Plants That Keep Working.
Design, construction, and maintenance of process plants for wastewater treatment and biodegradable organic materials. Every solution is based on our own laboratory analyses and pilot-scale testing.
From your very first message to your initial meeting, you’ll always speak directly with a member of our team, not a salesperson or intermediary. No obligations. No automated replies.
We Design Based on Data,
Not Assumptions
CROTEH provides comprehensive solutions for investment projects, from the initial project concept and preliminary designs, through feasibility studies and EU funding applications, to the preparation of project documentation, obtaining the required permits, and construction supervision or engineering services for the construction of process plants.
Our approach is built on real laboratory analyses and a seamless continuum from design to long-term support, significantly reducing investment risk and ensuring reliable plant performance. We don’t design from spreadsheets, and we don’t hand projects off to third parties. Every key stage is handled by our own team, from the first laboratory sample to plant servicing years after commissioning.
In-House Laboratory
Our accredited Ecotechnology Laboratory enables us to base every solution on real analyses of your samples – not assumptions. Before the design phase begins, we have a complete understanding of your material’s characteristics.
- HAA Accreditation · HRN EN ISO/IEC 17025
- Physical, chemical, and biological analyses
- Pilot-Scale Validation Before Construction
One Team
Your project stays in the same hands from start to finish. The team that develops and designs your plant is the same team that oversees construction, commissions the system, and provides continuous technical support throughout its entire service life.
- Multidisciplinary in-house team
- Continuity throughout every project phase
- Round-the-clock technical support
Custom-Made Solutions
Industrial wastewater streams with variable composition and high pollutant loads require tailored solutions, not off-the-shelf designs. Our extensive experience with projects of this kind ensures stable and reliable plant operation.
- ISO 9001:2015 certifikat
- Namjenska rješenja za industrijske otpadne tokove
- Procjedne vode sa odlagališta / obrade otpada
- Proizvodnja bioplina / biometana iz organskih otpadnih tokova
Vendor-Neutral Engineering
Equipment selection is based solely on actual process requirements.
- Using components selected by the client to suit their specific requirements and budget, we design the optimal plant configuration.
- We do not represent individual equipment manufacturers.
PILOT TESTING
For more complex projects, we carry out laboratory-scale testing to validate the process concept and optimize process parameters before investment begins.
- Accurate sizing without costly equipment oversizing
- Reduced investment and process risk
- Optimized operating costs (OPEX) from the design stage
- Technical Documentation for Permits and EU Funding Applications
Engineering Solutions for Your Industry
Municipal Infrastructure
Food Processing & Agriculture
Meat Processing & Slaughterhouses
Energy & Biogas
Dairy Industry
Breweries & Wineries
From Development to Plant Optimization
Our engineers approach every project individually, taking into account each client’s specific requirements, regulatory obligations, and site conditions.
We develop and deliver plants based on detailed engineering carried out by our in-house engineering office and laboratory.
We place particular emphasis on process optimization, energy efficiency, and the ability to expand plant capacity in the future without requiring complex retrofits.
Solution Development
Our process solutions are developed using real data obtained through laboratory analyses and pilot-scale testing of actual samples. This significantly reduces the risk of incorrect system sizing and ensures optimal plant performance from day one.
System Flexibility
We place particular emphasis on system flexibility, enabling adaptation to future production changes, capacity increases, or more stringent environmental requirements without the need for complete plant reconstruction.
Integrated Management
Our design approach is based on integrated wastewater management, treating wastewater treatment as part of a broader resource management strategy that includes opportunities for water reuse and reducing overall freshwater consumption in industrial processes.
Plant Types
What Have We Designed So Far?
We specialize in the design of wastewater treatment plants (WWTPs) for all types of wastewater, as well as waste management projects and industrial process optimization.
Every solution is based on real analyses conducted in our own laboratory, enabling precise system sizing and reliable plant performance from day one.
Wastewater Treatment
Municipal Wastewater Treatment Plants (WWTPs)
Treatment of wastewater from households, public sewerage networks, and municipal wastewater systems.
Industrial Wastewater Treatment Plants (WWTPs)
Specialized engineering solutions for the dairy, brewing, meat processing, and food industries.
Landfill Leachate Treatment Plants
Treatment of landfill leachate and composting facility leachate – high-strength wastewater with variable composition.
TREATMENT OF ORGANIC WASTE STREAMS
Biogas & Biomethane Plants
From initial substrate analysis and anaerobic process development to optimization, plant construction, and commissioning.
Composting Facilities
Aerobic treatment of organic waste and industrial-scale compost production.
Mechanical-Biological Waste Treatment (MBT)
Preparation of waste management projects, with particular expertise in mechanical-biological treatment (MBT) technologies for municipal and non-hazardous industrial waste.
OTHER PROJECT TYPES
Industrial Process Plant Optimization
Optimization of existing industrial process plants to improve efficiency and reduce overall operating costs.
Sorting Facilities
Design of waste sorting facilities and systems for preparing secondary raw materials for recycling.
