-2: 10
Analysis of a water sample revealed that the sample contains the following species. $CO_3^{2-}, Na^+, H^+, PO_4^{3-}, Al^{3+}, H_2CO_3, Cl^-, Ca^{2+}, Mg^{2+}, HCO_3^-, Fe^{2+}, OH^-$ ... $CO_3^{2-}, H^+, H_2CO_3, HCO_3^-$ $CO_3^{2-}, H_2CO_3, HCO_3^-, OH^-$ $H^+, H_2CO_3, HCO_3^-, OH^-$
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...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-2
water-and-waste-water
environmental-engineering
alkalinity
+
–
0
votes
0
answers
26
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
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 ...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-2
water-and-waste-water
environmental-engineering
water-treatment-plant
+
–
0
votes
0
answers
27
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 ______
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 ...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-2
numerical-answers
water-and-waste-water
environmental-engineering
water-treatment-plant
+
–
0
votes
0
answers
28
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 ____________
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...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-2
numerical-answers
environmental-engineering
water-and-waste-water
effluent-discharge-standards
+
–
0
votes
0
answers
29
GATE2016-2-18
A water supply board is responsible for treating $1500 \:m^3/day$ of water. A settling column analysis indicates that an overflow rate of $20 \: m/day$ will produce satisfactory removal for a depth of $3.1 \: m$. It is decided to have two circular settling tanks in parallel. The required diameter (expressed in $m$) of the settling tank is __________
A water supply board is responsible for treating $1500 \:m^3/day$ of water. A settling column analysis indicates that an overflow rate of $20 \: m/day$ will produce satis...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 27, 2018
Water and Waste Water Quality and Treatment
gate2016-ce-2
numerical-answers
environmental-engineering
water-and-waste-water-quality-and-treatment
drinking-water-treatment
+
–
0
votes
0
answers
30
GATE2016-2-19
The hardness of a ground water sample was found to be $420 \: mg/L$ as $CaCO_3$. A softener containing ion exchange resins was installed to reduce the total hardness to $75 \: mg/L$ as $CaCO_3$ before supplying to $4$ households. Each household gets treated water at ... $100\%$, the bypass flow rate (expressed in $L/day$) is _________
The hardness of a ground water sample was found to be $420 \: mg/L$ as $CaCO_3$. A softener containing ion exchange resins was installed to reduce the total hardness to $...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 27, 2018
Water and Waste Water Quality and Treatment
gate2016-ce-2
numerical-answers
environmental-engineering
water-and-waste-water-quality-and-treatment
hardness-of-water
+
–
0
votes
0
answers
31
GATE2016-2-50
A sample of water has been analyzed for common ions and results are presented in the form of a bar diagram as shown. The non-carbonate hardness (expressed in mg/L as $CaCO_3$) of the sample is $40$ $165$ $195$ $205$
A sample of water has been analyzed for common ions and results are presented in the form of a bar diagram as shown.The non-carbonate hardness (expressed in mg/L as $CaCO...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 27, 2018
Water and Waste Water Quality and Treatment
gate2016-ce-2
water-and-waste-water-quality-and-treatment
environmental-engineering
basics-of-water-quality-standards
+
–
0
votes
0
answers
32
GATE2016-2-52
For a wastewater sample, the three-day biochemical oxygen demand at incubation temperature of $20^{\circ}C$ (BOD$_{\text{3day}, 20^{\circ}C}$) is estimated as $200 mg/L$ ... in mg/L) of the wastewater at incubation temperature of $20^{\circ}C$ (BOD$_{\text{5day}, 20^{\circ}C}$) would be ________
For a wastewater sample, the three-day biochemical oxygen demand at incubation temperature of $20^{\circ}C$ (BOD$_{\text{3day}, 20^{\circ}C}$) is estimated as $200 mg/L$....
