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 Code of Federal Regulations (Last Updated: May 6, 2024)
 Title 40 - Protection of Environment
 Chapter I - Environmental Protection Agency
 SubChapter C - Air Programs
 Part 63 - National Emission Standards for Hazardous Air Pollutants for Source Categories
 Subpart G - National Emission Standards for Organic Hazardous Air Pollutants From the Synthetic Organic Chemical Manufacturing Industry for Process Vents, Storage Vessels, Transfer Operations, and Wastewater

  Figure 1 to Subpart G of Part 63 - Definitions of Terms Used in Wastewater Equations  

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  • Figure 1 to Subpart G of Part 63 - Definitions of Terms Used in Wastewater Equations

    Main Terms

    AMR = Actual mass removal of Table 8 and/or Table 9 compounds achieved by treatment process or a series of treatment processes, kg/hr.

    C = Concentration of Table 8 and/or Table 9 compounds in wastewater, ppmw.

    CG = Concentration of TOC (minus methane and ethane) or total organic hazardous air pollutants, in vented gas stream, dry basis, ppmv.

    CGc = Concentration of TOC or organic hazardous air pollutants corrected to 3-percent oxygen, in vented gas stream, dry basis, ppmv.

    CGS = Concentration of sample compounds in vented gas stream, dry basis, ppmv.

    E = Removal or destruction efficiency, percent.

    Fbio = Site-specific fraction of Table 8 and/or Table 9 compounds biodegraded, unitless.

    fbio = Site-specific fraction of an individual Table 8 or Table 9 compound biodegraded, unitless.

    Fm = Compound-specific fraction measured factor, unitless (listed in table 34).

    Fr = Fraction removal value for Table 8 and/or Table 9 compounds, unitless (listed in Table 9).

    Fravg = Flow-weighted average of the Fr values.

    i = Identifier for a compound.

    j = Identifier for a sample.

    k = Identifier for a run.

    K2 = Constant, 41.57 * 10−9, (ppm)−1 (gram-mole per standard m3) (kg/g), where standard temperature (gram-mole per standard m3) is 20 °C.

    m = Number of samples.

    M = Mass, kg.

    MW = Molecular weight, kg/kg-mole.

    n = Number of compounds.

    p = Number of runs.

    %O2d = Concentration of oxygen, dry basis, percent by volume.

    Q = Volumetric flowrate of wastewater, m3/hr.

    QG = Volumetric flow rate of vented gas stream, dry standard, m3/min.

    QMG = Mass flowrate of TOC (minus methane and ethane) or organic hazardous air pollutants, in vented gas stream, kg/hr.

    QMW = Mass flowrate of Table 8 and/or Table 9 compounds in wastewater, kg/hr.

    ρ = Density, kg/m3.

    RMR = Required mass removal achieved by treatment process or a series of treatment processes, kg/hr.

    tT = Total time of all runs, hr.

    Subscripts

    a = Entering.

    b = Exiting.

    i = Identifier for a compound.

    j = Identifier for a sample.

    k = Identifier for a run.

    m = Number of samples.

    n = Number of compounds.

    p = Number of runs.

    T = Total; sum of individual.

    [59 FR 19468, Apr. 22, 1994, as amended at 59 FR 29201, June 6, 1994; 61 FR 63629, Dec. 12, 1995; 62 FR 2779, Jan. 17, 1997; 63 FR 67793, Dec. 9, 1998; 64 FR 20195, Apr. 26, 1999; 65 FR 78284, Dec. 14, 2000; 66 FR 6935, Jan. 22, 2001]