GATE Civil Engineering

A facultative pond system is employed for wastewater treatment. Which of the following statements is/are true:

A compound has a general formula $\mathrm{C}_{\mathrm{a}} \mathrm{H}_{\mathrm{b}} \mathrm{O}_{\mathrm{c}} \mathrm{N}_{\mathrm{d}}$ and molecular weight 187. A $935 \mathrm{mg} / \m...

$\mathrm{MgCl}_2$ and $\mathrm{CaSO}_4$ salts are added to 1 litre of distilled deionized water and mixed until completely dissolved. Total Dissolved Solids (TDS) concentration is...

Identify the treatment technology/technologies NOT recommended for highly biodegradable organic solid wastes.

A community generates 1 million litres/day (MLD) of wastewater. This wastewater is treated using activated sludge process (ASP). The working volume of the aeration tank of the ASP...

A hydrocarbon $\left(\mathrm{C}_n \mathrm{H}_m\right)$ is burnt in air $\left(\mathrm{O}_2+3.78 \mathrm{~N}_2\right)$. The stoichiometric fuel to air mass ratio for this process is...

Aeration is employed as a treatment option for the removal of several pollutants from contaminated water. Identify the pollutant(s), where aeration is employed as a part of their r...

The bacteria mainly responsible for crown corrosion in a sewer is $\qquad$

A settling chamber is used for the removal of discrete particulate matter from air with following conditions. Horizontal velocity of air $=0.2 \mathrm{~m} / \mathrm{s}$; Temperatur...

Organic fraction of municipal solid waste (OFMSW) with bulk density of $315 \mathrm{~kg} / \mathrm{m}^3$ and water content of $30 \%$ is mixed with municipal sludge of bulk density...

Fecal Coliform (FC) concentration in river water was measured as 10780 cfu/100 ml. The FC concentration after the conventional water treatment, but before chlorination, was measure...

Free residual chlorine concentration in water was measured to be $2 \mathrm{mg} / \mathrm{l}$ (as $\mathrm{Cl}_2$ ). The pH of water is 8.5. By using the chemical equation given be...

The analyses results of a water sample are given below. The non-carbonate hardness of the water (in $\mathrm{mg} / \mathrm{L}$ ) as $\mathrm{CaCO}_3$ is __________ (in integer). $$...

The Surface Overflow Rate (SOR) in a rectangular sedimentation tank is $45 \mathrm{~m}^3 / \mathrm{m}^2 / \mathrm{d}$. Minimum diameters of spherical inorganic and organic particle...

What is the CORRECT match between the air pollutants and treatment techniques given in the table? Air pollutants P - NO2 Q - SO2 R - CO S - Particles Treatment techniques i - Flari...

The primary air pollutant(s) is/are

For assessing the compliance with the emissions standards of incineration plants, a correction needs to be applied to the measured concentrations of air pollutants. The emission st...

The following table gives various components of Municipal Solid Waste (MSW) and a list of treatment/separation techniques. Component of MSW Treatment/separation technique P - Ferro...

The primary air pollutant(s) is/are

For assessing the compliance with the emissions standards of incineration plants, a correction needs to be applied to the measured concentrations of air pollutants. The emission st...

Activated carbon is used to remove a pollutant from wastewater in a mixed batch reactor, which follows first-order reaction kinetics. At a reaction rate of 0.38 /day, the time (in...

A water treatment plant treats 25 MLD water with a natural alkalinity of 4.0 mg/L (as CaCO 3 ). It is estimated that, during the coagulation of this water, 450 kg/day of calcium bi...

What is the CORRECT match between the air pollutants and treatment techniques given in the table? Air pollutants Treatment techniques P - NO 2 i - Flaring Q - SO 2 ii - Cyclonic se...

Which one of the following products is NOT obtained in anaerobic decomposition of glucose?

A circular settling tank is to be designed for primary treatment of sewage at a flow rate of 10 million liters/day. Assume a detention period of 2.0 hours and surface loading rate...

