反渗透膜在压电双场源下的脱盐特性

Desalination by Reverse Osmosis under Synergies of Electric Field and Pressure Field

为进一步提高反渗透膜的脱盐性能,将电场施加于反渗透膜系统,形成双场源,建立 处理水量为146 L的中试装置。在低、中以及高盐浓度进水条件下,对比单一压力场和压电双场源 下膜通量、脱盐率和能耗情况。结果表明:外加电场后,反渗透膜的膜通量增大,低、中和高盐浓度 进水对应的膜通量分别增长了 0.6 -1.2,0. 8 ~ 1. 7和1. 8 -4. 2倍;电场对反渗透膜的脱盐率影响 不显著,压电耦合场与单一压力场下的反渗透膜的脱盐率均保持在99%以上;进水盐浓度为3 000 和20 000 mg/L时,耦合系统电耗比单一压力场时的低,最多分别降低了 34%和29. 7%。

To improve the desalination perfomiance of the reverse osmosis membrane, the electric field was coupled with the pressure field of the reverse osmosis membrane and tested in a pilot device with treatment capacity of 146 L. The membrane flux, desalination rate and energy consumption of the reverse osmosis membrane under the single pressure field and under the coupled fields were compared at different influent salt concentrations. The results showed that the membrane flux increased after the electric field was applied, and the increment in the fluxes of low, medium and high salt concentrations was 0. 6 - 1. 2 times, 0. 8 -1.7 times and 1. 8 -4. 2 times, respectively. The effect of electric field on the desalination rate of reverse osmosis membrane was in significant. The desalination rate of the reverse osmosis membrane under the coupled fields and the single pressure field were both above 99% . When the influent salt concentration was 3 000 mg/L and 20 000 mg/L, the power consumption of high pressure pump in the coupled system was lower than that of the single pressure field, and was reduced by up to 34% and 29. 7% , respectively.