Combination of the direct electro-Fenton process and bioremediation for the treatment of pyrene-contaminated soil in a slurry reactor

doi:10.1007/s11783-015-0804-z

Front. Environ. Sci. Eng.

2015, Vol. 9

Issue (6) : 1096-1107 https://doi.org/10.1007/s11783-015-0804-z

RESEARCH ARTICLE

Combination of the direct electro-Fenton process and bioremediation for the treatment of pyrene-contaminated soil in a slurry reactor

Wendi XU^1,²,Shuhai GUO^1,^*(

),Gang LI¹,Fengmei LI¹,Bo WU¹,Xinhong GAN^1,²

1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract

A combined treatment technology (DEF-BIO) using the direct electro-Fenton (DEF) process and bioremediation (BIO) was established in this study. The performance of the DEF-BIO process on the remediation of a pyrene (PYR)-contaminated soil was evaluated in a slurry reactor. The appropriate order of application was to conduct the DEF process followed by BIO, evaluated through analysis of the degradation characteristics of each process individually. In addition, the application time of the DEF process affected the efficiency of the combined process. The optimum time to apply the DEF process was determined through an analysis of the induced changes in PYR intermediates, pH, soil organic matter (SOM) and bacteria. The optimum application time of the DEF process was 6 h. All the induced changes were beneficial for the BIO phase. The removal of PYR was 91.02% for DEF–BIO after 72 h, and the efficiency was almost 50% increased, compared with the individual DEF and BIO treatments. Therefore, the combined process of DEF–BIO process may be an efficient and promising method for the remediation.

Keywords direct electro-Fenton bioremediation slurry reactor combined process pyrene

Corresponding Author(s): Shuhai GUO

Online First Date: 17 July 2015 Issue Date: 23 November 2015

Cite this article:

Bo WU,Xinhong GAN,Wendi XU, et al. Combination of the direct electro-Fenton process and bioremediation for the treatment of pyrene-contaminated soil in a slurry reactor[J]. Front. Environ. Sci. Eng., 2015, 9(6): 1096-1107.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-015-0804-z
https://academic.hep.com.cn/fese/EN/Y2015/V9/I6/1096

Fig.1 Degradation ratios (a), residual concentrations (b) and degradation rates (c) of PYR during the DEF (test B) and BIO (test A) processes; insert in (c): fitting models for the DEF and BIO tests

Fig.2 Concentrations of ·OH during the DEF process (test B) and total microbial 16S rRNA gene copy numbers during the BIO process (test A)

Fig.3 Change in pH during the DEF process. Insert: the buffering capacity of the soil

Fig.4 PYR degradation ratio (a) and the residual PYR concentration (b) during the DEF–BIO experiments and the effect of the DEF process time period (D1: DEF 6 h, D2: DEF 12 h, D3: DEF 18 h, D4: DEF 24 h). Inserts to (a): degradation rates of PYR and the fitting model for each BIO phase

Fig.5 Temporal changes of the total microbial 16S rRNA gene copy numbers in the DEF–BIO slurry reactor

Tab.1 Sequences of prominent bands in the DGGE gels

Tab.2 Main intermediates and the percentages of intermediates (monocyclic and acyclic) and PYR

Fig.19 Changes of SOM (a) and residual PYR in the solid- and aqueous-phases (b) during the DEF process

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