1. Dissolved Oxygen Treatment Calculation Water Treatment Team June 23, 2015 Presenter: Phuong Mai Teammates: Greg Kirton D. Caruthers Cortez Rankin Robert Landsford

2. Objective Calculate the amount of chemical needed to treat dissolved oxygen at 4 ppm (mg/L) in 50 L/hr H 2 O.

3. Dissolved Oxygen Treatment O 2 Feed Water Storage Tank O 2 Na 2 SO 3 Na 2 SO 4 Na 2 SO 3 + ½ O 2  Na 2 SO 4

4. Known H 2 O mass flow rate: 50,000 g/hr (50 L/hr) O 2 mass flow rate in 50 L/hr H 2 O: 0.2 g/hr

5. Unknown Amount of Na 2 SO 3 needed to treat 0.2 g/hr O 2 in 50 L/hr H 2 O.

6. Calculation Basis: 100 g of Na 2 SO 3 Na 2 SO 3 + ½ O 2  Na 2 SO 4

7. (1) Na 2 SO 3 + (½) O 2  (1) Na 2 SO 4

8. Na 2 SO 3 + ½ O 2  Na 2 SO 4

9. Na 2 SO 3 and O 2 Ratio

10. O 2 mass flow rate in 50 L H 2 O: 0.2 g/hr Needed 2 g/hr Na 2 SO 3 to treat (reacts) 0.2 g/hr O 2 in 50 L/hr of H 2 O

11. Conclusions Need 2 g/hr Na 2 SO 3 to treat 0.2 g/hr O 2 in 50 L/hr of H 2 O

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