7 DE Admin. Code 1109. Emissions of Sulfur Compounds From Industrial Operations

Production Rate (Tons per Day) | Mass Emission Rate (Pounds per Hour)

100 | 75

300 | 210

500 | 345

700 | 480

900 | 615

1,100 | 750

1,300 | 885

1,500 | 1020

Production Rate (Tons per Day) | Mass Emission Rate (Pounds per Hour)

50 | 425

100 | 550

200 | 800

300 | 1,050

400 | 1,300

500 | 1,550

600 | 1,800

700 | 2,050

800 | 2,300

900 | 2,550

1,000 | 2,300

1.0 General Provisions

1.1 The emission of sulfur dioxide from process operations shall be controlled to a limit that shall meet the ambient air quality requirements.

1.2 For all tables in this regulation, unless otherwise indicated, the emission limitation for a production rate between any 2 consecutive production rates shall be determined by linear interpolation.

1.3 For all tables in this regulation, unless otherwise indicated, the emission limitation for a production rate above the maximum production rate or below the minimum production rate shall be determined by linear extrapolation.

28 DE Reg. 591 (02/01/25)

2.0 Restrictions on Sulfuric Acid Manufacturing Operations

2.1 No person shall cause or allow the emission of sulfur dioxide in the tail gases from any existing sulfuric acid manufacturing operation to exceed either a concentration of 1,000 parts per million by volume or a mass emission rate as specified in Table 2-1 of this regulation.

2.2 No person shall cause to be discharged into the atmosphere from any existing sulfuric acid plant any gases which contain acid mist, expressed as H 2 SO 4 , in excess of 0.25 g per kg of acid produced (0.5 lb per ton) the product being expressed as 100% H 2 SO 4 .

2.3 The provisions of subsection 2.2 of this regulation shall not apply to acid plants used as sulfur dioxide control systems, to chamber process plants, to acid concentrators or to petroleum storage and transfer facilities.

2.4 The reference methods used to determine compliance with standards prescribed in subsection 2.2 of this regulation shall be those set forth in 1.5 of 7 DE Admin. Code 1120 .

28 DE Reg

visions of subsection 2.2 of this regulation shall not apply to acid plants used as sulfur dioxide control systems, to chamber process plants, to acid concentrators or to petroleum storage and transfer facilities.

2.4 The reference methods used to determine compliance with standards prescribed in subsection 2.2 of this regulation shall be those set forth in 1.5 of 7 DE Admin. Code 1120 .

28 DE Reg. 591 (02/01/25)

3.0 Restriction on Sulfur Recovery Operations

3.1 No person shall cause or allow the emission of sulfur dioxide in the tail gases from existing sulfur recovery operations to exceed either a concentration of 2,000 parts per million by volume or a mass emission rate as specified in Table 3-1 of this regulation.

ALLOWABLE MASS EMISSION RATE OF SULFUR DIOXIDE

FROM SULFUR RECOVERY OPERATIONS

3.2 Except as provided in Section 11.0 of 7 DE Admin. Code 1120 , NEW SOURCE PERFORMANCE STANDARDS, no person shall cause or allow the emission of sulfur dioxide in the tail gases from new sulfur recovery operations to exceed either a concentration of 2,000 parts per million by volume or a mass emission rate as specified in Table 3-1 of this regulation.

28 DE Reg. 591 (02/01/25)

4.0 Stack Height Requirements

Minimum stack heights for new sources of sulfur dioxide will be determined by the Department on an individual basis. Such stack height requirements will be based on considerations such as, but not limited to, existing ambient levels of sulfur dioxide, local sources, atmospheric dispersion calculations, land use, and population density. The provisions of 7 DE Admin. Code 1127 shall apply to these calculations.

12 DE Reg. 347 (09/01/08)

28 DE Reg. 591 (02/01/25)