SENIOR PROCESS SYSTEMS ENGINEER

AquaGreen; Ballerup Kommune; On-site; DKK 850,000 - 1,100,000; Full time

Job summary

AquaGreen seeks a Senior Process Systems Engineer to analyse, understand, and optimise our integrated steam drying and pyrolysis plants. The role sits at the intersection of process design and plant operation, focusing on mass and energy balances, process dynamics, and safe, efficient operation.

You will translate technical understanding into clear control philosophies, support automation with functional design specifications, and work closely with mechanical, installation, and commissioning

Qualifications

• PhD/MSc/BSc in Chemical/Process/Mechanical Engineering with thermal focus.
• Experience in energy plants, process control, and industrial operation.
• Strong understanding of process dynamics and control across industrial systems.

Responsibilities

• Develop deep understanding of the integrated steam drying and pyrolysis plants and their control strategies.
• Lead process design alignment with automation as Process Lead.
• Analyse and optimise process dynamics for stability and performance.
• Translate process understanding into high-level control philosophies with the automation team.
• Document process control logic and functional descriptions for automation implementation.
• Identify bottlenecks and improvements in plant stability and energy efficiency.
• Collaborate with engineering and service to translate analysis into site improvements.

Skills

Thermochemical processes

Process dynamics

Industrial plants

Data interpretation

Control strategies

Automation interface

Plant operation

Mass & energy balance

Analytical thinking

Education

PhD or MSc

Chemical/Process Eng

Energy Eng

Thermal engineering

Job description

AquaGreen is an impact-driven Danish CleanTech company and a leader in advanced drying and pyrolysis technology for biosolids. Our ambition is to become the global leader in carbon-negative and energy-neutral conversion of biosolids into biochar. Our patented solutions reduce environmental pollutants, enable recycling of scarce nutrients, store carbon in biochar, and create sustainable value for wastewater utilities worldwide. We are currently building the foundation for rapid international scaling supported by strong global investors.

The Position

We are seeking a Senior Process Systems Engineer to analyse, understand, and optimise the process performance of our integrated steam drying and pyrolysis plants. The role sits at the intersection of process design and plant operation in a complex thermochemical processing system.

At the core of the role is a deep command of the plant\'s mass and energy balances – not only on paper, but as they behave in real plant operation. You will analyse operational data, develop and maintain mass and energy balances, understand process dynamics, and translate this understanding into safe, stable, and efficient plant operation – including the control strategies that support it.

Programming of the control logic is handled by the automation team; your key contribution is the process understanding and the functional documentation – process descriptions, sequence logic, and Functional Design Specifications (FDS) – that enables the automation team to implement it, working closely with other functions such as mechanical engineering and the installation & commissioning team.

Your Primary Responsibilities

• Develop a deep understanding of the process in our integrated steam drying and pyrolysis plants, including the interaction between: the overall mass balance, heat and energy flows, process parameters and plant control strategies.
• Participate in development projects, both conceptual and sub-system, as Process Lead, ensuring alignment between process design and automation.
• Analyse and optimise process dynamics, identifying factors that influence plant stability, operability, and performance.
• Translate process understanding into clear, high-level control philosophies and regulation strategies together with the automation team.
• Contribute to the definition and documentation of the process control and subsequent functional control logic in collaboration with the automation team, including: control and regulation strategies; process sequences and operational states; alarm strategies and operational logic; interlocks and safety functions where relevant.
• Analyse operational data to identify bottlenecks, operational constraints, and improvements in plant stability, energy efficiency, gas and biochar production, and overall plant capacity.
• Work closely with the engineering and service team to translate analysis into practical improvements in plant operation on site.
• Contribute to the design and evaluation of process development, modifications and improvements, including within current development areas: flue gas cleaning, return water cleaning, combustion and pyrolysis, sludge drying, and biochar.

Professional Qualifications

• Strong understanding of industrial process plants and thermochemical processes.
• Hands-on experience with energy or process plants is essential.
• Deep understanding of dynamic mass and energy balances, and how they behave under real operating conditions.
• Experience with or strong understanding of: process dynamics and control; the interface between process engineering and automation systems; ability to analyse and interpret operational data from industrial process plants; good working understanding of control systems and process control logic; ability to define and document control strategies and functional logic for the automation team to implement.
• A track record of applying process knowledge to deliver stable and efficient plant operation.
• Strong analytical and systems-level thinking.

Education and Background

The position requires strong theoretical process understanding combined with a practical interest in industrial plant operation – you are keen to go to sites to understand the plant dynamics in detail. You will typically hold:

• A relevant educational background, e.g. PhD, MSc, BSc or similar, in fields such as Chemical Engineering, Process Engineering, Energy Engineering, Mechanical Engineering with specialization in thermal systems.
• Experience with energy plants, or the process industry is essential. In addition, experience with the following is a plus: thermochemical processes (pyrolysis and/or gasification); industrial process control and plant operation; process simulation tools, digital twins, AI tools or similar; wastewater treatment; upstream sludge handling; emission control.

Above all, we are looking for someone who can make complex process systems legible – and turn that insight into stable and efficient plant operation.

What Success Looks Like After 12 Months

• Within the first year, you will have built and documented a solid command of our plants – how they behave, what drives performance, and where the control levers are.
• Understand and work actively with the mass and energy balances of the process across our plants and projects.
• Identify the key process parameters governing plant performance.
• Have played a key role in producing and documenting control philosophy and functional description that the automation team is actively implementing.
• Establish strong collaboration with the automation team around implementation of control strategies.
• Be a recognised process authority that engineering, automation, and operations teams turn to for process questions.
• Have initiated or delivered at least one concrete improvement to plant stability, energy efficiency, throughput, or control, with a measurable effect on performance.

We Offer

• A central technical role in an innovative technology company.
• The opportunity to work with advanced process engineering in a unique pyrolysis plant.
• A high degree of professional autonomy and the opportunity to influence the development of the plant.
• Close collaboration with engineering, operations, projects, and management.
• A highly dynamic and energised scale-up environment, where the process from idea to decision is short and efficient.
• Salary and employment terms commensurate with experience and qualifications.

Application

Hiring Manager and Contact person: Rune Skovgaard-Petersen, Chief Technology Officer, [e-mail], [phone]

We will continually review incoming applications during August; the deadline is 24 August, after which the selection and interview process will take place.

Engineered for long-term carbon sequestration

HECLA® Setores (Sewage to Resources) transforms biosolids management by turning wastewater sludge into a valuable carbon-rich resource. The integrated steam-drying and pyrolysis solution enables wastewater treatment plants to produce high-value biochar while permanently sequestering carbon.

Integrated steam-drying and pyrolysis technology

Get in touch

To discuss how our proven, automated solution can benefit your wastewater treatment plant, contact our team today.