Performance of a closed recirculating system with foam separation, nitrification and denitrification units for intensive culture of eel: towards zero emission

Suzuki, Yoshihiro; Maruyama, Toshiroh; Numata, Hiroyuki; Satō, Hajime; Asakawa, Makio

doi:10.1016/j.aquaeng.2003.08.001

Cited by 66 publications

(28 citation statements)

References 23 publications

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“…The amounts of biological solids were the sum of suspended solids in water and those removed from cultured tank using filtration unit and in rinsing water. The percentages of nitrogen retention in fish (i.e., 39.3%) reported in this study were comparable to those of other works, which showed the nitrogen retention ranged from 25 to 40% [7,10,21,22]. Solid removal by filtration unit was apparently not the primary means for inorganic nitrogen control in the compact aquaculture system because it accounted for only 9.61% of the total nitrogen input.…”

Section: Parameters Averagesupporting

confidence: 77%

Development and Evaluation of Compact Aquaculture System for the Application of Zero Water-Exchange Inland Aquacultures

Khammi

Kutako

Sangwichien

et al. 2015

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Abstract. This study evaluated the performance of land-based compact aquaculture system integrating fibrous nitrifying biofilters and solid removal unit. The first experiment indicated that the compact aquaculture system with total biofilter length of 6.0 m and single solid separating was able to accommodate aquaculture weight as high as 5.0 kg/m 3 , which corresponded to nitrogen loading rates of 8.4 mg N/L/day. In the second experiment, more effective solid-liquid separation and good water quality were achieved when solid separating unit was replaced by filtration unit with Japanese mats as filtered media, and cleaning of biofilters and filtration unit was conducted in every 4 days. Next, the compact aquaculture system was employed to cultivate tilapia without water-exchange for 60 days using the described strategies. TAN and nitrite were well below acceptable limit of 1.0 mg N/L; suspended solids varied between 20 and 35 mg SS/L; and harvesting fish weights were 10.4 kg/m 3 . Fish survival rate at 97% and average growth rate of 3.45 g/day were reported. Finally, solid removal remained the critical factor for successful aquacultures in the compact system even under extensive or semi-intensive aquaculture cultivation, and nitrogen mass balance indicated that nitrification-denitrification were main treatment pathways while solid removal only prolonged the activity of nitrifying biofilters.

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Section: Parameters Averagesupporting

confidence: 77%

Development and Evaluation of Compact Aquaculture System for the Application of Zero Water-Exchange Inland Aquacultures

Khammi

Kutako

Sangwichien

et al. 2015

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“…Heterotrophic denitrification is often cited as a biological process to complete inorganic nitrogen treatment because it reduces nitrate into nitrogen gas with organic carbon served to provide electrons for heterotrophic bacteria under anaerobic condition [10]. Employment of heterotrophic denitrification for nitrate removal in domestic and industrial wastewater is common, yet reports on the application for aquaculture effluent have been limited [2,10]. Another operational difficulty associated with employing biofilters, especially during intensive cultivation with the animal weight density greater than 5.0 kg/m 3 , is solids accumulation on biofilters surface, leading to the decrease in nitrifying activities and subsequently failure to control water quality [10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Recirculating aquaculture systems are the effective means for environmentally friendly and high productivity of fish and shrimp production [1][2]. Two related problems occur frequently during an operation of recirculating aquaculture systems, namely excessive production of solids and accumulation of inorganic nitrogen compounds [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Control of Inorganic Nitrogen and Suspended Solids Concentrations in a Land-Based Recirculating Aquaculture System

Nootong¹,

Nurit²,

Powtongsook³

2013

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Abstract. This study intended to evaluate the performance of land-based aquaculture system integrating solids separating units, nitrifying biofilters, and tubular denitrifying reactor during the closed-water tilapia cultivation for 98 days. Operation of both solids separating units was able to maintain suspended solids (SS) concentrations in the rearing tank below 35 mg SS/L. Simultaneous operation of nitrifying biofilters, ORP-controlled denitrifying reactor, and two solids separating units was capable of maintaining total ammonia nitrogen (TAN) and nitrite concentrations substantially below 1.0 mg N/L and nitrate concentrations less than 12.0 mg N/L despite nitrogen loading rate and tilapia weight density were as high as 21.6 mg N/L/day and 17.2 kg/m 3 , respectively. Without solids separating units, TAN and nitrite concentrations drastically increased above the acceptable limits of 1.0 mg N/L. Finally, the result of nitrogen balance analysis indicated that nitrification and denitrification were the primary treatment pathways in this recirculating system capable of removing 49.8% of total nitrogen input, whereas solids separating units removed 9.5% of total nitrogen input yet their presence was essential for sustaining the activity of nitrifying biofilters for an extended period.

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“…Several studies have documented a high loss of nutrients from the recycling loop via the mechanical water treatment unit as well as unused Recirculating Aquaculture System (RAS)-derived sludge [1][2][3][4][5][6] that consists of feces and uneaten feed. Consequently, the reuse of sludge is gaining importance and plays a crucial role in the utilization of the supplied nutrients and thereby in reduction of nutrient emissions [2,7].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce

et al. 2016

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Abstract:The mobilization of nutrients from fish sludge (i.e., feces and uneaten feed) plays a key role in optimizing the resource utilization and thus in improving the sustainability of aquaponic systems. While several studies have documented the aerobic and anaerobic digestion performance of aquaculture sludge, the impact of the digestate on plant growth has yet to be understood. The present study examines the impact of either an aerobic or an anaerobic digestion effluent on lettuce plant growth, by enriching a mixture of aquaculture and tap water with supernatants from both aerobic and anaerobic batch reactors. The lettuce plants grown in the hydroponic system supplied with supernatant from an anaerobic reactor had significantly better performance with respect to weight gain than both, those in the system where supernatant from the aerobic reactor was added, as well as the control system. It can be hypothesized that this effect was caused by the presence of NH 4 + as well as dissolved organic matter, plant growth promoting rhizobacteria and fungi, and humic acid, which are predominantly present in anaerobic effluents. This study should therefore be of value to researchers and practitioners wishing to further develop sludge remineralization in aquaponic systems.

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Performance of a closed recirculating system with foam separation, nitrification and denitrification units for intensive culture of eel: towards zero emission

Cited by 66 publications

References 23 publications

Development and Evaluation of Compact Aquaculture System for the Application of Zero Water-Exchange Inland Aquacultures

Development and Evaluation of Compact Aquaculture System for the Application of Zero Water-Exchange Inland Aquacultures

Control of Inorganic Nitrogen and Suspended Solids Concentrations in a Land-Based Recirculating Aquaculture System

The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce

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