Larger hydroxyapatite aggregation from Ca 2+ adhesion in ANAMMOX granular sludge caused by high dissolved oxygen.

Autor: Yuan M; School of Environment, Harbin Institute of Technology, Harbin, 150090, China., Shan Q; School of Environment, Harbin Institute of Technology, Harbin, 150090, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China. Electronic address: qiushan@hit.edu.cn., Fu M; School of Environment, Harbin Institute of Technology, Harbin, 150090, China., Deng M; School of Environment, Harbin Institute of Technology, Harbin, 150090, China., Wang J; School of Environment, Harbin Institute of Technology, Harbin, 150090, China., Deng F; School of Environment, Harbin Institute of Technology, Harbin, 150090, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2024 Feb; Vol. 350, pp. 141158. Date of Electronic Publication: 2024 Jan 08.
DOI: 10.1016/j.chemosphere.2024.141158
Abstrakt: Anaerobic ammonia oxidation (ANAMMOX), a sustainable biological process, is promising to remove NH 4 + -N from municipal sewage. In this study, results showed that the anammox granular sludge morphology changes with the alternation of dissolved oxygen (DO), mainly attributing to the adhesion of calcium ions (Ca 2+ ) to the surface of sludge particles. Diverse characterization methods revealed that gray adhesions in the form of hydroxyapatite covered the original holes on the anammox granular sludge surface, including scanning Electron Microscopy (SEM), digital camera images, Energy Dispersive Spectrometer (EDS), and X-ray diffraction (XRD). Ex-situ degradation of NH 4 + -N and NO 2 - -N yielded diverse outcomes. The protein to polysaccharide ratio (PN/PS) in the total extracellular polymeric substances (EPS) across 4 size groups demonstrated a decrease under O 2 exposure. Microbial community analysis indicated norank_f_A4b and Nitrolancea being the most abundant genus under O 2 exposure at day 1 and day 100, respectively. These findings offer an effective strategy to prevent size-larger granular sludge from deteriorating through changing DO and Ca 2+ in municipal wastewater in ANAMMOX.
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 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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