Codisposal of municipal refuse, sewage sludge and marine dredgings for methane production

Y. S.G. Chan*, L. M. Chu, Ming Hung WONG

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

13 Citations (Scopus)


As marine disposal of sewage sludge and dredged sediments may impose serious adverse effects to marine ecosystems, landfilling seems to be the most feasible method for the final disposal of these wastes. A batch experiment was conducted to study waste degradation and gas production after sewage sludge and marine dredgings were mixed with municipal refuse at 13 different ratios for 36 days. The addition of sludge and dredgings to municipal refuse enhanced gas production, compared with the degradation of refuse or sludge alone. A proper mixing ratio of wastes can also shorten the time to reach the final phase of anaerobiosis. The highest gas production was obtained from the ratio of 75-20-5 (refuse-sludge-dredgings) (wet weight basis). Its average daily gas production rate was 1.42 1 kg-1 waste mixture; methane content was 68.3%. The results indicated that codisposal of the three wastes would be beneficial for energy recovery from landfill gas.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalEnvironmental Pollution
Issue number1
Publication statusPublished - Jul 1999

Scopus Subject Areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

User-Defined Keywords

  • Biogas production
  • Codisposal
  • Marine dredgings
  • Methane
  • Municipal refuse
  • Sewage sludge


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