- Refinery Water Treatment System
Burns & McDonnell developed FEL-2, FEL-3 and completed design documents for a water treatment system at a Midwestern refinery. Water is supplied from 15 100-gallon-per-minute (gpm) high-quality potable water wells, which is used to maintain hydrocarbon plumes within the refinery property, refinery waste streams and city reclaimed wastewater. Water is managed to feed either the cooling water make-up water treatment system or the boiler feed water treatment system. All waters go through Pall microfiltration skids ahead of reverse osmosis membrane skids.
The plant will be housed in a 21,000-square-foot building outside of the battery limits of the refinery. The refinery water has high total organic carbon levels and requires special treatment to avoid fouling the reverse osmosis elements. Piping, electrical, air and other utility lines are modeled in 3-D. Other facilities include bulk outdoor storage of six chemicals, indoor chemical feed skids for the six chemicals with two feed points each, and transfer of three chemicals for EFMs and CIPs of the microfiltration systems.
Also included are outdoor storage and feed of biocide, water supply piping, six stainless steel tanks, three exterior BF permeate pumps, 28 process pumps, and air supply systems. The project also includes an EIO/SUB (Electrical/Instrumentation/Operations/Substation) Building.
- Detail design
The cooling water system is designed for an initial permeate capacity of 1,700 gpm, expandable to 2,300 gpm, with a final hardness of 50 mg/L. Facilities include chemical feed for oxidation and coagulation; three strainers; three microfiltration feed pumps with a slot for a future pump; two microfiltration skids with slots for two future microfiltration skids; break tank; five nanofiltration feed pumps; sodium bisulfate feed; biocide; anti-scalant feed; on-skid cartridge filters; and three nanofiltration feed pumps and three stage nanofiltration skids with a slot for two future pumps and skids.
The boiler water feed system includes chemical feed for oxidation and coagulation, two strainers, three microfiltration feed pumps, two microfiltration skids, break tank, sodium bisulfate feed, biocide, anti-scalant feed, four RO feed pumps, on-skid cartridge filters, and four two-stage reverse osmosis (RO) skids with a slot for one future pump and skid. This system is designed to deliver 1,100 gpm of permeate at a hardness of 2 mg/L to feed zeolite filters, expandable to 1,500 gpm. Microfiltration backwash will be recycled through a 200-gpm backwash reuse microfiltration system, and all other waste streams will be conveyed to the oily water sewer.