Tracking Toxic Substances at Industrial Facilities Engineering Mass Balance Versus Materials Accounting (1990) / Chapter Skim
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2. Approaches to Obtaining Mass Balance Information
2. Approaches to Obtaining Mass Balance Information
Pages 15-22
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From page 15... ...
The components of the SARA mass balance definition fit closely with the traditional EMB approach. However, the goals of a mass balance analysis also could be sometimes met through information collection using MA.
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From page 16... ...
EMB uses measurement data and judgment (McMichael, 1988~. The measurements require knowledge of conservation of mass and of the standard units for expressing mass data as well as flow rates, determinations of chemical mass, accumulation, and the compositions and concentrations of specific chemicals within streams flowing through a facility.
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From page 18... ...
Many listed chemicals flowing through the reporting facilities occur in multiple phases and are routed through multiple process streams. MATERIALS ACCOUNTING PRACTICES OF POTENTIAL UTILITY MA is a means of obtaining mass balance information that uses readily available information on material flow across facility boundaries.
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From page 19... ...
Because the sulfuric acid is transformed into sulfate compounds as it flows through the pickling operation, MA can be applied more effec 19 tively by an approximate accounting of the sulfate flowing through the pickling operation based on purchase and waste disposal and treatment records. The facility's purchase records provide the annual usage of sulfuric acid from which the sulfate input can be calculated.
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20 _ ~ o ._ _ J of _ ~ Q A Ct C CL 03 o Ct 0 o .
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21 b j - - - - - - - - - - - - - - - - mu.
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From page 22... ...
as a potential method for estimating environmental releases by taking the difference between input and product quantities (EPA, 1987~. However, EPA cautions that significant release estimate errors can result from this procedure due to relatively small errors in the quantities used to estimate the releases.
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