1.a. Write objective and methodology adopted for clearing of rivers in National River Cleaning Plan

1.b. Draw a process flowchart for sewage treatment plant (STP) consisting primary and secondary treatment.

2.a. Determine treatability index of wastewater for given data and suggest type treatment with respect to treatability index.

Given data:

2.b. What is the sludge bulking? Explain the control measures for the same.

3.a. Differentiate conventional and high rate tricking filter.

3.b. Write the different disposal methods of grit and explain any one method of disposal of grit.

4.a. Write Streeter-Phelps equation and explain the meaning each term involved in it

4.b. Write working principle of rotating biological contractor, advantages and disadvantages.

5.a. Write working principle of purification of wastewater treatment of root zone cleaning system; draw its schematic sketch and write its application.

5.b. Design an oxidation pond for following data.

i) Location $=28^{\circ}$ latitude

ii) BOD loading at 28 latitude = 200 kg /ha / d

iii) Elevation =1200 m above sea level.

iv) Mean monthly temperature =35$^\circ$C maximum and 15$^\circ$C minimum.

v) Sky clearance is more than 75%.

vi) Population to be served = 25000.

vii) Sewage flow = 1001 pcd

viii) Inlet BOD₅ = 200mg/1

ix) Desired effluent BOD = 20 mg/1

x) Pond removal constant at 20$^\circ$C = 0.1/d

6.a. Design an aerated lagoon tor hollowing data.

i) Raw sewage flow = 20 MLD

ii) Raw sewage BOD₅ = 200 mg/l

iii) Desired BOD₅ = 20 mg/l

iv) Kinetic constant : Y = 0.6/d BOD removal rate constant (K_d) at 20C = 0.1/d

v) Hydraulic retention time (SRT) = 6 days.

vi) Endogenous decay coefficient kd = 0.06

vii) Mean cell residence time = 10 days

viii) f = 0.68

ix) Assume depth of aerated lagoon = 2m

x)Assume length to width ratio = 3 Determine,

a)Volume and dimensions of aerated lagoon

b) Oxygen requirement

6.b. Write working principle of phytoremediation technology for wastewater treatment; draw its schematic sketch and write its application.

7.a. Write principle and stages of anaerobic digestion. Explain factors affecting digestion process.

7.b. Explain any two methods of sludge disposal with advantages disadvantages and application.

8.a. Draw a neat sketch of up flow anaerobic sludge blanket (UASB) reactor. Explain the principle of working and comment on its suitability for treatment of industrial waste water.

8.b. Draw neat sketch of conventional sludge digester and explain the following :

i) Different stages of digestion process

ii) Design parameters of anaerobic digester.

iii)Capacity of digester.

9.a. Explain with neat sketch equalization and proportioning as applicable to Industrial Wastewater Treatment.

9.b. Explain the following points related to dairy industry.

i) Characteristics of wastewater

ii) Flow sheet of wastewater treatment.

10.a. Explain with a neat sketch importance of neutralization as applicable to Industrial Wastewater Treatment.

10.b. What are the process carried out to recycle and reuse of treated wastewater.

10.c. Explain the following points related to sugar industry:

i) Characteristics of wastewater.

ii) Flow sheet of wastewater treatment.