DOI: 10.1016/j.watres.2019.02.007
Scopus记录号: 2-s2.0-85062227715
论文题名: High water recovery and improved thermodynamic efficiency for capacitive deionization using variable flowrate operation
作者: Ramachandran A. ; Oyarzun D.I. ; Hawks S.A. ; Stadermann M. ; Santiago J.G.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 155 起始页码: 76
结束页码: 85
语种: 英语
英文关键词: Capacitive deionization
; High water recovery
; Improved thermodynamic efficiency
; Variable flowrate operation
; Water desalination
英文摘要: Water recovery is a measure of the amount of treated water produced relative to the total amount of water processed through the system, and is an important performance metric for any desalination method. Conventional operating methods for desalination using capacitive deionization (CDI) have so far limited water recovery to be about 50%. To improve water recovery for CDI, we here introduce a new operating scheme based on a variable (in time) flow rate wherein a low flow rate during discharge is used to produce a brine volume which is significantly less than the volume of diluent produced. We demonstrate experimentally and study systematically this novel variable flowrate operating scheme in the framework of both constant current and constant voltage charge-discharge modes. We show that the variable flowrate operation can increase water recovery for CDI to very high values of ∼90% and can improve thermodynamic efficiency by about 2- to 3-fold compared to conventional constant flowrate operation. Importantly, this is achieved with minimal performance reductions in salt removal, energy consumption, and volume throughput. Our work highlights that water recovery can be readily improved for CDI at very minimal additional cost using simple flow control schemes. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121917
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Aeronautics & Astronautics, Stanford University, Stanford, CA 94305, United States; Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, United States; Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, United States
Recommended Citation:
Ramachandran A.,Oyarzun D.I.,Hawks S.A.,et al. High water recovery and improved thermodynamic efficiency for capacitive deionization using variable flowrate operation[J]. Water Research,2019-01-01,155