High-rate CO2 sequestration using a novel venturi integrated photobioreactor and subsequent valorization to microalgal lipids,Green Chemistry

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High-rate CO2 sequestration using a novel venturi integrated photobioreactor and subsequent valorization to microalgal lipids
Green Chemistry ( IF 9.3 ) Pub Date : 2020-10-09 , DOI: 10.1039/d0gc02552f
Saptarshi Dey _{1,

2,

3,

4,

5} , Arghya Bhattacharya _{1,

2,

3,

4,

5} , Pushpendar Kumar _{1,

2,

3,

4,

5} , Anushree Malik _{1,

2,

3,

4,

5}

Affiliation

Recovery of waste CO₂ from flue gas involves two phase gas–liquid interactions for application in enhanced microalgal growth, CO₂ bio-fixation and increased production of microalgal lipids for 4^th generation biofuels. Mineralized CO₂ as bicarbonate between pH 10 and 7 constitutes the major inorganic carbon for phototrophic microalgae. Consolidating Carbon Capture and Usage (CCU) technology with microalgal lipid synthesis, the present work exhibits design and optimization of a microbubble assisted CO₂ sequestration reactor to recover CO₂ from low concentration sources (5% v/v) and maximize microalgal lipid productivity without any nutrient stress. A venturi microbubble generator was amalgamated with a bubble column and the Reynolds number was used to define the hydrodynamic flow regime. At a steady volumetric liquid flow rate Q_L, corresponding to laminar flow conditions, the gas flow rate Q_G was varied in the range 0.1–1 L min⁻¹ to determine the volumetric mass transfer coefficient K_La and the CO₂ mass transfer efficiency. K_La and Q_G values were found to be linearly dependent in the Q_G range 0.1–0.7 L min⁻¹, while CO₂ capture efficiencies in the range 86% to 98% were obtained. The optimized medium recirculation sufficed for culture agitation and further aeration for mixing was not required. A correlation coefficient was derived, relating the change in gas–liquid interfacial area with the change in Q_G. The resultant system achieved a biomass yield of 0.454 g L⁻¹ and a carbon content of 38.9% volatile suspended solids (VSS). Furthermore, a lipid accumulation of 35.9% on a dry cell weight basis and a lipid productivity of 11.64 mg L⁻¹ d⁻¹ exhibited feasible valorisation of sequestered carbon.

中文翻译：

使用新型文丘里管集成的光生物反应器进行高速率的二氧化碳隔离，随后将其价衡为微藻类脂质

废物CO的恢复₂从烟道气涉及增强微藻生长为应用两相气体-液体的相互作用，CO ₂生物固定和4个生产的微藻脂质的增加^第代生物燃料。pH 10和7之间的碳酸氢盐矿化的CO ₂构成了光养微藻类的主要无机碳。通过将碳捕获和利用（CCU）技术与微藻类脂质合成相结合，本工作展示了微气泡辅助CO ₂隔离反应器以回收CO _2的设计和优化。来自低浓度来源（5％v / v），并在没有任何营养胁迫的情况下最大程度地提高微藻脂质的生产率。文丘里管微气泡发生器与气泡柱合并，雷诺数用于定义流体动力流态。在与层流条件相对应的稳定的液体体积流量Q _L下，气体流量Q _G在0.1-1 L min ^-1的范围内变化，以确定体积传质系数K _L a和CO ₂传质效率。ķ_大号一个和Q _ģ发现值是线性相关的Q_G范围为0.1–0.7 L min^-1，而CO_2的捕集效率为86％至98％。优化的培养基再循环足以用于培养搅拌，并且不需要进一步通气以进行混合。推导了相关系数，将气液界面面积的变化与Q _G的变化相关。所得系统实现了0.454g L^-1的生物量产率和38.9％的挥发性悬浮固体（VSS）的碳含量。此外，以干细胞重量计，脂质积累为35.9％，脂质生产率为11.64 mg L^-1 d^-1，显示出可行的螯合碳价。

更新日期：2020-11-03

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