Optimization of reverse osmosis desalination process of brackish water based on response surface method
In order to cope with the shortage of fresh water resources and improve the performance of reverse osmosis(RO)process in brackish waters,a single-stage multi-channel low-pressure reverse osmosis pilot device was designed,and a simulation and optimization model for RO desalination process of brackish water was established using Box-Behnken response surface analysis method(RSM).Under various conditions of feed concentration,influent flow rate and the ratio of concentrated water to fresh water,the salt rejection rate and membrane permeation flux of the system were investigated,and the performance index and specific energy consumption(SEC)of the system were analysed and calculated.The results showed that feed concentration and the ratio of concentrated water to fresh water were significant factors affecting the rejection rate.Higher influent flow at low feed concentration could not significantly increase the salt rejectionrate,but increase the specific energy consumption of the equipment.Under the condition of 5000mg/L feed concentration,when the influent flow rate was controlled to be 258.02L/h and the ratio of concentrated water to fresh water was l.39,the best desalination performance could be achieved,the performance index was 10.58L/(m2·h),and the relative lowest specific energy consumption was 5.15(kW·h)/m3.The constructed RSM model was able to simulate the process of reverse osmosis desalination of brackish water,and the SEC was well predicted with R2 value of 0.9925,and the rejection rate was predicted with RMSE value only of 0.36.The RSM model could optimize the process conditions under different feed concentrations,and guide the long-term efficient operation of RO desalination process.
万方数据
维普
