Design and Parameter Optimization of a Full-Scale Wastewater Reclamation Plant Including Pretreatment, Electrodialysis Reversal, and Ion Exchange in Steel Manufacturing Processes
Publication: Journal of Environmental Engineering
Volume 142, Issue 10
Abstract
The daily demand of demineralized water (DMW) in electrolytic galvanizing line (EGL) in China Steel Corporation (CSC) reached approximately as the production line was fully in operation. However, the wastewater produced from the EGL was discharged into the cold-rolling mill wastewater treatment plant even though it had potential for reclamation. This study provides details of design and parameter optimization of a full-scale wastewater reclamation plant for the EGL. Three wastewater streams including hot water rinse, pickling rinse wastewater, and condensate water from the EGL were selected for reclamation. The full-scale wastewater reclamation plant was constructed to equip with coagulation, flocculation, sedimentation, and filtration for pretreatment, and electrodialysis reversal (EDR) and ion exchange (IX) processes for desalination. The pretreatment process can reduce the total iron concentrations in the wastewater from 40–70 ppm to to protect EDR membranes from fouling. The EDR systems can reduce the conductivity of the pretreated wastewater from to (i.e., desalination rate). The plant is capable of supplying of reclaimed pure water to the EGL from selected wastewater streams with the total flow rate of (i.e., recovery rate). The cost of the reclaimed water was cheaper than the DMW produced by regular processes in CSC. The annual saving of the reclamation system, including pure water cost and wastewater treatment cost, was more than 11.6 million New Taiwan dollars (NT$).
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Acknowledgments
The authors gratefully acknowledge the assistant of Mr. Kuan-Chung Chen and Mr. Sheng-Fu Cheng. Their efforts and contributions in this project are appreciated.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 28, 2015
Accepted: Jan 14, 2016
Published online: Apr 18, 2016
Discussion open until: Sep 18, 2016
Published in print: Oct 1, 2016
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