Consulting and engineering for waste treatment and recovery infrastructures

Designing the environmental infrastructures for tomorrow

The transition to a circular economy requires efficient, safe and sustainable infrastructure capable of transforming waste into resources, energy or secondary raw materials.

ZEnergy Consulting supports public and private actors in the development, design, optimization and implementation of complex environmental projects, in France and internationally.

Our expertise covers the entire life cycle of projects, from feasibility studies to commissioning of installations, integrating technical, economic, environmental and regulatory issues.

Our areas of intervention

Waste to Energy

Incineration of household waste
Hazardous waste treatment
Incineration of sludge from water treatment
Optimization of combustion and energy recovery

Recycling and circular economy

Recycling of lithium-ion batteries
Recycling of plastics (PE films, PET bottles)
Valorization of secondary materials
Development of innovative recycling sectors

Biological treatment

Methanization and anaerobic digestion
Biogas valorization
Biowaste treatment

Treatment of industrial residues

Fly ash stabilization (APCR)
Treatment of combustion residues
Management of industrial by-products

Engineering and project management

We are involved in all phases of project development:

Studies and design

APS, APD studies
Pre-FEED and FEED
Engineering review at 30%, 60% and 90%
Design Validation
Assistance to project management (AMO)
Technical assistance to project managers

Procurement & Tendering

Development of forecast budgets
Preparation of EPC and Design-Build Packages files
Analysis and evaluation of offers
Technical clarifications
Assistance with contractual negotiations

Project execution

EPC, MOE and suppliers coordination
Management of technical interfaces
Manufacturing and construction monitoring
Commissioning and start-up assistance
Performance optimization (ramp-up)

Multidisciplinary technical expertise

Industrial processes

Process design and optimization
Material and energy balances
Energy recovery
Flue gas treatment
Selection of anti-corrosion materials
High performance refractories

Industrial equipment

Grate incinerators and rotary kilns
Heat recovery steam generators (HRSG / Recovery boilers)
Flue gas treatment (dry, wet, SCR)
Overhead cranes
Conveyors and handling systems
Silos, tanks, exchangers and pressure vessel
Industrial utilities

Security and Compliance

Fire protection
Process safety
Analysis of industrial risks
Operation and maintenance guides

Due Diligence and Asset Acquisition

We carry out technical audits and due diligence within the framework of:

Acquisitions of industrial assets
Investments in environmental infrastructure
Modernization or extension projects
Performance and regulatory compliance assessments

Our approach helps identify technical risks, future investment needs and opportunities for performance improvement.

Techno-economic optimization

Our expertise combines technical performance and value creation.

We support our clients in:

CAPEX / OPEX trade-off analysis
Life-cycle cost optimization of facilities
Improving equipment availability
Increasing energy efficiency
Reduction of operating and maintenance costs

Innovation and continuous improvement

Innovation is at the heart of our approach through active participation in working groups and continuous improvement methodologies:

Design Thinking
Design to Cost
Design to Value
Technical standardization
Development of industrial best practices

This approach allows us to integrate Best Available Techniques (BAT) while ensuring strict control over costs and risks.

Our industrial successes

🔥 Optimization of Combustion & Durability of Refractory Materials

The Challenge: Premature degradation of refractory linings in a hazardous waste incineration rotary kiln led to significant production losses and high recurring maintenance costs.

The Impact: As a refractory materials expert, I co-led an international multidisciplinary task force. We improved material selection, detailed engineering, quality control during installation and drying, as well as daily combustion control.

The Results: A major improvement in asset profitability. Standardizing these best practices reduced procurement costs by 20% and cut breakdown-related downtime losses by 30%, generating a direct financial impact of €2 million per year for the group.

⚡ Turnaround of an Energy Transition Project: Biomass & Cogeneration

The Challenge: Acted as a consulting project engineer for EPC contractor Le Gaz Intégral to get a strategic biomass pyrogasification (animal meal) and power generation plant back on track (ATEMAX in St Langis-Lès-Mortagne, Normandy). The project faced a critical two-year delay due to complex technical obstacles..

The Impact: Audited the entire design and restructured the interface engineering between functional packages to restore operational progress:

Alignment & System Engineering: Review and validation of the functional analyzes of each package (gasifier, oxidizer, waste heat boiler, flue gas treatment, steam turbine) and development of the overall functional analysis of the plant (PFD, cause and effect matrices, control logic diagrams), coordination of the programming of the DCS system, as well as verification of the conformity of the isometric plans with the process diagrams (P&ID).
Commissioning & Peformance Test Planning: Designed the full commissioning program, including hydrostatic testing of pressure equipment (boiler, piping), safety loops, refractory dry-out and firing procedures, boil-out and passivation, steam blowing, and performance test.
Operating Deliverables: Writing global operating manuals (O&M) and updating technical documentation to secure transfer to operating teams.

The Results: Fully resolved interface conflicts and eliminated uncertainties regarding key procedures (clarifying and parallelizing start-up/shut-down sequences). Secured the project timeline toward first fire and provided the end customer with a clear, comprehensive operating model for plant acceptance following commissioning.

Why choose ZEnergy Consulting?

Recognized expertise in environmental infrastructure
International experience in complex project management
Deep knowledge of energy recovery and recycling technologies
Integrated approach covering technical, economic, and regulatory dimensions
Optimization of environmental and industrial performance
Support across the entire project life cycle—from initial concept to operation

Our mission

To contribute to the development of efficient, sustainable, and economically viable environmental infrastructures capable of meeting the challenges of energy transition, the circular economy, and responsible resource management.