Section NR 440.40 - Phosphate fertilizer industry: triple superphosphate plants(1) APPLICABILITY AND DESIGNATION OF AFFECTED FACILITY.(a) The affected facility to which the provisions of this section apply is 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 section, the affected facility includes any combination of: mixers, curing belts or dens, reactors, granulators, dryers, cookers, screens, mills and facilities which store run-of-pile triple superphosphate.(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) "Run-of-pile triple superphosphate" means any triple superphosphate that has not been processed in a granulator and is composed of particles at least 25% 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 sub. (5), or equivalent or alternative methods.(d) "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.(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 100 g/Mg of equivalent P2O 5 feed (0.20 lb/ton).(4) MONITORING OF OPERATIONS. (a) The owner or operator of any triple superphosphate 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 triple superphosphate 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 by proceeding according to sub. (5) (b) 3. (c) The owner or operator of any triple superphosphate 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, Mghr (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.Wis. Admin. Code Department of Natural Resources NR 440.40
Cr. Register, January, 1984, No. 337, eff. 2-1-84; am. (2) (intro.), Register, September, 1990, No. 417, eff. 10-1-90; am (2) (intro.) and (4) (b), r. and recr. (5), Register, July, 1993, No. 451, eff. 8-1-93; CR 06-109: renum. (3) (a) to be (3) and am., am. (4) (b) and (5) (b) 1. and 3. (intro.) Register May 2008 No. 629, eff. 6-1-08.