Sludge Treatment and Disposal MCQ – Environmental Engineering

31. Recirculation in activated sludge process is done to

  1. Dilute the incoming sewage
  2. Dampen the effect of the flow variation
  3. Operate the plant continuously
  4. Supply seed materials to the aeration tank
Answer
Answer. d

32. Sludge drying beds are used to separate water from

  1. raw sludge
  2. primary raw sludge
  3. activated excess sludge
  4. digested sludge
Answer
Answer. d

33. Sludge digestion produces gas with maximum content of

  1. methane
  2. carbon dioxide
  3. hydrogen sulphide
  4. nitrogen
Answer
Answer. a

34. Activated sludge process is a biological process

  1. Aerobic + anaerobic bacteria
  2. Aerobic bacteria + Protozoa + algae
  3. Anaerobic bacteria + fungi
  4. Facultative bacteria + algae
Answer
Answer. b

35. In activated sludge plants, Rising sludge occurs due to

  1. Industrial waste
  2. Low Ph
  3. De-nitrification in the settling tank
  4. Sudden discharge of septic solids
Answer
Answer. c

36. Activated sludge process is an example of _____________ growth process.

  1. anaerobic suspended
  2. aerobic suspended
  3. aerobic attached
  4. anaerobic attached
  5. facultative attached
Answer
Answer. b

37. Which of the following coagulants is singularly effective in producing sludge for the activated sludge process?

  1. Ferric sulphate
  2. Ferric chloride
  3. Alum
  4. Chlorinated copperas
Answer
Answer. d

Adblocker detected! Please consider reading this notice.

We've detected that you are using AdBlock Plus or some other adblocking software which is preventing the page from fully loading.

We don't have any banner, Flash, animation, obnoxious sound, or popup ad. We do not implement these annoying types of ads!

We need fund to operate the site, and almost all of it comes from our online advertising.

Please add electricalvoice.com to your ad blocking whitelist or disable your adblocking software.

×