Before discharging the foul sewage into rivers, it is generally treated by (a) screening (b) sedimentation (c) Oxidation (d) sludge digestion and disinfection (e) all the above*

Before discharging the foul sewage into rivers, it is generally treated by
(a) screening
(b) sedimentation
(c) Oxidation
(d) sludge digestion and disinfection
(e) all the above*
by

1 Answer

Answer :

e) all the above*
by

Related questions

Before discharging the foul sewage into rivers, it is generally treated by A. Screening B. Sedimentation C. Oxidation D. All the above

Description : Before discharging the foul sewage into rivers, it is generally treated by A. Screening B. Sedimentation C. Oxidation D. All the above

Last Answer : ANS: D

Pick up the correct statement from the following: A. Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers B. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river C. Solubility of oxygen in sewage is 95% of that of distilled water D. All the above

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Last Answer : ANS: D

For treating the sewage of a large city, you will recommend A. A sedimentation tank and an activated sludge treatment plant B. A plant consisting of Imhoff tanks with low rate trickling filters C. Sedimentation tanks with high rate trickling filters D. None of these

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Last Answer : ANS: A

The sewage treatment units in which anaerobic decomposition of organic matter is used, are called A. Imhoff tanks B. Trickling filters C. Sludge sedimentation tanks D. None of these

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During sewage treatment, effluent from which one of the following treatment units has minimum wt/vol amount of suspended solids? (a) Detritus channel (b) Primary sedimentation tank (c) Secondary sedimentation tank (d) Activated sludge process aeration tank

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Sludge banks are formed if sewage is disposed of in A. Rivers B. Seas C. Lakes D. None of these

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Pick up the incorrect statement from the following: A. Septic tanks are horizontal continuous flow type of sedimentation tanks B. Septic tanks are generally provided a detention period of 12 to 36 hours C. Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases D. None of these

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During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank. (A) Filtration (B) Digestion (C) Sedimentation (D) Both (B) and (C)

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. Disinfection of water is done to remove (A) Color (B) Bad taste (C) Foul odour (D) Bacteria

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In water treatment, alum [Al2 (SO4 )3 ] is used for the process of (A) Filtration (B) Coagulation (C) Sedimentation (D) Disinfection

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__________ is the process of killing organism in water. (A) Coagulation (B) Sterilisation (C) Disinfection (D) Sedimentation

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Drinking (potable) water treatment does not involve(A) Coagulation(B) Sedimentation(C) Softening(D) Disinfection

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Very fine suspended and colloidal impurities are removed from water by a process called (A) Sedimentation (B) Coagulation (C) Disinfection (D) Softening

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Rapid sand filter (A) Should be preceded by coagulation and sedimentation (B) Uses rapid sand as filter media(C) Is used after slow sand filtering has been done (D) Can combine disinfection also

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Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called (A) Classification (B) Sedimentation (C) Clarification (D) Decantation

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What is speed restriction on deep screening site done by BCM and tamped by machine followed with DGS? (a) 20 (b) 30 (c) 40* (d) 10

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Deep screening of entire track must be done at least:- (a) Once in a quarter. (b) Once in a year. (c) Once in 5 years. (d) Once in 10 years.*

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A shallow pond in which the sewage is retained and biologically treated is called (A) Oxidation (B) Imhoff tank (C) Lagoon (D) Skimming tank

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To remove very fine suspended particles from water, the method adopted is (A) Screening (B) Sedimentation (C) Boiling (D) Filtration

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The process of passing water through beds of granular materials, is called (A) Screening (B) Sedimentation (C) Filtration (D) None of these

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Irradiation of water by ultraviolet light of suitable wavelength iscommonly used for disinfection of water in (A) Food industry (B) Municipal sewage treatment (C) Petroleum refinery (D) Iron & steel plant

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If the pH value of sewage is (a) it is acidic (b) it is alkaline (c) it is neutral* (e) None of these

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Which of the following is put into anaerobic sludge digester for further sewage treatment? (a) Primary sludge (b) Floating debris (c) Effluents of primary treatment (d) Activated sludge

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Consider the following statements : Activated sludge process can be said to comprise : 1. Conversion of dissolved organic matter into biological flocs 2. Removal of dissolved BOD of the waste water 3. Digestion of the sludge Which of these statements are correct ? (a) 1, 2 and 3 (b) 1 and 2 only (c) 2 and 3 only (d) 1 and 3 only

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Which of the following is not a practical method of low level radioactive waste disposal? (A) Dilution with inert material (B) Discharging to atmosphere through tall stacks after dilution (C) Disposing off in rivers & oceans (D) Filling in steel crates and shooting it off out of earth's gravity

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Last Answer : (D) Filling in steel crates and shooting it off out of earth's gravity

Biochemical Oxygen Demand (BOD) of sewage is the (a) Oxygen required to oxidise (b) Oxygen required to oxidise biologically inactive organic matter* (c) a and b both (d) none of these

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Indicate which of the statement is incorrect (a) The detritus tank is type of a grit chamber (b) In detritus tank, velocity of flow is further reduced (c) Grit chambers are provided in the sewage treatment process to remove the heavier inorganic matter as grit, sand etc. from the sewage (d) None of them*

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Last Answer : (d) None of them*

Sewage sludge is used as Tipping is a technique of

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______ is a by product of sewage treatment and can be decomposed to produce biogas. (1) Sewage (2) Sludge (3) Sewer (4) Scum

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The detention time (t) of a settling tank, may be defined as the time required for A. A particle to travel along its length B. A particle to travel from top surface to bottom sludge zone C. The flow of sewage to fill the tank D. None of these

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Select the correct statement from the following. (a) Biogas is produced by the activity of aerobic bacteria on animal waste. (b) Methanobacterium is an aerobic bacterium found in rumen of cattle. (c) Biogas, commonly called gobar gas, is pure methane. (d) Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria.

