Journal
JOURNAL OF WATER PROCESS ENGINEERING
Volume 16, Issue -, Pages 149-162Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jwpe.2016.11.003
Keywords
Shale gas wastewater; Electrocoagulation; Total organic carbon; Hardness; Conductivity
Funding
- University Grants Commission, New Delhi, India [F.5-64/2007 BSR]
Ask authors/readers for more resources
The present study explores the feasibility of using the electrocoagulation (EC) process for the treatment and reuse of wastewater produced during shale gas recovery by hydraulic fracturing. The electrocoagulation process has been evaluated for the removal of suspended solids, total organic carbon (TOC) and scale (hardness) causing divalent cations, which, if untreated, can clog the gas well. Experiments were performed with actual shale gas wastewater (ASWW), synthetic shale gas wastewater prepared with low concentration of dissolved salts (SSWW - LDS) and synthetic shale gas wastewater prepared with a high concentration of dissolved salts (SSWW - HDS). EC is found to be effective for removing TOC and hardness from both the actual and synthetic shale gas wastewaters. The electric energy required per unit mass (E-EM) for removal of TOC for ASWW, SSWW - LDS and SSWW - HDS are 243, 102 and 70 kWh/kg respectively. The EEM for removal of hardness for ASWW, SSWW - LDS and SSWW - HDS are 303, 104 and 25 kWh/kg respectively. The high conductivity of SSWW - HDS helps in achieving higher currents and hence the lower reported EEM values for SSWW - HDS. Also, under alkaline conditions, the performance of EC increases significantly. Combination of aeration with EC is also found to increase the performance of EC, especially for wastewater containing high concentrations of chloride ions. (C) 2016 Published by Elsevier Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available