The growth and nutrient removal properties of a newly isolated Desmodesmus sp. XNY-2104 under mixotrophic and heterotrophic conditions using volatile fatty acids (VFAs)

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2025-05-01 DOI:10.1016/j.biombioe.2025.107918

Jie Li , Na Liu , Wenbao Yan , Qi Zhao , Xinglong Zhou , Cong Jia , Chongqing Xu , Xiaozhe Song , Mingming Song

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Abstract

To tackle the issues of high production costs and low lipid rates in large-scale microalgae lipid production, we investigated a new approach that uses volatile fatty acids (VFAs) in wastewater from anaerobic fermentation to provide a carbon source for cultivation. A newly isolated Desmodesmus sp. XNY-2104 showed promising results for cost reduction and water pollution mitigation in mixotrophic and heterotrophic conditions. The influence of diverse ratios of VFAs under mixotrophic and heterotrophic conditions on microalgal growth, nitrogen, phosphorus removal, and lipid accumulation were intensively investigated. The ratios for the acetic acid: propanoic acid: butyric acid (AA: PA: BA) were 8:1:1, 7:1:2, 7:2:1, 7:3:0, 6:1:3, 6:3:1, and 5:4:1. The study found that the best culture condition for XNY-2104 was a heterotrophic conditions with 8:1:1 VFAs ratio. This condition resulted in higher nitrogen and phosphorus removal, as well as higher lipid content, with rates of 99.86 %, 99.28 %, and 38.63 %, respectively. Using VFAs from anaerobic fermentation wastewater as a carbon source to cultivate microalgae is an effective method for achieving a win-win situation between waste utilization and bioenergy production.

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混合营养和异养条件下新分离桥单孢菌XNY-2104的生长和利用挥发性脂肪酸去除营养物的特性

为了解决大规模微藻产脂成本高、产脂率低的问题，我们研究了一种利用厌氧发酵废水中的挥发性脂肪酸（VFAs）为培养提供碳源的新方法。新分离到的桥单霉sp. XNY-2104在混合营养和异养条件下具有降低成本和减轻水污染的良好效果。在混合营养和异养条件下，研究了不同比例的VFAs对微藻生长、氮、磷去除和脂质积累的影响。乙酸：丙酸：丁酸（AA: PA: BA）的配比分别为8:1:1、7:1:2、7:2:1、7:3:0、6:1:3、6:3:1和5:4:1。研究发现，XNY-2104的最佳培养条件为VFAs比为8:1:1的异养条件。该条件对氮、磷和油脂的去除率分别达到99.86%、99.28%和38.63%。利用厌氧发酵废水中的VFAs作为碳源培养微藻，是实现废弃物利用与生物能源生产双赢的有效途径。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.