Remediation Technology On Surface Water And Function Of Phosphorus Bacteria For Phosphorus Recycling In Sediment

In the past twenty years, water quality of surface water has been more and more serious in our country. The releases from sediment also resulted in the water quality deterioration. Phosphorus bacteria in sediment functioned in the phosphorus recycling. The research of remediation technology on polluted surface water and mechnism of phosphorus bacteria on phosphorus recycling in sediment was carried out, and following achievements were obtained.1. Three levels of oxygen concentration were setup in experiment, which were high dissolved oxygen concentration (DO>7.0mg/L), medium dissolved oxygen concentration (DO=5.0±0.5mg/L), and low dissolved oxygen concentration (DO<1.0mg/L). Results showed that the optimum oxygen concentration were to keep at 5.0mg/L Under the optimum operation, ammonia-N concentration declined, and also the TN and TP in overlying water. The low dissolved oxygen concentration in experimental system accelerated the releases of ammonia-N, TN and TP from sediment.2. Floating hydrophytes and submerged hydrophytes were planted in sediment-water system. Results showed that growth of hydrophytes accompanied with adsorption of nutrients resulting the declination of TN and TP concentration in overlying water. The proportion of TN and TP adsorbed by hydrophytes accounted for 40% in the total removed TN and TP in system. Above all, short food chain in sediment-water system came into being quickly.3. Technology of bio-barrier supplemented with aeration was experimented in...