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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)?
Determine whether the following functions can be used as Airy stress functions, if so what kind of stress states they present a) ? = 20y 3 b) ? = 3y 2 +4x 3 y c
how to solve engineering mechanics statics problem?
Q. Heat Exchangers - air-conditioning guidelines? Location, size and capacity clearly indicated. Control valves indicated. Space for tube removal, keep space clear of pipes, va
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Kinetics of Rigid Bodies: For the bodies undergoing plane motion, a common scheme for solutions is to apply the equations of dynamic equilibrium as below. ∑ F x = m a x
A wooden cylinder (specific gravity = 0.6) of circular cross - section having length L and diameter D floats in water. Find the maximum permissible (L/D) ratio so that the cylinder
Types of Culverts: Culverts are constructed with various materials and to different designs. The popular forms are : (a) Temporary stone scuppers (b) Stone slab culverts
Calculate the radius of plates: A laminated steel spring, simply supported at the ends & centrally loaded, along a span of 0.8 m; is needed to carry a proof load of 8 kN; and
Construct a retrograde Vernier scale: During construct a retrograde Vernier to a scale of 1/5, signify inches and 10 th , and 30 inches and long sufficient to read to mark dis
Drynes s Fraction of Steam: Dryness fraction of steam is factor which used to specify the quality of steam. It can be defined as the ratio of weight of dry steam W d s pr
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