Senior Process Engineer - Water & Wastewater Treatment

About the role

PACT Engineering FZC is seeking an experienced Senior Process Engineer with strong technical expertise in the design and engineering of industrial and municipal water treatment, desalination and wastewater treatment plants. The successful candidate will independently develop process designs, perform engineering calculations, prepare technical documentation and coordinate with multidisciplinary engineering teams on EPC and packaged treatment plant projects.

Key responsibilities

• Develop and review process flow diagrams (PFDs), piping and instrumentation diagrams (P&IDs), process descriptions and design basis documents.
• Perform process calculations, hydraulic calculations, mass balances and equipment sizing.
• Design and select water and wastewater treatment processes, including reverse osmosis, ultrafiltration, multimedia filtration, activated carbon and greensand filtration, chemical pretreatment, clarification, coagulation, flocculation, sludge treatment, STPs, MBR, MBBR, SBR and biological treatment systems, as well as chemical dosing, neutralization, disinfection and CIP systems.
• Prepare equipment datasheets and technical specifications, hydraulic profiles, pump head calculations, control philosophies, process control narratives, cause-and-effect matrices and operating sequences.
• Review vendor offers, drawings and calculations, prepare technical bid evaluations and vendor document review comments.
• Coordinate with mechanical, electrical, instrumentation, automation and project engineering teams, review 3D models and equipment layouts, and respond to client technical comments, RFIs and clarifications.
• Support HAZOP, design reviews, FAT, pre-commissioning, commissioning and performance testing.

Required profile

• Bachelor's degree in Chemical Engineering, Environmental Engineering or a closely related discipline.
• Minimum 8-10 years of direct experience in water and wastewater treatment engineering.
• Strong knowledge of RO design, membrane systems, filtration, chemical dosing and hydraulic calculations.
• Familiarity with AWWA, ASTM, ASME and international water treatment standards.
• Experience with membrane design software such as WAVE, ROSA or equivalent is an advantage.
• Preference for engineers who can take a project from design basis through detailed engineering and support commissioning, rather than those only experienced in plant operation or maintenance.
• Preference for EPC contractors, water treatment OEMs or engineering consultancy experience.

Required skills

• Proficiency in AutoCAD and MS Excel.
• Engineering calculation tools.
• Technical reporting, engineering documentation and English communication skills.