Study On Purification Of Eco-original Bacteria Group On Nitrogen And Dissolved Organic Matter Pollution In Shallow Sea Aquaculture Region

Shallow sea aquaculture had been well developed in recent years. But, the problem cost of large amont of ammonium, nitrite and organic matter in culture region was still serious,which induced the death of marine animal.the sustainable development of shallow sea aquaculture was blocked. Bacteria have the characteristics of various adaptbility. So, there must exist effective bacteria in ecological environment. It was a common and effective means to removal pollutants with bacteria from nature.First, we gathered eco-original bacteria group from shallow sea cage culture region and tried to elevate its capability to remove NH4+-N, NO2--N and organic matter in culture region with the regulation of conditions and the adding of glucose.Also, eco-original bacteria group was compared with several artificial bacteria groups and some commercial microbial products about the capability to removal NH4+-N, NO2--N and organic matter. The result showed that eco-origical bacteria group had the higher purification ability than both aritfical bactaria groups and the compared commercial products.At the same time, the effects of various kinds of conditions which could influence the removal ability of eco-original bacteria group were studied. The optimium removing conditions were determined . When the added amount of compound bacteria was 3%,treating time was 4days,temperature was 30±2℃, pH value was 8.1±0.2,the added amount of glucose was 2g/L and salinity was 30±10g/L, the purification got the best result, with removal rate of ammonia,nitrite and COD 79.1%,85.2% and 88.7%, respective1y. It provided experimental basic for the culture and application of eco-original bacteria group. Finally, the pollutant-removing ability was detected after the eco-original bacteria group was immobilized with corallite, plastic ball and china cycle, the result indicated that the immobizing effect of corallite was better than the other two carriers. Then simulate experiments were carried out to detect the ability of immobilized eco-original bacteria group to remove NH4+-N, NO2--N and organic matter from recycling shrimp culture, the result indicated that the bactia group still keep its good pufification ability in simulated recycling aquaculture enronment.