Nutrient Removal Project: Chemical Phosphorus Removal Jill Crispell, Stephanie Wedekind, Sarah...
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![Page 1: Nutrient Removal Project: Chemical Phosphorus Removal Jill Crispell, Stephanie Wedekind, Sarah Rosenbaum.](https://reader030.fdocuments.in/reader030/viewer/2022032517/56649c865503460f9493dbb0/html5/thumbnails/1.jpg)
Nutrient Removal Project: Nutrient Removal Project: Chemical Phosphorus RemovalChemical Phosphorus Removal
Jill Crispell, Stephanie Wedekind, Sarah Rosenbaum
![Page 2: Nutrient Removal Project: Chemical Phosphorus Removal Jill Crispell, Stephanie Wedekind, Sarah Rosenbaum.](https://reader030.fdocuments.in/reader030/viewer/2022032517/56649c865503460f9493dbb0/html5/thumbnails/2.jpg)
ObjectivesObjectives
Reduce the concentration of phosphorus in the effluent of the wastewater treatment plant by precipitating the phosphorus with varying concentrations of metallic salts
Total phosphates should not exceed a concentration of 50ug/L in a stream entering a lake or reservoir
![Page 3: Nutrient Removal Project: Chemical Phosphorus Removal Jill Crispell, Stephanie Wedekind, Sarah Rosenbaum.](https://reader030.fdocuments.in/reader030/viewer/2022032517/56649c865503460f9493dbb0/html5/thumbnails/3.jpg)
HypothesisHypothesisAs the concentration of a metallic salt
added increases, the concentration of phosphorus in the effluent should decrease from 4 mg/L to a value less than 50 g/L.
The final phosphorus concentration will be independent from the concentration of metallic salts at high metallic salts concentrations.
Metallic salts conc.
PhosphorusConc.
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SetupSetup
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SetupSetup
Flow Rate:– 450 mL/min
Reagents:– Phosphorus solution: 200 mg/L KH2PO4
– Alum solution: 400 mg/L Al2(SO4)3 o 14H2O
– Ferric Chloride: 200 mg/L FeCl3
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MethodsMethods
First experiment: Effect of flocs– In each cycle, phosphorus and water added to bring
concentration to 4 mg/L– Only in first cycle alum (12.5 mg/L) or ferric chloride
(6.8 mg/L)
Al2(SO4)3 o 14H2O + 2PO43- 2AlPO4 + 3SO4
2- +14H2O
FeCl3 + PO43- FePO4 + 3Cl-
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Results: First experimentResults: First experiment
Alum was more effective than ferric chloride in removing phosphorus.
Discovered original influent water contained ferric chloride
Flocs remaining in tank continued to react with the phosphorus added
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Results: First experiment cont.Results: First experiment cont.
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alum sample
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Results: First experiment cont.Results: First experiment cont.
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ferric chloride sample
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Results: First experiment cont.Results: First experiment cont.
Solutions to our Discoveries:– Decided to pump tap water into the plant
from a large jug.– Completely drain the tank.– Added two new states, rinse and rinse
effluent, to clean out the tank of all flocs.
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Second experiment: Increasing Second experiment: Increasing concentration of alumconcentration of alum
Different concentrations, 10 mg/L, 12.5 mg/L, 15 mg/L and 25 mg/L, of alum were used to determine which concentration removes phosphorus most efficiently
All samples were analyzed using the spectrophotometer to determine the amount of phosphorus remaining in the effluent.
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Results: Second experimentResults: Second experimentAs alum concentration in the plant
increased, phosphorus concentration decreased and percent removal increased based on samples with 10 mg/L, 12.5 mg/L, 15 mg/L and 25 mg/L of alum respectively
alum concentration (mg/L)
average effluent phosphorus conc. (mg/L)
percent removal
10 1.27 68.1712.5 1.10 72.4215 1.03 74.2025 0.70 82.57
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Results: Second experiment Results: Second experiment cont.cont.
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concentration alum added (mg/L)
conc
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osph
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in e
fflu
ent
(mg/
L)
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Results: Second experiment Results: Second experiment cont.cont.
Although we did not meet our goal of 50 g/L, our high percent removal indicates that the alum is effective
Generally, the trend appears to be decreasing
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Results: Second experiment Results: Second experiment cont.cont.
More testing is necessary to determine if the phosphorus reaches a minimum concentration
There cannot be 100% removal (and thus a linear solution) because there is a saturation level in which additional alum no longer effects phosphorus removal
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Results: Second experiment Results: Second experiment cont.cont.
According to the stoichiometry of the equations, we should have only needed to use a concentration of 12.5 mg/L of alum to completely react with the 4 mg/L of phosphorus, but much more is needed.
Reasons: other reactants in water, more mixing time.
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In the future we would…In the future we would…
Test higher concentrations of alumTry mixing alum and FeCl3
Adjust the pH to be in the optimum range of the coagulants (4.5-5 for FeCl3, 5.5-6.5 for Alum)– Our pH was between 8.3 and 8.4
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THE ENDTHE ENDHave a great summer!Have a great summer!