Pursuing research on renewable energy is a key challenge in this century due to worldwide increase in energy demand and environmental issues associated with fossil fuel consumption. In this sense, microalgae have received considerable renewed attention to become a feedstock for large-scale biofuel production. However, high cost of large algal cultivation systems precludes it from currently being an economically viable option. In other words, to lower the cost, the harvestable biomass energy yield, which is a function of productivity, energy content and harvestability of biomass, must be maximized. Therefore, any practical method that could improve these parameters would be beneficial and contribute to enhancement of the biomass energy yield and is interesting for further consideration. Hence, this study aims to review parameters influencing the harvestable biomass energy yield in microalgal cultures particularly wastewater-fed cultures and to discuss the advantages and limitations of different practical strategies in order to promote low-cost energy production from microalgal cultures. Five practical strategies were considered: CO₂ addition, variation of hydraulic retention time, cultivation and dominance of colonial species, zooplankton control and algal recycling. Advantages and drawbacks of these parameters were assessed, and it is concluded that of these parameters, CO₂ addition and its combination with algal recycling have the higher impact on the enhancement of the harvestable biomass energy yield.

由于全球范围内能源需求的增长和与化石燃料消耗有关的环境问题，对可再生能源的研究是本世纪的主要挑战。从这个意义上讲，微藻类已受到相当多的重新关注，成为大规模生物燃料生产的原料。但是，大型藻类种植系统的高成本使其目前无法成为经济上可行的选择。换句话说，为了降低成本，必须最大化可收获的生物质能量产量，其是生产力，能量含量和生物质的可收获性的函数。因此，任何可以改善这些参数的实用方法将是有益的，并且有助于提高生物质能的产率，并且值得进一步考虑。因此，这项研究旨在审查影响微藻培养物，尤其是废水喂养的培养物中可收获的生物质能源产量的参数，并讨论各种实际策略的优势和局限性，以促进微藻培养物低成本生产能源。考虑了五个实用策略：CO₂另外，水力滞留时间的变化，殖民地物种的培养和优势，浮游动物的控制和藻类的再循环。评估了这些参数的优缺点，得出的结论是，在这些参数中，CO _2的添加及其与藻类循环的结合对提高可收获生物质能源产量具有更高的影响。