NORTH COAST UNIFIED AIR QUALITY MANAGEMENT DISTRICT

SECTION 4

MEDICAL WASTE INCINERATORS


RULE 4-400 - CONTROL MEASURE FOR EMISSIONS OF DIOXINS FROM MEDICAL WASTE INCINERATORS

  1. No person shall dispose of medical wastes by burning except in a medical waste incinerator which meets the requirements of this regulation, and which has been reviewed by the air pollution control officer and received a written permit to operate in accordance with this and other regulations of the District.

  2. No person shall operate a category III medical waste incinerator unless either condition (1) or (2) is met.
    1. Emissions of dioxins have been reduced to less than 1 percent of the uncontrolled emissions; or

    2. Emissions of dioxins are less than 10 nanograms per kilogram of waste burned.

  3. No person shall operate a category III medical waste incinerator unless control equipment is installed and used in a manner which has been demonstrated to and approved by the Air Pollution Control Officer to meet all of the following conditions:
  1. The temperature of the flue gas at the outlet of the control equipment shall not exceed 300 degrees Fahrenheit, unless it has been demonstrated to and approved in writing by the Air Pollution Control Officer and the ARB that lower emission rates are achieved at a higher outlet temperature; and

  2. The operating temperature of any single-chamber incinerator shall be maintained at not less than 1800 degrees Fahrenheit.

  3. The temperature of the primary combustion chamber of any multiple-chamber incinerator shall be maintained at not less than 1400 degrees Fahrenheit, and the temperature of the secondary combustion chamber shall be maintained at not less than 1800 degrees Fahrenheit.

  4. The design of any incinerator shall provide that the residence time of the combustion gases in the combustion chamber of a single-chamber incinerator or in the secondary combustion chamber of a multiple-chamber incinerator shall be at least one second. Residence time shall be calculated using Equation 1.


Residence Time = V (Eqn. 1)
    Qc  

where
V is the volume, expressed in cubic feet, of that portion of the incinerator from the point where the maximum temperature has been reached to the point where the temperature has dropped to 1600 degrees Fahrenheit.
Qc is the flow rate of combustion gas through the combustion chamber, expressed in actual cubic feet per second, and determined using ARB Test Method 2, or calculated using Equation 2.
Qc = Qstoi X (1 + EA) X

(Tc + 460)

 X 1 minute (Eqn. 2)
          100  

528

   60 seconds  
and where
EA is the excess air, expressed as a percentage of the air necessary for complete combustion.
Tc is the maximum temperature, in degrees Fahrenheit, reached in the incinerator
SCF O2

Qstoi is the amount of air theoretically required for complete combustion, expressed in standard cubic feet per minute (SCF) and calculated as follows:
Qstoi = lb-mole O2 X lb-waste X SCF O2 X SCF air
    lb-waste   min   lb-mole O2   SCF O2