Pastore Martina, Sforza Eleonora
Interdepartmental Centre Giorgio Levi Cases, Via Marzolo 9, 35131 Padova, Italy E-mail:
Water Sci Technol. 2018 Aug;78(1-2):216-224. doi: 10.2166/wst.2018.155.
The application of microalgal bacteria consortia to the treatment of wastewater is receiving increasing attention, meeting the demand for new green and efficient technologies for water remediation. The specificity of the consortium, however, may strongly affect the performance of the treatment. In fact, even though a general exploitation of the O/CO exchange between microalgae and bacteria is effective, some specific interactions may increase the pollutant removal. With this aim, the co-cultivation of Chlorella protothecoides and Brevundimonas diminuta was tested, with particular attention to the removal capability of nitrogen, phosphorus and chemical oxygen demand (COD) from wastewater. Batch experiments were carried out both for the consortium and, separately, for the bacteria and microalgae alone, in order to compare their performances. B. diminuta showed a remarkable capability for removing organic substances and transforming organic nitrogen to ammonium. C. protothecoides efficiently removed nitrogen and phosphorus. As the specific growth rates of the two organisms are different, the co-cultivation was also carried out also in a continuous system, and the effect of hydraulic retention time (HRT) on the steady-state biomass concentration and nutrient removal efficiency was verified. Residence time was found as the main operating variable for obtaining a significant reduction of pollutants from wastewater.
微藻-细菌联合体在废水处理中的应用正受到越来越多的关注，满足了对新型绿色高效水修复技术的需求。然而，联合体的特异性可能会强烈影响处理效果。事实上，尽管微藻和细菌之间普遍利用氧/碳交换是有效的，但一些特定的相互作用可能会提高污染物的去除率。为此，对原壳小球藻和短小鞘氨醇单胞菌进行了共培养测试，特别关注废水中氮、磷和化学需氧量（COD）的去除能力。对联合体以及分别对单独的细菌和微藻进行了批次实验，以比较它们的性能。短小鞘氨醇单胞菌表现出显著的去除有机物和将有机氮转化为铵的能力。原壳小球藻能有效去除氮和磷。由于两种生物的比生长速率不同，还在连续系统中进行了共培养，并验证了水力停留时间（HRT）对稳态生物量浓度和养分去除效率的影响。发现停留时间是实现废水中污染物显著减少的主要操作变量。
