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About the Role

This role provides an excellent opportunity to influence the planning, design and delivery of major wastewater investment programmes, working collaboratively with Thames Water, contractors and multidisciplinary design teams.

Responsibilities

• Lead process engineering input across feasibility, concept, outline, and detailed design stages for wastewater and sludge treatment projects.
• Act as a trusted technical advisor to Thames Water, supporting strategic discussions, project development and investment planning activities.
• Develop and review process designs, including process flow diagrams (PFDs), P&IDs, mass balances, hydraulic calculations, and equipment sizing.
• Apply expertise in wastewater treatment processes, including biological nutrient removal, sludge treatment, digestion, dewatering, and emerging treatment technologies.
• Analyze operational data from wastewater treatment works to identify optimisation opportunities and improve plant performance, resilience, efficiency and compliance.
• Undertake process modelling and simulation to support design development, operational improvement and investment planning.
• Prepare high-quality technical reports, design documentation, business cases, proposals and client presentations.
• Review and approve process engineering deliverables, ensuring technical excellence and compliance with relevant standards and Thames Water requirements.
• Develop and maintain strong working relationships with Thames Water stakeholders through regular engagement, including working from the client's Reading offices as required.
• Mentor and support junior engineers, fostering technical growth and sharing best practice across the business.
• Collaborate with resource coordinators and discipline leads to manage project resources and technical development initiatives.
• Support business development activities, identifying opportunities for growth within the Thames Water framework and contributing to proposals, tenders and client account planning.

Requirements

• Degree in Chemical Engineering or a related engineering discipline.
• Chartered Engineer (CEng) status with a recognised Professional Institution.
• Significant experience in municipal wastewater treatment and/or sludge treatment process design.
• Strong understanding of wastewater treatment technologies, including activated sludge processes, nutrient removal, tertiary treatment and sludge processing.
• Experience delivering feasibility studies, outline designs and detailed designs for wastewater treatment schemes within the UK water sector.
• Ability to build and maintain strong client relationships and operate effectively within client organisations.
• Experience working within collaborative delivery models, frameworks or long-term water industry programmes.
• Strong understanding of wastewater treatment operational challenges and opportunities for process optimisation.
• Excellent technical report writing and communication skills.
• Proven ability to review and assure technical calculations, reports and engineering deliverables.
• Ability to mentor and develop engineers and contribute positively to team growth.
• Willingness to travel regularly and work from Thames Water's Reading offices to support client engagement and programme delivery.
• Experience working on AMP programmes and wastewater capital delivery frameworks.
• Demonstrable experience of working collaboratively with UK water utility clients, preferably Thames Water.
• Familiarity with Thames Water standards, design procedures and governance processes.
• Experience supporting business development, account management and strategic client engagement activities.
• Knowledge of digital delivery tools, process modelling software and data-driven performance optimisation techniques.
• Commitment to continuous professional development and application of industry best practice.

Skills

• Process engineering
• Wastewater treatment
• Sludge treatment
• Process flow diagrams (PFDs)
• P&IDs
• Mass balances
• Hydraulic calculations
• Equipment sizing
• Biological nutrient removal
• Sludge processing
• Dewatering
• Process modelling
• Technical report writing
• Communication skills
• Mentoring
• Business development

Location

• Cardiff
• London
• Cambridge
• Croydon
• Reading

Work Type

• Hybrid working

Experience Level

• Principal/Associate

Education Level

• Degree in Chemical Engineering or related engineering discipline
• Chartered Engineer (CEng)

Benefits

• Private medical insurance
• Health cash plan
• Access to Peppy (menopause support)
• Comprehensive wellbeing program
• Flexible salary options for health benefits
• Pension contributions matching
• Life assurance (up to 4x basic salary, option to increase to 6x)
• Income protection scheme
• Flexible benefits (increased life assurance, critical illness insurance, payroll saving, will writing)
• Annual bonus schemes
• 33-35 days holiday per year (inclusive of public holidays)
• Ability to buy or sell leave
• Holiday entitlement increased to minimum 35 days after 5 years' service
• Employee saving schemes and discounts
• Enhanced family leave policies (26 weeks paid maternity/adoption, 2 weeks paid paternity/partner)
• Shared parental leave (up to 24 weeks at full pay)
• Up to five additional days leave for caring responsibilities (two paid)
• Primary annual professional institution subscription
• Opportunities for technical and soft skills development (mentoring, formal training, self-development)

About the Company

• Mott MacDonald is a global engineering, management, and development consultancy with over 20,000 employees across more than 50 countries and 140+ offices.
• We work across incredible global industries, delivering exciting work that is defining our future and making an important societal impact in the communities we serve.
• Our people power our performance – we succeed when they do.
• With countless opportunities to collaborate, learn, and grow, the possibilities for excellence are as varied as every individual.
• Whether you want to grow as a subject matter expert or broaden your experience with roles across our international community, you’re surrounded by global specialists who want to combine their expertise and champion you to be your best.
• As a proudly employee-owned business, we benefit our clients, our communities, and each other, investing in creating the right space for everyone to feel empowered, included, and valued.
• Whatever your ambition, Mott MacDonald is where people come to be brilliant.
• The Water Utilities Division is Mott MacDonald’s centre of excellence for responding to the UK and Ireland's water and wastewater challenges.
• The work we do is at the forefront of ensuring safe water supplies for future generations, preventing urban flooding, and improving the health of our rivers and coastal environments.
• Our multi-disciplinary teams provide a variety of services throughout the full project life cycle, from advisory services and feasibility studies to outline and detailed design.
• Together, we deliver best-in-class solutions to our clients while offering diverse and technically stimulating opportunities to our people.

Equal Opportunity

• We put equality, diversity, and inclusion at the heart of our business, seeking to promote fair employment procedures and practices to ensure equal opportunities for all.
• We encourage individual expression in our workplace and are committed to creating an inclusive environment where everyone feels they can contribute.