Code of Maine Rules › 06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL › Chapter 124 - TOTAL REDUCED SULFUR CONTROL FROM KRAFT PULP MILLS › Section 096-124-2 - Definitions

Current through 2024-29, July 17, 2024
A.
Alternative TRS control
				system.
"Alternative TRS control system" means alternative technologies
				(such as an air stripper or scrubber) used to remove TRS compounds from
				wastewater, gas streams or condensates.
B.
Black liquor solids.
"Black
				liquor solids" means the dry weight of the solids, which enter the recovery
				furnace in the black liquor.
C.
Brownstock washer system.
"Brownstock washer system" means
				brownstock washers and associated equipment used to wash the pulp following the
				digester system and prior to the bleaching system or oxygen delignification
				system.
D.
Digester system.
"Digester system" means each continuous digester or each batch digester
				used for the chemical treatment of wood or non-wood fibers at a Kraft pulp
				mill. The digester system equipment includes associated flash tank(s), blow
				tank(s), blow heat recovery accumulator(s), relief gas condenser(s), and
				pre-hydrolysis units preceding the brownstock washer system.
E.
Evaporator system.
"Evaporator system" means all equipment associated with increasing the
				solids content and/or concentrating spent cooking liquor from the brownstock
				washer system including pre-evaporators, multi-effect evaporators,
				concentrators, and vacuum systems, as well as associated condensers, hotwells
				and any other equipment serving the same function as those previously
				listed.
F.
High volume, low
				concentration or HVLC collection system.
"High volume, low concentration
				or HVLC collection system" means a system which collects and conveys TRS gases
				to a control device from equipment that could include, but is not limited to,
				the brownstock washer systems, oxygen delignification systems, any tertiary
				digester flash tanks, and any miscellaneous sources requiring TRS to be
				controlled.
G.
Kraft pulp
				mill.
"Kraft pulp mill" means any stationary source which produces pulp
				from wood by cooking (digesting) wood chips in white liquor (a water solution
				of sodium hydroxide and sodium sulfide) at elevated temperature and pressure.
				Regeneration of the cooking chemicals through a recovery process is part of the
				Kraft pulp mill.
H.
Lime
				kiln.
"Lime kiln" means a unit used to calcine lime mud, a process which
				consists primarily of converting calcium carbonate into quicklime, which is
				calcium oxide.
I.
Low volume,
				high concentration or LVHC collection system.
"Low volume, high
				concentration or LVHC collection system" means a system which collects and
				conveys TRS gases to a control device from equipment that could include, but is
				not limited to, the digester system, turpentine recovery system, evaporator
				systems, and any miscellaneous sources requiring TRS to be
				controlled.
J.
Miscellaneous
				sources.
"Miscellaneous sources" means sources of TRS which are not
				controlled but emit TRS at levels greater than 0.75 pounds per hour on a
				continuous basis under normal operations. Continuous means occurring for more
				than a two (2)-hour period. Miscellaneous sources may include, but not be
				limited to, knotters, screens, deckers, oxygen delignification systems, liquor
				storage tanks and chip bins.
K.
Recovery furnace.
"Recovery furnace" means an enclosed combustion
				device where concentrated black liquor is burned to recover sodium and sulfur
				and to produce steam for energy recovery.
L.
Smelt dissolving tank.
"Smelt
				dissolving tank" means a vessel used for dissolving the smelt collected from
				the recovery furnace.
M.
Steam stripper collection system.
"Steam stripper collection
				system" means a system which collects TRS off-gas from a steam stripper
				(including associated stripper feed tanks, condensers, or heat exchangers) and
				conveys the TRS gases to a designated control device. The steam stripper
				collection system also includes all equipment associated with a methanol
				rectification process including rectifiers, condensers, decanters, and storage
				tanks.
N.
Total reduced
				sulfur (TRS).
"Total reduced sulfur (TRS)" means the sum of the sulfur
				compounds hydrogen sulfide, methyl mercaptan, dimethyl sulfide, and dimethyl
				disulfide, that are released during the Kraft pulping operation and measured by
				EPA Reference Method 16, 16A, or 16B in Appendix A of 40 CFR Part 60.
O.
Twelve (12)-hour block average.
"Twelve (12)-hour block average" means the discrete average of a twelve
				(12)-hour period from midnight to noon, and from noon to midnight or any other
				discrete twelve (12)-hour block average period approved by the Department for a
				particular source as specified in the source's air emission license.
P.
Venting of TRS.
"Venting of
				TRS" means the direct release of gases which contain TRS to the atmosphere in
				excess of 0.75 pounds per hour or five (5) ppm from any LVHC, HVLC, steam
				stripper collection system, or alternative TRS control system or associated
				equipment when such sources are in operation. Venting of TRS shall not include
				equipment leaks such as leaks around flanges, valves, and covers of quantities
				less than 0.1 lbs/hr.
Q.
Waste water treatment system.
"Waste water treatment system" means the
				system that treats process wastewater from the facility, which includes primary
				clarifiers, secondary clarifiers, polishing ponds, aeration lagoons and sludge
				press areas of the mill.
R.
Wet-bottom electrostatic precipitator (wet-bottom ESP).
"Wet-bottom
				electrostatic precipitator (wet-bottom ESP)" means an electrostatic
				precipitator where the particulate matter is removed from the bottom of the
				device with the use of black liquor.