Production of algal biomass, chlorophyll, starch and lipids using aquaculture wastewater under axenic and non-axenic conditions

Halfhide, Trina; Åkerström, Å.; Lekang, Odd Ivar; Gislerød, Hans R.; Ergas, Sarina J.

doi:10.1016/j.algal.2014.10.009

Cited by 68 publications

(37 citation statements)

References 58 publications

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“…In both Chlorella and Scenedesmus, the N and P concentration in the biomass responded to the supply of these nutrients, being high when the supply in the medium is high and low when the supply in the medium is low. This is in agreement with previous research (Akerstr€ om et al, 2014; Arbib et al, 2013;Dickinson et al, 2013;Halfhide et al, 2014). Interestingly, in both species, the uptake of P not only depended on the supply of P but also on the supply of N. At high N supply, the concentration of P in the biomass was a function of the supply of P. At low N supply, the concentration of P in the biomass was low, irrespective of the supply of P in the medium.…”

Section: Discussionsupporting

confidence: 91%

Nitrogen availability influences phosphorus removal in microalgae-based wastewater treatment

2015

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Microalgae offer a promising technology to remove and re-use the nutrients N and P from wastewater. For effective removal of both N and P, it is important that microalgae can adjust the N and P concentration in their biomass to the N and P supply in the wastewater. The aim of this study was to evaluate to what extent microalgae can adjust the N and P concentrations in their biomass to the N and P supply in the wastewater, and to what extent supply of one nutrient influences the removal of the other nutrient. Using Chlorella and Scenedesmus as model organisms, we quantified growth and biomass composition in medium with different initial N and P concentrations in all possible combinations. Nutrient supply marginally affected biomass yield of both microalgae but had a strong influence on the composition of the biomass. The nutrient concentrations in the biomass ranged 5.0-10.1 % for N and 0.5-1.3 % for P in Chlorella and 2.9-8.4 % for N and 0.5-1.7 % for P in Scenedesmus. The concentrations of P in the biomass remained low and were relatively constant (0.6-0.8 % P) when the N concentration in the biomass was low. As a result, removal of P from the wastewater was influenced by the concentration of N in the wastewater. When the initial N concentration in the wastewater was above 40 mg L(-1) the microalgae could remove up to 6 mg P L(-1), but this removal was only 2 mg P L(-1) when the initial N concentration was below 20 mg L(-1). A lower N supply increased the carbohydrate concentration to about 40% and lipid concentration to about 30% for both species, compared to around 15% and 10% respectively at high N supply. Our results show that sufficiently high N concentrations are needed to ensure effective P removal from wastewater due to the positive effect of N on the accumulation of P.

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Section: Discussionsupporting

confidence: 91%

Nitrogen availability influences phosphorus removal in microalgae-based wastewater treatment

2015

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“…In the postculture wastewater, the concentration increased to 4.69 g/L, while in the F/2 medium, it increased to 3.61 g/L. In the studies carried out by Halfhide et al [35] a maximum mean biomass concentration for Scenedesmus (0.41 g/L) in the tilapia RAS wastewater was achieved after 36 h. The high contents of nitrogen and phosphorus in wastewater are reported to promote the production of microalgal biomass, with the proportion of these components playing an important In this study, the pH of the growth environment of C. minutissima was slightly alkaline and ranged from 7.98 to 8.54 ( Table 2). The pH changes may have been a result of CO 2 consumption from the medium or the absorption of nitrate ions by the microalgae [33].…”

Section: Microalgal Growth In Aquculture Wastewatermentioning

confidence: 91%

“…In the postculture wastewater, the concentration increased to 4.69 g/L, while in the F/2 medium, it increased to 3.61 g/L. In the studies carried out by Halfhide et al [35] a maximum mean biomass concentration for Scenedesmus (0.41 g/L) in the tilapia RAS wastewater was achieved after 36 h. The high contents of nitrogen and phosphorus in wastewater are reported to promote the production of microalgal biomass, with the proportion of these components playing an important role [30]. In the studies conducted by Tossavainen et al [36], the largest content of mixed biomass of Euglena gracilis and Selenastrum (1.5 g/L) was observed in the wastewater obtained from pikeperch aquaculture, in which the contents of nitrogen and phosphorus were 34.4 and 6.1 mg/L, respectively.…”

