Food waste treatment by anaerobic co-digestion with saline sludge and its implications for energy recovery in Hong Kong

Jonathan W C WONG*, Guneet KAUR, Sanjeet Mehariya, Obulisamy Parthiba Karthikeyan, Guanghao Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Potential of methane production by co-digestion of food waste with saline sludge produced from sewage receiving seawater toilet flushing was investigated to determine its suitability for food waste management in Hong Kong by making use of excess design capacity of sludge digesters. High salinity of saline sludge (12.8 mS/cm) affected degradation of organic compounds resulting in an increase in sCOD by 135% as compared to an increase by 283% in treatments with non-saline sludge (4.2 mS/cm) co-digestion. This inhibitory effect was also evident by lower VS removal efficiency of 32.65% for saline versus 54.23% for non-saline sludge based co-digestion. Furthermore, non-saline sludge gave a 3.4-fold higher methane yield than saline sludge co-digestion. It is concluded that co-digestion of food waste with both sludges could be adopted as a potential strategy to make use of excess digestion capacity of existing wastewater treatment facilities but is more viable for non-saline sludge.

Original languageEnglish
Pages (from-to)824-828
Number of pages5
JournalBioresource Technology
Volume268
DOIs
Publication statusPublished - Nov 2018

Scopus Subject Areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

User-Defined Keywords

  • Anaerobic co-digestion
  • Methanogenesis
  • Salinity
  • Sewage sludge

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