This study evaluated the influence of nanoparticles in both suspension and solid format on the performance of a microalgal process devoted to photosynthetic biogas purification. The experimental system consisted of an enclosed tubular photobioreactor coupled to a biogas absorption column through a mixing chamber. The high NH4+ concentration in the inlet mineral medium (530 mg N-NH4+ L-1) and the punctual addition of 115 mL of nanoparticle suspension to the system caused inhibition of the microalgal-bacterial cultivation. Conversely, cultivation broth aeration (0.5 L min−1 air flowrate) allowed the biomethane production fulfilling the EN 16723 (CH4 > 90 %, CO2 < 2 %). The nanoparticle suspension performance was superior to that of their solid counterparts in terms of CO2 removal efficiency at equivalent nanoparticle dose (77 % vs. 49 %). However, parameters such as the nanoparticle suspension dosage and biomass concentration in the photobioreactor should be optimized to further improve biomethane quality before its industrial application.

中文翻译：

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通过工艺曝气和纳米颗粒补充改进光合沼气净化


本研究评估了悬浮和固体形式的纳米颗粒对专用于光合沼气净化的微藻过程性能的影响。该实验系统由一个封闭的管式光生物反应器组成，该反应器通过混合室与沼气吸收塔耦合。入口矿物培养基中的高 NH4+ 浓度 （530 mg N-NH4+ L-1） 和准时向系统中添加 115 mL 纳米颗粒悬浮液导致微藻细菌培养受到抑制。相反，培养液曝气（0.5 L min-1 空气流速）允许生物甲烷生产满足 EN 16723（CH4 > 90 %，CO2 < 2 %）。在等效纳米颗粒剂量下，纳米颗粒悬浮液的 CO2 去除效率优于固体颗粒悬浮液（77 % 对 49 %）。然而，在生物反应器工业应用之前，应优化光生物反应器中的纳米颗粒悬浮剂量和生物质浓度等参数，以进一步提高生物甲烷质量。