Reducing Environmental Impact to Air, Water & Land
Chevron’s Pascagoula Refinery employs effective measures to reduce emissions. These efforts include leak detection and repair, adding emissions controls to many tanks, and continuing to upgrade pollution-control equipment and technology. Additionally, process changes that reduce severity of operating conditions, like temperature and pressure, also contribute to emissions reductions.
Reducing Chemical Emissions
NOx and SO2 emissions at Pascagoula have decreased by 62 percent since 2005. This has been achieved as part of an ongoing effort which includes installation of a state of the art Flare Gas Recovery system, additional tail gas units for Sulfur Recovery plants, installation of pollution controls on existing furnaces, and replacing outdated steam boilers with new equipment with better emissions controls.
The refinery continues to seek opportunities to reduce emissions from Volatile Organic Compounds (VOCs) and toxic chemicals. The refinery manages several inspection and repair programs for various types of equipment such as valves, pumps, cooling towers, and tanks. Vapor recovery systems are used to control VOC emissions from loading operations at the wharf and marketing terminal. In addition, devices such as carbon absorption canisters are utilized to control toxics such as benzene.
The refinery continues to employ new technology and procedures that reduce waste generation or recover waste and transform it into useful products. We reduce waste by decreasing waste sources, recycling, using less hazardous materials, and treating waste inside the refinery.
In September 2009, the Pascagoula Refinery attained a significant environmental milestone. The refinery achieved the U.S. Environmental Protection Agency’s designation of “Corrective Action Remedy Construction Complete With Controls,” known as the CA550. This designation is the culmination of more than 24 years of work investigating and installing technically sound and innovative means of controlling and cleaning waste on refinery property. The refinery has spent more than $44 million on corrective action work of this kind since 1998.
Reducing Hazardous Waste
Since 2010 (baseline year), the refinery has decreased the annual generation of hazardous waste by 37 percent. This decline has occurred even though the refinery continues to grow and become more complex.
- Approximately 1.4 million barrels of oil is recovered from refinery process water each year and recycled back into our units to be converted to sale-able products.
- Process by-product gas is treated to remove 99.96 percent of its H2S and used as fuel gas, reducing natural gas purchases by approximately 39 billion standard cubic feet per year.
- Approximately 174 billion gallons per year of cooling water is recirculated through the refinery.
- Approximately 1.7 billion gallons per year of condensate recovered from the refinery steam system is reused as boiler feed water.
- Approximately 470 million gallons per year of sour process water are treated to recover approximately 19,000 tons ammonia and 365,000 tons of sulfur. Both chemicals are sold to fertilizer manufacturers. Most of the water is re-used in refinery processes to remove salts.
- CO2, a byproduct of manufacturing H2 from natural gas, is used in the effluent system for pH control, minimizing the need for purchased chemicals.
- Approximately 2,000 tons of spent catalyst are recycled each year through metallurgical smelters to recover the metals for reuse in the steel and copper industry.
- Approximately 5,000 tons of scrap metal are recycled each year.
- Approximately 110,000 barrels of oily solids material are recycled into the refinery processes and not sent off site as waste each year.
- Approximately 90,000 tons of spent acid are sent from the refinery for recycling each year.
- Approximately 125,000 pounds of paper products are recycled each year.
We welcome comments and questions about our environmental policies
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2010 Baseline Year: In calculating waste reductions required by government regulations, facilities use a baseline year, which is normally within a few years of the regulation enactment, to serve as a point of comparison. The refinery chose 2010 as the baseline year for toxic chemicals comparison in order to participate in EPA’s Voluntary Toxic Emission Reduction Program, known as the 33/50 program.