Wastewater treatment process using immobilized microalgae.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Water Science and Technology Pub Date : 2024-08-01 Epub Date: 2024-08-14 DOI:10.2166/wst.2024.283
Ihana Aguiar Severo, Otto Gustavo de Avila Azevedo, Paulo Alexandre Silveira da Silva, Beatriz Jacob-Furlan, André Bellin Mariano, Juan C Ordonez, José Viriato Coelho Vargas
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Abstract

Microalgae biomass products are gaining popularity due to their diverse applications in various sectors. However, the costs associated with media ingredients and cell harvesting pose challenges to the scale-up of microalgae cultivation. This study evaluated the growth and nutrient removal efficiency (RE) of immobilized microalgae Tetradesmus obliquus in sodium alginate beads cultivated in swine manure-based wastewater compared to free cells. The main findings of this research include (i) immobilized cells outperformed free cells, showing approximately 2.3 times higher biomass production, especially at 10% effluent concentration; (ii) enhanced organic carbon removal was observed, with a significant 62% reduction in chemical oxygen demand (383.46-144.84 mg L-1) within 48 h for immobilized cells compared to 6% in free culture; (iii) both immobilized and free cells exhibited efficient removal of total nitrogen and total phosphorus, with high REs exceeding 99% for phosphorus. In addition, microscopic analysis confirmed successful cell dispersion within the alginate beads, ensuring efficient light and substrate transfer. Overall, the results highlight the potential of immobilization techniques and alternative media, such as biodigested swine manure, to enhance microalgal growth and nutrient RE, offering promising prospects for sustainable wastewater treatment processes.

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使用固定微藻的废水处理工艺。
微藻生物质产品因其在各行各业的广泛应用而越来越受欢迎。然而,与培养基成分和细胞收获相关的成本给微藻的规模化培养带来了挑战。与游离细胞相比,本研究评估了在猪粪废水中培养的海藻酸钠珠中固定化微藻 Tetradesmus obliquus 的生长和营养物质去除效率(RE)。这项研究的主要发现包括:(i) 固定化细胞的表现优于游离细胞,生物量产量高出约 2.3 倍,尤其是在污水浓度为 10%的情况下;(ii) 固定化细胞对有机碳的去除能力增强,在 48 小时内化学需氧量(383.46-144.84 mg L-1)显著降低 62%,而游离细胞的去除率仅为 6%;(iii) 固定化细胞和游离细胞对总氮和总磷的去除率都很高,磷的去除率超过 99%。此外,显微分析证实,细胞成功地分散在藻酸盐珠内,确保了光和基质的有效传输。总之,研究结果凸显了固定化技术和替代介质(如生物发酵猪粪)在促进微藻生长和营养物质可再生利用方面的潜力,为可持续废水处理工艺提供了广阔的前景。
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来源期刊
Water Science and Technology
Water Science and Technology 环境科学-工程:环境
CiteScore
4.90
自引率
3.70%
发文量
366
审稿时长
4.4 months
期刊介绍: Water Science and Technology publishes peer-reviewed papers on all aspects of the science and technology of water and wastewater. Papers are selected by a rigorous peer review procedure with the aim of rapid and wide dissemination of research results, development and application of new techniques, and related managerial and policy issues. Scientists, engineers, consultants, managers and policy-makers will find this journal essential as a permanent record of progress of research activities and their practical applications.
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