[Code of Federal Regulations]

[Title 40, Volume 8]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR61.51]



[Page 47-48]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 61_NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS--Table 

of Contents

 

            Subpart E_National Emission Standard for Mercury

 

Sec.  61.51  Definitions.



    Terms used in this subpart are defined in the act, in subpart A of 

this part, or in this section as follows:

    (a) Mercury means the element mercury, excluding any associated 

elements, and includes mercury in particulates, vapors, aerosols, and 

compounds.

    (b) Mercury ore means a mineral mined specifically for its mercury 

content.

    (c) Mercury ore processing facility means a facility processing 

mercury ore to obtain mercury.

    (d) Condenser stack gases mean the gaseous effluent evolved from the 

stack of processes utilizing heat to extract mercury metal from mercury 

ore.

    (e) Mercury chlor-alkali cell means a device which is basically 

composed of an electrolyzer section and a denuder (decomposer) section 

and utilizes mercury to produce chlorine gas, hydrogen gas, and alkali 

metal hydroxide.

    (f) Mercury chlor-alkali electrolyzer means an electrolytic device 

which is part of a mercury chlor-alkali cell and utilizes a flowing 

mercury cathode to produce chlorine gas and alkali metal amalgam.

    (g) Denuder means a horizontal or vertical container which is part 

of a mercury chlor-alkali cell and in which water and alkali metal 

amalgam are converted to alkali metal hydroxide, mercury, and hydrogen 

gas in a short-circuited, electrolytic reaction.

    (h) Hydrogen gas stream means a hydrogen stream formed in the chlor-

alkali cell denuder.

    (i) End box means a container(s) located on one or both ends of a 

mercury chlor-alkali electrolyzer which serves as a connection between 

the electrolyzer and denuder for rich and stripped amalgam.

    (j) End box ventilation system means a ventilation system which 

collects mercury emissions from the end-boxes, the mercury pump sumps, 

and their water collection systems.

    (k) Cell room means a structure(s) housing one or more mercury 

electrolytic chlor-alkali cells.



[[Page 48]]



    (l) Sludge means sludge produced by a treatment plant that processes 

municipal or industrial waste waters.

    (m) Sludge dryer means a device used to reduce the moisture content 

of sludge by heating to temperatures above 65 [deg]C (ca. 150 [deg]F) 

directly with combustion gases.



[38 FR 8826, Apr. 6, 1973, as amended at 40 FR 48302, Oct. 14, 1975]