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 language | English |
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Article number | 107584 |
Journal | Journal of Environmental Chemical Engineering |
Volume | 10 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2022 Jun |
Bibliographical note
Funding Information:This work was supported by the Korea Environment Industry & Technology Institute (KEITI) through the Subsurface Environment Management (SEM) Project ( 2021002470004 ) funded by the Korea Ministry of Environment ( MOE ), the National Research Foundation of Korea (NRF) through the ‘Climate Change Impact Minimizing Technology’ Program, funded by the Korean Ministry of Science and ICT( MSIT ) ( 2020M3H5A1080712 ). The authors also acknowledge the support from the Future Research Program ( 2E31261 ), funded by the Korea Institute of Science and Technology (KIST).
Publisher Copyright:
© 2022 Elsevier Ltd
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