Client: Petrobras
Process: Water Treatment using Sulphate Removal
Country: Brazil
Contract Description: Single Module using Sulphate Removal Technology
Contract Date: July 2013
Contract Completion Date: March 2015
SRP Capacity: 180,000 BPD (28,600 m3/day)
Sea Water Conversion: 75%
Sea Water Feed Quality: 35,177 (tds)
Product Water Output Quality: <40mg/l sulphate
Project Description:
The project is for the design and supply of two seawater treatment plants sized for 200,000 BPD (31,795 m3/day) of low sulphate water with an integrated seawater reverse osmosis (SWRO) system with a capacity of 7,547 BPD (1,200 m3/day).
Project Scope:
The scope consists of a single lift module arrangement comprising: Coarse Inlet Strainers, Guard Cartridge Filtration, HP Feed Pumps, Sulphate Removal Membrane System, Vacuum Deaerator Package, SRP & SWRO HP Feed Pumps, Guard Cartridge Filters, Sulphate Removal and SWRO Trains, combined CIP (Clean In Place) System, Chemical Dosing Systems, Control System, Manual & Control Valves and Field Instrumentation.
Process Description:
Inlet feed is first coarse filtered to 80µm by automatic backwash strainers. This is further treated by a set of cartridge filters to provide fine filtration down to 5µm prior to the membrane trains. The set of cartridge filters supplies feed water for four (4) trains.
The conditioned water, boosted to the required feed pressure, enters the Sulphate removal trains. Each membrane train is fitted with pressure vessels containing SR90-440i nanofiltration elements. A recovery of 75% is achieved by a 2:1 brine staged configuration. Brine reject from the process is discharged overboard, while the low Sulphate permeate is routed to a vacuum type deaerator package, where oxygen is removed by mechanical and chemical means. A dedicated clean in place (CIP) package, consisting of cleaning tank, heater, pump and cartridge filter vessel is provided for membrane cleaning purposes.