Imperial College London, Department of Chemical Engineering, Exhibition Road, South Kensington, London SW7 2AZ, UK.
Imperial College London, Department of Chemical Engineering, Exhibition Road, South Kensington, London SW7 2AZ, UK.
Sci Total Environ. 2016 Oct 15;568:489-497. doi: 10.1016/j.scitotenv.2016.06.041. Epub 2016 Jun 16.
Hydrothermal Liquefaction (HTL) for algal biomass conversion is a promising technology capable of producing high yields of biocrude as well as partitioning even higher quantity of nutrients in the aqueous phase. To assess the feasibility of utilizing the aqueous phase, HTL of Nannochloropsis sp. was carried out in the temperature range of 275 to 350°C and Residence Times (RT) ranging between 5 and 60min The effect of reaction conditions on the NO3(-),PO4(3-),SO4(2-),Cl(-),Na(+),andK(+) ions as well as Chemical Oxygen Demand (COD) and pH was investigated with view of recycling the aqueous phase for either cultivation or energy generation via Anaerobic Digestion (AD), quantified via Lifecycle Assessment (LCA). It addition to substantial nutrient partitioning at short RT, an increase in alkalinity to almost pH10 and decrease in COD at longer RT was observed. The LCA investigation found reaction conditions of 275°C/30min and 350°C/10min to be most suitable for nutrient and energy recovery but both processing routes offer environmental benefit at all reaction conditions, however recycling for cultivation has marginally better environmental credentials compared to AD.
水热液化（HTL）用于藻类生物质转化是一种很有前途的技术，能够产生高产量的生物原油，同时将更多的营养物质分配到水相中。为了评估利用水相的可行性，在温度范围为 275 至 350°C 和停留时间（RT）在 5 至 60 分钟之间对 Nannochloropsis sp. 进行了 HTL。研究了反应条件对 NO3(-)、PO4(3-)、SO4(2-)、Cl(-)、Na(+)和 K(+)离子以及化学需氧量（COD）和 pH 的影响，以期通过厌氧消化（AD）回收水相用于培养或发电，通过生命周期评估（LCA）进行量化。除了在短 RT 下大量分配营养物质外，还观察到在较长 RT 下碱度增加到几乎 pH10 和 COD 降低。LCA 研究发现，275°C/30min 和 350°C/10min 的反应条件最适合于营养物和能量回收，但两种处理路线在所有反应条件下都具有环境效益，然而，与 AD 相比，回收用于培养具有略微更好的环境信誉。
