Nitrogen budget and effluent nitrogen components in aquaponics recirculation system
In this study, the dynamics of nitrogen through aquaponics recirculation system was examined by developing a nitrogen budget. The model evaluated total ammonia nitrogen (TAN) production and removal in biofilters, identifying and quantifying the fate of nitrate nitrogen (NO 3 -N) and determining...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.unisza.edu.my/4839/1/FH02-FPBSM-14-00328.pdf http://eprints.unisza.edu.my/4839/2/FH02-FSTK-14-00811.jpg http://eprints.unisza.edu.my/4839/ |
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| Summary: | In this study, the dynamics of nitrogen through aquaponics recirculation system was
examined by developing a nitrogen budget. The model evaluated total ammonia nitrogen
(TAN) production and removal in biofilters, identifying and quantifying the fate of nitrate
nitrogen (NO
3 -N) and determining the system maximum carrying capacity. Of the nitrogen
input into the culture tank via feed, 83.8% was recovered from different pool: 39.4% as fish
flesh (harvested), 2.1% as mortalities, 34.7% as dissolved inorganic forms of nitrogen and
7.6% as total organic nitrogen. The remaining 16.2% of nitrogen unaccounted for likely was
lost as nitrogen gas due to passive denitrification and as volatization of ammonia. Average
TAN in the culture tanks was 2.08 mg/L. Under current condition, system loading with fish
biomass at average of 68.5% of the maximum predicted. The hydroponic troughs removal
efficiency averaged 60.4% TAN per pass. From TAN production, 88% was removed in
hydroponic troughs, 11% by passive nitrification and 1% by water exchange. Under conditions of reusing treated effluent with residual TAN, the hydroponic troughs work normally,
while TAN in the systems did not increase noticeably. |
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