The Preliminary Study On The Application Of Immobilized Probiotics Technique In Aquaculture

In the recent 20 years, with the development of mariculture, intensive mariculture gives off excessive amounts of waste water with high content of nutrients into environment, thus encourages eutrophicatition and red tide in the coastal region. Therefore, people all over the world pay attention to the bioremediation of maricultural wastewater. In this paper, the application of immobilized probiotics technique in aquaculture was studied.In this study, we choosed four cheap and easily available materials as a sorbent, including activated carbon, diatomite,"mai-fan"rock and quartzite to immobilize a probiotics Bacillus firms strain y5. The result showed that after absorbing for 1.5 h, the absorbent rate of actived carbon to the strain of y5 was the highest. In the experiment, through absorbent immobilization, y5 was combined with four carriers including activated carbon, diatomite,"mai-fan"rock and quartzite to artificial maricultural wastewater. After being treated for 48 h, the absorbent rate of the carriers to the strain y5, the contents of COD, NH3, NO2- and NO3- were measured. The results showed that actived carbon was the best carrier in combining with the strain y5 to remedy maricultural waste water.The actived carbon was chosen to absorb the strains PSB and y5, and to remedy the maricultural waster water. After being treated for 48h, the contents of COD, NH3, NO2-, NO3- obviously declined. After being treated for 48 h, the remedied waste water was mixed with unremedied waster water and we observed the follow-up remedy effect of the mixed system. We got an ideal result and so the mixed system can be recycled in the application.