Md. Code Regs. 26.11.14.01

Current through Register Vol. 51, No. 22, November 1, 2024

Section 26.11.14.01 - Definitions

A. In this chapter, the following terms have the meanings indicated.

B. Terms Defined.

(1) "Brown stock washer" means an installation that removes spent cooking liquor from raw pulp to maximize chemical recovery and minimize carry over of cooking liquor into the bleaching plant.

(2) "Black liquor" means a combination of spent "cooking liquor" (water solution of sodium sulfate and sodium hydroxide) and pulp wash water containing dissolved wood compounds which is the byproduct of cooking wood chips at an elevated temperature and pressure.

(3) "Clean condensates" means all condensates from the pulp mill and evaporators that are not specifically identified in the definition of "foul condensates," including the condensates which have been processed through a condensate stripper to remove 90 percent or more of the VOC contaminants.

(4) "Combusted" means burned in a boiler or thermal oxidizer with a minimal temperature of 1,200°F and a residence time not less than 0.5 seconds or in a flare.

(5) "Condensate" means condensed process steam from the digester and evaporator areas that contain VOCs and other process chemicals, including both foul and clean condensates.

(6) "Condensate steam stripper" means a multi-stage distillation unit that uses steam to remove organics and TRS compounds from process condensate streams.

(7) "Digester" means an installation that uses cooking chemicals and heat to separate fiber from other organics in wood chips.

(8) "Digester blow tank system" means all the process equipment, including accumulators and condensers, used to separate the cooked pulp and spent cooking liquor from non-condensable gases and condensates.

(8-1) "Evaporator" means equipment that is used primarily to increase the solids content of spent cooking liquor from the pulp washing systems.

(9) "Foul condensates" means condensed process steam from the digester blow tank systems and the primary and secondary condensates generated from the evaporator effect when liquor is introduced.

(10) "Knotters" means a mechanical device used to separate uncooked knots from the pulp and spent cooking liquor mixture prior to brownstock washing.

(11) "Kraft pulp mill" means a group of installations which use an alkaline sulfide solution containing sodium hydroxide and sodium sulfide for a cooking liquor in its wood pulping process.

(12) "Oven-dried pulp (ODP)" means oven-dried, unbleached kraft pulp.

(12-1) "Recovery boiler" means an enclosed combustion device in which concentrated spent liquor is burned to:

(a) Recover sodium and sulfides;

(b) Dispose of unwanted dissolved wood components; and

(c) Generate steam.

(13) "Smelt dissolving tank" means an installation that processes the fluid discharge from a recovery boiler.

(14) "Total reduced sulfur (TRS)" means any compound of sulfur in a reduced state discharged from a kraft pulp mill consisting primarily of hydrogen sulfide, methyl mercaptan, dimethyl sulfide, and dimethyl disulfide.

Md. Code Regs. 26.11.14.01

Regulation .01 amended effective January 8, 2001 (27:26 Md. R. 2359); October 15, 2001 (28:20 Md. R. 1783)