WASTE WATER TREATMENT - T07

TASTE AND ODOUR CONTROL

45 flashcards · Other · by Pavithrayani K

1. Compounds that are primarily responsible for the earthy-musty odour in finished Water. Geosmin MIB Both a and b None of the above

   Both a and b

2. SLR municipalities have implemented various strategies to control the tastes and odours in addition to conventional alum coagulation sedi- mentation and filtration processes . Addition of activated carbon as a powder (PAC) Filtration through granular media (GAC) Both a and b None of the above

   Both a and b

3. Water is chlorinated at point of intake for zebra mussel control and piped approximately _____ km to the purification plant 3.6 2.6 5.8 10.2

   3.6

4. _____________ , as used by the Cornwall Purification Plant, is installed on top of conventional mixed media filter beds. Granular activated carbon Sedimentation Normal Filtration All the above

   Granular activated carbon

5. The most common method of removing hydrogen sulfide from water is by _________ . Aeration Filtration Absorption None of the above

   Aeration

6. Most common types that cause taste and odors are ____________ Cyanophyceae Diatomaceae Chlorophyceae All the above

   All the above

7. They are blue-green in color and float at or near the surface of a surface source. Cyanophyceae Diatomaceae Chlorophyceae All the above

   Cyanophyceae

8. These are one-celled plants reproduce by splitting. The cell walls contain green and brown coloring matter. Dead organisms produce a fishy or geranium odor in the spring and fall. Cyanophyceae Diatomaceae Chlorophyceae All the above

   Diatomaceae

9. These are one-celled green algae that are mostly free floaters which produce a grassy or fishy odor or taste. Cyanophyceae Diatomaceae Chlorophyceae All the above

   Chlorophyceae

10. Chemicals that can create taste and odor in water include, at these concentrations: Formaldehyde 50,000 parts per billion (ppb) Phenols 250 - 4,000 ppb Xylene 300 - 1,000 ppb Refinery hydrocarbons 25 - 50 ppb Chlorinated phenols 1 - 100 ppb Whether the above concentration is true or False True False

    True

11. Phenols and related compounds are often the source of the medicinal taste.The taste of phenols is intensified by the addition of chlorine. True False

    True

12. Ozone is also effective in oxidizing of taste and odor compounds. Ozone changes the characteristics of the taste and odor in addition to reducing the level of the odor-producing compound. Ozone dosages of ____________have been used. 3 mg/l to 5 mg/l 2 mg/l to 5 mg/l 5 mg/l to 10 mg/l 5 mg/l to 2 mg/l

    2 mg/l to 5 mg/l

13. ___________ is a practical solution for taste and odor control when the problem is caused by volatile compounds, such as hydrogen sulfide. Aeration Oxidation Chlorination All the above

    All the above

14. Taste and odors occurring in the distribution system are primarily the result of corrosion of pipe material and/or growth of iron bacteria, such as crenothrix and leptothrix, the water main. If the water has high sulfates and is allowed to stand in dead ends, taste and odor problems may be compounded by sulfate-reducing bacteria. These problems can be rectified only by Proper design of the system, such as eliminating dead ends Providing adequate means of flushing the system Maintenance crews mu…

    All the above

15. Carbon adsorption is also effective in removing methane and hydrogen sulphide in groundwater. Expensive Not expensive

    Expensive

16. 1. Which of the following is used for the control of taste and odor in water? a) Sedimentation b) Coagulation c) Filtration d) Activated carbon

    Activated carbon

17. 2. Granular activated carbon has a surface area of ____________ a) 100-200m2/g b) 500-1400m2/g c) 400-600m2/g d) 500-900m2/g

    500-1400m2/g

18. 3. _______ is produced by passing a carbonaceous material through a heating mechanism at high temperature. a) Potassium per-manganate b) Potassium dichromate c) Activated carbon d) Iodine

    Activated carbon

19. 4. Which of the following is a carbonaceous material? a) Charcoal b) Petroleum c) Hydrogen sulfide d) Sodium chloride

    Charcoal

20. 5. Which of the following is not a property of activated carbon? a) It is impermeable b) It has many carbon atoms with free valencies c) It is available in granular as well as powder form d) It has a prolonged suspension

    It is impermeable

21. 6. The thickness of the activated carbon filter bed is ____________ a) 10-20cm b) 30-80cm c) 75-100cm d) 40-50cm

    10-20cm

22. 7. When activated carbon is applied at more than one point, then it is called ________ a) Dual treatment b) Split treatment c) Sludge treatment d) Carbonaceous treatment

    Split treatment

23. 8. Activated carbon in powder form is applied in the mixing basin. a) True b) False

    True

24. 9. Activated carbon can be applied to raw water ______ treatment process. a) During b) Ahead of c) Before d) After

    Ahead of

25. 10. The dose of activated carbon in powdered form is controlled by ____________ a) Chromatography b) Distillation c) Threshold odor test d) MPN test

    Threshold odor test

26. 11. What is the dose of copper sulfate required for the treatment of water? a) 0.3-0.6ppm b) 2-6ppm c) 4-8ppm d) 10-20ppm

    0.3-0.6ppm

27. 12. What is activated carbon used for?

    Several usages of AC and as soil conditioner.

28. 13. Why is activated carbon used for water purification?

    To remove certain organic chemicals from water.

29. 14.Can activated carbon remove virus?

    Granular activated carbon (GAC) is used in combination with ozonation for removing by products.

30. 15.The source material is developed into carbon using _____________. a)Hot gases b)Cool gases c)Semi hot gases d)Semi cool gases

    Hot gases

31. 1) The method of color removal for industrial effluents include _______________. Biological treatment Dyes Industrial

    Biological treatment

32. 2)The conventional methods of _________________ , such as primary and secondary treatment. a)chemical treatment b)sewage treatment c) hyper filtration

    sewage treatment

33. 3)________________ is an effective method of lowering the concentration of dissolved dyes in the effluent resulting in color removal. a)Adsorption b)oxidation c)absorbent

    Adsorption

34. 4)________________Safe level of colour in discharge waters a)physical b)uv treatment c)platinum cobalt units

    platinum cobalt units

35. 5)The dye can generally be described as a ____________ substance having an affinity for the substrate it is applied to. a) colored b)dye c)insoluble

    colored

36. 6)Anaerobic processes which convert organic contamination into _____________. a)oxygen b)methane and carbon dioxide c)nitrogen

    methane and carbon dioxide

37. 7) Iron and manganese occur naturally in _______________. a)groundwater b)sewage c)rainwater

    groundwater

38. 8)Surface water generally does not contain large amounts of_______________. a)iron b)manganese c) iron or manganese

    iron or manganese

39. 9)Iron in drinking water_________. a)0.03ppm b)0.3ppm c)3ppm

    0.3ppm

40. 10)Manganese in drinking water_________ a)0.03ppm b)0.05ppm c)0.5ppm

    0.05ppm

41. 11)Removal is usually achieved through _____________ a)ion exchange or oxidation b)desalination c)phosphate treatment

    ion exchange or oxidation

42. 12)iron and manganese concentration up to __________ a)0.01ppm b)1.0mg/l c)1.1mg/l

    1.0mg/l

43. 13)Clothing washed in water containing excessive iron and maganese become stained a ___________. a)reddish brown color b)brownish color c)yellowish color

    brownish color

44. 14)Iron and manganese can give an ____________. a)pleasant b)unpleasant

    unpleasant

45. 15)Shallow wells contain_____________ a)iron b)manganese c)colloidal manganese

    colloidal manganese