影响频繁倒极电渗析技术极限电流密度的因素

Factors affecting limiting current density about frequent reverse electrodialysis technology

采用频繁倒极电渗析技术,考察了膜性能、进水浓度、进水流量对极限电流密度的影响,并考察了电流密度对水的电导率、电渗析膜离子脱除率及装置耗电量的影响。结果表明:当选用AMX与ACS两段阴离子交换膜运行、原水电导率为1 784μS/cm、进水流量为0.69 m^3/h时,极限电流密度值最大,为43.62 A/m^2;当操作电流小于极限电流时,随着电流密度的增大,浓缩水电导率不断增大,产品水电导率不断减小,水中离子的脱除率不断增大;在相同的条件下,当进水流量大时,装置耗电量较低;当进水电导率大时,装置耗电量较低。

The effect of membrane ent con density centration, influent flow on was sal technolo property, influlimiting current investigated by the electrodialysis revergy and the impact of electric current density on conductivity of water, electrodialysis membrane ion removal rate and power consumption of the device was investigated. The results showed that when AMX and ACS two anion exchange membranes were used in operation ductivity was 1 784 μS/cm, 0.69 m3/h, the limiting current maximum value 43. 62 A/m2 ; and feed water coninfluent flow was density reached the when the operating current was less than limiting current, with the increasing of electric current density, conductivity of concentrated water rose continuously, conductivity of product water decreased constantly and removal rate of ion rate in water increased gradually; under the same conditions,when the influent flow was larger, the power consumption of unit was lower; when the conductivity of influent was bigger, the power consumption of unit was lower.