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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)?
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(a) Derive a mathematical expression for Maximum length of path of Contact, Maximum Length of Arc of Contact and Contact Ratio in case of Interference. (b) What do you understan
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Determine the concurrent forces: Four coplanar concurrent forces act at point and keep it at rest. These are mention in Figure. Determine the forces P and Q. Solution
Q. Can you explain Pneumatic gauges? Pneumatic gauges permit reading or recording water level at some distance from the river, say up to about 305 m. In a diaphragm type gauge,
A Common Cell Control Software In this section, fine and common implemented cell control software are developed, that is based upon a transition table, to show the restriction
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