WASTE WATER TREATMENT- T10

45 flashcards · Other · by Swetha Lakshmi Parameswaran

1. While designing the aerated lagoon what is the solid retention time considered? a) 7-8 days b) 3-6 days c) 1-2 days d) 10 days

   b) 3-6 days

2. 2. What is the outlet of TSS in ppm obtained when aerated lagoons are used for treatment? a) 500-700 b) 100-400 c) 700-900 d) 900-1200

   b) 100-400

3. Aerated ponds must be shallow. a) False b) True

   a) False

4. What is the minimum depth considered while designing an aerated lagoon? a) 3 m b) 1.5 m c) 2 m d)2.5m

   d)2.5m

5. Natural oxygenation is _______ in aerated ponds while compared to facultative ponds. a) More b) Less c) Equal

   a) More

6. How many types of aerate ponds are present? a) 4 b) 3 c) 2 d)1

   c) 2

7. Which of the following methods consume the most power? a) Anaerobic digestion b) Aerated lagoon c) Aerated lagoon carried out facultatively d) Aerated lagoon with solid recycling

   d) Aerated lagoon with solid recycling

8. Which of the following is not true regarding mechanical aeration? a) Increases oxygen b) Enhances efficiency c) Increases HRT d) Reduces HRT

   c) Increases HRT

9. The increased aeration facilitates ________ pathogen removal. a) Decreased b) Increases c) Slower d) Faster

   b) Increases

10. Aerobic ponds are similar to facultative ponds. a) True b) False

    a) True

11. Activated sludge is done during _________ treatment. a) Primary b) Secondary c) Preliminary d) Tertiary

    b) Secondary

12. The facultative pond functions like a ________ a) Primary clarifier b) Secondary clarifier c) Aerator d) Sedimentation unit

    a) Primary clarifier

13. In facultative ponds, micro-organisms are able to oxidize only dissolved organics. a) True b) False

    b) False

14. How much amount of oxygen should one acre of facultative lagoon must provide per day? a) 10 pounds b) 60 pounds c) 50 pounds d) 90 pounds

    c) 50 pounds

15. What is the maximum allowable temperature in facultative ponds? a) 15˚C b) 20˚C c) 25˚C d) 30˚C

    c) 25˚C

16. What is the process used to remove sand, silt and grit from water? a) Grit chamber b) Grid removal c) Wastewater d) Primary treatment

    b) Grid removal

17. Screening and comminution are preliminary treatment processes. a) True b) False c) none of these

    a) True

18. What represents the heavier inert matter in wastewater? a) Debris b) Waste c) Screens d) Grit

    d) Grit

19. This is a square tank where a mechanical rake continually scrapes grit from the bottom of the tank and drags it to an auger where it is removed ______________. a) Aerated grit chamber b) Detrius Tank c) Grit chamber d) Sedimentation

    b) Detrius Tank

20. What is the first unit operation used at wastewater treatment plants (WWTPs) ? a) Fine screens b) Coarse Screens c) Bar screen d) Screening

    d) Screening

21. What is consist of a rotating slotted cylinder through which wastewater flow passes? a) Comminutors b) Screening c) Grit removal d) Aerated Grit Chamber

    a) Comminutors

22. What is consist of parallel bars, rods or wires, wire mesh or a perforated plates with openings generally of circular or rectangular shapes. a) fine screen b) Coarse screen c) Bar screen d) Micro screen

    b) Coarse screen

23. Typical opening sizes for fine screens are ________________ . a) 1.7 to 6 mm b) 1.5 to 4 mm c) 1.7 to 4 mm d) 1.5 to 6 mm

    d) 1.5 to 6 mm

24. What is a physical water treatment process using gravity to remove suspended solids from water? a) Grit chamber b) Settling c) Sedimentation d) Grit removal

    c) Sedimentation

25. The purpose of sedimentation is to enhance the ______________ process by removing particulates. a) Filtration b) Settling c) Grit d) Gravity

    a) Filtration

26. What is often found in the headworks of wastewater treatment plants (WWTP)? a) wastewater b) Sedimentation particle c) Grit and sand removal d ) Screening

    c) Grit and sand removal

27. _____________________ removes material that will either float or readily settle out by gravity. a) Tertiary treatment b) Primary treatment c) Secondary treatment d) Wastewater treatment

    b) Primary treatment

28. The Primary Settlement or _______________________ are designed to reduce the velocity of the wastewater flow, allowing heavier organic solids (called raw sludge) to settle. a) Primary tanks b) Filtration c) Grit removal d) Sedimentation tanks

    d) Sedimentation tanks

29. What is consists of grit removal, screening, septage handling , and flow Qualification? a) Preliminary treatment b) Secondary treatment c) Primary treatment d) Wastewater treatment

    a) Preliminary treatment

30. Which of the following types of sediments are most abundant? a) coarse clastics b) fine clastics c) chemical d) biochemical

    b) fine clastics

31. The process by which dead organic substance are broken into simpler a) Decomposition b) Terrestrial ecosystem c) Aquatic ecosystem d)none

    a) Decomposition

32. source function of Decomposition a) NH4 + - b) NH4 and N03 c) N03 d) None

    b) NH4 and N03

33. The water with all the dissolved inorganic and organic materials and soil deposited at the bottom. a) organic components b) Abiotic components c) inorganic components d) Autotrophic components

    b) Abiotic components

34. Phytoplanktons, some algae and the floating, submerged and marginal plants found at the edges. a) organic components b) Abiotic components c) inorganic components d) Autotrophic components

    d) Autotrophic components

35. Zooplanktons, which are free swimming and bottom dwellers. a)Primary treatment b) Wastewater treatment c)Consumers d)Decomposers

    c)Consumers

36. Fungi, bacteria and flagellates found abundantly in the bottom. a) Decomposers b) Consumers c) Primary treatment d) Wastewater treatment

    a) Decomposers

37. Mixture of oil and water can be separated by? one marks question answer option type a) Filter paper b) Animal Membrane c) Separating Funnel d)Parchment paper

    c) Separating Funnel

38. A solid substance is dissolved in water. Which of the following methods is used for separating it? a) Distillation b) Evaporation c) Filtration d) Decantation

    c) Filtration

39. Iron is separated from the mixture by a) magnetic separation b) sedimentation c) winnowing d) Sieving

    a) magnetic separation

40. The process of settling down of the particles of an insoluble solid in a liquid is called a) decantation b) sedimentation c) winnowing d) Sieving

    b) sedimentation

41. Air is a a) pure substance b) heterogeneous mixture c) the compound of oxygen and nitrogen d) homogeneous mixture

    d) homogeneous mixture

42. Oil and water can be separated through a) filter paper b) distillation c) evaporation d) separating funnel

    d) separating funnel

43. Which of the following is a heterogeneous mixture? a) a salt solution b) a salt-pepper mixture c) air d) a fizzy drink

    b) a salt-pepper mixture

44. Which of the following is a homogeneous mixture? a) mist b) a sand-water mixture c) an oil-water mixture d) a nitrogen-oxygen mixture

    a) mist

45. Tiny pieces of stones are usually separated from pulses before cooking by the method called a) threshing b) sieving c) hand picking d) winnowing

    c) hand picking