Application of endospore-forming Bacillus species to food waste-recycling wastewater treatment: A focus on the fate of macromolecular nutrients

Kyu Won Seo, Man Bock Gu, Yiu Fai Tsang, Yong Su Choi, Jaeshik Chung

Research output: Contribution to journalArticlepeer-review

Abstract

A novel bioprocess for treating high-strength food waste-recycling wastewater (FRW) by using endospore-forming bacteria was developed and evaluated under various hydraulic retention times (HRTs) and sequentially decreasing dissolved oxygen (DO) concentrations. Four Bacillus species (i.e., B. subtilis, B. licheniformis, B. mycoides, and B. thuringiensis) were added to the laboratory-scale system operated for 200 days and fed with an influent of 30 g·BOD/L. The dominance of endospore-forming bacteria was achieved (> 65%) by adding Bacillus species, which decomposes macromolecular nutrients such as carbohydrates, proteins, and lipids. Longer HRT in the aerobic reactor led to a higher removal rate of organic matter, whereas endospore-forming bacteria were clearly identified in the anoxic reactor; the observed removal efficiency of carbohydrates, lipids, proteins, nitrogen, and phosphorus were 99.4%, 94.0%, 87.6%, 81.3%, and 91.4%, respectively, throughout the sequential aerobic-anaerobic reactors. The results show that the proposed system using endospore-forming Bacillus bacteria could be an effective alternative for high-strength FRW treatment.

Original languageEnglish
Article number107584
JournalJournal of Environmental Chemical Engineering
Volume10
Issue number3
DOIs
Publication statusPublished - 2022 Jun

Keywords

  • Bacillus species
  • Endospore-forming bacteria
  • Food waste-recycling wastewater
  • Macromolecular nutrients
  • Microbial community structure

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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