WSP in the UK & Ireland
Principal / Associate Wastewater Process Engineer
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Principal / Associate Wastewater Process Engineer
Job Title: Associate Waste Water Process Engineer
Location: Birmingham, Bristol, Manchester, Liverpool, London, Newcastle or Glasgow
About the Role…
At WSP, you can design a career as unique as you—and make meaningful progress on projects that matter.
An opportunity has arisen for an experienced Associate Waste Water Process Engineer to join our Water Engineering teams. You’ll play a pivotal role in process engineering design for wastewater and water reuse projects across the UK and globally.
Working within multidisciplinary project teams, you’ll contribute to project design stages—from feasibility and optioneering to detailed designs for procurement, construction, and procurement reviews. As an expert in waste water processes, you’ll help deliver exceptional services for high-profile clients while supporting junior staff, driving technical excellence, and collaborating with a range of disciplines.
Key Responsibilities
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Produce process design deliverables, including:
- Optioneering studies
- Process calculations and mass balance
- Process flow diagrams (PFDs)
- Piping and instrumentation drawings (P&IDs)
- Sketches and basis of design reports
- Ensure optimised solutions for each project
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Lead outlier or detailed process engineering design.
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Conduct site visits to acquire data and engage with operators.
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Provide technical input for procurement, vendor relationships, and client discussions.
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Attend technical reviews such as:
- HAZOP (Hazard and Operability Studies)
- HAZID (Hazard Identification)
- ENVID (Environmental Impact Assessments)
- SWIFT (Systematic Playing Out Workshops)
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Offer technical guidance, mentorship, and supervision to junior engineers.
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Collaborate across disciplines to ensure integrated design that meets quality, cost, and timeline expectations.
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Participate in bid proposals through input on work scopes, schedules, and budgets.
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Liaise confidently with internal and external clients to address their needs.
Requirements
You’ll demonstrate:
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Significant experience in delivering process engineering design for infrastructure projects, ideally leading wastewater treatment solutions (municipal or industrial).
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Expertise in:
- Primary and secondary treatment systems
- Tertiary treatments (filtration, clarification, chemical dosing, phosphorus removal, ASP, MBBR, MBR, and advanced biological processes).
- Circular economy and Zero Liquid Discharge concepts.
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Consultancy experience in a process engineer role, with a focus on technical quality assurance for deliverables like:
- Technical specifications
- Process control philosophies
- P&IDs, mass balances, and procurement documents.
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Technical writing & communication skills to present findings clearly, whether through reports or verbal discussions with clients, colleagues, or senior stakeholders.
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Confidence to lead multi-disciplinary meetings (in-person and virtual) and represent WSP’s technical interests.
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Travel willingness—we require active participation in site visits to assess operational processes and new project assessments.
Why Apply?
Just because you don’t tick every box doesn’t mean you’re not a fit. Every skills set matters—sometimes talent takes unexpected forms.
Imagine a better future for yourself and the field of infrastructure—there’s room for your work to benefit and inspire generations to come. WSP helps you get there.
Join us and become part of a team defining the future in engineering. Apply today.
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About WSP
We are a global leader in engineering and professional services, driving positive change with a culture of innovation, integrity, and inclusion. Our UK & Ireland teams of over 11,000 professionals deliver meaningful local impact through international insight.
Work-Life Balance & Flexibility
- Hybrid working model: 2 days at home, 3 in an office—with modern workspaces available across the UK.
- WSP My Hour: Take 1 flexible hour daily for personal needs while arranging make-up time.
- Part-time, flexible, and additional leave options with adjustable bank holiday usage.
Inclusivity & Belonging
- Valued backgrounds and authentic identities are celebrated.
- Employee Resource Groups (ERGs) foster a collective environment of support and belonging.
- Mandatory support for meeting accessibility needs, including disability adjustments.
Health & Wellbeing
- Thrive Programme: Resources for improved health and well-being.
- Virtual GP services: NHS Irish Medical Council-accessible healthcare advice.
- Gymflex discounts: Up to 40% off annual memberships.
- Support all stages of life, including menopause care.
Development & Growth
- Dedicated career growth through training, mentorship, and Chartership programmes.
- Powerful support systems designed to elevate your expertise.
Diversity & Inclusion
WSP commits to equity and ensuring all qualified individuals receive opportunities, regardless of background or circumstance. As a Disability Confident Leader, we prioritise disabled candidates and make reasonable adjustments when needed.
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