Department of Chemical Engineering and Environmental Technology, Valladolid University, Dr. Mergelina, s/n, 47011 Valladolid, Spain.
Department of Biodiversity and Environmental Management, University of León, 24071 León, Spain.
Bioresour Technol. 2015 Sep;191:173-86. doi: 10.1016/j.biortech.2015.04.125. Epub 2015 May 7.
Algal-bacterial symbiosis, implemented in an innovative anoxic-aerobic photobioreactor configuration with biomass recycling, supported an efficient removal of total organic carbon (86-90%), inorganic carbon (57-98%) and total nitrogen (68-79%) during synthetic wastewater treatment at a hydraulic and sludge retention times of 2 days and 20 days, respectively. The availability of inorganic carbon in the photobioreactor, determined by its supply in the wastewater and microalgae activity, governed the extent of nitrogen removal by assimilation or nitrification-denitrification. Unexpectedly, nitrate production was negligible despite the high dissolved oxygen concentrations, denitrification being only based on nitrite reduction. Biomass recycling resulted in the enrichment of rapidly settling algal flocs, which supported effluent total suspended solid concentrations below the European Union maximum discharge limits. Finally, the maximum nitrous oxide emissions recorded were far below the emission factors reported for wastewater treatment plants, confirming the environmental sustainability of this innovative photobioreactor in terms of global warming impact.
在创新的缺氧-好氧光生物反应器配置中，通过生物质循环实现了藻菌共生，在水力停留时间和污泥停留时间分别为 2 天和 20 天时，支持了合成废水处理中总有机碳（86-90%）、无机碳（57-98%）和总氮（68-79%）的有效去除。光生物反应器中无机碳的可用性由废水中的供应和微藻活性决定，控制着同化或硝化-反硝化去除氮的程度。出乎意料的是，尽管溶解氧浓度很高，但硝酸盐的产生可以忽略不计，反硝化仅基于亚硝酸盐还原。生物质循环导致快速沉降的藻类絮体富集，从而使出水总悬浮固体浓度低于欧盟的最大排放限值。最后，记录到的最大氧化亚氮排放量远低于报告的污水处理厂的排放因子，证实了这种创新的光生物反应器在全球变暖影响方面具有环境可持续性。
