Leachates treatment relies on the adoption of a multi-barrier strategy, involving primary, secondary, and tertiary processes. Due to their ability to grow in a wide variety of environmental conditions, and their nutritional requirements, especially in terms of nitrogen and phosphorus, microalgae appear as a promising alternative for the tertiary treatment of landfill leachates. Despite these advantages, only a few studies have promoted landfill leachates treatment using microalgae, most of them emphasizing the need for effluent dilution in water to minimize the toxicity and high color/turbidity of these effluents. An option to avoid the use of freshwater for effluent dilution would be the development of novel photobioreactors (PBRs), able to improve light absorption and, hence, light utilization efficiency by microalgae. This study evaluated the potential of Chlorella vulgaris and Tetradesmus obliquus on nitrogen (in the forms of nitrate and nitrite) removal from pre-treated landfill leachate. Preliminary experiments using different concentrations of the pre-treated leachate were carried out in 1-L flasks. These results have shown that microalgal growth and nitrogen removal were higher in more diluted conditions. After selection of the adequate effluent concentration, a tubular PBR coupled to an optical reflector was used for biomass production. This innovative PBR is known to improve light distribution along the tube perimeter, enhancing microalgal photosynthetic activity. In fact, a significant improvement in C. vulgaris biomass productivities and nitrogen species removal efficiencies was observed in this PBR, confirming its potential as an effective platform for microalgal biomass production and tertiary treatment of landfill leachates.

渗滤液的处理依赖于采用多种屏障策略，涉及初级，二级和三级过程。由于它们在各种环境条件下的生长能力以及对营养的需求，特别是在氮和磷方面，因此微藻似乎是三重处理垃圾渗滤液的有前途的替代方法。尽管具有这些优点，但只有少数研究促进了使用微藻处理垃圾渗滤液的方法，其中大多数强调需要对废水进行稀释以最大程度地降低这些废水的毒性和高色/浊度。避免使用淡水进行废水稀释的一种选择是开发新型光生物反应器（PBR），该反应器可提高光吸收率，从而提高微藻的光利用效率。小球藻和斜生小球藻从预处理的垃圾渗滤液中去除氮（以硝酸盐和亚硝酸盐的形式）。在1升烧瓶中进行了使用不同浓度的预处理渗滤液的初步实验。这些结果表明，在更稀释的条件下，微藻的生长和脱氮率更高。选择合适的废水浓度后，将连接到光学反射镜的管状PBR用于生产生物质。众所周知，这种创新的PBR可以改善沿管周边的光分布，增强微藻的光合活性。实际上，寻常念珠菌的显着改善 在该PBR中观察到了生物质生产力和氮物质去除效率，从而证实了其作为微藻生物质生产和垃圾渗滤液三级处理的有效平台的潜力。