ProSep has made a number of changes to its senior team as it looks to strengthen its position amid the oil price decline.
The company said Patrick McCarthy, who joined the board of directors one year ago, will become the chief executive.
Former boss Neil Poxon will remain with ProSep to oversee the transition until the end of this year.
A US oil, gas and water treatment firm has announced a 12-month joint industry project in the Middle East.
Houston-based ProSep has launched an Industry Technology Facilitator (ITF) joint industry project (JIP) with Qater Petroleum and Petroleum Development Oman.
The scheme kicked off in December last year and will see the three companies collaborate on an offshore capable unit for oil-in-water removal and media regeneration.