Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 5 - STATE AIR POLLUTION CONTROL BOARD › Chapter 40 - EXISTING STATIONARY SOURCES › Part II - Emission Standards › Article 13 - Emission Standards for Pulp and Paper Mills (Rule 4-13) › Section 9VAC5-40-1670 - Definitions

Current through Register Vol. 40, No. 24, July 15, 2024
A. For the purpose
					 of these regulations and subsequent amendments or any orders issued by the
					 board, the words or terms shall have the meanings given them in subsection C of
					 this section.
B. As used in this
					 article, all terms not defined here shall have the meanings given them in 9VAC5
					 Chapter 10 (9VAC5-10-10 et seq.), unless
					 otherwise required by context.
C.
					 Terms defined.
"Black liquor solids" means the dry weight of the solids
						which enter the recovery furnace in the black liquor.
"Condensate stripper system" means a column, and
						associated condensers, used to strip, with air or steam, total reduced sulfur
						compounds from condensate streams from various processes within a kraft pulp
						mill.
"Cross recovery furnace" means a furnace used to recover
						chemicals consisting primarily of sodium and sulfur compounds by burning black
						liquor which on a quarterly basis contains more than 7.0% by weight of the
						total pulp solids from the neutral sulfite or other semichemical process and
						has a green liquor sulfidity of more than 28%.
"Digester system" means each continuous digester or each
						batch digester used for the cooking of wood in white liquor, and associated
						flash tanks, below tanks, chip steamers, and condensers.
"Green liquor sulfidity" means the sulfidity of the
						liquor which leaves the smelt dissolving tank.
"Kraft pulp mill" means any facility which produces pulp
						from wood by cooking (digesting) wood chips in a water solution of sodium
						hydroxide and sodium sulfide (white liquor) at high temperature and pressure.
						Regeneration of the cooking chemicals through a recovery process is also
						considered part of the kraft pulp mill.
"Lime kiln" means a unit used to calcine lime mud, which
						consists primarily of calcium carbonate, into quicklime, which is calcium
						oxide.
"Multiple-effect evaporator system" means the
						multiple-effect evaporators and associated condensers and hotwells used to
						concentrate the spent cooking liquid that is separated from the pulp (black
						liquor).
"Neutral sulfite semichemical pulping operation" means
						any operation in which pulp is produced from wood by cooking (digesting) wood
						chips in a solution of sodium sulfite and sodium bicarbonate, followed by
						mechanical defibrating (grinding).
"New design recovery furnace" means a straight kraft
						recovery furnace that has both membrane wall or welded wall construction and
						emission control designed air systems. A new design furnace shall have stated
						in its contract a TRS performance guarantee or that it was designed with air
						pollution control as an objective.
"Old design recovery furnace" means a straight kraft
						recovery furnace that does not have membrane wall or welded wall construction
						or emission control designed air systems.
"Pulp and paper mill" means any kraft pulp mill or any
						paper mill using a semichemical pulping process.
"Recovery furnace" means either a straight kraft
						recovery furnace or a cross recovery furnace, and includes the direct-contact
						evaporator for a direct-contact furnace.
"Semichemical pulping process" means any pulp
						manufacturing process in which the active chemicals of the liquor used in
						cooking (digesting) wood chips to their component parts in a pressurized vessel
						(digester) are primarily a liquor of sodium hydroxide and sodium carbonate. The
						major difference between all semichemical techniques and those of kraft and
						acid sulfite processes is that only a portion of the lignin is removed during
						the cooking (digesting), after which the pulp is further reduced by mechanical
						disintegration.
"Smelt dissolving tank" means a vessel used for
						dissolving the smelt collected from the recovery furnace.
"Straight kraft recovery furnace" means a furnace used
						to recover chemicals consisting primarily of sodium and sulfur compounds by
						burning black liquor which on a quarterly basis contains 7.0% by weight or less
						of the total pulp solids from the neutral sulfite or other semichemical process
						or has green liquor sulfidity of 28% or less.
"Total reduced sulfur" or "TRS" means the sum of the
						following sulfur compounds (hydrogen sulfide, methyl mercaptan, dimethyl
						sulfide and dimethyl disulfide, reported as hydrogen sulfide) that are released
						during any kraft wood pulping operation.
"Twenty-four hour average" means the average of data
						over a 24-hour period beginning at midnight.
Statutory Authority
§ 10.1-1308 of the Code of Virginia.