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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)?
An unsymmetrical I-Section as shown in figure below. If maximum bending stress is not extend more than 40MPa in the section than find out the moment which it can bear
Incompletely Constrained Motion: While a connection among the elements, building a pair is such that the constrained motion is not done by itself, but by some other means. Such a
Brass is an alloy of (A) Copper and zinc. (B) Copper and iron. (C) copper and Aluminium. (D) Copper and tin. Ans: Brass is an alloy of copper and zin
Find Cutting Speed for Prolonging Tool Life A form tool machining at 24 m/minute requires re-sharpening after 30 minutes. What should be the cutting speed for prolonging tool
Interpoles or commutating poles Interpoles are ?xed to the frame in among main poles. They are used for sparkless commutation, i.e, to improve commutation.
The following items should be considered regarding the safe access and location of buildings: • The fire fighting pump house is usually located in a non-hazardous OSBL location
The average heat transfer co efficient for flow of 100 o C air over a flat plate is calculated by observing the temperature time history of a 3mm thick copper slab exposed 100 o
Explain the Feature of screw conveyor Screw conveyor has such feature as simple structure compact transverse dimension convenient maintenance enclosed delivery and small produc
A temperature control process has a first-order response with a step response time of 12 seconds. In selecting a temperature sensor for the control system for the process, for what
I need rewording
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