An organic waste is represented as C 240 O 200 H 180 N 5 S 5 . (Atomic weights: S-32, H-1, C-12, O-16, N-14). Assume complete conversion of S to SO 2 while burning. SO 2 generated...

Which one of the following statements is TRUE for Greenhouse Gas (GHG) in the atmosphere?

Which of the following is/are NOT active disinfectant(s) in water treatment?

Match the following air pollutants with the most appropriate adverse health effects: Air pollutant (P) Aromatic hydrocarbons (Q) Carbon monoxide (R) Sulfur oxides (S) Ozone Health...

Which one of the following statements is TRUE for Greenhouse Gas (GHG) in the atmosphere?

Identify the waterborne diseases caused by viral pathogens:

Which of the following statements is/are TRUE for the Refuse-Derived Fuel (RDF) in the context of Municipal Solid Waste (MSW) management?

In the following table, identify the correct set of associations between the entries in Column - 1 and Column-2. Column-1 Column-2 P: Reverse Osmosis III: Concentration Polarizatio...

Which of the following statements is/are TRUE in relation to the Maximum Mixing Depth (or Height) ‘D max ’ in the atmosphere?

The composition and energy content of a representative solid waste sample are given in the table. If the moisture content of the waste is 26%, the energy content of the solid waste...

A flocculator tank has a volume of 2800 m 3 . The temperature of water in the tank is 15°C, and the average velocity gradient maintained in the tank is 100/s. The temperature of wa...

The wastewater inflow to an activated sludge plant is 0.5 m 3 /s, and the plant is to be operated with a food to microorganism ratio of 0.2 mg/mg-d. The concentration of influent b...

In the context of Municipal Solid Waste Management, ‘Haul’ in ‘Hauled Container System operated in conventional mode’ includes the _________.

Which of the following is/are NOT active disinfectant(s) in water treatment?

For the elevation and temperature data given in the table, the existing lapse rate in the environment is _____ ℃/100 m (round off to two decimal places). $$ \begin{array}{|c|c|} \h...

Match the following air pollutants with the most appropriate adverse health effects : Air pollutant Health effect to human and/or test animal (P) Aromatic hydrocarbons (IV) Carcino...

In the context of water and wastewater treatments, the correct statements are:

Which of the following statements is/are TRUE for the aerobic composting of sewage sludge?

The theoretical aerobic oxidation of biomass (C 5 H 7 O 2 N) is given below: C 5 H 7 O 2 N + 5O 2 → 5CO 2 + NH 3 + 2H 2 O The biochemical oxidation of biomass is assumed as a first...

The total hardness in raw water is 500 milligram per liter as CaCO 3 . The total hardness of this raw water, expressed in milligram equivalent per liter, is (Consider the atomic we...

For wastewater coming from a wood pulping industry, Chemical Oxygen Demand (COD) and 5-day Biochemical Oxygen Demand (BOD 5 ) were determined. For this wastewater, which of the fol...

Which of the following processes can be used for conversion of salt water into fresh water?

Henry's law constant for transferring O 2 from air into water, at room temperature, is 1.3 $${{mmol} \over {liter - atm}}$$. Given that the partial pressure of O 2 in the atmospher...

In a water sample, the concentrations of Ca 2+ , Mg 2+ and HCO$$_3^ - $$ are 100 mg/L, 36 mg/L and 122 mg/L, respectively. The atomic masses of various elements are : Ca = 40, Mg =...

A wastewater sample contains two nitrogen species, namely ammonia and nitrate. Consider the atomic weight of N, H, and O as 14 g/mol, 1 g/mol, and 16 g/mol, respectively. In this w...

A 2% sewage sample (in distilled water) was incubated for 3 days at 27$$^\circ$$C temperature. After incubation, a dissolved oxygen depletion of 10 mg/L was recorded. The biochemic...

A water treatment plant has a sedimentation basin of depth 3 m, width 5 m, and length 40 m. The water inflow rate is 500 m 3 /h. The removal fraction of particles having a settling...

