Chemical Dose

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Chemical Dose

Alum/Polymer/Chlorine

1. The optimum alum dose as shown by a jar test is 11 mg/L. Determine the setting

on the liquid alum chemical feeder in ml/minute when plant flow is 5 MGD. The

liquid alum delivered to the plant contains 640 mg/ml of liquid solution.

2. The optimum alum dose as shown by a jar test is 10 mg/L. Determine the setting

on the liquid alum chemical feeder in ml/minute when plant flow is 8 MGD. The

liquid alum delivered to the plant contains 630 mg/ml of liquid solution.

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3. The optimum alum dose as shown by a jar test is 12 mg/L. Determine the setting

on the liquid alum chemical feeder in ml/minute when plant flow is 12 MGD.

The liquid alum delivered to the plant contains 650 mg/ml of liquid solution.

4. The optimum alum dose as shown by a jar test is 9 mg/L. Determine the setting

on the liquid alum chemical feeder in ml/minute when plant flow is 2.2 MGD.

The liquid alum delivered to the plant contains 600 mg/ml of liquid solution.

Chemical Dose

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5. The optimum alum dose as shown by a jar test is 8.8 mg/L. Determine the setting

on the liquid alum chemical feeder in ml/minute when plant flow is 3.5 MGD.

The liquid alum delivered to the plant contains 640 mg/ml of liquid solution.

6. The optimum alum dose as shown by a jar test is 13 mg/L. Determine the setting

on the liquid alum chemical feeder in ml/minute when plant flow is 1.5 MGD.

The liquid alum delivered to the plant contains 610 mg/ml of liquid solution.

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7. The optimum alum dose as shown by a jar test is 11 mg/L. Determine the setting

on the liquid alum chemical feeder in gallons/day when plant flow is 5 MGD.

The liquid alum delivered to the plant contains 5.3 pounds per gallon of liquid

alum solution.

8. The optimum alum dose as shown by a jar test is 12 mg/L. Determine the setting

on the liquid alum chemical feeder in gallons/day when plant flow is 6 MGD.

The liquid alum delivered to the plant contains 4.9 pounds per gallon of liquid

alum solution.

Chemical Dose

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9. The optimum alum dose as shown by a jar test is 14 mg/L. Determine the setting

on the liquid alum chemical feeder in gallons/day when plant flow is 4 MGD.

The liquid alum delivered to the plant contains 5.8 pounds per gallon of liquid

alum solution.

10. The optimum alum dose as shown by a jar test is 17 mg/L. Determine the setting

on the liquid alum chemical feeder in gallons/day when plant flow is 3.5 MGD.

The liquid alum delivered to the plant contains 5.5 pounds per gallon of liquid

alum solution.

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11. The optimum alum dose as shown by a jar test is 13 mg/L. Determine the setting

on the liquid alum chemical feeder in gallons/day when plant flow is 5.5 MGD.

The liquid alum delivered to the plant contains 4.8 pounds per gallon of liquid

alum solution.

12. The optimum alum dose as shown by a jar test is 19 mg/L. Determine the setting

on the liquid alum chemical feeder in gallons/day when plant flow is 7.5 MGD.

The liquid alum delivered to the plant contains 5.1 pounds per gallon of liquid

alum solution.

Chemical Dose

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13. Find the chemical feed in lb/day of polymer from a chemical feed pump. The

polymer solution is 1.4% (14,000 mg/L). Assume that the specific gravity of the

polymer solution is 1.0. During a pump catch, the feed pump delivered 850 ml

over a 5 minute period.

14. Find the chemical feed in lb/day of polymer from a chemical feed pump. The

polymer solution is 1.6% (16,000 mg/L). Assume that the specific gravity of the

polymer solution is 1.0. During a pump catch, the feed pump delivered 1,200 ml

over a 4 minute period.

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15. Find the chemical feed in lb/day of polymer from a chemical feed pump. The

polymer solution is 1.2% (12,000 mg/L). Assume that the specific gravity of the

polymer solution is 1.0. During a pump catch, the feed pump delivered 950 ml

over a 4 minute period.

16. Find the chemical feed in lb/day of polymer from a chemical feed pump. The

polymer solution is 1.4% (14,000 mg/L). Assume that the specific gravity of the

polymer solution is 1.0. During a pump catch, the feed pump delivered 1,000 ml

over a 6 minute period.

Chemical Dose

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17. Find the chlorinator setting in lb/24 hr to treat an incoming flow of 8 MGD with a

dose of 3.6 mg/L.

