Nitrogen mineralisation and greenhouse gas emission from the soil application of sludge from reed bed mineralisation systems

B Gómez-Muñoz, Julie Dam Larsen, G Bekiaris, Charlotte Scheutz, S Bruun, S Nielsen, L. S. Jensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A sludge treatment reed bed system (STRB) is a technology used for dewatering and stabilising sewage sludge via assisted biological mineralisation, which creates a sludge residue suitable for use as fertiliser on agricultural land. We evaluated the effect of sludge residue storage time (stabilisation time) for three STRBs on soil N mineralisation and CO2 and N2O emissions in soil. The experiment revealed that the N mineralisation rate and emissions of CO2 and N2O decreased as a function of treatment time in the STRBs. Mixed sludge residue (sludge residue subjected to different treatment times) for the three STRBs resulted in N mineralisation rates similar to the sludge residue subjected to a shorter treatment time but lower N2O emissions similar to the values of the older sludge residue. This finding reveals that combining fresh and more stabilised sludge residue ensures high N availability and reduces N2O emissions when applied to land.
Original languageEnglish
JournalJournal of Environmental Management
Volume203
Issue numberPart 1
Pages (from-to)59-67
Number of pages9
ISSN0301-4797
DOIs
Publication statusPublished - 2017

Keywords

  • C mineralisation
  • Mineralisation systems
  • N mineralisation
  • N(2)O and CO(2) emissions
  • Recycling of organic waste
  • Sewage sludge treatment

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