The role of Pure Nano Oxygen Bubbles in the nitrogen cycle of tilapia biofloc systems
https://www.sciencedirect.com/science/article/abs/pii/S0045653525004667
in biofloc systems by 87.79 %.
Nanobubbles with Pure Oxygen Gas improve nitrification and denitrification
in second-order kinetic reactions.
Nanobubbles with Pure Oxygen Gas prevent excessive nitrite accumulation
, maintaining a better nitrogen balance.
Enhanced aeration in BFT with Nanobubbles with Pure Oxygen Gas optimizes
oxygen levels by 9.22 % and boosts fish growth performance by 18.8 %.
Nanobubbles with Pure Oxygen Gas provide 32.7 % carbon efficiency as a
sustainable solution for biofloc-based aquaculture.
The nitrogen cycle is crucial in aquaculture, particularly biofloc technology (BFT),
where microbial communities regulate nitrogen dynamics to maintain water quality.
This study evaluates the impact of Pure Nano Oxygen Bubbles (BFT-PNOBs) on
nitrogen cycling and its subsequent effects on the water quality, feed efficiency, and
growth performance of Nile tilapia (Oreochromis niloticus) compared to conventional
BFT. Over 56 days, the total nitrogen concentration in both systems was
118.54–119.49 mg/L. NH4+ concentrations were consistently lower in BFT-PNOBs
at 0.63 mg/L than in BFT at 0.70 mg/L, suggesting a more efficient nitrification
process facilitated by higher dissolved oxygen (DO) levels of 7.72 mg/L in BFT-PNOBs
compared to BFT (6.67 mg/L). The selectivity of nitrogen transformation into bioavailable
forms was also more efficient in BFT-PNOBs, with 58.47 % of nitrogen converted into
microbial biomass and gaseous nitrogen, compared to 38.78 % in BFT. Additionally,
with carbon maintained at ∼250 mg/L in both systems, the higher and more stable C/N
ratio observed in BFT-PNOBs and BFT (13.99 and 10.14, respectively) reflects more
efficient nitrogen removal and microbial assimilation. The superior nitrogen management
in BFT-PNOBs minimized toxic nitrogen accumulation, stabilized water quality, and
enhanced fish performance, resulting in a higher final body weight of 57.13 g compared
to 48.08 g in BFT and a greater survival rate. These findings suggest that nano-oxygen
bubble-enhanced biofloc systems optimize nitrogen cycling, supporting sustainable
aquaculture by reducing environmental nitrogen waste, enhancing fish growth, and
improving feed utilization.
