Comparisons of nitrogen and phosphorus mass balance for tomato-, basil-, and lettuce-based aquaponic and hydroponic systems

This study aimed to evaluate the production performance and nitrogen and phosphorus mass balance of biofloc-based intensive African catfish Clarias gariepinus culture at different densities. African catfish with an average body weight of 2.64 ± 0.06 g was randomly distributed into 12 units of round tank with a working volume of 2 m3 of water and maintained for 8 weeks. A completely randomized experimental design with four treatments (in triplicates), i.e. a control treatment at a fish density of 500 fish m-3 with regular water exchange and without organic carbon source addition, and biofloc treatments (BFT) at three different densities, i.e. 500 fish m-3 (BFT500), 750 fish m-3 (BFT750), and 1000 fish m-3 (BFT1000). Biofloc systems were performed with a regular addition of tapioca flour (40% C). The production performance between biofloc system and the control was not significantly different, however water and nitrogen utilizations were significantly more efficient in biofloc system than those of the control. The highest fish specific growth rate was observed in BFT1000 and BFT500 (6.01% day-1 and 5.96% day-1, respectively) (P<0.05). Fish density significantly affected the fish growth performance and productivity in biofloc systems, but not nitrogen and phosphorus utilizations. In conclusion, higher fish density significantly increased the production and water utilization efficiency in biofloc systems, but has no effect on nitrogen and phosphorus utilization efficiency. Furthermore, increasing the fish density could significantly reduce the fish survival and require more efforts to control biofloc biomass in the culture system.

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Whole-Herd Optimization with the Cornell Net Carbohydrate and Protein System. III. Application of an Optimization Model to Evaluate Alternatives to Reduce Nitrogen and Phosphorus Mass Balance

Journal of Dairy Science ◽

10.3168/jds.s0022-0302(00)75099-5 ◽

2000 ◽

Vol 83 (9) ◽

pp. 2160-2169 ◽

Cited By ~ 19

Author(s):

S.J. Wang ◽

D.G. Fox ◽

D.J.R. Cherney ◽

L.E. Chase ◽

L.O. Tedeschi

Keyword(s):

Mass Balance ◽

Optimization Model ◽

Nitrogen And Phosphorus ◽

Protein System ◽

Phosphorus Mass Balance

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Economic effect of reducing nitrogen and phosphorus mass balance on Wisconsin and Québec dairy farms

Journal of Dairy Science ◽

10.3168/jds.2016-11984 ◽

2017 ◽

Vol 100 (10) ◽

pp. 8614-8629 ◽

Cited By ~ 4

Author(s):

D. Pellerin ◽

E. Charbonneau ◽

L. Fadul-Pacheco ◽

O. Soucy ◽

M.A. Wattiaux

Keyword(s):

Mass Balance ◽

Economic Effect ◽

Dairy Farms ◽

Nitrogen And Phosphorus ◽

Phosphorus Mass Balance

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EFFECT OF FOUR DIFFERENT PRETREATMENTS IN NITROGEN AND PHOSPHORUS FLOW AND MASS BALANCE IN EFFLUENTS OF A RECIRCULATING AQUACULTURE SYSTEM

CICIMAR Oceánides ◽

10.37543/oceanides.v31i2.183 ◽

2016 ◽

Vol 31 (2) ◽

pp. 21

Author(s):

Juan P. González -Hermoso ◽

Emilio Peña -Messina ◽

Anselmo Miranda -Baeza ◽

Luis R. Martínez -Córdoba ◽

María T. Gutiérrez -Wing ◽

...

Keyword(s):

Anaerobic Digestion ◽

Mass Balance ◽

Biological Degradation ◽

Nitrogen And Phosphorus ◽

Recirculating Aquaculture ◽

P Content ◽

Recirculating Aquaculture Systems ◽

High Concentrations ◽

Intensive Aquaculture ◽

Phosphorus Flow

ABSTRACT. The effluents from intensive aquaculture operations such as recirculating aquaculture systems (RAS) have high concentrations of sludge that can become a source of pollution if they are not properly treated and disposed. Anaerobic digestion is commonly used for biological degradation of sludge. Pretreatments prior to anaerobic digestion can enhance sludge degradation and decrease nitrogen and phosphorus load through microbial activity. This study examines the effect of four different pretreatments (biological, chemical, mechanical and thermal) in the N and P fluxes and mass balance from a RAS effluent in a seven-month period at ambient temperature. Each month a 15-day experiment was performed. All pretreatments, except chemical, removed N (thermal 29.78%, biological 36.75%, control 42.25%, mechanical 49.46%, chemical -7.68%). All pretreatments produced phosphorus (chemical 1.96%, mechanical 16.07%, thermal 24.37%, biological 32.39%, control 58.50%). Our results showed that the mechanical pretreatment was the most effective in removing N. In contrast, none of the pretreatments reduced P content in the sludge.Efecto de cuatro pretratamientos en el flujo y balance del nitrógeno y el fósforo en efluentes de un sistema de recirculación acuícolaRESUMEN. Los efluentes de un tipo de cultivo intensivo como los Sistemas de Recirculación Acuícola (SRA) presentan altas concentraciones de lodos que pueden llegar a ser una fuente de contaminación si no son tratados y dispuestos apropiadamente. La digestión anaeróbica es usualmente empleada para llevar a cabo la degradación de los lodos. Los pretratamientos previos a la digestión anaeróbica pueden mejorar la degradación de los lodos, así como reducir la carga de nitrógeno y fósforo a través de la actividad microbiana. Este estudio examinó el efecto de cuatro pretratamientos (biológico, químico, mecánico y térmico) en el flujo y balance de masas de N y P de efluentes de un SRA durante un periodo de 7 meses a temperatura ambiente. En cada mes se llevó a cabo un experimento de 15 días. Todos los pretratamientos a excepción del químico, eliminaron nitrógeno (térmico 29.78%, biológico 36.75%, control 42.25%, mecánico 49.46%, químico -7.68%). Todos los pretratamientos produjeron fósforo (químico 1.96%, mecánico 16.07%, térmico 24.37%, biológico 32.39%, control 58.60%). Nuestros resultados indican que el pretratamiento mecánico fue el más efectivo para eliminar N. En contraste, ninguno de los pretratamientos redujo la concentración de fósforo.

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