Bactericidal and virucidal mechanisms in the alkaline disinfection of compost using calcium lime and ash

Nowaki Hijikata, Rui Tezuka, Shinobu Kazama, Masahiro Otaki, Ken Ushijima, Ryusei Ito, Satoshi Okabe, Daisuke Sano, Naoyuki Funamizu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

In the present study, the bactericidal and virucidal mechanisms in the alkaline disinfection of compost with calcium lime and ash were investigated. Two indicator microorganisms, Escherichia coli and MS2 coliphage, were used as surrogates for enteric pathogens. The alkaline-treated compost with calcium oxide (CaO) or ash resulted primarily in damage to the outer membrane and enzyme activities of E. coli. The alkaline treatment of compost also led to the infectivity loss of the coliphage because of the partial capsid damage and RNA exteriorization due to a raised pH, which is proportional to the amount of alkaline agents added. These results indicate that the alkaline treatment of compost using calcium oxide and ash is effective and can contribute to the safe usage of compost from a mixing type dry toilet.

Original languageEnglish
Pages (from-to)721-727
Number of pages7
JournalJournal of Environmental Management
Volume181
DOIs
Publication statusPublished - 2016 Oct 1
Externally publishedYes

Keywords

  • Alkaline disinfection
  • Ash
  • Calcium oxide
  • Compost
  • Dry toilet
  • Pathogen

ASJC Scopus subject areas

  • Environmental Engineering
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

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