Using ozone nanobubbles, and microalgae to promote the removal of nutrients from aquaculture wastewater: Insights from the changes of microbiomes.

Autor: Yang Z; School of Marine Sciences, Ningbo University, Ningbo, 315211, China., Wang Y; Ningbo Academy of Oceanology and Fishery, Ningbo, 315048, China. Electronic address: wangyangcai@126.com., Lukwambe B; School of Aquatic Sciences and Fisheries Technology, University of Dar es Salaam, Tanzania., Nicholaus R; Department of Natural Sciences, Mbeya University of Science and Technology, Tanzania., Yang W; School of Marine Sciences, Ningbo University, Ningbo, 315211, China., Zhu J; School of Marine Sciences, Ningbo University, Ningbo, 315211, China., Zheng Z; School of Marine Sciences, Ningbo University, Ningbo, 315211, China. Electronic address: zhengzhongming@nbu.edu.cn.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2024 Sep 15; Vol. 257, pp. 119349. Date of Electronic Publication: 2024 Jun 04.
DOI: 10.1016/j.envres.2024.119349
Abstrakt: Integrated aquaculture wastewater treatment systems (IAWTSs) are widely used in treating aquaculture wastewater with the aeration-microalgae unit serving as an important component. In this study, we artificially constructed an IAWTS and applied two aeration-microalgae methods: ordinary aeration or ozone nanobubbles (ONBs) with microalgae (Nannochloropsis oculata). The impact of N.oculata and ONBs on the removal performance of nutrients and the underlying micro-ecological mechanisms were investigated using 16S rRNA gene amplicon sequencing. The results demonstrated that the combined use of ONBs and N.oculata exhibited superior purification effects with 78.25%, 76.59% and 86.71% removal of COD Mn , TN and TP. N.oculata played a pivotal role as the primary element in wastewater purification, while ONBs influenced nutrient dynamics by affecting both N.oculata and bacterial communities. N.oculata actively shaped bacterial communities, with a specific focus on nitrogen and phosphorus cycling in the micro-environment remodeled by ONBs. Rare bacterial communities displayed heightened activity in response to the changes in N.oculata, ONBs, and nutrient levels. These findings provide a novel approach to improve the technological processes the IAWTS, contributing to the advancement of sustainable aquaculture practices by offering valuable insights into wastewater purification efficiency and micro-ecological mechanisms.
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 Inc. All rights reserved.)
Databáze: MEDLINE
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