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Conversion of high-ash microalgae through hydrothermal liquefaction
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-03-17 , DOI: 10.1039/c9se01114e Huihui Liu 1, 2, 3, 4 , Yingquan Chen 1, 2, 3, 4 , Haiping Yang 1, 2, 3, 4 , Francesco G. Gentili 5, 6, 7, 8 , Ulf Söderlind 8, 9, 10, 11 , Xianhua Wang 1, 2, 3, 4 , Wennan Zhang 8, 9, 10, 11 , Hanping Chen 1, 2, 3, 4
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-03-17 , DOI: 10.1039/c9se01114e Huihui Liu 1, 2, 3, 4 , Yingquan Chen 1, 2, 3, 4 , Haiping Yang 1, 2, 3, 4 , Francesco G. Gentili 5, 6, 7, 8 , Ulf Söderlind 8, 9, 10, 11 , Xianhua Wang 1, 2, 3, 4 , Wennan Zhang 8, 9, 10, 11 , Hanping Chen 1, 2, 3, 4
Affiliation
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Natural microalgae (NM, Scenedesmus) cultivated by utilization of exhaust gas from a municipal solid waste combustion power plant were used for the biofuel production through hydrothermal liquefaction (HTL). The high-ash NM underwent acid-washing to obtain deashing microalgae (DA). HTL experiments were carried out at different temperatures from 260 °C to 340 °C with NM and DA. Products derived from NM and DA were examined by various techniques in order to identify the influence of the ash on the hydrothermal decomposition behavior. The results show that the ash inhibits the transformation of microalgae. The bio-oil yield including heavy oil and light oil is in the range of 17.59–22.09% for NM and 24.30–31.14% for DA, respectively. Calcium carbonate in the ash promotes deamination, resulting in an increase in the relative content of ketones in the NM-derived light oil. The concentration of NH4+ in the aqueous phase derived from NM is in the range of 1373–1860 mg L−1, and PO43− is undetected due to the precipitation reaction between phosphorus and calcium ions. The HHV values of NM-derived hydrochars are low, ranging from 8.83 MJ kg−1 to 9.88 MJ kg−1, compared with those of DA-derived hydrochars,. For natural microalgae, the deashing pretreatment before HTL is of great significance for improving the biocrude yield and quality, as well as the biomass conversion efficiency, nitrogen utilization and the hydrochar quality.
中文翻译：
通过水热液化转化高灰分微藻
天然微藻（NM，Scenedesmus利用来自城市固体废物燃烧发电厂的废气进行栽培的）被用于通过水热液化（HTL）进行生物燃料生产。对高灰分的NM进行酸洗以获得脱灰微藻（DA）。使用NM和DA在260°C至340°C的不同温度下进行了HTL实验。为了确定灰分对水热分解行为的影响，通过各种技术检查了来自NM和DA的产品。结果表明，灰分抑制了微藻的转化。NM的生物油产率（包括重油和轻油）分别在17.59-22.09％和DA的24.30-31.14％之间。灰分中的碳酸钙促进脱氨作用，导致NM衍生的轻质油中酮的相对含量增加。来自NM的水相中的4 +范围为1373–1860 mg L -1，并且由于磷和钙离子之间的沉淀反应而未检测到PO 4 3-。与DA衍生的炭相比，NM衍生的炭的HHV值较低，介于8.83 MJ kg -1至9.88 MJ kg -1。对于天然微藻而言，在HTL之前进行除灰预处理对于提高生物粗品的产量和质量以及生物质转化效率，氮利用和水炭质量具有重要意义。
更新日期：2020-03-17
中文翻译：
通过水热液化转化高灰分微藻
天然微藻（NM，Scenedesmus利用来自城市固体废物燃烧发电厂的废气进行栽培的）被用于通过水热液化（HTL）进行生物燃料生产。对高灰分的NM进行酸洗以获得脱灰微藻（DA）。使用NM和DA在260°C至340°C的不同温度下进行了HTL实验。为了确定灰分对水热分解行为的影响，通过各种技术检查了来自NM和DA的产品。结果表明，灰分抑制了微藻的转化。NM的生物油产率（包括重油和轻油）分别在17.59-22.09％和DA的24.30-31.14％之间。灰分中的碳酸钙促进脱氨作用，导致NM衍生的轻质油中酮的相对含量增加。来自NM的水相中的4 +范围为1373–1860 mg L -1，并且由于磷和钙离子之间的沉淀反应而未检测到PO 4 3-。与DA衍生的炭相比，NM衍生的炭的HHV值较低，介于8.83 MJ kg -1至9.88 MJ kg -1。对于天然微藻而言，在HTL之前进行除灰预处理对于提高生物粗品的产量和质量以及生物质转化效率，氮利用和水炭质量具有重要意义。
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