G. Oxygen 18. We use Ringlemann number to number of 5 indicate opacity of: A, 09
ID: 1714697 • Letter: G
Question
G. Oxygen 18. We use Ringlemann number to number of 5 indicate opacity of: A, 096 B.20% C, 60% opacity ofr to indicate black or gray smoke opacity. The Ringlemann D. 100% 20. What are not biological factors that adversey afect settleability of activated A. Species of dominant microorganisms (filamentous) B. Denitrification in final clarifier (floating solids) C. Excessive volumetric and food/microorganisms loadings D. Excessive agitation during aeration resulting in shearing of floc. 21. Which mode of activation-sludge processes in the right figure? A. Step Aeration B. Contact Stabilization D. High-Purity Oxygen 22. Which of the following functions is a biological process where simple monomers are converted into volatile fatty acids (VFAs)? A. Hydrolysis B. Acidogenesis C. Acetogenesis D. Methanogenesis 23. Bench studies have determined that aluminum sulfate (alum) promotes acceptable floc formation at a dose of 25 mg/L when applied to a surface water source. Design standards for chemical flocculation require flash mixing at a minimum velocity gradient (G) of 1000 /s for 120 s. Total tank volume is 27 m, with four cubic tank dimention of 19 m. Alum is avaible at 10% purity for $200/1000 kg and electrical power costs $0.05/k Wh. The water flow is 19000 m'/d. The water temperature is 20°C. What is the total power required for flashing mixing if the motor efficiency is 85%? A. 22000 w B. 31000 W C. 31765 W D. 41752 W 24. Following the above question, what is the total monthly cost for alum? A. $28000 /month B. $28500 /month C. $29000 /month D. $29500 /monthExplanation / Answer
18) A ringlemann scale is used to measure apparent density of smoke.in use the observer views the plume at the point of greatest capacity and determines the corresponding ringlemans number.A ringleman 0,1,2,3,4 and 5 are equivalent to a capacity of 0,20,40,60,80 and 100.
ans) D- 100%
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