The layout and installation of fans and oxygen trays for micro porous aeration at the bottom of fish pond aquaculture are of great significance for improving water dissolved oxygen and promoting the growth of aquaculture objects. The following is a detailed explanation of its layout and installation:
1、 Oxygen disk layout and installation
There are two main methods for the layout and installation of oxygen discs, also known as aeration discs:
1. Disc installation method
Bend steel bars with a diameter of 4-6 millimeters into a frame, and fix the aeration tube on the frame.
The recommended total length of the tray frame is 15-20 meters (there are also claims that the total length can reach 1520 meters, but it should be adjusted according to the actual breeding area).
Install 34 aeration plates per acre, and the plate frame should be fixed at the bottom of the pool, 1015 centimeters away from the bottom of the pool.
2. Strip installation method
The total length of the aeration pipe is about 60 meters, with a pipe spacing of about 10 meters.
The height difference shall not exceed 10 centimeters and shall be fixed at the bottom of the pool, also 10-15 centimeters away from the bottom of the pool.
2、 Fan selection and installation
1. Fan selection
The fan should be matched with the pool area and water depth. The commonly used specifications for oxygenation fans include 2.2 kW, 3 kW, 4 kW, 5.5 kW, 7.5 kW, and other models.
When the water depth is shallow, the impeller type aerator is not suitable to prevent the sludge at the bottom of the aquaculture pond from rising, leading to an increase in biochemical oxygen consumption and a decrease in the dissolved oxygen content of the pond.
2. Fan installation
The aerator fan should be placed in a stable location, avoiding vibration, and the surrounding environment should be well ventilated, clean, and dry.
The filters and noise reduction devices at both ends of the fan inlet and outlet should be cleaned regularly to avoid dust and garbage causing blockage of the fan and piping, which can affect normal operation.
3、 Usage and maintenance
1. Usage method
Determine the time and period for starting up and increasing oxygen based on the changes in dissolved oxygen in the water. For example, from April to May, on cloudy and rainy days, the machine will be turned on at night; Power on for 2-3 hours from June to October afternoon, and 2-3 hours before and after sunrise; Continuous rainy or low-pressure weather, starting from 21:00 to 22:00 at night and continuing until noon on the second day.
If conditions permit, perform dissolved oxygen testing and turn on the device at the appropriate time to ensure that the dissolved oxygen in the water is between 6-8 milligrams per liter.
2. Maintenance requirements
When the aerator fan is working, the working pressure should not exceed 8KPa to avoid damaging the fan.
Except for the two bearings of the motor rotor, the other parts of the aerator do not have direct contact friction. For bearings that require the addition of lubricating grease, oil should be added regularly, once a month, and for fans that work continuously for three shifts, the number of oil refills should be increased.
Regularly replace the bearings of the aerator fan, and the replacement should be carried out by someone familiar with repair operations.
In summary, the layout and installation of micro porous aerators and oxygen trays at the bottom of fish pond aquaculture involve multiple aspects, including the layout of oxygen trays, selection and installation of fans, as well as the use and maintenance of the system. In practical operation, adjustments and optimizations should be made according to specific situations to ensure that the oxygenation effect is achieved.
