MOJAQMD RULE 1004 EMISSION STD. FOR MERCURY

LAST REVISED 12/03/76

(Adopted: December 3, 1976)

Rule 1004

Emission Standard for Mercury

(a) Definitions

(1) CONDENSER STACK GASES means the gaseous effluent evolved from the stack or processes using heat to extract mercury metal from mercury ore.

(2) MERCURY means the element mercury, excluding any associated elements, and includes mercury in particulates, vapors, aerosols, and compounds.

(3) MERCURY ORE means a mineral mined specifically for its mercury content.

(4) SLUDGE means sludge produced by a treatment plant that processes municipal or industrial waste waters.

(5) SLUDGE DRYER means a device used to reduce the moisture content of sludge by heating to temperatures above 65oC (ca. 150oF) directly with combustion gases.

(b) Emission Standard

(1) Emissions to the atmosphere from sludge incineration plants, sludge drying plants, or a combination of these that process wastewater treatment plant sludges shall not exceed 3,200 grams of mercury per 24-hour period.

(c) Testing Procedure

(1) Sludge incineration and drying plants

(A) Unless a waiver of emission testing is obtained under Rule 1001 (b) each owner or operator of a source subject to the standard in Rule 1004 shall test emissions from that source. Such tests shall be conducted in accordance with the procedures set forth below.

(B) Emissions shall be tested according to methods specified by the Air Pollution Control Officer;

(i) The test shall be performed within 90 days of the effective date of these regulations in the case of an existing source or a new source which has an initial start-up date preceding the effective date.

(ii) The test shall be performed within 90 days of start-up in the case of a new source which did not have an initial start-up date preceding the effective date.

(C) The Air Pollution Control Officer shall be notified at least 30 days prior to an emission test, so that he may, at his option, observe the test.

(D) Samples shall be taken over such a period or periods as are necessary to determine accurately the maximum emissions that will occur in a 24-hour period. No changes shall be made in the operation that would potentially increase emissions above the level determined by the most recent stack test until the new emission level has been estimated by calculation and the results reported to the Air Pollution Control Officer.

(E) All samples shall be analyzed, and mercury emissions shall be determined within 30 days after the stack test. Each determination shall be reported to the Air Pollution Control Officer by a registered letter dispatched before the cost of next business day following such determination.

(F) Records of emission test results and other data needed to determine total emissions shall be retained at the source and shall be made available for inspection by the Air Pollution Control Officer for at least two years.

(2) Sludge Sampling

(A) As an alternative means from demonstrating compliance with Rule 1004, an owner or operator may follow the procedures specified in this section.

(i) A sludge test shall be conducted within 90 days of the effective date of these regulations in the case of an existing source or new source which has an initial start-up date preceding the effective date; or

(ii) A sludge test shall be conducted within 90 days of start-up in case of a new source which did not have an inial start-up date preceding the effective date.

(B) The Air Pollution Control Officer shall be notified at least 30 days prior to a sludge sampling test so that he may, at his option, observe the test.

(C) Sludge shall be sampled according to paragraph (C)(

i) below. Sludge charging rate for the plant shall be determined according to paragraph (C)

(ii) of this section, and the sludge analysis shall be performed according to paragraph (C)

(iii) of this section.


(i) The sludge shall be sampled after dewatering and before incineration or drying, at a location that provides a representative sample of the sludge that is charged to the incinerator or dryer. Eight consecutive grab samples shall be obtained at intervals of between 45 and 60 minutes and thoroughly mixed into one sample. Each of the eight grab samples shall have a volume of at least 20 mi but not more than 400 mi. A total of three composite samples shall be obtained within an operating period of 24 hours. When the 24-hour operating period is not continuous, the total sampling period shall not exceed 72 hours after the first grab sample is obtained. Samples shall not be exposed to any condition that may result in mercury contamination or loss.

(ii) The maximum 24-hour period sludge incineration or drying rate shall be determined by use of a flow rate measurement device that can measure the mass rate of sludge charged to the incinerator or dryer with an accuracy of 5 percent over its operating range. Other methods of measuring sludge mass charging rates may be used if they have received prior approval by the Air Pollution Control Officer.

(iii)The handling, preparation, and analysis of sludge samples shall be accomplished according to methods specified by the Air Pollution Control Officer.

(C) The mercury emissions shall be determined by use of the following equation:

E Hg = 1 x 10 -3 cQ

where

EHg = mercury emissions, g/day

c = mercury concentration of sludge on a dry

solids basis Hg/g (ppm).

Q = sludge charging rate, kg/day

(E) No changes in the operation of a plant shall be made after a sludge test has been conducted which would potentially increase emissions above the level determined by the most recent sludge test, until the new emissions level has been estimated by calculation and the results reported to the Air Pollution Control Officer.

(F) All sludge samples shall be analyzed for mercury content within 30 days after sludge sample is collected. Each determination shall be reported to the Air Pollution Control Officer by a registered letter dispatched before the close of the next business day following such determination.

(G) Records of sludge sampling, charging rate determination and other data needed to determine mercury content of wastewater treatment plant sludges shall be retained at the source and made available, for inspection by the Air Pollution Control Officer for a minimum of two years.

(d) Emission Monitoring

(1) Wastewater treatment plant sludge incineration and drying plants. All such sources for which mercury emissions exceed 1,600 g/day, demonstrated by any of the methods specified in this rule, shall monitor mercury emissions at intervals of at least once per year by any of the methods specified in this rule.