Senior Process Engineer

Ecolab

Witterswil, Switzerland

As a senior process engineer, you will be under guidance of more senior engineers and will be involved in the design, optimization and continuous improvement of ultra pure water and industrial wastewater treatment systems. The role is based in Witterswil, Solothurn, Switzerland and will require some international travelling.

How You’ll Make an Impact:

Main responsibility: Support capital projects from concept through commissioning:

Design, calculate and optimize processes in the fields of ultrapure water and wastewater treatment, including:
- Filtration, activated carbon filters, advanced oxidation processes
- Reverse osmosis, ion exchange, EDI, UF/MF
- Degasification, UV oxidation, TOC reduction
- Chemical treatment, biological treatment, ZLD systems
Develop and review process flow diagrams (PFDs), piping and instrumentation diagrams (P&IDs), mass balances, and equipment specifications for major equipment items
Generate technical specifications for packaged units, process equipment
Participate in design reviews and clarifications at the early stages of process and basic engineering works
Generate process description and logic documents for complex water and wastewater treatment systems
Participate in HAZOP, FMEA and safety review or assessment
Work closely within the other engineering department and support project managers on project activities
Prepare documentation for submission and support project team on plant start-up, performance test, optimization and hand-over.
Support project team on commissioning activities, performance test, optimization, troubleshooting and hand-over
Provide training to the end customer operation and maintenance teams

Other responsibilities:

Provide technical support to the Ecolab operation and maintenance teams (training, guidance)
Troubleshoot process upsets and contamination events
Monitor system performance and water quality parameters (e.g., resistivity, TOC, silica, metals)
Conduct audit of a running system and provide audit report
Work closely with the innovation teams to develop new processes and digital tools

Qualifications:

Master’s degree or engineering school graduate in Chemical Engineering, Environmental Engineering, Mechanical Engineering, or related field
Bachelor’s degree with strong experience in UPW and /or wastewater treatment for semiconductor industry will be considered
Require minimum 5 years experience with good knowledge in process control, water and waste water treatment systems.
Experience in regulated or high‑purity industries (semiconductor, pharmaceuticals, biotech, energy...)
Strong understanding of water chemistry and treatment processes
Ability to interpret process data and laboratory results
Analytical thinking & problem-solving skills
Ability to work independently and in cross‑functional teams
Self-initiative and creativity, flexible and able to work under pressure
Strong communication and technical documentation abilities for collaboration with internal international departments, suppliers and customers
Mobility and willingness to travel worldwide, including extended trips
English proficiency for daily business; German, French or other languages are an added value
Swiss or EU citizenship or a C Swiss resident permit