Volatile Organic Compounds (VOC) Measurement Issues Reporting VOC Mass Emissions.

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Presentation transcript:

Volatile Organic Compounds (VOC) Measurement Issues Reporting VOC Mass Emissions

2 VOC Mass Emissions  It is important to approximate the mass of VOC emissions for certain programs, such as New Source Review (NSR)  EPA has stated in writing that VOC mass emissions should be based on the best approximation of actual VOC emitted and not based on a surrogate such as carbon

3 VOC Measurement Issues OECA and Regional Offices are requiring sources to report their VOC emissions on an actual mass basis rather than a surrogate mass basis

4 What Industry Categories Are Affected? Forest Products and Paper Ethanol Production Corn Refining (Wet Corn Milling) Sugar Beet Processing

5 How Do We Measure Actual Mass Emissions? EPA’s Office of Enforcement and the Regional Offices developed a testing protocol using existing EPA test methods and new calculation procedures to calculate actual mass VOC emissions Called it the Midwest Scaling Protocol

6 Midwest Scaling Protocol (MSP) What is it? Designed for application to the corn wet milling industry – may not be suitable for other industries Allows reporting of results from Methods 25 and 25A as the mass of emitted VOC without all of the necessary calibration standards Not the only way of measuring VOC mass emissions

7 MSP (cont.) How does it work? Uses Method 18 to identify the kinds and relative amounts of VOC in the sample Based on this information, it calculates a weighted average molecular weight- per-carbon atom for the VOC

8 MSP (cont.) How does it work?...cont. Uses Method 25 or Method 25A to measure the carbon content of the sample Then multiplies the carbon content by the weighted average molecular weight-per- carbon atom to get the VOC mass Measured PPM C x Molecular Weight/Carbon x Flow = Tons/Year VOC Where Molecular Weight/Carbon is the Scaling Factor

9 Industry Methods for VOC Mass Emissions Several industry trade associations have indicated that they would like to develop methods especially for their sources EPA believes this is beneficial and is willing to work with any group to develop better VOC measurement methods

10 The issue: The Corn Refiners Association (CRA) wanted an alternative to the MSP First step: A test plan was developed to evaluate their proposed method Met with EPA to get concurrence Case Study: The Corn Refiners Association

11 Method Proposal: The CRA proposed to use Method 18 to measure all VOC The individual VOC masses would then be summed to produce a cumulative mass Case Study: CRA (cont.)

12 Case Study: CRA (cont.) CRA’s Pre-Survey Procedure: A new pre-survey procedure was developed to use prior to each test Results from the pre-survey are used to design appropriate sampling and analytical conditions for Method 18 The pre-survey procedure is the key to demonstrating that most of the VOC have been collected and measured

13 After EPA concurred with the proposal, the CRA conducted two field tests of the method The CRA has submitted the test results to EPA for review Case Study: CRA (cont.)

14 Current Status: EPA Accepted the CRA method  Addressed the affect of the new data on existing air programs  Posted the method on the EMC in the Other Methods category Next Steps: Developing a rulemaking package to place the method in 40 CFR Part 51, Appendix M Case Study: CRA (cont)

15 Industry Methods Any method that measures VOC emissions on a mass basis would be acceptable, but EPA prefers those that measure individual VOC Because of the complexity of most VOC emission streams, “VOC Mass” does not imply measuring 100% of the organic compounds

16 Industry Methods (cont. ) Will give EPA better data on which to base control decisions  More accurate emission factors  More accurate emission modeling Will allow EPA to consider photochemical reactivity in making control decisions

17 Industry Methods (cont.) Any new industry methods will be published in the Federal Register for public notice and comment After resolving any comments, the final methods will be incorporated in the Code of Federal Regulations