Technical communication

Seven factors influence the reproduction of nitrifying bacteria

Biofiltration is the soul of the circulating water aquaculture. Because the world has not yet more economical and practical method of removing ammonia nitrogen and nitrite. Nitrifying bacteria are main cultivation object of biological filtration. They include the nitrite bacteria and nitrobacteria. They can put the ammonia and nitrite in the water respectively into nitrite and nitrate. Where possible. Can also through the denitrifying bacteria in the water nitrate is converted into nitrogen discharge water. So as to achieve the aim of reducing total nitrogen in water. The cultivation of the nitrifying bacteria need the support of various environmental factors. The following is a brief description.

The temperature
Nitrifying bacteria is a kind of temperament is unique bacteria. Their active temperature at 25 to 30 degrees Celsius. Below 5 degrees Celsius is dormant. So now the most widely popular nitrifying bacteria is suitable for high temperature circulating water breeding in south. If in the low temperature environment to achieve the same effect, will be expected to cold acclimation of nitrifying bacteria.
PH

Experimental data show that when the PH of the water below 7 (partial acid), the number of nitrifying bacteria decreased obviously. Therefore in the process of cultivation, moment to detect and adjust water PH value greater than or equal to 7, is the key to the success of training.

Concentration of ammonia nitrogen

The function of the nitrite bacteria is the ammonia nitrogen is converted to nitrite in the water. When the early factory aquaculture, the ammonia nitrogen in the water level is low, the number of nitrous acid bacteria was also a very low level. With the passage of time, the ammonia nitrogen levels rising, the number of nitrite bacteria. Both have certain concomitant synchronization phenomenon. As the ammonia nitrogen levels drop steadily, nitrous acid bacteria population tends to be stable.

Dissolved oxygen degree
Nitrifying bacteria are aerobic bacteria. Data show that when the high BOD in aquaculture water, biofiltration apparent decline in the number of bacteria. And under the condition of oxygen sufficient exposure, the number of nitrifying bacteria can be at his best when he meet other environmental conditions.
light
Nitrifying bacteria are xi Yin bacteria. Them to light the tolerance is very poor. So it should not be placed in a transparent environment, especially with ultraviolet light. When circulating water aquaculture system equipped with UV sterilizer, should pay special attention to the two incompatible characteristics.
Other strains of competition
When the high content of organic matter in water, organic compounds as carbon source of decomposing bacteria stimulation. Characterized by the rise in the Numbers. At this time, the number of nitrifying bacteria will be adversely affected. There is competition between different species. So in front of the biofilter increases physical filtration is necessary.
The form of biological filtration

During the growth of nitrifying bacteria, a "transplanting" procedure is required. In particular, the porous surface of biological fillers, so the selection of good biological fillers, in the process of cultivating nitrifying bacteria, will play a double role.