- Refinery Wastewater Infrastructure
Burns & McDonnell designed and provided construction support for wastewater infrastructure necessary to remove contaminants contributing to effluent toxicity at a Texas refinery. The treatment facility receives approximately 5 million gallons of wastewater originating from refinery API oil-water separators, a natural gas liquids (NGL) facility and a chemical plant. The toxicity was originating from recalcitrant diesel range organics.
To address the problem, a new treatment train was constructed, an existing train was retrofitted, and another existing train was abandoned. The most significant modification to the treatment process was the addition of powder-activated carbon to the biological unit process.
Infrastructure that was designed and/or retrofitted included:
- Splitter structure
- Two biological unit processes
- Two PAC silos
- Two clarifiers
- Two RAS/WAS pump stations
- Filter feed pump station
- Polymer system
- Disinfection system
- Solids handling process
- Nonpotable water system
The design and construction were completed in seven months. The fast-track project required the use of two general contractors to build the new facilities while keeping the treatment plant operational. The project was completed on schedule and met National Pollutant Discharge Elimination System (NPDES) permit requirements at startup.
- Conceptual and final design
- Construction management support
- Equipment procurement assistance
Effluent quality before and after the improvements:
|COD||65 percent removal||90 percent removal|
|Ammonia||80 percent removal||95% removal|
|Toxicity||40 percent survival||100 percent survival|
|Tertiary filter backwash||Every 24 hours||Every 36-48 hours|