A Study Of Ecological Restoration Effect Of Upstream Of Zhuan Chi River In Chao Hu City

Eutrophication of urban rivers not only affects the living and production of nearby residents,but also restricts the development of society and economy.Rehabilitation of eutrophic rivers by ecological restoration technology is the main trend to adapt to the current urban river management,and is also in conform to China's basic principles of environmental protection.Based on the National 12th Five-Year Water Project,"Improvement and Comprehensive Demonstration of Urban Water Environment Quality in Chaohu City",this paper takes the upstream of Zhuanchi River in Chaohu City as an example to carry out the experimental and engineering demonstration research on the incoming water from the upper Zhuanchi River.The effects of constructed wetland and multi-level oxidation ponds on the ecological reconstruction of the Zhuanchi River and the demonstration benefit of the ecological restoration project and propose optimization Suggestions of existing projects.The purpose is to provide reference for the use of ecological restoration technology to rebuild the healthy development of urban river network system and urban river management and restoration.In this paper,through the strengthened the coagulation experiment of Zhuanchi River water body we found that the:?1?Taking turbidity as the main reference index,combined with the removal of organic matter,total phosphorus and other selected110mg/L of PAFC and 1.6mg/L of PAM combination of the best,turbidity reached 94.4%,phosphorus removal rate reached 70%,total organic matter removal rate reached 62%.In this paper,the use of three-dimensional fluorescence,gene libraries and other technologies,combined with water quality physical and chemical indicators,phytoplankton and other indicators of wetland research found that:?1?Whether it is constructed wetlands or wetlands,dissolved organic matter is mainly protein-like,type of fulvic acid,soluble microbial products.Among them,the removal rate of class proteins,tryptophan removal rate,removal rate of total organic carbon,removal rate of COD_Cr and bacterial species are same:vertical wetland>horizontal wetland.?2?In both horizontal and vertical wetlands,the dominant algae of the wetland in the spring were the cyanobacteria,and the dominant algae of the summer wetlands became the antifouling crypto,cyanobacteria,and green algae.?3?Vertical wetland removal of COD_Cr was better than horizontal wetlands.Combined with the results of gene library analysis,the dominant bacteria in vertical wetlands were Uncultured beta proteobacterium,Rhodococcus,Pseudomonas,the dominant bacteria in horizontal wetlands were Acidovorax sp,Ralstonia sp,Acidovorax facilis and endophytic bacteria,The vertical wetland substrate and plant roots provide an aerobic-facultative-facultative anaerobic-anaerobic microenvironment during biofilm formation,which is more favorable than aerobic-facultative-anaerobic microenvironments in horizontal wetlands More conducive to nitrification,denitrification reaction,and promote the removal of organic carbon.In this paper,through the study of multi-level oxidation ponds found that:?1?Oxidation pond water,there are three main organic matters are protein-like,type of fulvic acid and soluble microbial products.Among them,Grade?oxidation ponds have a better removal effect on organic matter than Grade?oxidation ponds.?2?The trend of algae species is similar to that of wetland,but the proportion of cyanobacteria in summer is higher than wetlands,of which the proportion of cyanobacteria in grade?oxidation ponds is as high as 31.52%.?3?According to the analysis of gene library,there are mainly facultative anaerobic bacteria such as Uncultured beta proteobacterium,Epsilonproteobacteria and Oxalobacteae in Grade?oxidation ponds.Class?oxidation ponds have more bacterial species than Grade?oxidation ponds,forming an aerobic-facultative-anaerobic microenvironment.In the actual project,if we want to achieve the standard of effluent quality of the Zhuanchi River to meet and meet the Class IV standard of National Surface Water Environmental Quality Standard?GB3838-2002?,we should improve the Grade I oxidation pond system.Considering the actual situation,Algae pond density has been very large,it is proposed to transform it into an efficient algae oxidation ponds,high efficiency algae ponds covers an area of small,simple operation and management,no odor when running,shallow depth of only 0.2m to 0.6m,safe Sex high suitable for residential areas near.In this paper,the fluorescence characteristics of dissolved organic compounds and gene library technology were used to explore the effect of constructed wetlands and multi-stage oxidation ponds on the restoration of incoming water in the upper Zhuanchi River.Based on the experimental results,some suggestions for improvement were proposed for these ecological restoration projects.Eutrophication provides the theoretical basis and technical support.