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Gas production from dredged sediment.

Julia Gebert1, Christian Knoblauch2, Alexander Gröngröft2

  • 1Delft University of Technology, Department of Geoscience & Engineering, Stevinweg 1, 2628 CN Delft, the Netherlands.

Waste Management (New York, N.Y.)
|February 27, 2019
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Summary

Gas production from dredged sediment landfills is significant. Total nitrogen content strongly correlates with gas potential, suggesting it can predict total gas generation.

Keywords:
DegradabilityGas potentialLandfillLong-term incubationOrganic matterSediment

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Area of Science:

  • Environmental Engineering
  • Geotechnical Engineering
  • Waste Management

Background:

  • Anaerobic degradation of sediment organic matter generates gas in sediment constructions and landfills.
  • Gas production can compromise mechanical stability and necessitate gas extraction and treatment.
  • Limited data exists on gas generation from dredged sediments, hindering accurate modeling.

Purpose of the Study:

  • To quantify the residual gas potential of dredged sediments in a landfill.
  • To identify material properties influencing gas generation.
  • To improve gas production modeling for dredged material waste.

Main Methods:

  • Sampling of eleven waste layers from a mono-landfill for contaminated dredged sediment.
  • Long-term laboratory incubation experiment (757 days) to measure gas generation.
  • Correlation analysis of gas potential with material properties (e.g., total nitrogen, organic matter fractions).

Main Results:

  • Residual gas potential ranged from 2 to 12 m³ MgDW⁻¹, with 3-11% of organic matter degraded.
  • Gas potential correlated positively with total nitrogen (TN) content and negatively with the TOC/TN ratio.
  • Organic matter was primarily in the heavy density fraction (>1.4 g/cm³), with stronger correlation between gas potential and heavy fraction nitrogen.

Conclusions:

  • Total nitrogen content in dredged sediments can serve as a reliable proxy for estimating total gas potential.
  • Long-term gas potential significantly exceeds short-term measurements, necessitating updated modeling parameters.
  • Understanding gas generation is crucial for managing contaminated dredged sediment landfills effectively.