Impact of addition of amendments on the degradation of DDT and its residues partitioned on soil

Singh, Swatantra P.; Bose, Purnendu; Guha, Saumyen; Gurjar, Suresh Kumar; Bhalekar, Santosh

doi:10.1016/j.chemosphere.2013.04.025

Cited by 20 publications

(26 citation statements)

References 40 publications

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“…Although the Fe(III) reduction will complete with reductive dechlorination for the direct electrons of H 2 , the Fe(II) produced from Fe(III) reduction can supply electrons for reductive dechlorination, and the numerous Fe‐reducing bacteria stimulated by Fe oxide can participate in reductive dechlorination. Although the previous studies have reported that zerovalent Fe is a good reducing agent and an excellent electron donor for microbial growth and the transformation of DDT and other chlorinated organic compounds (Dombek et al, 2001; Yao et al, 2006; Singh et al, 2013), it is impractical to apply a large quantity of zerovalent Fe to remedy contaminated soils at the field scale. In contrast, our study demonstrated that some soils, such as Hydragric Acrisols, which contain abundant Fe(III) oxides, have a great potential for self‐purification of chlorinated organic pollutants.…”

Section: Discussionmentioning

confidence: 99%

Electron Donor Substances and Iron Oxides Stimulate Anaerobic Dechlorination of DDT in a Slurry System with Hydragric Acrisols

Liu

Cade-Menun

et al. 2016

J. Environ. Qual.

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The interactive effects between electron donor substances and iron (Fe) oxides have significant influence on electron transfer and the growth of Fe-reducing bacteria, which may affect the reductive dechlorination of 1,1,1-trichoro-2,2-bis(p-chlorophenyl)ethane (DDT) in soils. To evaluate the roles of volatile fatty acids and Fe(III) oxide in accelerating the reductive dechlorination of DDT in Hydragric Acrisols, a batch anaerobic incubation experiment was conducted in a slurry system with the following seven treatments: sterile soil, control (DDT-contaminated soil), lactic acid, propionic acid, goethite, lactic acid + goethite, and propionic acid + goethite. Results showed that after 20 d of incubation, DDT residues for these treatments decreased by 34, 65, 77, 81, 77, 90, and 92% of the initial quantities, respectively, with 1,1-dichloro-2,2-bis(4-chlorophenyl)-ethane as the dominant metabolite. The application of lactic acid had no significant effect on DDT dechlorination in the first 8 d while the methanogenesis rate increased quickly but accelerated DDT dechlorination after Day 8 while the methanogenesis rate decreased and Fe(II) contents increased. The application of propionic acid enhanced DDT dechlorination rates throughout the incubation. The amendment by goethite stimulated microbial reduction of Fe(III) oxides to generate Fe(II), which was an efficient electron donor, thus accelerating DDT dechlorination significantly in the early incubation period. A synergetic interaction that accelerated DDT dechlorination, either between lactic acid and goethite or between propionic acid and goethite, was obtained. The results will be of great significance to develop efficient in situ remediation technology of DDT-contaminated soil.

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Section: Discussionmentioning

confidence: 99%

Electron Donor Substances and Iron Oxides Stimulate Anaerobic Dechlorination of DDT in a Slurry System with Hydragric Acrisols

Liu

Cade-Menun

et al. 2016

J. Environ. Qual.

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“…Aer the HDC over Pd/C catalyst, the extract was converted into 1,1-diphenylethane (DPE) which was easily biodegraded. 48 The two sections will be discussed separately.…”

Section: Resultsmentioning

confidence: 99%

Remediation of DDTr contaminated soil by the combination of solvent extraction and catalytic hydrodechlorination

Luan

Liu

et al. 2015

RSC Adv.

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A combination technique for remediation of DDT and its metabolites (DDTr) contaminated soil based on successive steps of solvent extraction, followed by catalytic hydrodechlorination (HDC) was studied.Firstly, solvent extraction was applied to extract DDTr contaminated soil at ambient temperature and pressure. According to GC-MS analysis, the extracts from DDTr contaminated soil are mainly composed

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“…The effectiveness of ZVI partly depends on its surface area to mass ratio and hence, nano‐scale zero‐valent iron (NZVI) particles are generally more effective than micron‐scale zero‐valent iron (MZVI) particles for degradation of pollutants . Zero‐valent iron interaction with chlorinated organic compounds in reductive environments generally proceeds via the reductive dechlorination process, resulting in step‐wise elimination of chlorine molecules from the chlorinated compound …”

Section: Introductionmentioning

confidence: 99%

Degradation kinetics of Endosulfan isomers by micron- and nano-sized zero valent iron particles (MZVI and NZVI)

Singh

Bose

2015

J. Chem. Technol. Biotechnol.

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BACKGROUND The pesticide Endosulfan is commercially available as a mixture of two conformal isomers, i.e. Endosulfan‐1 (Endo‐1) and Endosulfan‐2 (Endo‐2). Endosulfan has been characterized as extremely toxic by USEPA and is persistent in nature. In this study micron‐ and nano‐sized zero‐valent iron particles (MZVI and NZVI) were used for rapid degradation of the Endosulfan isomers. RESULTS Both Endo‐1 and Endo‐2 undergo abiotic hydrolysis resulting in the formation of equi‐molar quantities of Endosulfan alcohol. During interaction with MZVI, the degradation rates of both Endo‐1 and Endo‐2 were observed to be pseudo‐first‐order and the surface normalized degradation rate constants (ks) were 6.33 × 10−4 L h−1 m−2 and 6.38 × 10−4 L h−1 m−2 for Endo‐1 and Endo‐2, respectively. During interaction with NZVI, ks values for Endo‐1 and Endo‐2 were 2.58 × 10−2 L h−1m−2 and 1.21 × 10−2 L h−1 m−2, respectively. GC‐MS analysis showed evidence of the formation of partially dechlorinated by‐products due to Endo‐1 and Endo‐2 interactions with MZVI and NZVI. CONCLUSIONS Surface area normalized degradation rate constants (ks) for Endo‐1 and Endo‐2 degradation by NZVI were 40 and 19 times higher, respectively, than the corresponding values by MZVI. This indicates higher reactivity of the NZVI surface vis‐à‐vis Endo‐1 and Endo‐2 degradation. Partially dechlorinated by‐products observed during interaction of Endo‐1 and Endo‐2 with NZVI and MZVI may be less toxic and more amenable to subsequent biodegradation than the parent compounds. © 2015 Society of Chemical Industry

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Impact of addition of amendments on the degradation of DDT and its residues partitioned on soil

Cited by 20 publications

References 40 publications

Electron Donor Substances and Iron Oxides Stimulate Anaerobic Dechlorination of DDT in a Slurry System with Hydragric Acrisols

Electron Donor Substances and Iron Oxides Stimulate Anaerobic Dechlorination of DDT in a Slurry System with Hydragric Acrisols

Remediation of DDTr contaminated soil by the combination of solvent extraction and catalytic hydrodechlorination

Degradation kinetics of Endosulfan isomers by micron- and nano-sized zero valent iron particles (MZVI and NZVI)

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