Fresh water recirculating water aquaculture is generally varieties with high added value. Such as gem perch, light high density cultivation, such as fish, giant salamander and lip. Use of circulating water aquaculture system equipment to deal with water quality, to reduce pollution, increase production, optimization quality, anti-season sale purpose. And ordinary tilapia and four fish, because the market price factors, the necessity of the circulating water is not strong.
Fresh water recirculating water aquaculture system's main purpose is to the quality index of temperature, Dissolved oxygen, ammonia nitrogen, nitrite and other main factors control within a reasonable range. Because fresh water salinity is lower, so do not use in the application of protein separator filter. While using the bag filter, etc. After micro filter filtration, large particles of organic matter has been completely filtering water, after comparison precision of bag filter. Most of the solid particles were filtered clean. Organic matter of less than 10 microns, contains some useful materials such as algae.
After The temperature of the heater or chiller processing, after UV sterilizer. Of the bacteria in the water, especially to kill harmful bacteria and viruses. Water injection in biological filter again.
Because of the requirement of biological filter is relatively strict, beneficial nitrifying bacteria such as training cycle is long. Can quantitative regularly to join in the biological filter certain beneficial bacteria for regulation and intervention. Even so. The processing capacity of biological filter is often limited. So we suggest to fresh-water fish food symbiotic system embedded in circulating water system. Hydroponic plants developed root system not only can absorb ammonia nitrogen and nitrite in water and other substances that are toxic for the fish and shrimp, but also can be used as a carrier of the beneficial bacteria attached to hang membrane. Hydroponic plant harvest on a regular basis, you can keep the water up to join the nitrogen completely separate from the water.
Dissolved oxygen system is generally according to the breeding density. If the breeding density, ordinary fan and revealed the trachea can play. If breeding density particularly big, you can use the gas-liquid mixing increases oxygen combined with oxygen bomb.
System is not completely sterile environment. Completely sterile environment for aquatic organisms can be deadly. Therefore, it is not necessary to pursue completely sterile environment. But the harmful bacteria or viruses are controlled within a certain concentration, effectively reduced the probability of aquatic organisms, according to do system is very necessary. Therefore, UV sterilizer is a better choice.
