Chapter NR 446

Q is the sludge charging rate, kg/day

Fsm(avg) is the average weight fraction of solids in the collected sludge after mixing

1000 is the conversion factor, kg mg/g2

NR 446.21(4)(f)5. 5. No changes in the operation of a plant may 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 emissions level has been estimated by calculation and the results reported to the department.

NR 446.21(4)(f)6. 6. 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 department by registered letter dispatched before the close of the next business day following the determination.

NR 446.21(4)(f)7. 7. Records of sludge sampling, charging rate 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 a department representative for a minimum of 2 years.

NR 446.21 History History: Renum. from NR 154.19 (3) (b), and am., Register, September, 1986, No. 369, eff. 10-1-86; am. (1) (b), (2) (b), (3) (c) and (4) (b), Register, May, 1992, No. 437, eff. 6-1-92; am. (1) (a), (2) (a), (3) (b) and (d) and (4) (a), (f) (intro.), 3. and 4., Register, May, 1994, No. 461, eff. 6-1-94; CR 01-081: renum. from NR 446.04 Register September 2004 No. 585, eff. 10-1-04; CR 07-036: renum. from NR 446.15, am. (3) (a) Register November 2008 No. 635, eff. 12-1-08.

NR 446.22 NR 446.22 Monitoring of emissions and operations.

NR 446.22(1) (1) All wastewater treatment plant sludge incineration and drying plants for which mercury emissions exceed 1.6 kg (3.5 lbs) per 24-hour period, demonstrated either by stack sampling or sludge sampling according to s. NR 446.21 (4), shall monitor mercury emissions at intervals of at least once per year in accordance with Method 105 and the procedures specified in s. NR 446.21 (4) (f). The results of monitoring shall be reported to the department by registered letter dispatched before the close of the next business day following the monitoring. The results shall be retained at the source and shall be made available for inspection by a department representative for a minimum of 2 years.

NR 446.22(2) (2) The owner or operator of each mercury cell chlor-alkali plant—hydrogen and end-box ventilation gas streams shall:

NR 446.22(2)(a) (a) Perform a mercury emission test that demonstrates compliance with the emission limits in s. NR 446.20 (1) on the hydrogen stream by Method 102 and on the end-box stream by Method 101 for the purpose of establishing limits for parameters to be monitored, within one year after June 1, 1994 or within one year of startup for a plant with initial startup after February 1, 1984.

NR 446.22(2)(b) (b) Monitor and record manually or automatically at least once every 15 minutes during the tests specified in par. (a) all of the following control device parameters, except as provided in par. (c):

NR 446.22(2)(b)1. 1. The exit gas temperature from uncontrolled streams.

NR 446.22(2)(b)2. 2. The outlet temperature of the gas stream for the final cooling system when no control devices other than coolers and demisters are used.

NR 446.22(2)(b)3. 3. The outlet temperature of the gas stream from the final cooling system when the cooling system is followed by a molecular sieve or carbon adsorber.

NR 446.22(2)(b)4. 4. Outlet concentration of available chlorine, pH, liquid flow rate and inlet gas temperature of chlorinated brine scrubbers and hypochlorite scrubbers.

NR 446.22(2)(b)5. 5. The liquid flow rate and exit gas temperature for water scrubber.

NR 446.22(2)(b)6. 6. The inlet gas temperature of carbon adsorption systems.

NR 446.22(2)(b)7. 7. The temperature during the heating phase of the regeneration cycle for carbon adsorbers or molecular sieves.

NR 446.22(2)(c) (c) Average the parameters recorded in par. (b) over a minimum 6 hour test period. The highest temperature reading that is measured in par. (b) 7. is to be identified as the reference temperature for use in par. (f) 2.

NR 446.22(2)(d) (d) Monitor and record manually or automatically immediately after the completion of the emission tests specified in par. (a) the following:

NR 446.22(2)(d)1. 1. The parameters specified in par. (b) 1. to 6. at least once per hour.

NR 446.22(2)(d)2. 2. The temperature specified in par. (b) 7. during each heating phase of the regeneration cycle.

NR 446.22(2)(e) (e) Operate, maintain and calibrate monitoring devices according to the manufacturer’s instructions. Monitoring devices used in accordance with pars. (b) and (d) shall be certified by their manufacturer to be accurate to within 10%. Records of the certifications and calibrations shall be retained at the chlor-alkali plant and made available for inspection by the department as follows: certification, for as long as the device is used for this purpose; and calibration, for a minimum of 2 years.