Section: Microalgal Growth In Aquculture Wastewatermentioning

confidence: 91%

Production of Microalgal Biomass Using Aquaculture Wastewater as Growth Medium

Hawrot-Paw

Koniuszy

Gałczyńska

et al. 2019

Water

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Aquaculture wastewater contains a huge amount of substances that can cause environmental pollution. However, microalgae can absorb these compounds and convert them into useful biomass. In this study, Chlorella minutissima was grown in the wastewater resulting from saline aquaculture. The microalgae were found to effectively utilize nitrogen and phosphorus in the wastewater for its growth. During wastewater treatment, the cell density increased almost fivefold compared to the initial value (OD 680 0.502). Moreover, batch culture resulted in the maximum biomass concentration and productivity of 4.77 g/L and 0.55 g/L/day, respectively. The contents of total nitrogen and total phosphorus in wastewater decreased by 88% and over 99%, respectively. In addition, the content of N-NO 3 was reduced by 88.6%, N-NO 2 by 74.3%, and dissolved orthophosphates (V) by 99%. At the beginning and throughout the experiment, the content of N-NH 4 in wastewater remained below 0.05 mg/L. Furthermore, a high lipid content of 46.4% (w/w) was also obtained from the studied microalgae.

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“…The growth of one of those groups probably leads to the impairment of the others. Besides, the high water turbidity in the bioflocs and biophyton tanks limits the phytoplankton and periphyton productivity due to the scarcity of underwater light (Schrader, Green, & Perschbacher, 2011;Green et al, 2014;Halfhide, Akerstrom, Lekang, Gislerod, & Ergas, 2014).…”

Section: Results and Discussion Water Qualitymentioning

confidence: 99%

<b>Association between periphyton and bioflocs systems in intensive culture of juvenile Nile tilapia

Cavalcante

Lima

Rebouças

et al. 2016

Acta Sci. Anim. Sci.

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ABSTRACT. The present work aimed at determining the effects of the association between the periphyton-based system with the bioflocs-based system in the intensive culture of juvenile Nile tilapia (1.56 ± 0.07 g; 72 fish m -3 ), on variables of water quality, growth performance and effluent quality after 10 weeks. The experiment was arranged in a 2 x 2 factorial randomized block design with four treatments and five repetitions each. The factors tested were the following: 'underwater structure' (absence and presence) and 'adjustment of the C: N ratio of water' (no and yes). The final fish body weight, specific growth rate and yield were higher (p < 0.05) in the C: N-adjusted tanks. The presence of submerged structures in the tanks had no significant influence on those same variables. It was concluded that the periphyton-based system is not indicated for intensive farming of Nile tilapia, in which there is a high allowance of artificial feed to fish.Keywords: aquaculture, Oreochromis, limnoculture, limnology.Integração dos sistemas perifíton e bioflocos no cultivo intensivo de juvenis de tilápia do Nilo RESUMO. O presente trabalho teve por objetivo determinar os efeitos da integração do sistema baseado em substrato (perifíton) com o sistema baseado no ajuste da relação C: N da água (bioflocos), no cultivo intensivo de juvenis de tilápia do Nilo (1,56 ± 0,07 g; 72 peixes m -3 ), sobre variáveis de qualidade de água, desempenho zootécnico e qualidade de efluentes, após 10 semanas. O delineamento experimental utilizado foi em blocos ao acaso, em arranjo fatorial 2 x 2, com quatro tratamentos e cinco repetições cada. Os fatores em teste foram os seguintes 'estruturas submersas' (ausência e presença) e 'ajuste da relação C: N da água' (não e sim). Os resultados de peso corporal final, taxa de crescimento específico e produtividade de peixe foram maiores (p < 0,05) nos tanques nos quais se fez o ajuste da relação C: N da água, quando comparado aos tanques sem esse ajuste. A presença das estruturas submersas nos tanques não afetou de modo significativo essas mesmas variáveis. Concluiu-se que o sistema de cultivo de peixe baseado em substrato (perifíton) não é indicado para cultivos intensivos de juvenis de tilápia do Nilo, nos quais há grande entrada de alimento artificial nos tanques de cultivo.

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Production of algal biomass, chlorophyll, starch and lipids using aquaculture wastewater under axenic and non-axenic conditions

Cited by 68 publications

References 58 publications

Nitrogen availability influences phosphorus removal in microalgae-based wastewater treatment

Nitrogen availability influences phosphorus removal in microalgae-based wastewater treatment

Production of Microalgal Biomass Using Aquaculture Wastewater as Growth Medium

<b>Association between periphyton and bioflocs systems in intensive culture of juvenile Nile tilapia

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