[Code of Federal Regulations]
[Title 40, Volume 26]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR503.41]

[Page 850-851]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 503--STANDARDS FOR THE USE OR DISPOSAL OF SEWAGE SLUDGE--Table of Contents
 
                         Subpart E--Incineration
 
Sec. 503.41  Special definitions.

    (a) Air pollution control device is one or more processes used to 
treat the exit gas from a sewage sludge incinerator stack.
    (b) Auxiliary fuel is fuel used to augment the fuel value of sewage 
sludge. This includes, but is not limited to, natural gas, fuel oil, 
coal, gas generated during anaerobic digestion of sewage sludge, and 
municipal solid waste (not to exceed 30 percent of the dry weight of 
sewage sludge and auxiliary fuel together). Hazardous wastes are not 
auxiliary fuel.
    (c) Average daily concentration is the arithmetic mean of the 
concentration of a pollutant in milligrams per kilogram of sewage sludge 
(dry weight basis) in the samples collected and analyzed in a month.
    (d) Control efficiency is the mass of a pollutant in the sewage 
sludge fed to an incinerator minus the mass of that pollutant in the 
exit gas from the incinerator stack divided by the mass of the pollutant 
in the sewage sludge fed to the incinerator.
    (e) Dispersion factor is the ratio of the increase in the ground 
level ambient air concentration for a pollutant at or beyond the 
property line of the site where the sewage sludge incinerator is located 
to the mass emission rate for the pollutant from the incinerator stack.
    (f) Fluidized bed incinerator is an enclosed device in which organic 
matter and inorganic matter in sewage sludge are combusted in a bed of 
particles suspended in the combustion chamber gas.
    (g) Hourly average is the arithmetic mean of all measurements, taken 
during an hour. At least two measurements must be taken during the hour.
    (h) Incineration is the combustion of organic matter and inorganic 
matter in sewage sludge by high temperatures in an enclosed device.
    (i) Incinerator operating combustion temperature is the arithmetic 
mean of the temperature readings in the hottest zone of the furnace 
recorded in a day (24 hours) when the temperature is averaged and 
recorded at least hourly during the hours the incinerator operates in a 
day.
    (j) Monthly average is the arithmetic mean of the hourly averages 
for the hours a sewage sludge incinerator operates during the month.
    (k) Performance test combustion temperature is the arithmetic mean 
of the average combustion temperature in the hottest zone of the furnace 
for each of the runs in a performance test.
    (l) Risk specific concentration is the allowable increase in the 
average daily ground level ambient air concentration for a pollutant 
from the incineration of sewage sludge at or beyond the property line of 
the site where the sewage sludge incinerator is located.
    (m) Sewage sludge feed rate is either the average daily amount of 
sewage sludge fired in all sewage sludge incinerators within the 
property line of the site where the sewage sludge incinerators are 
located for the number of days in a 365 day period that each sewage 
sludge incinerator operates, or the average daily design capacity for 
all sewage sludge incinerators within the property line of the site 
where the sewage sludge incinerators are located.
    (n) Sewage sludge incinerator is an enclosed device in which only 
sewage sludge and auxiliary fuel are fired.
    (o) Stack height is the difference between the elevation of the top 
of a sewage sludge incinerator stack and the elevation of the ground at 
the base of the stack when the difference is equal to or less than 65 
meters. When the difference is greater than 65 meters, stack height is 
the creditable stack height determined in accordance with 40 CFR 51.100 
(ii).

[[Page 851]]

    (p) Total hydrocarbons means the organic compounds in the exit gas 
from a sewage sludge incinerator stack measured using a flame ionization 
detection instrument referenced to propane.
    (q) Wet electrostatic precipitator is an air pollution control 
device that uses both electrical forces and water to remove pollutants 
in the exit gas from a sewage sludge incinerator stack.
    (r) Wet scrubber is an air pollution control device that uses water 
to remove pollutants in the exit gas from a sewage sludge incinerator 
stack.

[58 FR 9387, Feb. 19, 1993, as amended at 64 FR 42571, Aug. 4, 1999]