Effects of aerated and non-aerated biofilters on effluent water treatment from a small-scale recirculating aquaculture system for Nile tilapia ( L.)

Zipporah Gichana; David Liti; Silke-Silvia Drexler; Werner Zollitsch; Paul Meulenbroek; Joseph Wakibia; Erick Ogello; Peter Akoll; Herwig Waidbacher

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Effects of aerated and non-aerated biofilters on effluent water treatment from a small-scale recirculating aquaculture system for Nile tilapia (Oreochromis niloticus L.)

| 21 abr 2020

Die Bodenkultur: Journal of Land Management, Food and Environment

Volumen 70 (2019): Edición 4 (December 2019)

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Article Category: Research Article

Publicado en línea: 21 abr 2020

Páginas: 209 - 219

Recibido: 03 abr 2019

Aceptado: 17 sept 2019

DOI: https://doi.org/10.2478/boku-2019-0019

Palabras clave
Aerated, denitrification, nitrification, non-aerated, removal efficiency

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

An illustration of the recirculating aquaculture systems with the aerated and non-aerated biofilters. Arrows indicate the direction of water flow.Abbildung 1. Darstellung der geschlossenen Kreislaufanlage mit den aeroben und anaeroben Biofiltern. Die Pfeile stellen die Fließrichtung des Wassers dar.

Ammonia (NH3-N), nitrates (NO3-N), nitrites (NO2-N) and P (phosphorus) concentrations in the aerated and non-aerated biofilters. Error bars show standard deviations (n = 3).Abbildung 2. Konzentrationen von Ammoniak (NH3-N), Nitrat (NO3-N), Nitrit (NO2-N) und Phosphor (P) in den aeroben und anaeroben Biofiltern. Die Fehlerbalken stellen die Standardabweichungen dar (n = 3).

Boxplot showing nutrient removal efficiencies in aerated and non-aerated biofilters. Median values are shown in each box, vertical bars correspond to maximum and minimum values. Different letters (a, b) above boxplots indicate significant differences between the two types of biofilters (Student t-test) (p < 0.05).Abbildung 3. Boxplotdarstellung der Nährstoffreduktion in den aeroben und anaeroben Biofiltern. Unterschiedliche Buchstaben bei den jeweiligen Box-plots zeigen signifikante Unterschiede zwischen den beiden Filtertypen (Student t-test) (p < 0,05).

Water quality parameters in the fish tanks (Mean ± standard deviation)Tabelle 2. Wasserparameter in den Fischtanks (Mittelwerte ± Standardabweichung)

Parameters	Units	RAS_1	RAS_2
Temperature	[°C]	26.25 ± 2.72^a	26. 23 ± 2.67^a
pH		7.71 ± 0.19^a	7.72 ± 0.16^a
Dissolved oxygen	[mg L⁻¹]	2.37 ± 0.76^a	2.54 ± 0.79^a
Alkalinity	[mg L⁻¹]	226. 28 ± 36.70^a	223. 68 ± 38.48^a
Ammonia	[mg NH³-N L⁻¹]	2.43 ± 0.87^a	2.58 ± 0.76^a
Nitrate	[mg NO³-N L⁻¹]	2.92 ± 1.63^a	2.76 ± 1.54^a
Nitrite	[mg NO²-N L⁻¹]	0.26 ± 0.18^a	0.24 ± 0.08^a
Phosphorus	[mg L⁻¹]	1.48 ± 1.08^a	1.57 ± 1.06^a

Water quality parameters in the sump (fish tanks outlet/biofilter inlet) and aerated and non-aerated biofilter outlets. Mean values (± standard deviations) within a row with different superscripts are significantly different (a > b > c, p < 0.05).Tabelle 1. Wasserparameter im Sammelbehälter (Übergangsbereich vom Fischtanks zum Biofilter) sowie jeweils am Ende der aeroben und anaeroben Biofilterkette. Mittelwerte (± Standardabweichung) innerhalb einer Zeile mit unterschiedlichen Hochzahlen unterscheiden sich statistisch signifikant (a > b > c, p < 0,05).

