The following table shows the annual inputs of phosphorus to Lake Erie:
A | Short Tons/Yr |
Source |
|
Lake Huron | 2240 |
Land drainage | 6740 |
Municipal waste | 19,090 |
Industrial waste | 2030 |
Total of sources | 30,100 |
Outflow | 4500 |
Retained | 25,600 |
a. Convert the retained phosphorus to concentration in micrograms per liter, assuming that Lake Erie contains 1.2 × 1014 gal of water and that the average phosphorus retention time is 2.60 yr.
b. What percentage of the input comes from municipal water?
c. What percentage of the input comes from detergents, assuming they represent 70% of the municipal waste?
d. If 10 ppb of phosphorus triggers nuisance algal blooms, as has been reported in some documents, would removing 30% of the phosphorus in the municipal waste and all the phosphorus in the industrial waste be effective in reducing the eutrophication (i.e., the unwanted algal blooms) in Lake Erie?
e. Would removing all of the phosphate in detergents help?
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