Water and Waste Water Treatment Question Bank

Replies

• 

  Ankita Katdare

  Q11 State the design criteria for Flash mixer.
  Q12Design the flash mixer for the design discharge of 250 m3 / hr.
  Q13 What are the different methods of mixing device and explain each in detail.
  Q14 Explain the relation of pH – alkalinity and turbidity in the coagulation.
  Q15 – Explain the theory of flocculation.
  Q16 State the design steps for floculator as per CPEEO.
  Q17 Design the clarrifloculator for the design flow 250 m3 / hr . Assume suitable data.
  Q18 What are the factors on which the sedimentation depend. And explain in brief.
  Q19 Prove that removal of particulate is depend on the plan area only.
  Q20 Write short note on ‘ Tube Settler’
  Q21 Explain in detail the procedure for flocculate and discrete particulate removal from
  Sedimentation tank.
  Q22 3.785 MLD passes through a sedimentation basin, which is 6m, wide, 15 m long
  and 3 m deep.
  a) Find the detention time for the basin
  b) What is the average velocity of flow through the basin
  c) If the suspended solid content of water averages 40 ppm, what weight of dry
  solids will be deposited every 24 hours? Assuming 75 percent removed in basin?
  d) Calculate surface overflow rate.
  Q23 – Design a settling basin is designed to have a surface overflow rate of 32.6 m/day.
  Determine the overall removal obtained for a suspension with size distribution
  given below. G = 1.2 and dynamic viscosity 1.027 centipoises and density 0.997
  gm/cm3.
• 

  Ankita Katdare

  Q24 What is the criteria for sand used in the filter.
  Q26 State the difference between slow and rapid sand filter.
  Q27 Write a short note on classification of filter.
  Q28 What are the problems in Filter and Explain the theory of filtration.
  Q29. What is air binding ( Negative head in filter) Explain in brief.
  Q30 Find the depth of filter bed for the following data
  Filtration rate = 5 m3/m2/ hr.
  Diameter of particle 0.6mm
  Loss of head = 2.5 m
  Q31 Estimate the depth of gravel bed for 2mm,5mm and 10mm.Assume suitable data.
  Q32 Design completely a rapid sand filter for a town having total filtered water
  requirement of 6 MLD. Assume suitable data. Assume 3% of filtered water required
  for back washing.
• 

  Ankita Katdare

  Q34 What do you understand by loss of head and negative head in rapid sand filter?
  What are their permissible limit? What will happen when negative head is
  excessive?
  Q35 Explain the chemistry of chlorination
  Q36 What are the factors affecting bacterial efficiency of chemical disinfectant
  ( Clorine).?
  Q37 Write short note on Ozone and Uv disinfectant.
  Q36 Write short note on disinfecting action of chlorine.
  Q38 What is break point chorination. Explin the under what condition it is advocated?
  Q39 State the requirements of disinfectant?
  Q40 Explain the kinetics of Disinfections.
• 

  Ankita Katdare

  Q42 Chlorine usage in the treatment of 20000 cubic meter of water per day is 8 Kg/day.
  The residual chlorine after 10 mints contact is 0.2 mg/L calculate the dose of
  chlorine in mg/L and chlorine demand of water?
  Q43 Calculate the quantity of bleaching powder required per year for disinfecting 5 MLD
  water. The dose of chlorine ha to be 0.3 ppm and bleaching powder contain 30% of
  available chlorine.
  Q44 If 0.7 mg/L of total chlorine is required for satisfaction disinfections of water at
  pH =7.0. What dosage will be necessary at pH = 8.0 If it is given that initially 12
  minutes contact time is required at pH 7.0 Find the time of contact required at pH =
  8.0 if n= 1.5 in the equation Cn t = Constant. Take Ki = 2.7 x 10-8 mol/L.
  Q45. What are the different methods for removal of iron and Manganese? Explain each
  in brief . what the permissible limit in drinking water and what happens if these
  are more than permissible limit in drinking water.
• 

  CIVILPRINCESS

  hey nice collection akd 😁
  i've got most of these questions this sem in my environmental engineering paper. 😀 and i have that exam next 😁
• 

  ShrinkDWorld

  Q20 Write short note on ‘ Tube Settler’

  what is tube settler?????
• 

  CIVILPRINCESS

  tube settler is used in water treatment.
  normally the traditional process which is the sedimentation tanks (where water is allowed to stand after adding coagulant for the impurities to settle to bottom.) is used. but the sedimentation tanks use up a lot of space. so the other methods like tube settler are used in its place.
  the process of sedimentation is very effective if the height of standing water is less. so when we use small diameter pipes which have high wetted perimeter and providing laminar flow (smooth flow with no turbulence) the rate of settling of impurities is high and this is called tube settlers. 😀
• 

  Nikhil Gurav

  Please help me guyz....
  I want plan of water treatment plant... Its very urgent...
  
  Plz help me....