Operation of a landfill bioreactor in a cold climate: Early results and lessons learned

H. Hettiarachchi, J. P.A. Hettiaratchi, C. A. Hunte, Jay Meegoda

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

This manuscript presents a detailed discussion of the challenges faced and lessons learned during the initial phase of operation of the Calgary Biocell. The Calgary Biocell is a full-scale pilot project that has been implemented to acquire data and demonstrate the applicability of the biocell concept under severe winter conditions. The biocell concept involves operating a waste cell in three phases: first as an anaerobic bioreactor to recover biogas and produceenergy, second as an aerobic bioreactor or an in-ground composter, and finally mined to recover processed waste and land for reuse. The Calgary Biocell has been in operation in its first phase, as an anaerobic bioreactor, for over the past five years. The cell was equipped with sensors to gather performance data during anaerobic and aerobic bioreactor operation. The settlement, moisture content, pressure, and temperature sensors provided early data, but failed afterseveral months of cell operation. Regular monitoring and repairs were performed to ensure thatgas was captured and used to generate power. The waste settlement data were collected during waste placement and before final closure of the cell from various depths of the cell. Lift 1 reported approximately 700 mm of settlement, which is approximately 14% strain, when the biocellwas ready to be capped. After closure, only a limited amount of waste settlement data could becollected because of the failure of the settlement sensors and the real time data gathering system. The automated leachate recirculation system also failed during the past five years and was repaired. The liquid level of the leachate sump during automated operation was more consistent. The average initial and final moisture contents of MSW in the biocell were found to be at25 and 36%, respectively, whereas the field capacity was determined to be 44% (wet basis). Thetemperature of landfill gas leaving the biocell ranged between 3 and 12°C in the winter/springand approximately 20°C during summer. The landfill gas production rate averaged 59 m3=h, but dropped considerably during the winter months . .

Original languageEnglish (US)
Pages (from-to)307-316
Number of pages10
JournalJournal of Hazardous, Toxic, and Radioactive Waste
Volume17
Issue number4
DOIs
StatePublished - Sep 27 2013

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Water Science and Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal

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