Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 23, Issue 7, Pages 6671-6679Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-015-5898-0
Keywords
Aquaponics; Nitrogen utilization efficiency; System optimization; N2O emission
Categories
Funding
- National Natural Science Foundation of China [21307076, 41305124]
- Fundamental Research Funds of Shandong llniversity [2014TB003, 2015JC056]
- National Water Special Project [2012ZX07203-004]
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Aquaponics has attracted worldwide attention in recent years and is considered as an alternative technology for conventional aquaculture. In this study, common carp (Cyprinus carpio) and pakchoi (Brassica chinensis) were cultured in lab-scale aquaponics, and attempts were conducted to enhance its nitrogen utilization efficiency (NUE) through two optimization methods, i.e., nitrifies addition (NA) and filler gradation (FG). Results showed that NA and FG could improve the NUE of aquaponics by 8.8 and 16.0 %, respectively, compared with control. The total ammonia (TAN) and nitrite (NO2 (-)) concentrations in NA and FG systems were maintained at relatively low level (TAN < 0.5 mg/L, NO2 (-) < 0.1 mg/L), which demonstrated that both the NA and FG could provide non-toxic water environment for fish culture. Nitrous oxide conversion ratio of the control, NA, and FG were 0.8, 1.2, and 1.7 %, respectively, indicating that media-based aquaponics also contributed to global warming. Although the two proposed attempts in this study caused more N2O emission, they made new breakthrough in improving the NUE of aquaponics.
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