Abstract

Microalgae have received considerable attention in recent years due to their significant potential in contaminants removal from wastewater and can be used as a sustainable feedstock for biofuel production. However, existing researches on microalgae are mainly focused on inorganic nutrients (i.e., nitrogen and phosphorus) removal, while oil as one of the major pollutant classes has been lack of study. Therefore, the present work was aimed to use microalgae to remove oil in wastewater and for simultaneous lipid production. In this study, variables such as ozone flowrate, oil concentration, amount of microalgae seeds and cultivation pH value were introduced to optimize the oil removal efficiency and lipid yield. The optimized parameters that resulted the highest oil removal percentage (41.56%) were as follows: 0.4 L/min of ozone flowrate, 3 mL/L of oil concentration, 200 mL/L of microalgae seeds and cultivation pH value of 3 to 5. Under this condition, the lipid content embedded within the microalgae cells was 41.5% and mainly consisted of unsaturated fatty acids. The present results affirmed the capability of microalgae to remove oil from wastewater and could produce higher lipid yield from the metabolized oil.

Graphic abstract

中文翻译：

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使用微藻在废水和脂质生产中同时除油的潜力

摘要

近年来，由于微藻具有从废水中去除污染物的巨大潜力，因此受到了相当大的关注，可以用作生物燃料生产的可持续原料。然而，目前对微藻的研究主要集中在去除无机营养物（即氮和磷）上，而作为主要污染物类别之一的油却缺乏研究。因此，目前的工作旨在使用微藻去除废水中的油并同时生产脂质。在这项研究中，引入了诸如臭氧流量，油浓度，微藻种子数量和培养pH值等变量来优化除油效率和脂质产量。导致最高除油率（41.56％）的优化参数如下：臭氧流量0.4 L / min，油浓度为3 mL / L，微藻种子为200 mL / L，培养pH值为3-5。在此条件下，微藻细胞内的脂质含量为41.5％，主要由不饱和脂肪酸组成。目前的结果证实了微藻从废水中去除油的能力，并且可以从代谢油中产生更高的脂质产量。

图形摘要