Evaluation of wastewater treatment in a novel anoxic-aerobic algal-bacterial photobioreactor with biomass recycling through carbon and nitrogen mass balances

被引：75
作者：
Alcantara, Cynthia [1 ]
Dominguez, Jesus M. [1 ]
Garcia, Dimas [1 ]
Blanco, Saul [2 ]
Perez, Rebeca [1 ]
Garcia-Encina, Pedro A. [1 ]
Munoz, Raul [1 ]
机构：
[1] Univ Valladolid, Dept Chem Engn & Environm Technol, E-47011 Valladolid, Spain
[2] Univ Leon, Dept Biodivers & Environm Management, E-24071 Leon, Spain
来源：
BIORESOURCE TECHNOLOGY | 2015年 / 191卷
关键词：
Algal-bacterial symbiosis; Dissimilatory nitrogen removal; Enhanced sedimentation; Inorganic carbon competition; Nitrous oxide emissions; TREATMENT-PLANT; OXIDE EMISSIONS; PHOTOINHIBITION; DENITRIFICATION; PERFORMANCE; OPERATION; COMMUNITY; DYNAMICS; PONDS; PH;
D O I：
10.1016/j.biortech.2015.04.125
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
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. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：173 / 186
页数：14
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