Tenn. Comp. R. & Regs. 1200-03-11-.04 - MERCURY

(1) Applicability. The provisions of this Rule are applicable to those air contaminant sources which process mercury ore to recover mercury, use mercury chlor-alkali cells to produce chlorine gas and alkali metal hydroxide, and incinerate or dry wastewater treatment plant sludge. Any facility subject to the provisions of 40 CFR 63, Subpart IIIII - National Emission Standards for Hazardous Air Pollutants: Mercury Emissions from Mercury Cell Chlor-Alkali Plants is not subject to this rule.
(2) Definitions: Terms used in this rule not defined herein shall have the meaning given to them in chapter 1200-03-2.
(a) ''Mercury'' means the element mercury, excluding any associated elements, and includes mercury in particulates, vapors, aerosols, and compounds.
(b) ''Mercury ore'' means a mineral mined specifically for its mercury content.
(c) ''Mercury ore processing facility'' means a facility processing mercury ore to obtain mercury.
(d) ''Condenser stack gases'' means the gaseous effluent evolved from the stack of processes utilizing heat to extract mercury metal from mercury ore.
(e) ''Mercury chlor-alkali cell'' means a device which is basically composed of an electrolyzer section and a denuder (decomposer) section and utilizes mercury to produce chlorine gas, hydrogen gas, and alkali metal hydroxide.
(f) ''Mercury chlor-alkali electrolyzer'' means a electrolytic device which is part of a mercury-chlor-alkali cell and utilizes a flowing mercury cathode to produce chlorine gas and alkali metal amalgam.
(g) ''Denuder'' means a horizontal or vertical container which is part of a mercury chlor-alkali cell in which water and alkali metal amalgam are converted to alkali metal hydroxide, mercury, and hydrogen gas in a short-circuited, electrolytic reaction.
(h) ''Hydrogen gas stream'' means a hydrogen stream formed in the chlor-alkali cell denuder.
(i) ''End box'' means a container(s) located on one or both ends of a mercury chlor-alkali electrolyzer which serves as a connection between the electrolyzer and denuder for rich and stripped amalgam.
(j) ''End box ventilation system'' means a ventilation system which collects mercury emissions from the end-boxes, the mercury pump sumps, and their water collection systems.
(k) ''Cell room'' means a structure(s) housing one or more mercury electrolytic chlor-alkali cells.
(l) ''Sludge'' means sludge produced by a treatment plant that processes municipal or industrial waste waters.
(m) ''Sludge dryer'' means a device used to reduce the moisture content of sludge by heating to temperatures above 65 C (ca. 150 F) directly with combustion gases.
(3) Emission Standards for Mercury
(a) Emissions to the atmosphere from mercury ore processing facilities and mercury cell chlor-alkali plants shall not exceed 2300 grams of mercury per 24-hour period.
(b) Emissions to the atmosphere from sludge incineration plants, sludge drying plants, or a combination of these that process waste-water treatment plant sludges shall not exceed 3200 grams of mercury per 24-hour period.
(4) Stack Sampling:
(a) Each owner or operator of a facility subject to an emission standard in paragraph (3) of this rule shall test emissions from his source as follows:
1. Within ninety (90) days of February 9, 1977. an existing source or a new source which has an initial startup date preceding February 9, 1977, or
2. Within ninety (90) days of startup in the case of a new source which did not have an initial startup date preceding February 9, 1977.
(b) The Technical Secretary shall be notified at least thirty (30) days prior to an emission test, so that he may at his option observe the test.
(c) Samples shall be taken over such period or periods as are necessary to accurately determine the maximum emissions which will occur in a twenty-four (24) hour period. No change in the operation shall be made, which would potentially increase emissions above that determined by the most recent source test, until the new emission level has been estimated by calculation and the results reported to the Technical Secretary.
(d) All samples shall be analyzed, and mercury emissions shall be determined within thirty (30) days after the source test. Each determination will be reported to the Technical Secretary by written notification by the close of the next business day following such determination.
(e) Records of emission test results and other data needed to determine total emissions shall be retained at the source and made available for inspection by the Technical Secretary for a minimum of two (2) years.
(f) Sources using mercury chlor-alkali cells may test cell room emissions by passing all cell room air in forced gas streams through a stack suitable for testing in accordance with the above subparagraphs or demonstrate compliance with subparagraph (g) of this paragraph assume ventilation emissions of 1,300 grams/day of mercury.
(g) An owner or operator may carry out approved designed, maintenance, and housekeeping practices. A list of approved design, maintenance, and housekeeping practices may be obtained from the Technical Secretary.
(h) Measurement of mercury.

Mercury shall be determined by the Reference Method as specified in Appendix B of the Federal Register, Volume 38, Number 66, April 6, 1973, or Volume 40, Number 199, October 14, 1975, or other techniques approved by the Technical Secretary.

(i) Emission monitoring.

Wastewater treatment plant sludge incinerator and drying plants. All such sources for which mercury emissions exceed 1600 g/day, demonstrated by either method referenced above, shall monitor mercury emissions at intervals of at least once per year by use of Method 105 of Appendix B, Federal Register, Volume 40, Number 199, October 14, 1975.

(5) Sludge Sampling
(a) As an alternative to the stack sampling requirements of paragraph 1200-03-11-.04(4) compliance with paragraph (3) of this rule may be demonstrated by use of Method 105 of Appendix B of the Federal Register, Volume 49, Number 178, September 12, 1984, and the procedures specified in this section.
(b) The Technical Secretary shall be notified at least 30 days prior to a sludge sampling test, so that he may at his option observe the test.
(c) The sludge shall be sampled according to Method 105 - Determination of Mercury in Wastewater Treatment Plant Sewage Sludges. A total of three composite samples shall be obtained within an operating period of 24 hours. When the 24-hour operating period is not continuous, the total sampling period shall not exceed 72 hours after the first grab sample is obtained. Samples shall not be exposed to any condition that may result in mercury contamination or loss.
(d) The maximum 24-hour period sludge incineration or drying rate shall be determined by use of a flow rate measurement device that can measure the mass rate of the sludge charged to the incinerator or dryer with an accuracy of plus or minus 5 percent over its operating range. Other methods of measuring sludge mass charging rates may be used if they have received prior approval by the Technical Secretary.
(e) The mercury emissions shall be determined by use of the following equation:

EHg = MQFsm(avg) 1000

Where:

EHg = Mercury emissions, g/day.

M = Mercury concentration of sludge on a dry solids basis, ug/g.

Q = Sludge charging rate, kg/day.

Fsm = Weight fraction of solids in the collected sludge after mixing.

(f) No changes in the operation of a plant shall be made after a sludge test has been conducted which would potentially increase emissions above the level determined by the most recent sludge test until the new emission level has been estimated by calculation and the results reported to the Technical Secretary.
(g) All sludge samples shall be analyzed for mercury content within 30 days after the sludge sample is collected. Each determination shall be reported to the Technical Secretary by a registered letter dispatched before the close of the next business day following such determination.
(h) Records of sludge sampling, charging rates determination, and other data needed to determine mercury content of wastewater treatment plant sludges shall be retained at the source and made available, for inspection by the Technical Secretary, for a minimum of 2 years.

Notes

Tenn. Comp. R. & Regs. 1200-03-11-.04
Original rule certified June 7, 1974. Amended effective February 9, 1977. Amended effective November 6, 1988. Amendment filed January 15, 2009; effective March 31, 2009.

Authority: T.C.A. ยงยง 4-5-202, 68-25-105, and 68-201-105.

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