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

Authors
Seo, Kyu WonGu, Man BockTsang, Yiu FaiChoi, Yong-SuChung, Jaeshik
Issue Date
6월-2022
Publisher
ELSEVIER SCI LTD
Keywords
Bacillus species; Endospore-forming bacteria; Food waste-recycling wastewater; Macromolecular nutrients; Microbial community structure
Citation
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, v.10, no.3
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume
10
Number
3
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/141718
DOI
10.1016/j.jece.2022.107584
ISSN
2213-3437
Abstract
A novel bioprocess for treating high-strength food waste-recycling wastewater (FRW) by using endosporeforming 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.
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