A. No person shall cause, allow or permit discharge from any nitric acid plant producing weak nitric acid, which is either:
1. Thirty to seventy percent 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 ten percent.
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 17.11.200.
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 of this section 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 one meter (3.28 ft.). Each run shall consist of at least four grab samples taken at approximately fifteen-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 one hundred percent 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 one hundred percent 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 × c
where:
Q s = Volumetric flow rate of the effluent in dscm/hr, as determined in accordance with paragraph (1)(c) of this subsection, and
c = NO x concentration in g/dscm, as determined in accordance with paragraph (1)(a) of this subsection.
(Ord. 2017-20 § 3 (part), 2017: Ord. 1993-128 § 4 (part), 1993)