High-rate stabilization and associated air emissions prospected during on-site in-vessel sewage sludge composting

Shlomi Oazana, Vempalli S. Varma, Ibrahim Saadi, Dayanand Sharma, Aviva Hanan, Shlomit Medina, Ran Avidov, Yosef Grinshpon, Lavi Rosenfeld, Amit Gross, Yael Laor

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

On-site in-vessel composting of sewage sludge is considered to be applied in Israel for peripheral wastewater treatment plants (WWTPs). Based on lab-scale simulations using municipal sewage sludge and green waste, this study identifies a prospective range of values related to biomass stabilization during short-term processing. Within two weeks, 26–30% of the initial organic carbon was released as CO2, potential heat formation was decreased by 73–82%, and odor emissions by 87–99.5%. This reduction was mainly associated with co-decrease of NH3, dimethyl disulfide, and dimethyl trisulfide. Phytotoxicity was reduced by 28–52% whereas some residual toxicity might be attributed to non-biodegradable inorganic compounds. Stabilization rates observed in flexibly controlled lab-scale simulations can represent closed and efficiently aerated large-scale industrial systems. These prospective ranges of stabilization parameters are critical for deciding on the necessity of a curing stage for on-site enclosed installations in WWTPs.

Original languageEnglish
Article number100543
JournalBioresource Technology Reports
Volume11
DOIs
StatePublished - 1 Sep 2020

Keywords

  • Accelerated intense degradation phase
  • Composting simulator
  • Large-scale
  • Rotary drum
  • Self-heating
  • Temperature-feedback control

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