Nitrifying Bioreactors for Recirculating Aquaculture Systems

Nitrification Principle / Field Trials of Nitrification Efficiency

All the 6 reactors that constitute the PBBR exhibited ammonia consumption of ˜ 1ppm/hr (Fig 1 (a), (b) & (c)), and the rate of consumption increased with the strength of the substrate.

All the 6 reactors that constitute the PBBR exhibited ammonia consumption of ˜ 1ppm/hr (Fig 2 (a), (b) & (c)), and the rate of consumption increased with the strength of the substrate .

The increase in the substrate concentration resulted in the increased substrate consumption.


Fig 1(a)


Fig 1(b)


Fig 1(c)

Fig. 1(a), Fig 1(b), and Fig 1(c) : Ammonia removal by the reactors under varying substrate concentrations (a = 2 ppm, b = 5 ppm, c = 10 ppm). R1 to R6 refer to the six reactors that constitute the PBBR.


Fig 2(a)


Fig 2(b)


Fig 2(c)

Fig. 2(a), Fig.2(b), Fig.2(c) : Nitrite removal by the reactors under varying substrate concentrations (a =2 ppm, b = 5 ppm, c = 10 ppm). R1 to R6 refer to the six reactors that constitute the PBBR.


Fig. 3. Volumetric TAN removal rates by the reactor with flow rate.

The maximum volumetric TAN removal was obtained at its maximum turn over of 2500L/hr was 18 g NH4+-N per day with a HRT of 48 seconds.

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