Efficiency of biofloc technology in suspended growth reactors treating aquacultural solid under intermittent aeration

Liang, Wenyan; Luo, Guozhi; Tan, Hongxin; Ma, Nana; Zhang, Nan; Li, Li

doi:10.1016/j.aquaeng.2014.02.001

Cited by 27 publications

(17 citation statements)

References 26 publications

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“…There were more reactive phosphorus in the effluents of the C: N ratio adjusted tanks. These results indicate that, except for the lower concentrations of TAN, the effluents of BFT tanks are able to cause a greater eutrophication impact than the effluents derived from conventional aquaculture tanks (Crab et al, 2012;Silva et al, 2013;Liang et al, 2014). Therefore, that is one more reason for not discharging the effluents of BFT tanks directly in the nature but reusing them in recirculation aquaculture systems.…”

Section: Effluent Qualitymentioning

confidence: 88%

<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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Section: Effluent Qualitymentioning

confidence: 88%

<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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“…The nitrite peak in the first experiment resulted in partial loss of animals from the 21% and 25% CP treatments. Ammonia and nitrite peaks are common in biofloc systems (Alves et al., ; Liang et al., ; Luo et al., ; Long, Yang, Li, Guan, & Wu, ). Nitrite peaks indicate a change in the microbial communities (Avnimelech, ), and thus, this toxic waste tends to accumulate until the community is established.…”

Section: Discussionmentioning

confidence: 99%

Crude protein levels in diets for two growth stages of Nile tilapia (Oreochromis niloticus) in a biofloc system

et al. 2018

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Biofloc technology (BFT) provides an additional feed source for aquatic organisms through the conversion of waste in microbial flocs. Because of this, the suitable protein level in a diet for animals in this system could be different from those in conventional systems. Our objective was to determine the suitable protein level in the diet of Nile tilapia juveniles reared with BFT. Two experiments were carried out with tilapia weighing~10 g (first experiment) and about 50 g (second experiment) during 61 and 98 days respectively. Five crude protein (CP) levels (within 17% and 33%) were tested. The increment of CP resulted in a reduction in dissolved oxygen, pH, alkalinity and an increase in dissolved phosphorus, total suspended solids and total ammonium nitrogen. The crude protein level had a significant effect (p < 0.05) on animal performance. The linear response plateau model was the best fit for the final weight and weight gain data in the two growth phases. In conclusion, tilapia juveniles of 10-60 g and 60-230 g in biofloc can be fed on diets with 28% of CP (26% of digestible protein) and 22% CP (20% of digestible protein) respectively. K E Y W O R D Sbiofloc technology, growth performance, Nile tilapia, nutrition

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“…; Liang et al . ). However, the C/N ratio in effluents is relatively low, and an extra carbon source is required to promote the growth of heterotrophic bacteria (Azim & Little ; Luo et al .…”

Section: Reutilization Of Solidsmentioning

confidence: 97%

Generation, characterization, perniciousness, removal and reutilization of solids in aquaculture water: a review from the whole process perspective

Bao

Zhu

Jin

et al. 2018

Reviews in Aquaculture

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The generation of solids by aquaculture activities has led to many problems in animal welfare, environmental quality, water treatment effects and public health, such as gill and intestinal damage, water eutrophication, system components blockages and antibiotics transfers through the food chain to human; thus, effective solid wastes management is very important. The purpose of this review is to summarize the sources, characterization methods, harmfulness, removal technologies and reutilization of solids in aquaculture water, including (i) different sources of solids, such as uneaten feed, feces and debris; (ii) solids characterization based on the general parameters, particle size distribution and chemical composition; (iii) the toxicity and detriment of solids to cultured species, the environment, aquaculture system components and human health; (iv) Solids removal, effluents solids thickening and source control techniques for better solids management; and (v) various methods for the reutilization of aquacultural solid wastes for resource value-adding. In addition to these five specific objectives, the merits and drawbacks of each method or technology and future research priorities are discussed. The present review provides an understanding of the role played by solids in aquaculture water and provides guidance for aquacultural solid wastes precision management, aquaculture practices and technological developments. Thus, solids management can be carried out based on this guidance to improve animal welfare and the stability of water treatment systems, reduce harm to the environment and public health, and enable the development of aquaculture in a sustainable way.

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Efficiency of biofloc technology in suspended growth reactors treating aquacultural solid under intermittent aeration

Cited by 27 publications

References 26 publications

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

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

Crude protein levels in diets for two growth stages of Nile tilapia (Oreochromis niloticus) in a biofloc system

Generation, characterization, perniciousness, removal and reutilization of solids in aquaculture water: a review from the whole process perspective

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