Simulation Research On Co-immobilized Algal-bacterial Symbiosis System Bioremeded Eutrophicated Water

The eutrophication of water bodys have negative effect on water ecological environment and quality of drinking water.Cosquently,the bioremediation of eutrophicated water body is ,important issue to be solved imperiously in environment field.The operation of PVA and sodium alginate embedded fixation is quite simple, and achieved in relatively mild conditions, which has no toxic effect on cells. Light transmission and mass transfer performance of the small balls are better. Not only the vector do not hinder the algae cell proliferation, but also can protect the cells.The effects of bioremediation of eutrophicated water by immobilized algal-bacterial symbiosis system were conducted under three different conditions, and the best condition was determined,namely immobilized algal-bacterial according to ratio of 1:1,neither of them were diluted,and the optimum ratio of immobilized algal-bacteria ball to water is 78mL/L.Under this condtion, totoal phosphorus removal capacity from 1.05mg/L to 0.13mg/L with 87.6%,total nitrogen removal capacity from 9.76mg/L to 2.63mg/L with 64.9%,and the permanganate index removal capacity from 13.69mg/L to 5.06mg/L with 63.0%.The effect of co-immobilized algal-bacterial symbiosis system to the bioremediation of eutrophicated water body is very good, had the function of purification to eutrophicated water body ,and this method is very cheap.Generally,algal-bacterial symbiosis has many advantages such as no energy consumption. Oxygen released by algae provide oxygen for the growth of microbes.CO2 emitted by microbial provide the carbon source for the growth of algae.Therefore, immobilization of bacterial and algae can increase the bacteria-algae concentration dramatically, which can play an important role in purifying water.