Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
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DOI：
10.1016/j.algal.2012.02.002
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发表时间：
2012-05-01
影响因子：
5.1
通讯作者：
Llewellyn, C. A.
中科院分区：
文献类型：
--
作者：
Biller, P.;Ross, A. B.;Llewellyn, C. A.
新兴藻类生物燃料工业的两个主要考虑因素是藻类浆料的能量密集型脱水和营养管理。所提出的涉及来自微藻的水热液化的水相的营养物再循环的闭环过程为这两个方面提供了解决方案。水热液化已被证明是从微藻生产生物原油的低能量过程。为了本研究的目的，在300 ℃和350 ℃下在间歇式反应器中处理小球藻（Chlorella vulgaris）、栅藻（Scenedesmus dimmphus）和蓝细菌钝顶螺旋藻（Spirulina platensis）和菲氏绿胶藻（Chlorogloeopsis fritschii）的微藻菌株。液化后，分离产物相并回收水相。生物原油产率范围为27至47重量%。生物原油具有低的0和N含量和高的热值，使得它们适合于进一步加工。分析水相的所有主要营养物、TOC和TN，以确定再循环水相用于藻类培养的适用性。在标准生长培养基中对每种藻类菌株进行生长试验，并与再循环工艺水相的一系列稀释液中的生长速率进行比较。通过细胞计数和叶绿素a吸光度测定生长。生长发生在生长抑制剂量不太高的重稀释液中。结果表明，使用回收的水相的闭环系统为微藻的可持续石油生产和营养管理提供了一条有前途的途径。(C)2012爱思唯尔有限公司版权所有。
Two major considerations of the emerging algae biofuel industry are the energy intensive dewatering of the algae slurry and nutrient management. The proposed closed loop process which involves nutrient recycling of the aqueous phase from the hydrothermal liquefaction of microalgae offers a solution to both aspects. Hydrothermal liquefaction has been shown to be a low energy process for bio-crude production from microalgae. For the purpose of this research, microalgae strains of Chlorella vulgaris, Scenedesmus dimmphus and the cyanobacteria Spirulina platensis and Chlorogloeopsis fritschii were processed in batch reactors at 300 degrees C and 350 C. Following liquefaction the product phases were separated and the water phase recovered. The bio-crude yields ranged from 27 to 47 wt.%. The bio-crudes were of low 0 and N content and high heating value making them suitable for further processing. The water phase was analysed for all major nutrients, TOC and TN to determine the suitability of the recycled aqueous phase for algae cultivation. Growth trials were performed for each algae strain in a standard growth medium and compared to the growth rates in a series of dilutions of the recycled process water phase. Growth was determined by cell count and chlorophyll a absorbance. Growth occurred in heavy dilutions where the amount of growth inhibitors was not too high. The results show that the closed loop system using the recovered aqueous phase offers a promising route for sustainable oil production and nutrient management for microalgae. (C) 2012 Elsevier B.V. All rights reserved.