Greenhouse gas emissions from a sewage contact oxidation emergency treatment plant after destruction by an earthquake and tsunami

Wei Kang Qi, Ying Song, Yongzhen Peng, Yu You Li

Research output: Contribution to journalArticlepeer-review

Abstract

Emissions of greenhouse gases (GHGs) from a full-scale contact oxidation emergency sewage treatment plant (STP) in Japan that was damaged by an earthquake and a tsunami were measured. The open chamber (OC) and closed chamber (CC) methods were used to sample the gases emitted in the aeration tank and the settler, respectively. The dissolved gases were measured using the headspace method, and the major emissions sources in wastewater treatment were identified. The results indicated that the GHG emissions from the wastewater were 58.6 g-CO2/m3 (equivalent per cubic meter of wastewater). The CH4 emissions showed a strong negative correlation with the dissolved oxygen (DO) content. More than 98% of the GHGs were produced and stripped by the aeration tank. The CO2, CH4 and N2O emissions accounted for 73.0% (21,781 mL/m3), 17.1% (669 mL/m3) and 9.9% (10.9 mL/m3), respectively, of all GHG emissions. Approximately 1.06% of the incoming chemical oxygen demand (COD) was emitted as CH4, and 0.147% of the removed nitrogen was emitted as N2O.

Original languageEnglish
Pages (from-to)634-641
Number of pages8
JournalScience of the Total Environment
Volume687
DOIs
Publication statusPublished - 2019 Oct 15

Keywords

  • Contact oxidation
  • Full-scale plant
  • Greenhouse gas
  • Sewage facility

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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