NR 446.22(2)(f) (f) Notify the department within 10 days when:

NR 446.22(2)(f)1. 1. The hourly value of a parameter monitored in accordance with par. (d) 1. exceeds, or, in the case of liquid flow rate and available chlorine, falls below, the value of that same parameter determined in par. (b) for 24 consecutive hours, and

NR 446.22(2)(f)2. 2. The maximum hourly value of the temperature measured in accordance with par. (d) 2. is below the reference temperature recorded according to par. (c) for 3 consecutive regeneration cycles.

NR 446.22(2)(g) (g) Submit semiannual reports to the department indicating the time and date on which the hourly value of each parameter monitored according to par. (d) 1. and 2. fell outside the value of that same parameter determined under par. (c) and corrective action taken, and the time and date of the corrective action. Parameter excursions shall be considered unacceptable operation and maintenance of the emission control system. In addition, while compliance with the emission limits is determined primarily by conducting a performance test according to the procedures in s. NR 446.21 (2), reports of parameter excursions may be used as evidence in judging the duration of a violation that is determined by a performance test.

NR 446.22(2)(h) (h) Submit semiannual reports required in par. (g) to the department on September 15 and March 15 of each year. The first semiannual report is to be submitted following the first full 6 month reporting period. The semiannual reports due on September 15 and March 15 shall include all excursions monitored during the 6 calendar months previous to the report date.

NR 446.22(3) (3) The owner or operator of a facility subject to sub. (2) may develop and submit for the department’s approval a plant-specific monitoring plan as an alternative to the monitoring, recordkeeping and reporting requirements of sub. (2) (a) to (g). Approval of an alternative plan shall ensure compliance with the emission limits of s. NR 446.20 (1), and proper operation and maintenance of emissions control systems. Any site-specific monitoring plan shall, at a minimum, include all of the following:

NR 446.22(3)(a) (a) Identification of the critical parameter or parameters for the hydrogen stream and for the end-box ventilation stream that are to be monitored and an explanation of why the critical parameters selected are the best indicators of proper control system performance and of mercury emission rates.

NR 446.22(3)(b) (b) Identification of the maximum or minimum value of each parameter that is not to be exceeded. The levels shall be directly correlated to the results of a performance test, conducted no more than 180 days prior to submittal of the plan, when the facility was in compliance with the emission limits of s. NR 446.20 (1).

NR 446.22(3)(c) (c) Designation of the frequency for recording the parameter measurements, with justification if the frequency is less than hourly. A longer recording frequency shall be justified on the basis of the amount of time that could elapse during periods of process or control system upsets before the emission limits would be exceeded, and consideration is to be given to the time that would be necessary to repair the failure.

NR 446.22(3)(d) (d) Designation of the immediate actions to be taken in the event of an excursion beyond the value of the parameter established in par. (b).

NR 446.22(3)(e) (e) Provisions for reporting, semiannually, parameter excursions and the corrective actions taken, and provisions for reporting within 10 days any significant excursion.

NR 446.22(3)(f) (f) Identification of the accuracy of the monitoring devices or of the readings obtained.

NR 446.22(3)(g) (g) Recordkeeping requirements for certifications and calibrations.

NR 446.22 Note Note: The owner or operator of a mercury cell chlor-alkali plant, cell room ventilation system determining cell room emissions, shall maintain records of any leak or spill of mercury. The records shall indicate the amount, location, time and date when the leak or spill occurred, identify the cause of the leak or spill, state the immediate steps taken to minimize mercury emissions and steps taken to prevent future occurrences and provide the time and date on which corrective steps were taken. The results of monitoring shall be recorded, retained at the source and made available for inspection by the administrator for a minimum of 2 years.

NR 446.22 History History: Renum. from NR 154.19 (3) (c), and am., Register, September, 1986, No. 369, eff. 10-1-86; renum. 446.05 to be (1), cr. (2) and (3), Register, May, 1994, No. 461, eff. 6-1-94; am. (2) (a), (3) (intro.) and (b), Register, November, 1999, No. 527, eff. 12-1-99; CR 01-081: renum. from NR 446.05 Register September 2004 No. 585, eff. 10-1-04; CR 07-036: renum. from NR 446.16, am. (1), (2) (a), (g), (3) (intro.) and (b) Register November 2008 No. 635, eff. 12-1-08.