Recycling Centers
Design of recycling centers for the collection and sorting of waste for local self-government units.
Plant Upgrades
Modernization and upgrades of existing plants built by other contractors to improve performance and ensure regulatory compliance.
OUR PROCESS
From Sample to Commissioning – in 10 Steps
Every stage is handled by our team. Each project begins in our own accredited laboratory – we design only what we have first measured and validated.
Our process is organized into four logical phases that cover the entire plant lifecycle, from the first sample to long-term operation after commissioning.
Sampling of Real-World Materials
- Sampling at the client’s site
- Analyses in our accredited laboratory
- Assessment of seasonal and shift variations
Sampling of Real-World Materials
- Sampling at the client’s site
- Analyses in our accredited laboratory
- Assessment of seasonal and shift variations
Design & Permitting
- Conceptual, detailed, and construction design
- Feasibility studies
- Coordination with the relevant authorities
Plant Engineering and Installation
- Turnkey delivery
- Equipment procurement, supply, and installation
- Integration of automation and control systems
Construction Supervision
- Technical and professional construction supervision
- Quality control of workmanship and equipment
- Project progress monitoring
Commissioning & Staff Training
- Phased commissioning with continuous parameter monitoring
- Preparation of operating manuals
- Professional training for the client’s personnel
Post-Commissioning Testing
- Plant functionality testing
- Verification of design parameters
- Effluent quality verification
Service & Maintenance
- Preventive and corrective maintenance
- Round-the-clock technical support
- Extending equipment service life
Operation Monitoring & Control
- SCADA/PLC automation systems
- Continuous parameter monitoring
- Reduced energy and chemical consumption
Continuous Optimization
- Fine-tuning of operating parameters
- Adaptation to new conditions and regulations
- Reduction of operating costs over the years
What We Deliver
TECHNICAL DOCUMENTATION - Deliverables Overview
Every project results in a complete set of technical documentation. Here’s what our engineers deliver at each stage of the project.
We adapt the documentation format to the requirements of each project – from documentation required for building permits under Croatian regulations to EPC-standard documentation for international investors.
Process Flow Diagram
Material, equipment, and energy flows
Process Instrumentation Diagram
Detailed piping layout including instruments and valves
Material and Energy Balance
The basis for sizing every process plant
Equipment Specifications
Technical specifications for the procurement of equipment and machinery
Instrument Data Sheets
Technical data sheets for measurement and control instrumentation
Equipment Layout
Plant layout showing the spatial arrangement of the plant, including the relative positions of equipment and buildings
Piping Isometric Drawings
Detailed drawings for the installation of piping systems
Bill of Quantities for Works and Equipment
Basis for tender documentation and contract preparation
Fabrication Drawings
Drawings for the fabrication of custom equipment and steel structures
Automation Design
Functional descriptions, I/O lists, system architecture, and control systems
Operating and Maintenance Instructions
Manuals for the safe and efficient operation of the plant
As-Built Records
Documentation updated to reflect the plant as actually constructed
Types of Project Documentation
From Concept to As-Built Documentation
We prepare all levels of project documentation in accordance with Croatian legislation, with mapping to international EPC standards.
Feasibility Study
A techno-economic evaluation of alternative solutions, including a recommendation for the optimal technology. Forms the basis for investment decisions and applications for EU funding.
- Analysis of alternative solutions
- Techno-economic comparison
- Investment study
- Recommendations for further development
Basic Engineering Design (BED) / Conceptual Design
A conceptual design including a process flow diagram, preliminary equipment sizing, and estimates of capital and operating costs.
- Process Flow Diagram (PFD)
- Material and Energy Balance
- Preliminary Equipment Layout
- Capital Cost Estimate
Front-End Engineering Design (FEED)
Comprehensive documentation for obtaining a building permit, covering process, civil, electrical, and mechanical engineering.
- Piping and Instrumentation Diagram (P&ID)
- Equipment and Instrument Specifications
- Plant Layout
- Building Permit Supporting Documentation
Construction Design
Detailed technical documentation for construction, equipment procurement, and installation. Forms the basis for the construction and engineering phase.
- Piping Isometric Drawings
- Fabrication Drawings
- Bills of Quantities (BoQ)
- Installation and Operating Instructions
Obtaining Permits
Active coordination with the competent authorities to obtain building permits, environmental permits, Environmental Impact Assessment (EIA) approvals, and Integrated Environmental Permits (IEP).
- Building Permit
- Environmental Permit
- Environmental Impact Assessment (EIA)
- Integrated Environmental Permit (IEP)
EU Funding Application Packages
Preparation of complete documentation for applications to EU funding programs, including technical studies and reports compliant with European Commission requirements.
- EU Funding Application Packages
- Technical Studies for the European Commission
- Cost–Benefit Analysis (CBA)
- Documentation Prepared in Accordance with EU Standards
THE PROJECT IS COMPLETE – WHAT’S NEXT?
Project documentation is a standalone service. You can use it with any contractor or continue working with us through the next project phases.
Engineering and Installation
