Your wastewater facility releases ~ 82,000 gallons per day and has a permit to release magnesium...

Your wastewater facility releases ~ 82,000 gallons per day and has a permit to release magnesium at a total load of 2700 kg/yr (6.0 kg/day maximum). The facility runs 5 days a week and 11 months per year. Random spot checks of your effluent reveal the following:

Based on the available data, how many days do you estimate you are in and out of attainment with your permit (extrapolate to cover the full 11-month operating period of the facility)? Will you exceed your permitted yearly load? Include calculations, plots, and a summary table to support your answer (also, for full credit).

Date	Conc. magnesium (mg/L)
12-Mar	29 980
17-Mar	15 005
22-Mar	2 268
27-Mar	19 502
11-Apr	12 067
16-Apr	44 047
22-Apr	1 320
29-Apr	13 481
10-May	6 925
17-May	7 856
20-May	10 863
30-May	21 233
4-Jun	13 726
11-Jun	91 340
17-Jun	8 112
23-Jun	37 301
28-Jun	42 649
1-Jul	9 785
5-Jul	36 198
9-Jul	17 721
20-Jul	29 564
6-Aug	63 866
12-Aug	57 050
1-Sep	3 455
10-Sep	51 532

Solutions

Expert Solution

From the information given about maximum magnesium levels, we have 6.0 kg/day maximun of magnesium load. If we calculate the daily load on March, 12^th in the table by using the conversion factor:

Daily load = 29,980 mg/L (82,000 gallon/day)*(3.785 L/gallon)*(1 kg/1*10⁶ mg) = 9,304.9 kg/day

Using it in every row of the table

Based on calculations, the owner of the wastewater facility is out of attainment with his permit every day of the shown in table. Hence, there are no days when the facility would be in of attainment, and it will exceed the permited yearly load.

queen_honey_blossom answered 1 year ago

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