NR 440.315(6)(g) (g) To determine compliance with sub. (3) (a) 3., the owner or operator shall construct consecutive 3-minute averages for each steel production cycle. Compliance is achieved if no 3-minute average is more than 5%.

NR 440.315 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90; r. and recr. (5), Register, July, 1993, No. 451, eff. 8-1-93; am. (5) (c) 1., 2., Register, December, 1995, No. 480, eff. 1-1-96; correction in (2) made under s. 13.93 (2m) (b) 1., Stats., Register, November, 1999, No. 527; CR 06-109: am. (4) (c), (5) (d) and (6) (e) to (g) Register May 2008 No. 629, eff. 6-1-08.

NR 440.32 NR 440.32 Sewage treatment plants.

NR 440.32(1) (1) Applicability and designation of affected facility.

NR 440.32(1)(a) (a) The affected facility is each incinerator that combusts wastes containing more than 10% sewage sludge (dry basis) produced by municipal sewage treatment plants, or each incinerator that charges more than 1000 kg (2205 lb) per day municipal sewage sludge (dry basis).

NR 440.32(1)(b) (b) Any facility under par. (a) that commences construction or modification after June 11, 1973, is subject to the requirements of this section.

NR 440.32(2) (2) Definitions. As used in this section, terms have the meanings given in s. NR 440.02.

NR 440.32(3) (3) Standard for particulate matter.

NR 440.32(3)(a) (a) 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 of any sewage sludge incinerator subject to the provisions of this section may discharge or cause the discharge into the atmosphere of:

NR 440.32(3)(a)1. 1. Particulate matter at a rate in excess of 0.65 g/kg dry sludge input (1.30 lb/ton dry sludge input).

NR 440.32(3)(a)2. 2. Any gases which exhibit 20% opacity or greater.

NR 440.32(4) (4) Monitoring of operations.

NR 440.32(4)(a) (a) The owner or operator of any sludge incinerator subject to the provisions of this section shall:

NR 440.32(4)(a)1. 1. Install, calibrate, maintain, and operate a flow measuring device which can be used to determine either the mass or volume of sludge charged to the incinerator. The flow measuring device shall be certified by the manufacturer to have an accuracy of ± 5% over its operating range. Except as provided in par. (d), the flow measuring device shall be operated continuously and data recorded during all periods of operation of the incinerator.

NR 440.32(4)(a)2. 2. Provide access to the sludge charged so that a well-mixed representative grab sample of the sludge can be obtained.

NR 440.32(4)(a)3. 3. Install, calibrate, maintain and operate a weighing device for determining the mass of any municipal solid waste charged to the incinerator when sewage sludge and municipal solid waste are incinerated together. The weighing device shall have an accuracy of ± 5% over its operating range.

NR 440.32(4)(b) (b) The owner or operator of any multiple hearth, fluidized bed or electric sludge incinerator subject to the provisions of this section shall comply with the requirements of par. (a) and:

NR 440.32(4)(b)1. 1. For incinerators equipped with a wet scrubbing device, install calibrate, maintain and operate a monitoring device that continuously measures and records the pressure drop of the gas flow through the wet scrubbing device. Where a combination of wet scrubbers is used in series, the pressure drop of the gas flow through the combined system shall be continuously monitored. The device used to monitor scrubber pressure drop shall be certified by the manufacturer to be accurate within ±250 pascal (±1 inch water gauge) and shall be calibrated on an annual basis in accordance with the manufacturer’s instructions.

NR 440.32(4)(b)2. 2. Install, calibrate, maintain and operate a monitoring device that continuously measures and records the oxygen content of the incinerator exhaust gas. The oxygen monitoring shall be located upstream of any rabble shaft cooling air inlet into the incinerator exhaust gas stream, fan, ambient air recirculation damper, or any other source of dilution air. The oxygen monitoring device shall be certified by the manufacturer to have a relative accuracy of ±5% over its operating range and shall be calibrated according to method or methods prescribed by the manufacturer at least once each 24-hour operating period.

NR 440.32(4)(b)3. 3. Install, calibrate, maintain and operate temperature measuring devices at every hearth in multiple hearth furnaces; in the bed and outlet of fluidized bed incinerators; and in the drying, combustion and cooling zones of electric incinerators. For multiple hearth furnaces, a minimum of one temperature measuring device shall be installed in each hearth in the cooling and drying zones, and a minimum of 2 temperature measuring devices shall be installed in each hearth in the combustion zone. For electric incinerators, a minimum of one temperature measuring device shall be installed in the drying zone and one in the cooling zone, and a minimum of 2 temperature measuring devices shall be installed in the combustion zone. Each temperature measuring device shall be certified by the manufacturer to have an accuracy of + 5% over its operating range. Except as provided in par. (d), the temperature monitoring devices shall be operated continuously and data recorded during all periods of operation of the incinerator.

NR 440.32(4)(b)4. 4. Install, calibrate, maintain and operate a device for measuring the fuel flow to the incinerator. The flow measuring device shall be certified by the manufacturer to have an accuracy of ±5% over its operating range. Except as provided in par. (d), the fuel flow measuring device shall be operated continuously and data recorded during all periods of operation of the incinerator.

NR 440.32(4)(b)5. 5. Except as provided in par. (d), collect and analyze a grab sample of the sludge fed to the incinerator once per day. The dry sludge content and the volatile solids content of the sample shall be determined in accordance with the method specified under sub. (5) (b) 5., except that the determination of volatile solids, step 3.b. of the method, may not be deleted.

NR 440.32(4)(c) (c) The owner or operator of any multiple hearth, fluidized bed or electric sludge incinerator subject to the provisions of this section shall retain the following information and make it available for inspection by the department for a minimum of 2 years:

NR 440.32(4)(c)1. 1. For incinerators equipped with a wet scrubbing device, a record of the measured pressure drop of the gas flow through the wet scrubbing device, as required by par. (b) 1.

NR 440.32(4)(c)2. 2. A record of the measured oxygen content of the incinerator exhaust gas, as required by par. (b) 2.

NR 440.32(4)(c)3. 3. A record of the rate of sludge charged to the incinerator, the measured temperatures of the incinerator, the fuel flow to the incinerator, and the total solids and volatile solids content of the sludge charged to the incinerator, as required by pars. (a) 1. and (b) 3., 4. and 5.

NR 440.32(4)(d) (d) The owner or operator of any multiple hearth, fluidized bed, or electric sludge incinerator subject to the provisions of this section from which the particulate matter emission rate measured during the performance test required under sub. (5) (d) is less than or equal to 0.38 g/kg of dry sludge input (0.75 lb/ton) shall be required to comply with the requirements in pars. (a) to (c) during all periods of operation of this incinerator following the performance test except that:

NR 440.32(4)(d)1. 1. Continuous operation of the monitoring devices and data recorders in pars. (a) 1. and (b) 3. and 4. is not required.

NR 440.32(4)(d)2. 2. Daily sampling and analysis of sludge feed in par. (b) 5. is not required.