Engineering group Bechtel on Monday purchased
Chevrons wastewater treatment (WWT) process, a technology that improves the
efficiency of petroleum refineries.
The WWT Process is a proprietary, two-stage sour water
stripping process that separates ammonia and hydrogen sulfide
streams from sour waters generated by a refinerys process units.
The technology also allows
debottlenecking of sulfur plants and can reduce the cost of new
sulfur units, especially in refineries that process high
This is a world-class technology that enhances our
capability to deliver customers high-quality, technologically
superior water and sulfur processing units more efficiently and
cost effectively, said Scott Johnson, vice president and
general manager of Bechtels onshore oil and
This acquisition complements our current suite of refinery technologies and continues
our long-standing practice of making sure we have the right
resources to help our customers meet their needs," he
The WWT Process was developed and improved by Chevron
over the past 40 years. The process achieves higher purity
separation and recovery of ammonia from sour water streams,
reduces the size requirements of sulfur plants and removes
operating problems associated with ammonia salts in sulfur
units, according to company officials.
The stripped water is suitable for reuse or discharge through
downstream treating facilities. The high-purity hydrogen
sulfide is a premium feed to conventional sulfur recovery units
or sulfuric acid plants.
Meanwhile, the ammonia may be recovered for commercial sale,
internal use, or separately incinerated.