18. Find the chlorinator setting in lb/24 hr to treat an incoming flow of 4 MGD with a

dose of 2.0 mg/L.

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19. Find the chlorinator setting in lb/24 hr to treat an incoming flow of 5 MGD with a

dose of 2.5 mg/L.

20. Find the chlorinator setting in lb/24 hr to treat an incoming flow of 7 MGD with a

dose of 3.8 mg/L.

Chemical Dose

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21. Find the chlorinator setting in lb/24 hr to treat an incoming flow of 3.5 MGD with

a dose of 2.2 mg/L.

22. Find the chlorinator setting in lb/24 hr to treat an incoming flow of 0.8 MGD with

a dose of 4.0 mg/L.

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Chemical Feed Pump Calibration and Setting

23. Determine the actual chemical feed in lb/day from a dry chemical feeder. A

bucket placed under the chemical feeder weighs 0.25 lb empty. After 30 minutes,

the bucket and the chemical weigh 2.3 lb.

24. Determine the actual chemical feed in lb/day from a dry chemical feeder. A

bucket placed under the chemical feeder weighs 0.25 lb empty. After 15 minutes,

the bucket and the chemical weigh 1.5 lb.

Chemical Dose

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25. Determine the actual chemical feed in lb/day from a dry chemical feeder. A

bucket placed under the chemical feeder weighs 0.25 lb empty. After 20 minutes,

the bucket and the chemical weigh 2.8 lb.

26. Determine the actual chemical feed in lb/day from a dry chemical feeder. A

bucket placed under the chemical feeder weighs 0.25 lb empty. After 60 minutes,

the bucket and the chemical weigh 5.6 lb.

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27. A chemical feed pump lowered the chemical tank level 1 foot, 4 inches over an 8

hour shift. The tank is round with a 3 foot diameter. Find the feed rate in gallons

per minute and gallons per day.

28. A chemical feed pump lowered the chemical tank level 2 feet over an 8 hour shift.

The tank is round with a 4 foot diameter. Find the feed rate in gallons per minute

and gallons per day.

Chemical Dose

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29. A chemical feed pump lowered the chemical tank level 3 feet, 6 inches over a 10

hour shift. The tank is round with a 4.5 foot diameter. Find the feed rate in

gallons per minute and gallons per day.

30. A chemical feed pump lowered the chemical tank level 3 feet over a 24 hour

period. The tank is round with a 3 foot diameter. Find the feed rate in gallons per

minute and gallons per day.

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31. A chemical feed pump lowered the chemical tank level 1 foot, 4 inches over an 8

hour shift. The tank is a cube with a length and width of 4 feet. Find the feed rate

in gallons per minute and gallons per day.

32. A chemical feed pump lowered the chemical tank level 1 foot, 6 inches over a 4

hour period. The tank is a 5 foot cube. Find the feed rate in gallons per minute

and gallons per day.

Chemical Dose

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33. Determine the setting in percent stroke on a chemical feed pump to deliver 3.0

mg/L of polymer. The flow is 450 gpm. The polymer strength is 4.5%. The

pump has a maximum capacity of 90 gallons per day at a setting of 100%

capacity.

34. Determine the setting in percent stroke on a chemical feed pump to deliver 2.5

mg/L of polymer. The flow is 420 gpm. The polymer strength is 5.5%. The

pump has a maximum capacity of 80 gallons per day at a setting of 100%

capacity.

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35. Determine the setting in percent stroke on a chemical feed pump to deliver 3.5

mg/L of polymer. The flow is 550 gpm. The polymer strength is 5.0%. The

pump has a maximum capacity of 100 gallons per day at a setting of 100%

capacity.

36. Determine the setting in percent stroke on a chemical feed pump to deliver 2.0

mg/L of polymer. The flow is 650 gpm. The polymer strength is 4.5%. The

pump has a maximum capacity of 125 gallons per day at a setting of 100%

capacity.

Chemical Dose

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37. Determine the setting in percent stroke on a chemical feed pump to deliver 3.8

mg/L of polymer. The flow is 350 gpm. The polymer strength is 4.0%. The

pump has a maximum capacity of 90 gallons per day at a setting of 100%

capacity.

38. Determine the setting in percent stroke on a chemical feed pump to deliver 2.4

mg/L of polymer. The flow is 550 gpm. The polymer strength is 4.5%. The

pump has a maximum capacity of 90 gallons per day at a setting of 100%

capacity.