(1) Applicability
The provisions of this rule shall apply to each triple
superphosphate 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 mixers, curing belts (dens), reactors, granulators, dryers,
cookers, screens, mills and facilities which store run-of-pile triple
superphosphate commenced on or after February 9, 1977.
(2) Definitions
(a) "Triple superphosphate plant" means any
facility manufacturing triple superphosphate by reacting phosphate rock with
phosphoric acid. A run-of-pile triple superphosphate plant includes curing and
storing.
(b) "Run-of-pile triple
superphosphate" means any triple phosphate that has not been processed in a
granulator and is composed on particles at least 25 percent by weight of which
(when not caked) will pass through a 16 mesh screen.
(c) "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.
(d) "Equivalent
P2O5 feed" means the quantity of
phosphorus, 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
100 g/metric ton of equivalent
P2O5 feed (0.20
lb/ton).
(4) Monitoring of
Operations. The owner or operator of any triple superphosphate 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 operating range.
(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.
(c) 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.
(5)
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
procedures.
(c) Equivalent
P
2O
5 feed shall be determined as
follows:
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
rule.
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.
(d) For each run, emissions expressed in
g/metric ton of equivalent P2O5 feed shall be determined when using the
following equation:
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where:
E = Emissions of total fluorides in g/metric ton of
equivalent feed.
Cs = Concentration of total fluorides in mg/dscm.
Qs = Volumetric flow rate of the effluent gas stream in
dscm/hr.
10-3 = Conversion factor for mg to
g.
MP2O5 =
Equivalent P2O5 feed in metric
ton/hr.
Notes
Tenn. Comp. R. &
Regs. 1200-03-16-.19
Original rule filed
January 10, 1977; effective February 9, 1977. Amendment filed September 21,
1988; effective November 6, 1988.
Authority: T.C.A. §§ 68-25-105 and
4-5-202.