Nitrogen budget and effluent nitrogen components in aquaponics recirculation system

Endut, Azizah (2014) Nitrogen budget and effluent nitrogen components in aquaponics recirculation system. Desalination and Water Treatment, 52 (4-6). pp. 744-752. ISSN 1944-3994

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Abstract

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.

Item Type: Article
Keywords: Aquaponics recirculation system; Mass balance; Nitrogen budget; Passive denitrification; Passive nitrification
Subjects: T Technology > TD Environmental technology. Sanitary engineering
Faculty / Institute: Faculty of Design Arts & Engineering Technology
Depositing User: AP DR AZIZAH ENDUT
Date Deposited: 18 May 2014 13:08
Last Modified: 18 May 2014 13:08
URI: http://erep.unisza.edu.my/id/eprint/1014

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