The provisions of this rule shall apply to each granular
diammonium phosphate plant having a design capacity of more than 15 tons of
equivalent P2O5 feed per calendar
day. For the purpose of this rule, the affected facility includes any
combination of reactors, granulators, dryers, coolers, screens and mills
commenced on or after February 9, 1977.
(a) "Granular diammonium phosphate plant"
means any plant manufacturing granular diammonium phosphate by reacting
phosphoric acid with ammonia.
"Total fluorides" means elemental fluorine and all fluoride compounds as
measured by reference methods specified in subparagraph .01(5)(g) of this
chapter or equivalent or alternative methods.
P2O5 feed" means the quantity of
phosphorous, expressed as phosphorous pentoxide, fed to the process.
(3) Standard for Fluorides. On and
after the date on which the performance test required to be conducted by
paragraph .01(5) of this chapter is completed, no owner or operator subject to
the provisions of this rule shall cause to be discharged into the atmosphere
from any affected facility any gases which contain total fluorides in excess of
30 g/metric ton of equivalent P2O5
feed (0.060 lb/ton).
Monitoring of operations. The owner or
operator of any granular diammonium phosphate plant subject to the provisions
of this rule shall:
(a) Install, calibrate,
maintain and operate a flow monitoring device which can be used to determine
the mass flow of phosphorus-bearing feed material to the process. The flow
monitoring device shall have an accuracy of ±5 percent over its
(b) Maintain a
daily record of equivalent P2O5
feed by first determining the total mass rate in metric ton/hr of
phosphorus-bearing feed using a flow monitoring device meeting the requirements
of subparagraph (a) of this paragraph and then by proceeding according to part
(5)(c) 2. of this rule.
Install, calibrate, maintain and operate a monitoring device which continuously
measures and permanently records the total pressure drop across the process
scrubbing system. The monitoring device shall have an accuracy of ±5
percent over its operating range.
Test Methods and Procedures.
(a) For determining the concentration of
total fluorides and the associated moisture content, the sampling time for each
run shall be at least 60 minutes and the minimum sample volume shall be at
least 0.85 dscm (30 dscf) except that shorter sampling times or smaller
volumes, when necessitated by process variables or other factors, may be
approved by the Technical Secretary.
(b) The air pollution control system for the
affected facility shall be constructed so that volumetric flow rates and total
fluoride emissions can be accurately determined by applicable test methods and
feed shall be determined as
1. Determine the total mass rate in
metric ton/hr of phosphorus-bearing feed during each run using a flow
monitoring device meeting the requirements of subparagraph (4)(a) of this
2. Calculate the equivalent
P2O5 feed by multiplying the
percentage P2O5 content, as
measured by the spectrophotometric molybdovanadophosphate method (AOAC Method
9), times the total mass rate of phosphorus-bearing feed. AOAC Method 9 is
published in the Official Methods of Analysis of the Association of Official
Analytical Chemists, 11th edition, 1970, pp. 11-12. Other methods may be
approved by the Technical Secretary.
For each run, emissions expressed in
g/metric ton of equivalent P2
feed shall be determined using the following equation:
to view Image
E = Emissions of total fluorides in g/metric ton of
equivalent P2O5 feed.
Cs = Concentration of total fluorides in mg/dscm.
Qs = Volumetric flow rate of the effluent gas stream in
10-3 = Conversion factor for mg to
Equivalent P2O5 feed in metric
Tenn. Comp. R. &
Original rule filed
January 10, 1977; effective February 9, 1977. Amendment filed May 17, 1978;
effective June 16, 1978. Amendment filed September 21, 1988; effective November
Authority: T.C.A. §§ 68-25-105 and