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The final objectives of the Task Group are twofold:

  • Understand the processes that are responsible for the major contributions to GHG emissions from WWTP and sewer systems (e.g. heterotrophic denitrification, autotrophic nitrification, autotrophic denitrification, methanogenesis, etc.)
  • Translate this knowledge into mathematical models that can be embedded in
    system/plant-wide models allowing multi-criteria optimisation

In order to achieve this, the following sub-objectives are embedded in a strategic overall
approach to tackle the problem:

  • Determine state-of-the-art, key players and ongoing projects in all scientific areas below; research gap identification: use existing facilitating channels like the Global Water Research Coalition (GWRC) as a means of coordination of research outputs from ongoing work, and providing research needs for future work
  • Basic research nitrogen GHGs: build consensus on process mechanisms (preferably
    assisted by process modeling) and GHG yields under different conditions
  • Model development nitrogen GHGs: translate research knowledge into mathematical
    models and embed them in ASM; design experiments needed for calibration of the
    additional model parameters; note that this needs close interaction with basic research
    (perhaps working through GWRC)
  • Basic research methane: quantify methane emissions in sewers and those fractions
    introduced into the WWTP via the sewer and digester reject water; quantify methane
    stripping in biological reactors
  • Model development methane: embed knowledge into ASM and hydraulic network
    models; design experiments needed for model calibration; note that this needs close
    interaction with basic research
  • Full-scale monitoring: what can be measured with which accuracy; identify cases for
    detailed GHG measurement campaigns
  • Plant-wide model – Benchmarking: full-scale model integration and calibration; multicriteria optimization strategy development, including modeling and ICA for
    minimizing N20, CH4, and indirect GHG emissions, as well as for maximizing CH4
    production in anerobic digestion; testing of control strategies using a benchmark
    approach extending the efforts of the current TG on Benchmarking of control
    strategies; and guidance on coupling with existing LCA tools

Page | by Dr. Radut