Ariz. Admin. Code § 18-2-706

Current through Register Vol. 30, No. 50, December 13, 2024

Section R18-2-706 - Standards of Performance for Existing Nitric Acid Plants

A. No person shall cause, allow or permit discharge from any nitric acid plant producing weak nitric acid, which is either:

1. 30 to 70% in strength by either the increased pressure or atmospheric pressure process, or

2. More than 1.5 kg of total oxides of nitrogen per metric ton (3.0 lbs/ton) of acid produced expressed as nitrogen dioxide.

B. The opacity of any plume subject to the provisions of this Section shall not exceed 10%.

C. A continuous monitoring system for the measurement of nitrogen oxides shall be installed, calibrated, maintained and operated by the owner or operator, in accordance with Section R18-2-313.

D. The test methods and procedures required by this Section are as follows:

1. The reference methods in 40 CFR 60, Appendix A shall be used to determine compliance with the standard prescribed in subsection (A) as follows:

a. Method 7 for the concentration of NOx;

b. Method 1 for sample and velocity traverses;

c. Method 2 for velocity and volumetric flow rate;

d. Method 3 for gas analysis.

2. For Method 7, the sample site shall be selected according to Method 1 and the sampling point shall be the centroid of the stack or duct or at a point no closer to the walls than 1 m (3.28 ft.). Each run shall consist of at least four grab samples taken at approximately 15-minute intervals. The arithmetic mean of the samples shall constitute the run value. A velocity traverse shall be performed once per run.

3. Acid production rate, expressed in metric tons per hour of 100% nitric acid, shall be both:

a. Determined during each testing period by suitable methods, and

b. Confirmed by a material balance over the production system.

4. For each run, nitrogen oxides, expressed in g/metric ton of 100% nitric acid, shall be determined by dividing the emission rate in g/hr by the acid production rate. The emission rate shall be determined by the equation:

g/hr = Q_s x c

where Q_s = volumetric flow rate of the effluent in dscm/hr, as determined in accordance with subsection (D)(1)(c), and c = NOx concentration in g/dscm, as determined in accordance with subsection (D)(1)(a).

Ariz. Admin. Code § R18-2-706

Former Section R18-2-706 repealed effective September 26, 1990 (Supp. 90-3). New Section R18-2-706 renumbered from R18-2-506 effective November 15, 1993 (Supp. 93-4).