The oil refining process generates a significant volume of wastewater that contains a suite of challenging contaminants, from hydrocarbons to heavy metals and organic compounds. Oil production at a refinery relies on efficient and reliable wastewater treatment as it is impossible for the facility to operate without treating its effluent. Issues with the wastewater treatment systems can result in production limitations, as well as significant environmental impacts and violations. These systems can be complex, and they are sensitive to upset conditions due to poor feed quality, unexpected contaminants, or equipment breakdown.

This presentation will discuss a significant upset condition that impacted both the primary and secondary wastewater treatment system at a large West Coast refinery. We will present the processes that allowed for detection of the upset, and the steps taken by the operations group, technical team, and vendor support that helped maintain target production rates and avoid any environmental violations or impacts. The mitigation steps allowed for storage and post-upset treatment of the problematic effluent streams. The technical team evaluated options for treatment and environmental compliance, and the water treatment vendor supplied specialty biological treatment technology to get the system back online as quickly as possible. All of this contributed to a successful upset response and the implementation of best practices that can help all refineries facing a wastewater oil contamination.

Moderator:
Dan Harbs, Veolia

Speakers:
Angela Wharton, Chevron U.S.A. Inc.
Kai Zhang, Chevron U.S.A. Inc.