A. sludge digestion tank
B. sedimentation tank
C. activated sludge treatment
D. trickling filters
Related Mcqs:
- For normal sludge, the value of sludge index for Indian conditions is________________?
A. 0 to 50
B. 50 to 150
C. 150 to 350
D. 350 to 500 - The working conditions in imhoff tanks are_______________?
A. aerobic only
B. anaerobic only
C. aerobic in lower compartment and anaerobic in upper compartment
D. anaerobic in lower compartment and aerobic in upper compartment - For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as___________________?
A. 4.5 to 6.0
B. 6.5 to 8.0
C. 8.5 to 10.0
D. 10.5 to 12.0 - Which of the following sewers is preferred for combined system of sewage ?
A. circular sewer
B. egg shaped sewer
C. rectangular sewer
D. none of the above - Which of the following retards the self purification of stream ?
A. higher temperature
B. sunlight
C. satisfying oxygen demand
D. none of the above - Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system ?
A. circle method
B. equivalent pipe method
C. Hardy cross method
D. electrical analysis method - Which of the following compounds is widely used for algae control ?
A. sodium sulphate
B. copper sulphate
C. sodium chloride
D. calcium chloride - Which of the following chemical compounds can be used for dechlorination of water ?
A. carbon dioxide
B. bleaching powder
C. sulphur dioxide
D. chloramines - Which of the following values of pH represents a stronger acid?
A. 2
B. 5
C. 7
D. 10 - Which of the following is not a water borne disease ?
A. dysentery
B. cholera
C. typhoid
D. maleria
