Taking the micro-oxygen hydrolysis and acidification(MHA)of printing and dyeing wastewater(PDW)as the research object,the effect of micro-oxygen concentration on the hydrolysis and acidification(HA)efficiency and acid production efficiency of PDW was explored.The diversity,composition and metabolic function of microorganisms were analyzed.Combined with redundancy analysis(RDA)to analyze the relationship between micro-oxygen concentration,HA efficiency,and microbial composition.Revealing the mechanism of MHA of PDW.The results show that micro-oxygen concentration improves the HA efficiency of PDW.Under micro-oxygen conditions of 0.1～0.3 mg/L,the COD,polyvinyl alcohol(PVA)and decolorization rates are as high as 41.40%,34.03% and 76.96% respectively,and can be biochemically(BOD5/COD)increased from 0.36 to 0.56;the microaerobic concentration increased the relative abundance of Acidobacteria,Bacteroidetes and Firmicutes during the HA process,and the abundance of functional microorganisms related to HA under the microaerobic concentration of 0.1～0.3 mg/L The microorganisms under microaerobic conditions have higher functional abundance for the synthesis and degradation of carbohydrates and the degradation of polymer compounds.These studies can provide reliable technical support for the efficient treatment and resource utilization of PDW.
关键词
印染废水/水解酸化/微氧/有机物降解/微生物群落
Key words
printing and dyeing wastewater/hydrolysis acidification/micro-oxygen/degradation of organic pollutants/microbial community
维普
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