Enhanced organic removal for shale gas fracturing flowback water by electrocoagulation and simultaneous electro-peroxone process

Fan xin Kong, Xiao feng Lin, Guang dong Sun, Jin fu Chen, Chun mei Guo, Yuefeng F. Xie

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Colloids and organics in shale gas fracturing flowback water (SGFFW) during shale gas extraction are of primary concerns. Coagulation combined with oxidation might be a promising process for SGFFW treatment. In this study, a novel electrocoagulation-peroxone (ECP) process was developed for SGFFW treatment by simultaneous coagulation and oxidation process with a Al plate as the anode and a carbon-PTFE gas diffusion electrode as the cathode, realizing the simultaneous processes of coagulation, H2O2 generation and activation by O3 at the cathode. Compared with electrocoagulation (EC) and peroxi-electrocoagulation (PEC), COD removal efficiency mainly followed the declining order of ECP, PEC and EC under the optimal current density of 50 mA cm−2. The appearance of medium MW fraction (1919 Da) during ozonation and PEC but disappearance in ECP indicated that these intermediate products couldn't be degraded by ozonation and PEC but could be further oxidized and mineralized by the hydroxyl radical produced by the cathode in ECP, demonstrating the hydroxyl radical might be responsible for the significant enhancement of COD removal. The pseudo-first order kinetic model can well fit ozonation and EC process but not the PEC and ECP process due to the synthetic effect of coagulation and oxidation. However, the proposed mechanism based model can generally fit ECP satisfactorily. The average current efficiency for PEC was 35.4% and 12% higher than that of ozonation and EC, respectively. This study demonstrated the feasibility of establishing a high efficiency and space-saving electrochemical system with integrated anodic coagulation and cathodic electro-peroxone for SGFFW treatment.

Original languageEnglish (US)
Pages (from-to)252-258
Number of pages7
JournalChemosphere
Volume218
DOIs
StatePublished - Mar 1 2019

Fingerprint

Natural Gas
Fracturing (fossil fuel deposits)
Electrocoagulation
Coagulation
Ozonization
coagulation
Water treatment
Water
water treatment
Cathodes
hydroxyl radical
oxidation
Hydroxyl Radical
Oxidation
water
Electrodes
Diffusion in gases
Polytetrafluoroethylene
Colloids
Water Purification

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Kong, Fan xin ; Lin, Xiao feng ; Sun, Guang dong ; Chen, Jin fu ; Guo, Chun mei ; Xie, Yuefeng F. / Enhanced organic removal for shale gas fracturing flowback water by electrocoagulation and simultaneous electro-peroxone process. In: Chemosphere. 2019 ; Vol. 218. pp. 252-258.
@article{7e844689254c4592b20883d702a718d0,
title = "Enhanced organic removal for shale gas fracturing flowback water by electrocoagulation and simultaneous electro-peroxone process",
abstract = "Colloids and organics in shale gas fracturing flowback water (SGFFW) during shale gas extraction are of primary concerns. Coagulation combined with oxidation might be a promising process for SGFFW treatment. In this study, a novel electrocoagulation-peroxone (ECP) process was developed for SGFFW treatment by simultaneous coagulation and oxidation process with a Al plate as the anode and a carbon-PTFE gas diffusion electrode as the cathode, realizing the simultaneous processes of coagulation, H2O2 generation and activation by O3 at the cathode. Compared with electrocoagulation (EC) and peroxi-electrocoagulation (PEC), COD removal efficiency mainly followed the declining order of ECP, PEC and EC under the optimal current density of 50 mA cm−2. The appearance of medium MW fraction (1919 Da) during ozonation and PEC but disappearance in ECP indicated that these intermediate products couldn't be degraded by ozonation and PEC but could be further oxidized and mineralized by the hydroxyl radical produced by the cathode in ECP, demonstrating the hydroxyl radical might be responsible for the significant enhancement of COD removal. The pseudo-first order kinetic model can well fit ozonation and EC process but not the PEC and ECP process due to the synthetic effect of coagulation and oxidation. However, the proposed mechanism based model can generally fit ECP satisfactorily. The average current efficiency for PEC was 35.4{\%} and 12{\%} higher than that of ozonation and EC, respectively. This study demonstrated the feasibility of establishing a high efficiency and space-saving electrochemical system with integrated anodic coagulation and cathodic electro-peroxone for SGFFW treatment.",
author = "Kong, {Fan xin} and Lin, {Xiao feng} and Sun, {Guang dong} and Chen, {Jin fu} and Guo, {Chun mei} and Xie, {Yuefeng F.}",
year = "2019",
month = "3",
day = "1",
doi = "10.1016/j.chemosphere.2018.11.055",
language = "English (US)",
volume = "218",
pages = "252--258",
journal = "Chemosphere",
issn = "0045-6535",
publisher = "Elsevier Limited",

}

Enhanced organic removal for shale gas fracturing flowback water by electrocoagulation and simultaneous electro-peroxone process. / Kong, Fan xin; Lin, Xiao feng; Sun, Guang dong; Chen, Jin fu; Guo, Chun mei; Xie, Yuefeng F.

