Membrane capacitive deionization technology with multi-stage series connection for brine treatment
Membrane capacitive deionization(MCDI)technology has the advantages of simple device,easy operation,easy regeneration,low cost,no pollution,energy saving and so on,which makes it a new desalination technology.In order to improve the desalination performance of MCDI,the water influent of multiple devices was connected in series,and each device was charged separately to explore the influence of its salt removal efficiency(SRE),average salt removal rate(ASRR),energy normalization removal salt(ENRS),and other indicators on the multi-stage series connection.The results showed that under different operating conditions such as influent salt concentration,hydraulic retention time,and voltage,the desalination rate of the second and third stage MCDI series increased by about 2 to 3 times.The desalination rate of the third stage series was slightly improved compared to the second stage series,but it had higher energy consumption.Overall comparison,the desalination performance of the two-stage MCDI series connection was better,and the optimal operating conditions were obtained at 1.5 g·L-1,0.375 min,1.2 V.In the continuous desalination process,multi-stage series connection can continuously and stably remove salt ions,and has a high adsorption capacity,indicating the feasibility of continuous desalination.The research results have a guiding significance for the desalination engineering application of multi-stage MCDI.
membrane capacitive deionizationmulti-stage series connectiondesalination performanceparameter optimizationcontinuous desalination
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