Coagulation-SofteningHW - ENV 6015 Softening Problem Set 1)...

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ENV 6015 Softening Problem Set 1) Write all the equations required to represent softening and discuss which of these equation apply to the following softening categories: a) lime b) Lime-soda c) Excess Lime d) Spilt Treatment 2) Given the three types of water, determine the most cost-efficient manner of softening 1.0 mgd to the goals given below. Determine the pH of the softening reaction, the chemical dose and cost, and CO 2 requirements for excess lime removal and/or stabilization and the pHs for each water. W a t e r $/lb Purity A B C CaO 3.3 0.95 pH: 7.3 6.5 8.2 Na 2 CO 3 12.3 1.00 Alk*: 300 200 250 CO 2 5.0 1.00 Ca*: 200 250 150 NaOH 8.5 1.00 Mg*: 10 30 100 * a s m g / l C a C O 3 Goals: TH < 100 mg/l CaCO 3 M g < 40 mg/l CaCO 3 A l k < 35 mg/l CaCO 3 p H > pH s 3) Name the trihalomethanes that are regulated and the standard. Given the following equation for THM formation, plot THM formation as a time function for varying pH, TOC, temperature and chlorine dose for the conditions shown in the table below. Discuss implications for plant design. THM = 2.7 (Cl)
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Coagulation-SofteningHW - ENV 6015 Softening Problem Set 1)...

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