senior engineer CHINA INSTITUTE OF WATER RESOURCES AND HRDRPOWER RESEARCH, United States
Abstract Submission: The article aims to explore the influence of microorganisms on the treatment effect in the low-temperature contact oxidation process for removing iron and manganese. Low temperature will affect the activity and community structure of microorganisms, thereby affecting the removal effect of iron and manganese. Through comprehensive analysis of relevant literature and detailed analysis of the microbial community structure of two typical rural water plants in Liaoning Province, the basic principles of the process were clarified. The water quality status, microbial community structure, and their correlation with water quality parameters of each water plant were analyzed. The changes in filter media morphology, valence, and microbial community diversity in different seasons were explored. The synergistic effect of microorganisms in iron and manganese removal process and the impact of sand filtration and disinfection process on microbial metabolism were clarified. The results indicate that Proteobacteria is the main dominant phylum, with Gammaproteobacteria being the dominant phylum, while Gallionella and Flavobacteria are the main genera responsible for iron and manganese removal. The microbial community exhibits significant seasonal variations, with significant changes in its composition and structure during winter compared to other seasons. There are significant differences in the surface morphology and oxidation state of manganese sand in different seasons, especially in the form of Mn (II), Mn (III), and Mn (IV) in winter. Some microorganisms are significantly correlated with water quality parameters, especially in winter. Rhodofrax, Brevundimonas, Desulfocapsa, and Thiothrix, which have relatively low abundance, are significantly positively correlated with iron and manganese in winter.
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