臭氧与过氧化钙协同降解甲基红废水

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Abstract

The degradation of methyl red in dye wastewater by ozone (O₃) and ozone/calcium peroxide (O₃/CaO₂) was studied. The effects of ozone flow rate, temperature, pH value, initial methyl red concentration, CaO₂ dosage, water matrix were investigated. The optimal conditions for methyl red degradation by O₃ oxidation were:ozone flow rate set as 48L/h, the temperature set as 26℃, the pH set as 6.2. At these optimal conditions, the removal efficiency reached 86.1% after oxidation for 10min. Adding 6.9mmol/L of CaO₂ at these optimal conditions could further accelerate the removal efficiency to 94%. The coexistence of oxalic acid in water would not inhibit the removal of methyl red during O₃/CaO₂ treatment. The O₃/CaO₂ treatment could achieve over 90% of methyl red removal in various real water matrices in 15min. The synergetic effects of O₃ and CaO₂ on methyl red degradation were explored for the first time. The O₃/CaO₂ process could degrade organics effectively and improve the water quality.

Key words： methyl red ozone calcium peroxide synergetic effects

Received: 14 July 2018

PACS:

X703.1

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	Articles by authors
	HAO Si-yu
	ZHANG Ai
	LIU Ya-nan

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HAO Si-yu,ZHANG Ai,LIU Ya-nan. Removal of methyl red in aqueous by O₃/CaO₂ treatment: influencing factors and synergetic effects[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 591-597.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I2/591

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