Application of microbubble air flotation to harvest Microcystis sp. from agriculture wastewater: The regulation and mechanisms

IF 3.5 2区 生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Biotechnology and Bioengineering Pub Date : 2024-09-09 DOI:10.1002/bit.28836
Jianfeng Ye, Zhihao Zhu, Zhaofeng Song, Huiting Xu, Tianchen Xu, Hui Liu
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Abstract

The harvesting of microalgae is the main bottleneck of its large-scale biomass production, and seeking an efficient, green, and low-cost microalgae harvesting technology is one of the urgent problems to be solved. Microbubble air flotation has been proven to be an effective measure, but the mechanisms of microbubbles-algal cell attachment are still unclear. In this study, microbubble air flotation was used as a harvesting method for Microcystis cultured in agricultural wastewater. The process mechanism of microbubble air flotation harvesting microalgae in wastewater was fully revealed from three aspects (the design of bubble formation, the adhesion law, and the recovery rate of microalgae under different working conditions). The results show that the length of the release pipe is the main factor affecting the proportion of microbubbles with a particle size of less than 50 μm. In the process of adhesion, when the particle size of microbubbles is 0.6–1.7 times the size of Microcystis, the adhesion efficiency of microbubbles to Microcystis is the highest. Under the conditions of pressure 0.45 MPa, gas–liquid ratio 5%, and release pipe length 100 cm, the harvesting performance of Microcystis was the best. Microbubble air flotation has better harvesting performance (63.5%, collection rate) of Microcystis with higher density. By understanding the mechanism of microbubble flotation, the technical parameters of microbubble flotation for harvesting energy microalgae are optimized to provide support for the development of efficient and low-cost devices and equipment for collecting microalgae.
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应用微气泡气浮收获农业废水中的微囊藻:调节和机制
微藻收获是大规模生物质生产的主要瓶颈,寻求一种高效、绿色、低成本的微藻收获技术是亟待解决的问题之一。微气泡气浮已被证明是一种有效的措施,但微气泡-藻细胞附着的机理仍不清楚。本研究采用微气泡气浮作为农业废水中培养的微囊藻的收获方法。从气泡形成设计、附着规律和不同工况下微囊藻回收率三个方面全面揭示了微气泡气浮收获废水中微囊藻的过程机理。结果表明,释放管的长度是影响粒径小于 50 μm 的微气泡比例的主要因素。在粘附过程中,当微泡粒径为微囊藻粒径的 0.6-1.7 倍时,微泡对微囊藻的粘附效率最高。在压力为 0.45 兆帕、气液比为 5%、释放管道长度为 100 厘米的条件下,微囊藻的收获效果最好。微气泡气浮对密度较大的微囊藻有较好的收获效果(收集率为 63.5%)。通过对微泡气浮机理的认识,优化了微泡气浮收获能源微藻的技术参数,为开发高效、低成本的微藻收集装置和设备提供了支持。
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来源期刊
Biotechnology and Bioengineering
Biotechnology and Bioengineering 工程技术-生物工程与应用微生物
CiteScore
7.90
自引率
5.30%
发文量
280
审稿时长
2.1 months
期刊介绍: Biotechnology & Bioengineering publishes Perspectives, Articles, Reviews, Mini-Reviews, and Communications to the Editor that embrace all aspects of biotechnology. These include: -Enzyme systems and their applications, including enzyme reactors, purification, and applied aspects of protein engineering -Animal-cell biotechnology, including media development -Applied aspects of cellular physiology, metabolism, and energetics -Biocatalysis and applied enzymology, including enzyme reactors, protein engineering, and nanobiotechnology -Biothermodynamics -Biofuels, including biomass and renewable resource engineering -Biomaterials, including delivery systems and materials for tissue engineering -Bioprocess engineering, including kinetics and modeling of biological systems, transport phenomena in bioreactors, bioreactor design, monitoring, and control -Biosensors and instrumentation -Computational and systems biology, including bioinformatics and genomic/proteomic studies -Environmental biotechnology, including biofilms, algal systems, and bioremediation -Metabolic and cellular engineering -Plant-cell biotechnology -Spectroscopic and other analytical techniques for biotechnological applications -Synthetic biology -Tissue engineering, stem-cell bioengineering, regenerative medicine, gene therapy and delivery systems The editors will consider papers for publication based on novelty, their immediate or future impact on biotechnological processes, and their contribution to the advancement of biochemical engineering science. Submission of papers dealing with routine aspects of bioprocessing, description of established equipment, and routine applications of established methodologies (e.g., control strategies, modeling, experimental methods) is discouraged. Theoretical papers will be judged based on the novelty of the approach and their potential impact, or on their novel capability to predict and elucidate experimental observations.
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