Environmental Engg.-I

Air binding in rapid sand filters is encountered when

The characteristics of coliform organism are (I) Bacillus; (II) Gram negative; (III) Ferments lactose; (IV) spore forming:

Which of the filters provide the water with highest bacteriological characteristic?

The raw water entering an ideal rectangular settling basin with following particles.\n\n| Particle Type | Settling Velocity (m/h) | Concentration (mg/L) |\n| :--- | :--- | :--- |\n| I | 3 | 100 |\n| II | 1 | 50 |\n\nThe settling basin has surface overflow rate of $3\text{ m}^3\text{/m}^2\text{/h}$ then the concentration of particles in settled water will be:

The argentometric titration for determination of chlorides in water with potassium chromate yield ......... color at end point.

Which of the following is an example of a temporary threshold shift?

Noise level of general conversational speech is:

Describe the MPN test for the determination of bacteriological quality of water.

Describe any four water borne diseases due to pathogens with symptoms and organism responsible for those diseases.

Draw a neat flow diagram for treatment of drinking water sourced from ground water with justification of each treatment unit employed for the treatment.

A 60 cm diameter well 'X' in and unconfined aquifer is being pumped at the rate of 1360 litres/min. Measurements at nearby test wells were made during the test. At a distance of 6 m and 15 m from well 'X' drawdown was 6 m and 1.5 m respectively. The bottom of well is 90 m below the ground water table. (i) Find the hydraulic conductivity of aquifer; (ii) Find the drawdown in the well; (iii) What is the specific capacity of the well?; (iv) Find the maximum rate at which water can be drawn from the well.

Describe the difference between slow and rapid sand filter with their advantages and disadvantage for treatment of drinking water.

Find the terminal settling velocity of a spherical suspended particle of diameter 0.5 mm and specific gravity 2.65 at $20^\circ\text{C}$. The viscosity of water is $1.002 \times 10^{-3}\text{ Ns/m}^2$ at $20^\circ\text{C}$. Also Coefficient of drag ($C_d$) for transitional & turbulent flow for various Reynolds number ($R_e$) can be assumed as follows :\n\n$C_d = \frac{24}{R_e} + \frac{3}{(R_e)^{1/2}} + 0.34$ (transitional)\n\n$C_d = 0.4$ (turbulent)

Explain the term Breakpoint Chlorination and its chemistry in context of disinfection of water supply.

Results of a chlorine demand test on raw water is a as follows :\n\n| Sample No. | Chlorine Dosage (mg/l) | Residual Chlorine after 10 min contact (mg/l) |\n| :--- | :--- | :--- |\n| 1 | 0.2 | 0.19 |\n| 2 | 0.4 | 0.36 |\n| 3 | 0.6 | 0.50 |\n| 4 | 0.8 | 0.48 |\n| 5 | 1.0 | 0.20 |\n| 6 | 1.2 | 0.40 |\n| 7 | 1.4 | 0.60 |\n| 8 | 1.6 | 0.80 |\n\nWhat is the breakpoint dosage ? What is chlorine demand at dosage of 1.2 mg/l?

Describe any two processes for removal or permanent hardness from water

Calculate the total Hardness of water as $CaCO_3$ for following ionic constituents (meq/L) in it.\n\n$Ca^{2+} = 4.7\n $HCO_3^- = 2.5 \n $Mg^{2+} = 1.0$ \n $SO_4^{2-} = 2.9$ \n $Na^+ = 2.2$ \n $Cl^- = 2.5$ \n $CO_2 = 0.6$

What are the different impacts of noise pollution on hearing?

Discuss the Indian regulatory guidelines for noise pollution for different zones.

Heavy metals in drinking water

Fluctuations in water demand

Period of design

Patterns of Distribution system

Stable and Unstable suspensions

Different types of pump used in water supply

Noise pollution prevention