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Subpart W

— Standards of Performance for the Phosphate Fertilizer Industry: Triple Superphosphate Plants

Contents §60.230 Applicability and designation of affected facility. §60.231 Definitions. §60.232 Standard for fluorides. §60.233 Monitoring of operations. §60.234 Test methods and procedures.

§60.230 Applicability and designation of affected facility. (a) The affected facility to which the provisions of this subpart apply is each triple superphosphate plant having a design capacity of more than 1 5 tons of equivalent P 2 O 5 feed per calendar day. For the purpose of this subpart, the affected facility includes any combination of: mixers, curing belts (dens), reactors, granulators, dryers, cookers coo l ers , screens, mills, and facilities which store run - of

- pile triple superphosphate. (b) Any facility under paragraph (a) of this section that commences construction or modification after October 22, 1974, is subject to the requirements of this subpart. §60.231 Definitions. As used in this subpart, all te rms not defined herein shall have the meaning given them in the Act and in subpart A of this part.P age 2 of 7

(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 superphosphate that has not been processed in a granulator and is composed of 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 §60.234, or equivalent or alternative methods. (d) Equivalent P 2 O 5 feed means the quantity of phosphorus, expressed as phosphorus pentoxide, fed to the process. §60.232 Standard for fluorides. On and after the date on which the performance test required to be conducted by §60.8 is completed, no owner or operator subject to the provisions of this subpart shall cause to be discharged into the atmosphere from any affected facility any gases which contain total fluorides in excess of 100 g/megagram (Mg) of equivalent P 2 O 5 feed (0.20 lb/ton). §60.233 Monitoring of operations. (a) The owner or operator of any triple superphosphate plant subject to the provisions of this subpart shall install, calibrate, maintain, and operate a flow monitoring device whichP age 3 of 7

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) The owner or operator of any triple superphosphate plant shall maintain a daily record of equivalent P 2 O 5 feed by first determining the total mass r ate in Mg/hr of phosphorus

bearing feed using a flow monitoring device meeting the requirements of paragraph (a) of this section and then by proceeding according to §60.234(b)(3). (c) Except as specified in paragraph (d) of this section,

t T he owner or ope rator of any triple superphosphate plant subject to the provisions of this part shall install, calibrate, maintain, and operate a monitoring device which continuously measures and permanently records the total pressure drop across

the process scrubbing sys tem adsorber . The monitoring device shall have an accuracy of ±5 percent over its operating range. (d) A ny facility under § 60.2 30 ( a ) that commences construction, modification, or reconstruction after [ date of publication of the final rule in the F ederal R egister ] is subject to the requirements of this paragraph instead of the requirements in paragraph (c) of this section

. If an absorber is used to comply with § 6 0

. 232, then the owner or operator shall continuously monitor pressure drop through the absorber and meetP age 4 of 7

the requirements specified in paragraphs (d) ( 1 ) through (d) ( 4 ) of this section. (1) The owner or operator shall i nstall, calibrate, maintain, and operate a continuous monitoring system (CMS) that continuously measures and permanently records the pressure at the gas stream inlet and outlet of the absorber. T he pressure at the gas stream inlet of the absorber may be measured using amperage on the blower if a correlation between pressure and amperage is established

. (2) The CMS must have an accuracy of ± 5 percent over the normal range measured or 0.12 kilopascals (0.5 inches of water column), whichever is greater. (3) The owner or operator shall establish an allowable range for the pressure drop through the absorber. The allowable range is ±20 percent of the arithmetic average of the three test runs conducted during the performance test required in § 60.8. The Administrator retains the right to reduce the ±20 percent adjustment to the baseline average values of operati ng ranges in those instances where performance test results indicate that a source's level of emissions is near the value of an applicable emissions standard

. However, the adjustment must not be reduced to less than ±10 percent under any instance. (4) The owner or operator shall demonstrate continuous compliance by maintaining the daily average pressure dropP age 5 of 7

through the absorber to within the allowable range established in paragraph (d)(3) of this section. The daily average pressure drop through the absorbe r for each operating day shall be

calculated using the data recorded by the monitoring system. If the emissions unit operation is continuous, the operating day is

a 24

- hour period. If the emissions unit operation is not continuous, the operating day is the total number of hours of control device operation per 24

- hour period. Valid data points must be available for 75 percent of the operating hours in an operating day to compute the daily average. §60.234 Test methods and procedures. (a) In conducting the pe rformance tests required in §60.8, the owner or operator shall use as reference methods and procedures the test methods in appendix A of this part or other methods and procedures as specified in this section, except as provided in §60.8(b). (b) The owner o r operator shall determine compliance with the total fluorides standards in §60.232 as follows: (1) The emission rate (E) of total fluorides shall be computed for each run using the following equation:

where:

E = emission rate of total fluorides, g/Mg (l b/ton) of

equivalent P 2 O 5 feed.P age 6 of 7

C si = concentration of total fluorides from emission point

“i,” mg/dscm (gr/dscf). Q sdi = volumetric flow rate of effluent gas from emission

point “i,” dscm/hr (dscf/hr). N = number of emission points in the affected facility. P = equivalent P 2 O 5 feed rate, Mg/hr (ton/hr). K = conversion factor, 1000 mg/g (7,000 gr/lb). (2) Method 13A or 13b shall be used to determine the total fluorides concentration (C si ) and volumetric flow rate (Q sdi ) of the effluent gas from each of the emission points. The sampling time and sample volume for each run shall be at least 60 minutes and 0.85 dscm (30 dscf). (3) The equivalent P 2 O 5 feed rate (P) shall be computed for each run using the following equation:

P = M p R p where:

M p = total mass flow rate of phosphorus

- bearing feed,

Mg/hr (ton/hr). R p = P 2 O 5 content, decimal fraction. (i) The accountability system of §60.233(a) shall be used to determine the mass flow rate (M p ) of the phosphorus

- bearing

feed. (ii) The Association of Official Analytical Chemists (AOAC) Method 9 (incorporated by reference

— see §60.17) shall be used to

determine the P 2 O 5 content (R p ) of the feed. § 60.235 Recordkeeping.P age 7 of 7

Any facility under § 60.230(a) that commences construction, modification, or reconstru ction after [ date of publication of the final rule in the Federal Register ] is subject to the requirements of this section. You must maintain the records identified as specified in § 60.7(f) and in paragraphs (a) and (b) of this section. All records required by this subpart must be maintained onsite for at least 5 years. (a) Records of the daily average pressure drop through the

absorber. (b) Records of deviations. A deviation is determined to have occurred when the monitoring data or lack of monitori ng data result in any one of the criteria specified in paragraphs (b)(1) and (b)(2) of this section being met. (1) A deviation occurs when the daily average value of a monitored operating parameter is less than the minimum pressure drop, or greater than th e maximum pressure drop established in § 60.233(d)(3). (2) A deviation occurs when the monitoring data are not available for at least 75 percent of the operating hours in a day.