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OBOMa – Online-Tool for Optimized Bunker Waste Mixing and Operational Management of Waste-to-Energy Plants

Waste-to-Energy plants are typically receiving a large variety of wastes with diverse combustion characteristics. Until recently no method was available to assess the degree of variability of the waste combusted and hence also no controlled mixing of the waste feed was possible. OBOMa presents the first tool to online monitor the mixing of the waste feed and to subsequently control and optimize it. Expected economic associated benefits with the application of OBOMa are in the range of 200,000 to 500,000 €/year.


We organize expert discussions about current topics in waste and resource management. Thereto we invite representatives from industry, academics, public authorities or NGOs into our “lounge” to discuss about challenges, achievements and future developments in different areas of waste and resource management.

Trashtalk #1: Circular Economy of Plastics

Trashtalk #2: The Fashion of Waste!

Trashtalk #3: Steel – Circularity at its best


Fossil Carbon Tracking System (FCTS ) - Highly accurate determination of fossil CO2

VIRWa together with Genius5-Instruments offer a novel methodology to precisely determine the fossil CO2 emissions from Waste-to-Energy plants.

The Fossil Carbon Tracking System (FCTS) combines established methods (Balance Method, Radiocarbon Method) and represents an highly accurate monitoring method for Waste-to-Energy plants.


You can only improve what you’ve taken the time to understand.

When you deepen your understanding of your system’s energy flows, greenhouse gas emissions and further lifecycle assessment impact categories, you uncover opportunities to avoid losses and efficiently meet emission targets. All this at a company, city, and regional level. Ready to improve your system? We know just the place to get started.


Use what you have, get what you need.

Use available data or collect new data. We will support you to do both efficiently. Getting the most out of your data is our passion and we use it vigorously to identify all of your optimization potential, whatever your circumstances. Where necessary, we’ll even guide you through bridging knowledge gaps.


Use our Tools and improve your System.

Together we will implement measures and tools to improve your performance in regard to environmental and economical performance.


Profit from our know-how:

  • Increase your efficiency
  • Reduce your environmental impact
  • Reduce your costs
  • Assess your improvement


Make use of this opportunity and profit also from our know how. Every system offers potential for optimization.

Course listing

Who We Are

The team of VIRWa has more than 40 years of experience in solid waste and resource management. Recent works have given special primarily focus on system-based analyses of wastes and resources, taking environmental impacts, such as climate change, resource depletion or soil and water contamination into account. Ultimately, every project is dedicated to finding the most cost-efficient way to reach the goals of solid waste management (protect humans and the environment), thereby pursuing multiple SDGs (Sustainable Development Goals) simultaneously.

Our Expertise

Analysis of waste processes and systems, waste management planning, assessment of greenhouse gas emissions (at different levels), analyzing and optimizing the operation of waste-to-energy plants, analysis of refuse-derived fuels (RDFs), design and evaluation of landfill aeration projects, evaluation of landfill aftercare, industrial waste management (industrial symbiosis), analysis of material cycles (such as steel or plastics), tracing of pollutants through systems (e.g., heavy metals, POPs).

More than 500 reports and scientific publications by Johann Fellner and Therese Schwarzböck

Wast incineracion plant Spittelau
Wast incineracion plant Spittelau


SUS Environment
Technische Universität Wien, TU Wien
Technische Universität Wien, TU Wien