Monitoring Of Plankton And Research Of Evaluation In The Process Of Urban Pollution River Restoration By Staged Floating Treatment Wetlands

Urban River Restoration is a long, arduous and complicated systematic project, therefore, water quality unstable, black-odor rebound, nutrients block and water ecosystem degradation are the pratical problems we met in the process of a long-term treatment of urban river. This work was supported by Major Science and Technology Program for Water Pollution Control and Treatment (2009ZX07317-006) " Research and Demonstration on Sewage Interception, Engineering Remediation and Ecological Restoration of the Malodorous Urban Rivers", polluted river in Shanghai urban area as the research object and simulated distribution of aquatic niche in the natural water, designed a cascade floating bed system through pilot plant and demonstration projects to study the community structure of plankton and water quality purification effect in the process of urban river restoration, provided scientific basis for urban river environmental treatment and ecological restoration.Results show:in the period of pilot system (June 2009～2009 November) and demonstration project (June 2009 to 2010 May) the quality of the water improved Obviously.The pilot system in which the concentration of DO increased 132.6% on average. the average removal rates of NH4+-N, TP, CODCr were 45.8%,50.2%,37.9%. The concentration of DO in the demonstration project increased 123.9% on average. the average removal rates of NH4--N, TP, CODCr were 39.78%,53.7%,37.0%.The algae species which identified in pilot system were 48, whereas 47 were identified in demonstration project. In the two systems, biological density of algae have shown that water is eutrophication, both dominant species were middle indicator species of the sewage. Some diversity index of the pilot system appears a downward trend,but demonstration project have showed an opposite trend. The shannon-wiener index and margalef index in the two systems had shown that water quality are consistent with the results of physical and chemical water quality. Phytoplankton species and CODcr (r=0.305, p<0.05) have a great correlation in the pilot system, which biological density with DO (r=0.129, p<0.05) seeing the same trend. In addition, Phytoplankton species and T (r=0.911,p<0.01),NH4+-N (r=0.392,p<0.05) in demonstration engineering have a great correlation with DO (r=-0.335,p<0.05) showing negative correlation, which biological density and T (r=0.583,p<0.05) also appearing a great correlation.The protozoa species which identified in pilot system were 35, whereas 50 were identified in demonstration project. Genus clock act as indicator species in the two system which nearly all water inflow appearing ditch bell insect or beads bell insect. However, some of water outlet in the pilot system have shown bell-shaped bell insect acting as indicator species of water. Some diversity index of the two system appears a ascent trend. The shannon-wiener index and margalef index in the two systems have shown that water quality are consistent with the results of physical and chemical water quality. Protozoa species and physical and chemical water quality have a little correlation even negative in the pilot system, which biological density and NH4+-N (r=0.459,p<0.05) seeing the maximum correlation. In addition, correlation of protozoa species and physical and chemical water quality in demonstration project are consistent with the pilot system.which biological density and NH4+-N (r=0.288,p<0.05) also appearing the maximum correlation.The rotifer species which identified in pilot system were 15, whereas 27 were identified in demonstration project.The two system primarily appear indicator species in contamination,but the part of sampling points have even no rotifer in the pilot system.Some diversity index of the pilot system appears a ascent trend,but the demonstration engineering have showed an opposite trend.The shannon-wiener diversity index and margalef richness index in the two systems have shown that water quality are consistent with the results of physical and chemical water quality. Rotifer species and and DO(r=0.315,p<0.05)have a maximum correlation in the pilot system, which biological density and DO (r=0.262,p<0.05) seeing the same trend. In addition, rotifer species and T (r=0.579,p<0.01), NH4+-N (r=0.478,p<0.01) in demonstration engineering have a significant correlation, which biological density and T (r=0.345,p<0.05) appearing the maximum correlation.Based on the different niche of aquatic plant.Constructed a cascade of ecological floating bed system, applied to the governance of urban polluted river. monitoring and evaluation in the process of Remediation of contaminated river of its plankton community structure. In order to provide a theoretical basis for river training and technical suppor.