Journal
BIORESOURCE TECHNOLOGY
Volume 245, Issue -, Pages 358-364Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.08.116
Keywords
Aquaponics; Algal-bacterial consortia; Nitrogen utilization efficiency; N2O emission; Photobioreactor
Funding
- China Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07101003]
- National Natural Science Foundation of China [51578321, 41401562]
- Fundamental Research Funds of Shandong University [2017JC025]
- Young Talents Program of University of Hebei [BJ2014041]
- National Science Foundation for Post- doctoral Scientists of China [2014M561197]
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Aquaponics is a promising technology combining aquaculture with hydroponics. In this study, algal-bacterial consortia were introduced into aquaponics, i.e., algal-bacterial based aquaponics (AA), to improve the nitrogen utilization efficiency (NUE) of aquaponics. The results showed that the NUE of AA was 13.79% higher than that of media-based aquaponics (MA). In addition, higher NO3- removal by microalgae assimilation led to better water quality in AA, which made up for the deficiencies of poor aquaponic management of nitrate. As a result of lower NO3- concentrations and dramatically higher dissolved oxygen (DO) concentrations caused by microalgae photosynthesis in the photobioreactor, the N2O emission of AA was 89.89% lower than that of MA, although nosZ gene abundance in MA's hydroponic bed was approximately 30 times over that in AA. Considering the factors mentioned above, AA would improve the sustainability of aquaponics and have a good application foreground.
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