New produced-water treatment aims to eliminate scale

Water treatment technology for treating produced water from oil sands thermal processes such as steam assisted gravity drainage (SAGD) was introduced by Aquatech on 11 May 2013.

The HEVAP™ high efficiency evaporation process preconditions the feedwater by incorporating a softening step combined with additional conditioning of the feedwater prior to treatment by the evaporators. This process provides the evaporators with essentially a scale-free environment in which to operate.

“Increasingly, oil producers in Alberta are choosing to go with evaporation technology as the treatment method for reusing/recycling their produced water in thermal SAGD process because it offers a variety of benefits including higher water recovery rates (lower make-up / reduced blow down), smaller footprint, and easier operability,” said Alan R Daza, vice president of sales and business development for Aquatech‘s Infrastructure & Major Projects division.

“However, managing scaling has been a challenge with evaporation technology. Aquatech’s HEVAP evaporative process addresses this issue as it has been engineered to operate in a scale-free environment while also providing other process advantages to oil producers,” he added.

Other advantages, which help lower operating expense and life-cycle costs, include:

· High allowable concentration factors
· Increased recovery of high quality reusable water
· No requirement for anti-scalants
· No requirement for EDTA dosing
· No requirement for mechanical cleaning.