If the coefficient of specific lethality k for

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If the coefficient of specific lethality (k) for Giardia inactivation by OCl - is 0.0158 L/(mg*min), what percent of Giardia will be removed by the system when the pH is 10.5? Note: assume the contribution of HOCl is negligible at this pH. 2. A surface-water treatment plant is being designed and will employ granular filtration as part of its treatment train. The plant needs to treat 0.85 m 3 /s of water. A consulting company has been contracted to design and install filters that will be 7 × 10 m in size and provide a loading rate of 9.5 m/h with a 72 h cycle time (including 20 minutes for backwashing and 15 minutes for rinsing). a. What is the effective filtration rate (r eff ) for these filters? b. How many filters are needed to meet the 0.85 m 3 /s flow required?
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EVEG 3110 Name: _________________ Date: _________ c. How much additional flow (in m 3 /s) can the plant handle before new filters must be added? 3. A hollow fiber membrane module contains 6430 fibers. The fibers are 1.85 m long with an outside diameter of1.3 mm and an inside diameter of 0.7 mm. Calculate the water production from one module if the flux is 75 L/m 2 ·h and the flow direction is (1) outside in and (2) inside out. Compare the two answers. 4. A reverse osmosis plant treats feedwater containing 2,000 mg/L of salts to yield 3×10 6 L/day of product water. The recover ( r ) for the system is 73% (see diagram). Feedwater Product water Membrane Brine
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EVEG 3110 Name: _________________ Date: _________ a. What flow rate must be provided to the membrane process to produce the required flow? b. If the process has an R log value of 2, what mass of salts are rejected per day?
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