Biofiltration of WWTP sludge composting emissions at contact times of 2-10 s by structured/unstructured packing materials

Antonio D. Dorado, David Gabriel, Xavier Gamisans

    Research output: Contribution to journalArticleResearchpeer-review

    6 Citations (Scopus)

    Abstract

    © 2015 Elsevier Ltd. All rights reserved. The performance of a biotrickling filter for the abatement of composting emissions was evaluated at short gas contact times of 2-10 s with a structured and an unstructured packing material. The effect of the gas contact time, pH control and water make-up flowrate were also evaluated during 8 months. The average elimination capacity was 13 g N m<sup>-3</sup> h<sup>-1</sup> and 3.3 g C m<sup>-3</sup> h<sup>-1</sup> for NH<inf>3</inf> and VOCs, respectively. Maximum capacities obtained during an inlet concentration spiking experiment were 45 g N m<sup>-3</sup> h<sup>-1</sup> and 20 g C m<sup>-3</sup> h<sup>-1</sup> at a removal efficiency of 92.5 and 46.7%, respectively. A decrease of 40% was detected in the nitrification capacity when the hydraulic residence time increased from 2 to 5 h. Thus, water renewal was identified as a critical parameter to avoid substrate inhibition by nitrite and NH<inf>3</inf> accumulation. Results demonstrate that significant NH<inf>3</inf> and VOCs removal efficiencies can be achieved for composting emissions in a biotrickling filter operated at short gas contact times, which entails a substantial reduction of operational and investment costs in comparison to traditional techniques.
    Original languageEnglish
    Pages (from-to)1405-1412
    JournalProcess Biochemistry
    Volume50
    Issue number9
    DOIs
    Publication statusPublished - 22 Jul 2015

    Keywords

    • Biotrickling filtration
    • Composting emissions
    • NH&lt;inf&gt;3&lt;/inf&gt; and volatile organic compounds
    • Packing materials
    • Short gas contact times
    • Spiking

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