Efficiency assessment and optimization of the sulfite/UV process for reductive dehalogenation

TENG Long; XIE Bihuang; LI Xuchun

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Efficiency assessment and optimization of the sulfite/UV process for reductive dehalogenation

TENG Long,XIE Bihuang,LI Xuchun *

School of the Environment, Nanjing University, Nanjing 210023, China

*Correspondence author

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Funding: the National Natural Science Foundation of China （No.21307057）, Specialized Research Fund for the Doctoral Program of Higher Education （No.SRFDP, 20130091120014）, the Natural Science Foundation of Jiangsu Province （No.BK20130577）

Opened online:18 September 2016

Accepted by: none

Citation: TENG Long,XIE Bihuang,LI Xuchun.Efficiency assessment and optimization of the sulfite/UV process for reductive dehalogenation[OL]. [18 September 2016] http://en.paper.edu.cn/en_releasepaper/content/4704345

The sulfite/UV process is an promising alternative to remediation of a wide variety of recalcitrant contaminants such as halogenated organic compounds by producing powerfully reducing species, hydrated electron (eaqˉ). This study was intended to assess the efficiency of the process and to optimize the system. Selecting monochloroacetic acid (MCAA) as the simple model compound, energy efficiency of the reductive dehalogenation by the process was assessed based on the degradation kinetics of MCAA. The energy efficiency was analyzed by taking into account both of the electric energy input and chemicals consumption. The energy efficiency generally increased with increasing UV dose while showing a parabolic profile with respect to S(IV) dosage. Thus, the process could be optimized by controlling UV dose and S(IV) dosage in tandem, and several optimization approaches were also proposed and discussed. The process still shows effects in reducing MCAA in the realistic surface water, and the efficiency EE/O for reductive dehalogenation was estimated to be about18.6 kWh m-3 order-1 by the sulfite/UV process, suggesting that the process was efficient and promising in destroying many recalcitrant contaminants.

Keywords:Environmental Engineering; hydrated electron; sulfite/UV process; dehalogenation; kinetics; efficiency

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