Current through August 26, 2024
(1) APPLICABILITY
AND DESIGNATION OF AFFECTED FACILITY.
(a) The
affected facility to which the provisions of this section apply is each
superphosphoric acid plant having a design capacity of more than 15 tons of
equivalent P2O5 feed per calendar day. For the purpose of this section, the
affected facility includes any combination of: evaporators, hotwells, acid
sumps and cooling tanks.
(b) Any
facility under par. (a) that commences construction or modification after
October 22, 1974, is subject to the requirements of this section.
(2) DEFINITIONS. As used in this
section, terms not defined in this subsection have the meanings given in s.
NR 440.02.
(a)
"Equivalent P2O5 feed" means the quantity of phosphorus, expressed as
phosphorus pentoxide, fed to the process.
(b) "Superphosphoric acid plant'' means any
facility which concentrates wet-process phosphoric acid to 66% or greater P2O5
content by weight for eventual consumption as a fertilizer.
(c) "Total fluorides" means elemental
fluorine and all fluoride compounds as measured by reference methods specified
in sub. (5), or equivalent or alternative methods.
(3) STANDARD FOR FLUORIDES. On and after the
date on which the performance test required to be conducted by s.
NR 440.08 is
completed, no owner or operator subject to the provisions of this section may
cause to be discharged into the atmosphere from any affected facility any gases
which contain total fluorides in excess of 5.0 Mg/ton of equivalent P2O 5 feed
(0.010 lb/ton).
(4) MONITORING OF
OPERATIONS.
(a) The owner or operator of any
superphosphoric acid plant subject to the provisions of this section shall
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% over its
operating range.
(b) The owner or
operator of any superphosphoric acid plant shall maintain a daily record of
equivalent P2O5 feed by first determining the total mass rate in Mg/hr of
phosphorus-bearing feed using a flow monitoring device meeting the requirements
of par. (a) and then proceeding according to sub. (5) (b) 3.
(c) The owner or operator of any
superphosphoric acid plant subject to the provisions of this section shall
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% over its
operating range.
(5) TEST
METHODS AND PROCEDURES.
(a) In conducting the
performance tests required in s.
NR 440.08, the
owner or operator shall use as reference methods and procedures the test
methods in Appendix A of 40 CFR part 60, incorporated by reference in s.
NR 440.17, or other methods and procedures as specified
in this subsection, except as provided in s.
NR 440.08(2).
(b) The owner or operator shall determine
compliance with the total fluorides standard in sub. (3) as follows:
1. The emission rate (E) of total fluorides
shall be computed for each run using the following equation:
See
PDF for diagram
where:
E is the emission rate of total fluorides, g/Mg (lb/ton)
of equivalent P2O5 feed
Csi is the concentration of total fluorides from emission
point "i", mg/dscm (gr/dscf)
Qsdi is the volumetric flow rate of effluent gas from
emission point "i", dscm/hr (dscf/hr)
N is the number of emission points associated with the
affected facility
P is the equivalent P2O5 feed rate, Mg/hr (ton/hr)
K is the conversion factor, 1000 mg/g (7000 gr/lb)
2. Method 13A or 13B shall be used
to determine the total fluorides concentration (Csi) and volumetric flow rate
(Qsdi) of the effluent gas from each of the emission points. The sampling shall
be at least 60 minutes and 0.85 dscm (30 dscf).
3. The equivalent P2O5 feed rate (P) shall be
computed for each run using the following equation:
See
PDF for diagram
where:
Mp is the total mass flow rate of phosphorus-bearing feed,
Mg/hr (ton/hr)
Rp is the P2O5 content, decimal fraction
a. The accountability system of sub. (4) (a)
shall be used to determine the mass flow rate (Mp) of the phosphorus-bearing
feed.
b. The Association of
Official Analytical Chemists (AOAC) Method 9, incorporated by reference in s.
NR 440.17, shall be used to determine the P2O5 content
(Rp) of the feed.