In: Chemosphere, Vol. 218, 01.03.2019, p. 252-258.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Enhanced organic removal for shale gas fracturing flowback water by electrocoagulation and simultaneous electro-peroxone process

AU - Kong, Fan xin

AU - Lin, Xiao feng

AU - Sun, Guang dong

AU - Chen, Jin fu

AU - Guo, Chun mei

AU - Xie, Yuefeng F.

PY - 2019/3/1

Y1 - 2019/3/1

N2 - Colloids and organics in shale gas fracturing flowback water (SGFFW) during shale gas extraction are of primary concerns. Coagulation combined with oxidation might be a promising process for SGFFW treatment. In this study, a novel electrocoagulation-peroxone (ECP) process was developed for SGFFW treatment by simultaneous coagulation and oxidation process with a Al plate as the anode and a carbon-PTFE gas diffusion electrode as the cathode, realizing the simultaneous processes of coagulation, H2O2 generation and activation by O3 at the cathode. Compared with electrocoagulation (EC) and peroxi-electrocoagulation (PEC), COD removal efficiency mainly followed the declining order of ECP, PEC and EC under the optimal current density of 50 mA cm−2. The appearance of medium MW fraction (1919 Da) during ozonation and PEC but disappearance in ECP indicated that these intermediate products couldn't be degraded by ozonation and PEC but could be further oxidized and mineralized by the hydroxyl radical produced by the cathode in ECP, demonstrating the hydroxyl radical might be responsible for the significant enhancement of COD removal. The pseudo-first order kinetic model can well fit ozonation and EC process but not the PEC and ECP process due to the synthetic effect of coagulation and oxidation. However, the proposed mechanism based model can generally fit ECP satisfactorily. The average current efficiency for PEC was 35.4% and 12% higher than that of ozonation and EC, respectively. This study demonstrated the feasibility of establishing a high efficiency and space-saving electrochemical system with integrated anodic coagulation and cathodic electro-peroxone for SGFFW treatment.

AB - Colloids and organics in shale gas fracturing flowback water (SGFFW) during shale gas extraction are of primary concerns. Coagulation combined with oxidation might be a promising process for SGFFW treatment. In this study, a novel electrocoagulation-peroxone (ECP) process was developed for SGFFW treatment by simultaneous coagulation and oxidation process with a Al plate as the anode and a carbon-PTFE gas diffusion electrode as the cathode, realizing the simultaneous processes of coagulation, H2O2 generation and activation by O3 at the cathode. Compared with electrocoagulation (EC) and peroxi-electrocoagulation (PEC), COD removal efficiency mainly followed the declining order of ECP, PEC and EC under the optimal current density of 50 mA cm−2. The appearance of medium MW fraction (1919 Da) during ozonation and PEC but disappearance in ECP indicated that these intermediate products couldn't be degraded by ozonation and PEC but could be further oxidized and mineralized by the hydroxyl radical produced by the cathode in ECP, demonstrating the hydroxyl radical might be responsible for the significant enhancement of COD removal. The pseudo-first order kinetic model can well fit ozonation and EC process but not the PEC and ECP process due to the synthetic effect of coagulation and oxidation. However, the proposed mechanism based model can generally fit ECP satisfactorily. The average current efficiency for PEC was 35.4% and 12% higher than that of ozonation and EC, respectively. This study demonstrated the feasibility of establishing a high efficiency and space-saving electrochemical system with integrated anodic coagulation and cathodic electro-peroxone for SGFFW treatment.

UR - http://www.scopus.com/inward/record.url?scp=85059307680&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85059307680&partnerID=8YFLogxK

U2 - 10.1016/j.chemosphere.2018.11.055

DO - 10.1016/j.chemosphere.2018.11.055

M3 - Article

C2 - 30471506

AN - SCOPUS:85059307680

VL - 218

SP - 252

EP - 258

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

ER -