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 27, 2018
Water and Waste Water Quality and Treatment
gate2016-ce-2
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
wastewater
incubation-temperature
+
–
0
votes
0
answers
33
GATE2016-1-18
Crown corrosion in a reinforced concrete sewer is caused by: $H_2S$ $CO_2$ $CH_4$ $NH_3$
Crown corrosion in a reinforced concrete sewer is caused by:$H_2S$$CO_2$$CH_4$$NH_3$
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 27, 2018
Water and Waste Water Quality and Treatment
gate2016-ce-1
water-and-waste-water
water-resources-engineering
concrete-sewer
sewerage-treatment
+
–
0
votes
0
answers
34
GATE2016-1-20
Match the items in Group - I with those in Group - II and choose the right combination. ... $P - 1; \: Q - 4; \: R - 2; \: S - 3$
Match the items in Group – I with those in Group – II and choose the right combination.$$\begin{array}{llll} {} & \underline{\text{Group – I}} & {} & \underline{\...
Milicevic3306
11.9k
points
Milicevic3306
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Mar 27, 2018
Water and Waste Water Quality and Treatment
gate2016-ce-1
water-and-waste-water-quality-and-treatment
environmental-engineering
activated-sludge-process
+
–
0
votes
0
answers
35
GATE2016-1-50
Effluent from an industry ‘A’ has a pH of $4.2$. The effluent from another industry ‘B’ has double the hydroxyl (OH) ion concentration than the effluent from industry ‘A’. pH of effluent from the industry ‘B’ will be ______
Effluent from an industry ‘A’ has a pH of $4.2$. The effluent from another industry ‘B’ has double the hydroxyl (OH) ion concentration than the effluent from indu...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 27, 2018
Water and Waste Water Quality and Treatment
gate2016-ce-1
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
effluent-discharge-standards
+
–
0
votes
0
answers
36
GATE2016-1-52
The $2$-day and $4$-day BOD values of a sewage sample are $100$ mg/L and $155$ mg/L, respectively. The value of BOD rate constant (expressed in per day) is __________
The $2$-day and $4$-day BOD values of a sewage sample are $100$ mg/L and $155$ mg/L, respectively. The value of BOD rate constant (expressed in per day) is __________
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 27, 2018
Water and Waste Water Quality and Treatment
gate2016-ce-1
numerical-answers
environmental-engineering
water-and-waste-water-quality-and-treatment
sewage
bod-rate-constant
+
–
0
votes
0
answers
37
GATE2017 CE-1: 14
The wastewater from a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the ... the location S. remains constant all along the length of the river. is lowest at a point downstream of the location S.
The wastewater from a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of a...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 26, 2018
Water and Waste Water Quality and Treatment
gate2017-ce-1
environmental-engineering
water-and-waste-water-quality-and-treatment
biodegradation
+
–
0
votes
0
answers
38
GATE2017 CE-1: 54
Two wastewater streams A and B, having an identical ultimate BOD are getting mixed to form the stream C. The temperature of the stream A is $20^{\circ}C$ and the temperature of the stream C is $10^{\circ}C$. It is given that the $5$-day BOD of the stream A measured ... The $5-$day BOD (in mg\I, up to one decimal place ) of the stream C, calculated at $10^{\circ} C$, is _________
Two wastewater streams A and B, having an identical ultimate BOD are getting mixed to form the stream C. The temperature of the stream A is $20^{\circ}C$ and the temperat...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 26, 2018
Water and Waste Water Quality and Treatment
gate2017-ce-1
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
biological-oxygen-demand
+
–
0
votes
0
answers
39
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 _________.
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...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 26, 2018
Water and Waste Water Quality and Treatment
gate2015-ce-2
numerical-answers
water-and-waste-water
environmental-engineering
water-treatment-plant
+
–
1
votes
0
answers
40
GATE2015-2-50
In a wastewater treatment plant, primary sedimentation tank (PST) designed at an overflow rate of $32.5 \: m^3/day/m^2$ is $32.5$ m long, $8.0$ m wide and liquid depth of $2.25$ m. If the length of the weir is $75$ m, the weir loading rate (in $m^3/day/m$) is ______.
In a wastewater treatment plant, primary sedimentation tank (PST) designed at an overflow rate of $32.5 \: m^3/day/m^2$ is $32.5$ m long, $8.0$ m wide and liquid depth of...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 26, 2018
Water and Waste Water Quality and Treatment
gate2015-ce-2
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
wastewater-treatment-plant
+
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