Great Lakes Binational Toxics Strategy

Stakeholder Forum - 1998

IMPLEMENTING THE BINATIONAL TOXICS STRATEGY
Mercury Workgroup

Mercury Source Sector Assessment for the Great Milwaukee Area
Appendix B

Detailed Calculations for Municipal Wastewater Treatment Source Sector

Mercury Emissions for Jones Island Dewatering and Drying Facility Wet ESP System Exhaust Stack S11.

Data

Date of Test April 13, 1995
Volume Flow rate 32,456,454 standard cubic feet per hour on a dry basis
Mercury Concentration 0.0256 x 10-9 pounds per dry standard cubic foot

Calculation

32,456,454 standard cubic feet per hour on a dry basis x 24 hours per day x 365 days per year x 0.0256 x 10-9 pounds per dry standard cubic foot = 7 pounds per year.


Mercury Quantities in Milorganite

Data

Mercury concentration in Milorganite
1995 - 0.97 milligrams per kilogram (average for the year)

Amount of Milorganite shipped out per year
1995 - 47,151 tons

Calculation

47,151 tons per year x 0.95 to obtain dry weight of Milorganite x 909 kg per ton x 0.97 milligrams of mercury per kilogram of Milorganite / 454,000 milligrams per pound = 87 pounds per year.

Mercury Quantities in Agrilife

Data

Average Mercury concentration in Agrilife
1995 - 4.2 milligrams per kilogram

Amount of Agrilife shipped out in 1995
1995 - 7,285 tons on a dry weight basis

Calculation

7,285 tons x 909 kilograms per ton x 4.2 milligrams of mercury per kilogram of Agrilife / 454,000 milligrams per pound = 61 pounds per year.


Mercury Quantities in filter press cake

Data

Average Mercury concentration in dried cake
1995 - 3.2 mg/kg

Amount of dried cake produced in 1995
1995 - 4,325 tons on a dry weight basis

Calculation

4,325 tons x 909 kilograms per ton x 3.2 milligrams of mercury per kilogram of dried cake / 454,000 milligrams per pounds = 28 pounds per year.

Mercury Quantities from South Milwaukee sludge

Data

Mercury Concentration
2.1 milligrams of mercury per kilogram of dry solids (this is a single 1997 value).

Amount of Sludge Produced
250,000 gallons per month (1995 data)

Calculation

250,000 gallons of sludge per month x 12 months per year x 6 pounds of dry solids per 100 pounds of sludge x 1 cubic meter per 264.2 gallons x 1000 kg per 1 cubic meter of sludge x 2.1 milligrams of mercury per kilogram of dry solids / 454,000 milligrams per pound = 3 pounds of mercury per year.