Performances of full-scale biological nitrogen pre-treatment process for drinking water source: Seasonal variations and microbial community.

Autor: Cheng HH; Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan., Hew YH; Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan., Wu YJ; Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan., Chen TY; Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan., Chiu YT; Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan., Chen LY; Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan., Lin TF; Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan; Sustainable Environment Research Laboratory (SERL), National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan., Whang LM; Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan; Sustainable Environment Research Laboratory (SERL), National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan. Electronic address: whang@mail.ncku.edu.tw.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2024 Aug; Vol. 362, pp. 142861. Date of Electronic Publication: 2024 Jul 15.
DOI: 10.1016/j.chemosphere.2024.142861
Abstrakt: This study investigated the performance of the full-scale unit over a two-year period to enhance nitrification efficiency and provide operational strategies. Results indicated that raw water quality from Donggan River was notably influenced by seasonal variations, particularly during dry and wet seasons, impacting the nitrification efficiency of the biological pretreatment process. Factors such as influent concentrations of ammonia and total Kjeldahl nitrogen were found to have significant effects on nitrification, with temperature and conductivity also showing correlations. The specific rate of ammonia removal was calculated to be approximately 0.1 kg-N/m 3 /d under the existing operational setup. Moreover, elevating dissolved oxygen levels above 4 mg/L was proposed to potentially boost ammonia oxidation based on findings from experiments conducted in lab-scale bioreactors. In times of increased influent ammonia levels, the elimination of about 1-3 mg-N/L of total nitrogen signified the activation of denitrification processes. This observation was corroborated by results from next-generation sequencing techniques, verifying the existence of denitrifying microorganisms. The real-time PCR analysis results indicated that the abundance of comammox amoA gene was comparable with the abundance of the AOB amoA gene, indicating the presence of comammox Nitrospira and their potential role on nitrification in the system.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier Ltd.)
Databáze: MEDLINE
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