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Continuous electrocoagulation-membrane distillation unit for treating hydraulic fracturing produced water

Journal Article · · Journal of Water Process Engineering
 [1];  [2];  [3];  [4]
  1. University of Arkansas, Fayetteville, AR (United States); Texas Tech University
  2. Texas Tech University, Lubbock, TX (United States)
  3. University of Arkansas, Fayetteville, AR (United States)
  4. University of Arkansas, Fayetteville, AR (United States); Technion—Israel Institute of Technology, Haifa (Israel)
Hydraulic fracturing oil and gas produced water is frequently highly impaired. While it is often deep well injected, there is great interest in treating this water for beneficial uses. Given the complexity of these produced waters, multiple unit operations are necessary. Electrocoagulation has been considered as a promising pretreatment technology. Here electrocoagulation is considered as a pretreatment prior to membrane distillation. The focus of this work is on understanding the electrocoagulation process in order to design an integrated unit operation. Electrocoagulation is used to remove organic compounds that will foul the membrane leading to membrane failure during membrane distillation. Using aluminum or iron electrodes, half-cell reactions in the electrocoagulation cell and electrode potentials have been calculated. Electrocoagulation was conducted using a continuous electrocoagulation reactor with actual produced water using aluminum, iron or mixed aluminum and iron electrodes. Here, the results obtained here indicate that electrocoagulation can obtain good removal efficiency of total organic carbon (TOC) by using different reaction conditions. Removal of organic compounds is essential to minimize fouling during membrane distillation. Further the performance of the electrocoagulation process depends strongly on the quality of the feed water. Insoluble species were more effectively coagulated than dissolved organic species. Continuous electrocoagulation shows great potential as a scalable unit operation for pretreating hydraulic fracturing produced water.
Research Organization:
RAPID Manufacturing Institute, New York, NY (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007888
OSTI ID:
2228425
Journal Information:
Journal of Water Process Engineering, Journal Name: Journal of Water Process Engineering Vol. 50; ISSN 2214-7144
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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