双膜曝气生物膜反应器除水中硝氮和高氯酸盐

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Abstract A hydrogen-based membrane aeration biofilm reactor (H₂-MBfR) with carbon dioxide as the sole carbon source was applied for biodegradation of two typical oxidized pollutants (NO₃^--N and ClO₄^-) in simulative groundwater. In order to overcome the secondary pollution and high operation cost, CO₂ was supplied through the membrane aeration as carbon source and to control the pH during denitrification. The experimental results showed that the reactor effluent pH can be controlled relatively stable through the adjustment of H₂ and CO₂ pressure. In first two opreation stages, the CO₂ pressure was 0.05 MPa and 0.08 MPa, respectively, and the average influent concentrations of NO₃^--N and ClO₄^- were 20.73mg/L and 10.57mg/L, respectively, thus the average effluent pH was 8.45 and 8.06, respectively, and the removal rates of NO₃^--N and ClO₄^- were both higher than 95%; When the CO₂ pressure increased to 0.12 MPa in the third stage, the average effluent pH was dropped to 6.93, and the average surface loadings of NO₃^--N and ClO₄^- surface have decreased significantly. And methanation was caused owing to excess CO₂ under the condition of partial acid, which leads to the low reduction rates of goal pollutants. Therefore, reasonable control of the CO₂ pressure was conducive to high efficiencies of NO₃^--N and ClO₄^- reduction.

Key words： carbon source hydrogen-based membrane biofilm reactor pH nitrate perchlorate

Received: 10 February 2016

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	YANG Xiao-xiao
	WANG Zuo-wei
	XIA Si-qing

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YANG Xiao-xiao,WANG Zuo-wei,XIA Si-qing. Bioreduction of nitrate and perchlorate from aqueous solution using hydrogen/carbon dioxide membrane aeration biofilm reactor[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(10): 2972-2980.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I10/2972

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