Study on bioremediation of eutrophic lake

Bioremediation is considered as one of the effective ways to deal with the pollution of natural water because of its high efficiency, low cost and causing no secondary pollution. The multiple microbial preparation is composed of bacteria that can transfer nutritive material harmless and some natural humic acid which can destroy algae. The qualified bacteria were selected, separated, and enriched from the water and bottom sediment of eutrophic lake. A field trial of bioremediation was carried out in 60 m³ of eutrophic water body in Yingze Lake of Anshan for four months. TN (total nitrogen), TP (total phosphorus), ammonia nitrogen, COD_Cr, and turbidity of the trial water and untreated water were measured termly. Contrastive analysis showed the mulriple microbial preparation can increase the water capacity of self-purification, decrease the turbidity, inhibit algae growth and improve water quality gradually at substantially lower cost. Thus the problem of lake eutrophication can be solved radically by bioremediation.