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Question: Chlorination is used for disinfection of the final effluent of a waste water treatment plant. The EPA requires that a certain chlorine residual be maintained. To meet this requirement, the free chlorine residual is measured at the beginning of the chlorine contact basin, as shown in Fig. An aqueous solution of sodium hypochlorite is added to the filter effluent to maintain the free chlorine residual at the contact basin. The amount of sodium hypochlorite required is directly proportional to the flow rate of the effluent. The wastewater plant has two parallel filter effluent streams, which are combined in the chlorine contact basin. Sodium hypochlorite is added to each stream on the basis of the free chlorine residual in the basin.
(a) Design a control scheme to control the chlorine residual at the beginning of the basin.
(b) As a result of a number of reactions occurring in the contact basin, the chlorine residual exiting the basin is not equal to the chlorine residual entering the basin (the one being measured). It happens that the EPA is interested in the exiting chlorine residual. Thus a second analyzer is added at the effluent of the contact basin. Design a control scheme to control the effluent chlorine residual.
An aqueous solution of the organic compound contains 0.500 g per 100 mL and is extracted with 50.0 mL of methylene chloride. What percentage of the organic compound originally in water is extracted?
The reaction A=B+ C is second order in A. when [A}0=0.100M, the reaction is 20% complete in 35 minutes. Calculate the value of the rate constant in ( L/min.mol)
toluene c6h5ch3 is a liquid used in the manufacture of tnt. its normal boiling point is 111.0oc and its molar heat of
Mixtures of helium and oxygen are used in scuba diving tanks to help prevent the bends, which is a condition caused by nitrogen bubbles forming in the bloodstream.
Silicon Carbide (SiC) is a ceramic material with the so-called zinc blende crystal structure. It can be constructed from the FCC unit cell using a two-atom basis consisting of a Si atom at (0,0,0) and a C atom at (¼, ¼ , ¼).
Calculate the molarity of a 31.45 weight percent acidity% muriatic acid solution given that the solution density is 1.17 g ml
what mass of precipitate will form if 1.50 L of concentrated Pb(CLO3) is mixed with 0.550 L of 0.230 M NaI ? assume the reaction goes to completion.
Show that the hydroxide-ion concentration in an aqueous solution is 1x10^-4 M when the hydronium-ion concentration is 1x10^-10 M. Recall that 10^a x 10^b x =10^(a+B)
Intramolecular forces refer to the bonding forces within a molecule. Choose which forces are involved in the following change. those allowing fog to form on a cool, humid evening in Houston a. intramolecular b. intermolecular c. both d. neither
Cyanic acid (HOCN) and isocyanic acid (HNCO) differ in the position of their electrons, but they are not resonance structures. Explain.
Calculate the OH- of each aqueous solution with the following H3O+ A baking soda 1.1 X 10-8 M B orange juice 2.1 X 10-4
61.5 mL of 0.11 M sodium hydroxide were required to completely neutralize 23.7 mL of sulfuric acid. Calculate the concentration of the sulfuric acid solution
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