Question 3-a A large city is considering the recycling of wastewater to drinking water due to...

 

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Question 3-a A large city is considering the recycling of wastewater to drinking water due to persistent droughts. The wastewater was analyzed and the following average values were reported: Parameter (units) Flowrate (ML/day) BOD5 (mg/L) Influent value 40 400 Suspended solids (mg/L) 200 Total dissolved salts (mg/L) 500 E. Coli (cfu/100 mL) 10⁹ Total Nitrogen (mg/L) 50 Total Phosphorus (mg/L) 0 You have been asked to propose a schematic flowsheet of the various units required to treat this water to a standard suitable for drinking. Make sure that you include only the treatment steps that are necessary. For each unit, 1. Explain its purpose 2. Provide the likely water quality values for the seven parameters listed above in the effluent of each unit that you propose and justify. Question 3-a A large city is considering the recycling of wastewater to drinking water due to persistent droughts. The wastewater was analyzed and the following average values were reported: Parameter (units) Flowrate (ML/day) BOD5 (mg/L) Influent value 40 400 Suspended solids (mg/L) 200 Total dissolved salts (mg/L) 500 E. Coli (cfu/100 mL) 10⁹ Total Nitrogen (mg/L) 50 Total Phosphorus (mg/L) 0 You have been asked to propose a schematic flowsheet of the various units required to treat this water to a standard suitable for drinking. Make sure that you include only the treatment steps that are necessary. For each unit, 1. Explain its purpose 2. Provide the likely water quality values for the seven parameters listed above in the effluent of each unit that you propose and justify.

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