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2. Assume that the river has been selected as the source of raw water for the 2.0mgd demand.
a. Surface water has low alkalinity, high turbidity. The distribution system is cast iron pipe. What's the concern with using alum (Al2(SO4)3) as the coagulant. What other chemical could be used?
b. A slow sand filter will follow the coagulation-flocculation-sedimentation. The organic content in the raw water supports a biofilm on the filter surface. How might this reduce the disinfectant dosage? What text Figure shows this?
c. The 4' thick filters run q=500 gpd/ft2. Find the total area of filter surface required to treat the 2.0 mgd. Also compute the hydraulic residence time in the filter.
d. The filtered water still has traces of ammonia and dissolved organics. Calcium hypochlorite Ca(OCl)2 is used for disinfection. What's the advantage, what's the potential problem with using the hypochlorite rather than using ultraviolet (UV)?
Cylinder : As the name implies it is a cylindrical vessel or space in which the piston makes a reciprocating motion (forward and backward). The varying volume created in the cylin
Question Suppose T 1 and T 2 are independent and identically distributed Exponential variables with common hazard λ. What is the density of T = T 1 + T 2 ? What is the E(T-1
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torque
Q. Maintenance requirement at storage tanks? Little maintenance is required at storage tanks; sometimes access is required for equipment used to remove accumulated solids (this
CONCURRENT FORCES
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Pin-jointed steel structure: Find out the forces in the members of the pin-jointed steel structure. Solution Joint D Suppose f CD and f DE both as tensile forc
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