Parameters	Units	Sump	Aerated biofilters	Non-aerated biofilters
Temperature	[°C]	25.18 ± 1.48^a	25.37 ± 1.70^a	25.50 ± 1.92^a
pH		7.81 ± 0.11^b	7.78 ± 0.09^b	7.70 ± 0.09^a
Dissolved oxygen	[mg L⁻¹]	2.89 ± 0.41^c	2.11 ± 0.77^b	1.45 ± 0.39^a
Alkalinity	[mg L⁻¹]	242.69 ± 32.83^a	216.79 ± 46.93^a	234.23 ± 56.13^a
Ammonia	[mg NH₃-N L⁻¹]	3.41 ± 0.39^b	1.96 ± 0.60^a	1.95 ± 0.65^a
Nitrates	[mg NO₃-N L⁻¹]	2.49 ± 0.60^b	3.16 ± 0.74^c	1.47 ± 0.89^a
Nitrites	[mg NO₂-N L⁻¹]	0.36 ± 0.16^a	0.55 ± 0.15^a	0.18 ± 0.07^a
Phosphorus	[mg L⁻¹]	2.14 ± 1.15^b	1.71 ± 1.25^ab	1.22 ± 0.78^a

Growth performance of O. niloticus in the recirculation aquaculture systems with aerated and non-aerated treatments. All values are means ± standard deviations obtained from three replicates.Tabelle 3. Wachstumsentwicklung von O. niloticus in der Kreislaufanlage mit aeroben und anaeroben Filtern. Alle Werte stellen Mittelwerte ± Standardabweichungen aus den drei Wiederholungen dar.

Parameters	Units	Treatments
Parameters	Units	Aerated biofilter	Non-aerated biofilter
Initial Mean Weight	[g]	54.5 ± 4.7^a	56.2 ± 2.7^a
Final Mean Weight	[g]	132.0 ± 18.0^a	129.8 ± 12.8^a
Weight gain	[g]	77.5 ± 17.2^a	73.6 ± 12.5^a
Specific growth rate	[% day⁻¹]	0.42 ± 0.07^a	0.38 ± 0.07^a
Final density	[kg m⁻³]	12.76 ± 2.45^a	12.84 ± 1.36^a
Feed conversion ratio		2.67 ± 0.62^a	3.04 ± 0.65^a
Survival rate	[%]	95.6 ± 4.44^a	93.3 ± 4.24^a

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Effects of aerated and non-aerated biofilters on effluent water treatment from a small-scale recirculating aquaculture system for Nile tilapia (Oreochromis niloticus L.)

Article Category: Research Article

Publicado en línea: 21 abr 2020

Páginas: 209 - 219

Recibido: 03 abr 2019

Aceptado: 17 sept 2019

DOI: https://doi.org/10.2478/boku-2019-0019

Palabras clave
Aerated, denitrification, nitrification, non-aerated, removal efficiency

© 2019 Zipporah Gichana et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Figure 2

Figure 3

Water quality parameters in the fish tanks (Mean ± standard deviation)Tabelle 2. Wasserparameter in den Fischtanks (Mittelwerte ± Standardabweichung)

Effects of aerated and non-aerated biofilters on effluent water treatment from a small-scale recirculating aquaculture system for Nile tilapia (Oreochromis niloticus L.)

Article Category: Research Article

Publicado en línea: 21 abr 2020

Páginas: 209 - 219

Recibido: 03 abr 2019

Aceptado: 17 sept 2019

DOI: https://doi.org/10.2478/boku-2019-0019

Palabras claveAerated, denitrification, nitrification, non-aerated, removal efficiency

© 2019 Zipporah Gichana et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Figure 2

Figure 3

Water quality parameters in the fish tanks (Mean ± standard deviation)Tabelle 2. Wasserparameter in den Fischtanks (Mittelwerte ± Standardabweichung)

Palabras clave
Aerated, denitrification, nitrification, non-aerated, removal efficiency