Study on purifying effect of multi-strain probiotics product on water of intensive turbot breeding

On the basis of purifying effect of single strain probiotic bacteria on water of intensive turbot breeding, the purifying effect of multi-strain bacteria product was studied. The results of experiments showed that the free multi-strain mixed bacteria had better purifying effect on turbot breeding water than that of any single-strain bacteria. this phenomenon can be explained with the principle of “ bio-pump”. The immobilized multi-strain probiotics product, bio-film, also showed excellent purifying effect on wate r of turbot breeding. The removal rates of COD and ammonia in 5 days were up to 73.1% and 80.0%, respectively. The concentration of nitrite kept low, which indicated most ammonia had been transformed into nitrate and accumulation of harmful intermediate product-nitrite was decreased. This paper supplied theoretical and technical foundation for saving sea water through bio-purification of wastewater from marine fish culture.