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Last Answer : (d) Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria.

Which of the following in sewage treatment removes suspended solids?(a) Secondary treatment (b) Primary treatment (c) Sludge treatment (d) Tertiary treatment

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Sewage sludge is an example of the __________ fluid. (A) Bingham plastic (B) Newtonian (C) Pseudo plastic (D) Dilatent

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Sewage sludge is __________ type of non-Newtonian fluid. (A) Dilatant (B) Bingham plastic (C) Pseudo plastic (D) None of these

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Last Answer : (B) Bingham plastic

An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonian fluid beyond yield stress. Which of the following is an ideal plastic? (A) Sewage sludge (B) Rubber latex (C) Blood (D) Sugar solution

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Last Answer : (A) Sewage sludge

Which of the following is a Newtonian fluid? (A) Rubber latex (B) Sewage sludge (C) Quicksand (D) Non-colloidal solution

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Which of the following is the most common pump for pumping either raw sewage or sludge? (A) Electromagnetic pump (B) Centrifugal pump (C) Reciprocating pump(D) Gear pump

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The main type of sludge gas evolved during sewage treatment in Imhoff tank is (A) CO2 (B) CH4 (C) CO (D) H2

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Use of chlorine in the treatment of sewage (A) Helps in grease separation (B) Increases the biological oxygen demand (BOD) (C) Causes bulking of activated sludge (D) Aids in flocculation

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Last Answer : (A) Helps in grease separation

Which of the following in sewage treatment removes suspended solids ? (1) Secondary treatment (2) Primary treatment (3) Sludge treatment (4) Tertiary treatment

Description : Which of the following in sewage treatment removes suspended solids ? (1) Secondary treatment (2) Primary treatment (3) Sludge treatment (4) Tertiary treatment

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_________ is a by product of sewage treatment and can be decomposed to produce biogas (1) Sewage (2) Sludge (3) Sewer (4) Scum

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Pick up the incorrect statement from the following: A. The mixture of water and waste products, is called sewage B. The treated sewage effluents, are generally used for irrigating the crops C. The process of collecting, treating and disposing off the sewage, is called sewerage D. The old convergence system was definitely better than water carried sewerage system

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Last Answer : ANS: D

Q No: 251 In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is A. [(100 + P1)/(100 – P2)] V1 B. [(100 – P1)/(100 + P2)] V1 C. [(100 – P1)/(100 – P2)] V1 D. [(100 + P2)/(100 – P1)] V1

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Last Answer : ANS: C

The first stage of neutral process of sludge digestion, is A. Acid fermentation B. Acid regression C. Alkaline fermentation D. None of these

Description : The first stage of neutral process of sludge digestion, is A. Acid fermentation B. Acid regression C. Alkaline fermentation D. None of these

Last Answer : ANS: A

In normal conditions, the period for sludge digestion, is A. 10 days B. 20 days C. 30 days D. 60 days

Description : In normal conditions, the period for sludge digestion, is A. 10 days B. 20 days C. 30 days D. 60 days

Last Answer : ANS: C

The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is A. 25 % B. 50 % C. 10 % D. 5 %

Description : The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is A. 25 % B. 50 % C. 10 % D. 5 %

Last Answer : ANS: B

Pick up the correct statement from the following: A. Rate of digestion of sludge is more at higher temperature B. Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C C. Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C D. All the above

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Last Answer : ANS: D

Pick up the incorrect statement from the following: A. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion B. Sludge digestion is carried out in sludge tank C. The gases produced in sludge digestion process, contain 75% carbon dioxide D. The gases produced in sludge digestion process, contain 75% methane

Description : Pick up the incorrect statement from the following: A. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion B. Sludge digestion is carried ... contain 75% carbon dioxide D. The gases produced in sludge digestion process, contain 75% methane

Last Answer : ANS: C

11. Acid regression stage of sludge digestion at a temperature 21°C extends over a period of A. 15 days B. 30 days C. 60 days D. 90 days

Description : 11. Acid regression stage of sludge digestion at a temperature 21°C extends over a period of A. 15 days B. 30 days C. 60 days D. 90 days

Last Answer : ANS: D

The principal gas evolved from sludge digestion tank is (A) CO(B) CO2 (C) CH4 (D) N2

Description : The principal gas evolved from sludge digestion tank is (A) CO (B) CO2 (C) CH4 (D) N2

Last Answer : (C) CH4