Effects of solids retention times on electro-selective fermentation using Scenedesmus acutus biomass,Sustainable Energy & Fuels

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Effects of solids retention times on electro-selective fermentation using Scenedesmus acutus biomass
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-09-07 , DOI: 10.1039/d0se00930j
Yuanzhe Liu _{1,

2,

3,

4} , Yen-Jung Sean Lai _{1,

2,

3,

4} , Bruce E. Rittmann _{1,

2,

3,

4}

Affiliation

Electro-Selective Fermentation (ESF) is a means to enhance lipid wet extraction from microalgal biomass. The Solids Retention Time (SRT) is a decisive factor for maximizing lipid extraction and recovery, and effective ESF treatment requires a minimum SRT that needs to be determined. The hydraulic retention time (HRT) was manipulated to control the SRT in ESF treating Scenedesmus acutus biomass, since the HRT was almost equal to the SRT in our ESF experiments. An ESF process that started with a ∼6 d SRT achieved high lipid extractability, but with relatively low lipid recovery. Shortening the SRT to ∼2 d yielded slightly lower extractability, but nearly 100% lipid recovery and much higher volumetric productivity, compared to the 6 d SRT. Starting with an ∼2 d SRT yielded much less extractable lipid production that did not increase after the SRT was extended to 6 d in a later stage. Microbial community analysis revealed lingering active fermenters when the SRT switched from long to short, but short to long SRT flushed out fermenters at first, although the fermenters were able to modestly recover after going back to the longer SRT. Thus, starting ESF with a longer SRT was important for selecting a microbial community able to achieve high lipid extractability, even though the subsequent shorter HRT achieved the highest production rate.

中文翻译：

固形物保留时间对尖头Scene鱼生物质电选择发酵的影响

电选择性发酵（ESF）是一种增强从微藻生物质中湿提取脂质的方法。固体保留时间（SRT）是最大程度地提取脂质和回收脂质的决定性因素，有效的ESF治疗需要确定最低的SRT。操纵水力停留时间（HRT）来控制ESF治疗a鱼的SRT生物量，因为在我们的ESF实验中HRT几乎等于SRT。以〜6 d SRT开始的ESF过程实现了较高的脂质提取能力，但脂质回收率相对较低。与6 d SRT相比，将SRT缩短至约2 d会产生略低的可萃取性，但脂质回收率接近100％，体积生产率要高得多。从〜2 d开始，SRT产生的可提取脂质的产量要少得多，但在随后的阶段将SRT延长至6 d后，产量没有增加。微生物群落分析显示，当SRT从多变短时，活跃的发酵罐仍会挥之不去，但是从短到长的SRT最初会冲走发酵罐，尽管发酵罐在回到较长的SRT之后能够适度恢复。从而，

更新日期：2020-09-29

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