A 100 mg of HNO 3 (strong acid) is added to water, bringing the final volume to 1.0 liter. Consider the atomic weights of H, N, and O, as 1 g/mol. 14 g mol. and 16 g/mol, respectiv...

In a city, the chemical formula of biodegradable fraction of municipal solid waste (MSW) is C 100 H 250 O 80 N. The waste has to be treated by forced-aeration composting process fo...

A sewage treatment plant receives sewage at a flow rate of 5000 m 3 /day. The total suspended solids (TSS) concentration in the sewage at the inlet of primary clarifier is 200 mg/L...

Match the following attributes of a city with the appropriate scale of measurements. Attribute Scale of measurement (P) Average temperature ($$^\circ $$C) of a city (I) Interval (Q...

To design an optimum municipal solid waste collection route, which of the following is/are NOT desired :

A sample of air analyzed at 25$$^\circ$$C and 1 atm pressure is reported to contain 0.04 ppm of SO 2 . Atomic mass of S = 32. O = 16. The equivalent SO 2 concentration (in $$\mu$$g...

A process equipment emits, 5 kg/h of volatile organic compounds (VOCs). If a hood placed over the process equipment captures 95% of the VOCs, then the fugitive emission in kg/h is

In a solid waste handling facility, the moisture contents (MC) of food waste, paper waste, and glass waste were found to be MCf, MCp, and MCg, respectively. Similarly, the energy c...

At a municipal waste handling facility, 30 metric ton mixture of food waste, yard waste, and paper waste was available. The moisture content of this mixture was found to be 10%. Th...

Which of the following statement(s) is/are correct?

Ammonia nitrogen is present in a given wastewater sample as the ammonium ion (NH4+) and ammonia (NH3). If pH is the only deciding factor for the proportion of these two constituent...

During chlorination process, aqueous (aq) chlorine reacts rapidly with water to form Cl-, HOCl, and H+ as shown below Cl₂ (aq) + H₂O ⇌ HOCl + Cl⁻ + H⁺ The most active disinfectant...

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 th...

A gaseous chemical has a concentration of 41.6 µmol/m³ in air at 1 atm pressure and temperature 293 K. The universal gas constant R is 82.05×10⁻⁶ (m³ atm)/(mol K). Assuming that id...

A stream with a flow rate of 5 m³/s is having an ultimate BOD of 30 mg/litre. A wastewater discharge of 0.20 m³/s having BOD₅ of 500 mg/litre joins the stream at a location and ins...

Which one of the following options contains ONLY primary air pollutants?

Analysis of a water sample revealed that the sample contains the following species. CO3^2-, Na+, H+, PO4^3-, Al3+, H2CO3, Cl-, Ca2+, Mg2+, HCO3-, Fe2+, OH- Concentrations of which...

Which one of the following is a secondary pollutant?

A completely mixed dilute suspension of sand particles having diameters 0.25, 0.35, 0.40, 0.45 and 0.50 mm are filled in a transparent glass column of diameter 10 cm and height 2.5...

Sedimentation basin in a water treatment plant is designed for a flow rate of 0.2 m³/s. The basin is rectangular with a length of 32 m, width of 8 m, and depth of 4 m. Assume that...

As per Noise Pollution (Regulation and Control) Rules 2000 of India, the day time noise limit for a residential zone, expressed in dB(A) Leq. is

The most important type of species involved in the degradation of organic matter in the case of activated sludge process is

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...

In the figures, Group I represents the atmospheric temperature profiles (P, Q, R and S) and Group II represents dispersion of pollutants from a smoke stack (1, 2, 3 and 4). In the...

The equivalent sound power level (in dB) of the four sources with the noise levels of 60 dB, 69 dB, 70 dB and 79 dB is _________

The spherical grit particles, having a radius of 0.01 mm and specific gravity of 3.0, need to be separated in a settling chamber. It is given that • g = 9.81 m/s² • the density of...

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°C and the temperature of the stream C...

The wastewater having an organic concentration of 54 mg/l is flowing at a steady rate of 0.8 m³/day through a detention tank of dimensions 2 m × 4 m × 2 m. If the contents of the t...