Micro-Polluted Surface Water Treated by Yeast-Chitosan Bio-Microcapsules

Liu, Xiao; Lin, Wang; Shi, Jun

doi:10.3390/ma13163519

Cited by 2 publications

(1 citation statement)

References 51 publications

(70 reference statements)

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“…This may be attributable to the complexity of sewage composition, which may hinder microbial osmoregulation and impede intracellular enzymatic activity, thereby exerting irreversible effects on strain growth and metabolism. In the later stages, enhancing the denitrification capacity of strain HS2 can be achieved through techniques such as the encapsulation of the microorganism in biopolymeric microcapsules along with organic substrates [ 46 , 47 ]. Additionally, the co-cultivation of fungi and bacteria could be employed to augment the denitrification efficiency of sewage [ 48 ].…”

Section: Discussionmentioning

confidence: 99%

Denitrification Characteristics of the Low-Temperature Tolerant Denitrification Strain Achromobacter spiritinus HS2 and Its Application

Gao,

Zhang,

et al. 2024

Microorganisms

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The low-temperature environment significantly inhibits the growth and metabolism of denitrifying bacteria, leading to an excessive concentration of ammonia nitrogen and total nitrogen in sewage treatment plants during the cold season. In this study, an efficient denitrifying strain of heterotrophic nitrification–aerobic denitrification (HN–AD) bacteria named HS2 was isolated and screened from industrial sewage of a chemical factory in Inner Mongolia at 8 °C. The strain was confirmed to be Achromobacter spiritinus, a colorless rod-shaped bacterium. When cultured with sodium succinate as the carbon source, a carbon-to-nitrogen ratio of 20–30, a shaking rate of 150–180 r/min, and an initial pH of 6–10, the strain HS2 exhibited excellent nitrogen removal at 8 °C. Through the results of whole-genome sequencing, gene amplification, and gas product detection, the strain HS2 was determined to possess key enzyme genes in both nitrification and denitrification pathways, suggesting a HN–AD pathway of NH4+-N → NH2OH → NO2−N → NO → N2O → N2. At 8 °C, the strain HS2 could completely remove ammonia nitrogen from industrial sewage with an initial concentration of 127.23 mg/L. Microbial species diversity analysis of the final sewage confirmed Achromobacter sp. as the dominant genus, which indicated that the low-temperature denitrifying strain HS2 plays an important role in nitrogen removal in actual low-temperature sewage.

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Section: Discussionmentioning

confidence: 99%