Improvement of water ecosystem of receiving river by urban sewage purification:A case study of Dingshan River Basin
This study designed three types of bypass ecological treatment systems to augment existing purification processes in wastewater treatment plants and industrial effluent management.The focus was on the Dingshan River Basin,aiming to assess the efficacy of these systems in improving river water quality and their impact on microbial communities post-treatment.Utilizing high-throughput sequencing,we examined variations in bacterial and fungal diversity and community structures.Our goal was to provide a comprehensive evaluation of the effects urban sewage has on the receiving river's ecosystem following treatment.The findings indicated a substantial reduction in nutrient salt indicators,such as chemical oxygen demand(COD),ammonium(NH4+-N),and total phosphorus(TP),in the effluent compared to the influent entering the wetland.This demonstrated a marked improvement in water quality.Moreover,the effluent significantly influenced the microbial diversity within the treatment system and the receiving river,leading to an increase in microbial diversity.Statistical analysis of the bypass ecosystem's physicochemical indicators showed enhanced removal efficiencies for COD(55.7%to 64.0%),NH4+-N(63.1%to 89.4%),and TP(27.6%to 76.7%).Consequently,the water quality improved from Grade poor Ⅴ to Ⅲ,according to surface water standards,reflecting a significant enhancement in the receiving river's water quality.This study conducted a comparative analysis of microbial diversity at the ecosystem's inlet and outlet,as well as in the upstream and downstream reaches of the river.The analysis revealed that the dominant bacterial phyla were consistent across all ecological treatment systems when assessed at the phylum level.However,significant variation was observed in the eukaryotic microbial community structure among these systems.The diversity indices,including Chao1,Faith's PD,and Shannon,indicated higher values in the downstream water bodies of the receiving rivers compared to the upstream sections,signifying a substantial increase in species richness and diversity post-treatment.Within the bypass ecosystem,the predominant phyla were Proteobacteria,with a significant range of 77%to 95%,followed by Bacteroidetes(1.0%to 10%),Actinobacteria(0.36%to 12%),and Thick-walled Bacteria.In the receiving river,the dominant phyla were identified as Gammaproteobacteria,Alphaproteobacteria,and Bacteroidia.The examination of microbial community structures has unveiled the complex ecological impacts of the tailwater ecological treatment system on the receiving river.Understanding these impacts is crucial for the comprehensive protection and management of urban river ecosystems.
ecological treatment systemwastewater treatmentriver water qualitymicrobial community structureDingshan River
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