---
kind: "section"
citation: "40 C.F.R. § 63.444"
title: "40"
number: "63.444"
heading: "Standards for the pulping system at sulfite processes."
url: "https://uscodex.org/cfr/40/63.444"
---

# §63.444. Standards for the pulping system at sulfite processes.

- (a) The owner or operator of each sulfite process subject to the requirements of this subpart shall control the total HAP emissions from the following equipment systems as specified in paragraphs [(b)](#b) and [(c)](#c) of this section.
  - (1) At existing sulfite affected sources, the total HAP emissions from the following equipment systems shall be controlled:
    - (i) Each digester system vent;
    - (ii) Each evaporator system vent; and
    - (iii) **Each pulp washing system.**
  - (2) At new affected sources, the total HAP emissions from the equipment systems listed in [paragraph (a)(1)](#a-1) of this section and the following equipment shall be controlled:
    - (i) Each weak liquor storage tank;
    - (ii) Each strong liquor storage tank; and
    - (iii) **Each acid condensate storage tank.**
- (b) Equipment listed in [paragraph (a)](#a) of this section shall be enclosed and vented into a closed-vent system and routed to a control device that meets the requirements specified in [paragraph (c)](#c) of this section. The enclosures and closed-vent system shall meet the requirements specified in [§ 63.450](/cfr/40/63.450.md). Emissions from equipment listed in [paragraph (a)](#a) of this section that is not necessary to be reduced to meet [paragraph (c)](#c) of this section is not required to be routed to a control device.
- (c) The total HAP emissions from both the equipment systems listed in [paragraph (a)](#a) of this section and the vents, wastewater, and condensate streams from the control device used to reduce HAP emissions, shall be controlled as follows.
  - (1) **Each calcium-based or sodium-based sulfite pulping process shall—**
    - (i) Emit no more than 0.44 kilograms of total HAP or methanol per megagram (0.89 pounds per ton) of ODP; or
    - (ii) **Remove 92 percent or more by weight of the total HAP or methanol.**
  - (2) **Each magnesium-based or ammonium-based sulfite pulping process shall—**
    - (i) Emit no more than 1.1 kilograms of total HAP or methanol per megagram (2.2 pounds per ton) of ODP; or
    - (ii) **Remove 87 percent or more by weight of the total HAP or methanol.**

## Notes

### Source

Source: 63 FR 18617, Apr. 15, 1998, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.