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	Effect of different molecular weight organic components on the increase of microbial growth potential of secondary effluent by ozonation
	Xin Zhao ; Hong-Ying Hu ; Tong Yu ; Chang Su ; Haochi Jiang ; Shuming Liu ; Xin Zhao ; Hong-Ying Hu ; Tong Yu ; Chang Su ; Haochi Jiang ; Shuming Liu
	2016-03-30 ; 2016-03-30
关键词	Wastewater reclamation and reuse Ozonation Assimilable organic carbon(AOC) Molecular weight distribution Biological stability X703 X172
其他题名	Effect of different molecular weight organic components on the increase of microbial growth potential of secondary effluent by ozonation
中文摘要	Ozonation has been widely applied in advanced wastewater treatment. In this study, the effect of ozonation on assimilable organic carbon(AOC) levels in secondary effluents was investigated, and AOC variation of different molecular weight(MW) organic components was analyzed. Although the removal efficiencies were 47%–76% and 94%–100% for UV254 and color at ozone dosage of 10 mg/L, dissolved organic carbon(DOC) in secondary effluents was hardly removed by ozonation. The AOC levels increased by 70%–780% at an ozone dosage range of 1–10 mg/L. AOC increased significantly in the instantaneous ozone demand phase, and the increase in AOC was correlated to the decrease in UV254 during ozonation.The results of MW distribution showed that, ozonation led to the transformation of larger molecules into smaller ones, but the increase in low MW(< 1 k Da) fraction did not contribute much to AOC production. The change of high MW(> 100 k Da and 10–100 k Da)fractions itself during ozonation was the main reason for the increase of AOC levels.Furthermore, the oxidation of organic matters with high MWs(> 100 k Da and 10–100 k Da)resulted in more AOC production than those with low MWs(1–10 k Da and < 1 k Da). The results indicated that removing large molecules in secondary effluents could limit the increase of AOC during ozonation.; Ozonation has been widely applied in advanced wastewater treatment. In this study, the effect of ozonation on assimilable organic carbon(AOC) levels in secondary effluents was investigated, and AOC variation of different molecular weight(MW) organic components was analyzed. Although the removal efficiencies were 47%–76% and 94%–100% for UV254 and color at ozone dosage of 10 mg/L, dissolved organic carbon(DOC) in secondary effluents was hardly removed by ozonation. The AOC levels increased by 70%–780% at an ozone dosage range of 1–10 mg/L. AOC increased significantly in the instantaneous ozone demand phase, and the increase in AOC was correlated to the decrease in UV254 during ozonation.The results of MW distribution showed that, ozonation led to the transformation of larger molecules into smaller ones, but the increase in low MW(< 1 k Da) fraction did not contribute much to AOC production. The change of high MW(> 100 k Da and 10–100 k Da)fractions itself during ozonation was the main reason for the increase of AOC levels.Furthermore, the oxidation of organic matters with high MWs(> 100 k Da and 10–100 k Da)resulted in more AOC production than those with low MWs(1–10 k Da and < 1 k Da). The results indicated that removing large molecules in secondary effluents could limit the increase of AOC during ozonation.
语种	英语 ; 英语
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/144275]
专题	清华大学
推荐引用方式 GB/T 7714	Xin Zhao,Hong-Ying Hu,Tong Yu,et al. Effect of different molecular weight organic components on the increase of microbial growth potential of secondary effluent by ozonation[J],2016, 2016.
APA	Xin Zhao.,Hong-Ying Hu.,Tong Yu.,Chang Su.,Haochi Jiang.,...&Shuming Liu.(2016).Effect of different molecular weight organic components on the increase of microbial growth potential of secondary effluent by ozonation..
MLA	Xin Zhao,et al."Effect of different molecular weight organic components on the increase of microbial growth potential of secondary effluent by ozonation".(2016).

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