Monday, April 20, 2015

New Data Reveals Increase in Emissions From Natural Gas Drilling Operations, Reporting Requirements Expand

The Department of Environmental Protection Monday released the 2013 air emissions inventory for the natural gas drilling industry that shows increases in several categories of contaminants.
The data is required to be reported to DEP under Pennsylvania’s Air Pollution Control Act.
The inventory represents 2013 emissions from Marcellus Shale natural gas production and processing operations as well as compressor stations that receive gas from coal gas and conventional oil and gas well sites.
“The increases were not unexpected,” Acting DEP Secretary John Quigley said. “The industry is growing, and each year we are expanding the types and number of facilities from which we collect data so that we have a more comprehensive understanding of air quality issues.”
In 2013, the number of well sites included in the emissions inventory increased by 18.3 percent. The number of midstream facilities that submitted data increased by 8.2 percent.
The data reported for six major categories of contaminants are provided below:
NATURAL GAS EMISSIONS BY YEAR
Expressed in Tons per Year
Year
Well Sites Reporting
Midstream Facilities Reporting
Carbon Monoxide (CO)
Nitrogen Oxides
(NOx)
Particulate Matter
(PM10)
Sulfur Dioxide
(SO2)
Volatile Organic Compounds
(VOCs)
Methane
2011
8,976
140
6,852
16,542
577
122
2,820
NA
2012
8,687
400
7,350
16,361
600
101
4,024
123,884
2013
10,277
433
6,606
17,659
670
159
4,790
107,945


The 2013 data shows the following difference from 2012 levels:
— Sulfur dioxide – 57 percent increase
— Volatile Organic Compounds – 19 percent increase
— Particulate matter – 12 percent increase
— Nitrogen oxides -- 8 percent increase
— Methane – 13 percent decrease
— Carbon monoxide – 10 percent decrease
DEP began collecting emissions data from owners and operators of unconventional natural gas sources in 2011. For 2012, DEP expanded the data reporting requirement to include mid-stream compressor stations that support the conventional natural gas industry. DEP again expanded the reporting requirements in 2013 to include data from mid-stream compressor stations that support coal-bed methane formations.
In addition to compressor stations, other sources and activities of natural gas operations that DEP identified as part of the inventory include dehydration units; drill rigs; fugitives, such as connectors, flanges, pump lines, pump seals and valves; heaters; pneumatic controllers and pumps; stationary engines; tanks, pressurized vessels and impoundments; venting and blow down systems; well heads and well completions.
“While we are experiencing some increases in emissions from the natural gas sector, overall, our air quality continues to improve due to emissions reductions from other point sources such as electric generating units,” Quigley said. “We remain committed to developing and implementing the most effective ways to control and reduce emissions from Pennsylvania’s natural gas sites.”
For more information, visit DEP’s Oil and Gas Facilities Emissions webpage.

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