Removal of phenol from highly salty organic wastewater using photothermal membrane distillation process
Membrane distillation has a theoretical retention rate of 100％for nonvolatile substances.However,its ability of removing volatile substances is not satisfactory.In this work,photothermal membrane distillation was used to in-situ heat membrane surface by solar energy,which improved temperature polarization,increased flux and decreased the phenol-water permeation ratio.CNTs was sprayed on PTFE substrate to prepare the composite membrane which has excellent photothermal conversion performance.The light absorption of the composite membrane was 90.64％within the full spectrum range,and the surface temperature of it increased to(61±1)℃ under an irradiance of 1 sun.The results of photothermal membrane distillation using 200 mg/L phenol and 3.5％NaCl solution as the feed solution(35 ℃)show that a 34.4％increasing of water flux compared to the dark condition and solar energy utilization efficiency of 33.1％.while the salt rejection remained above 99.9％.The phenol separation was significantly improved compared photothermal membrane distillation to traditional membrane distillation under various conditions.The phenol-water permeation ratio decreased by 35.2％under 1 sun.
NETL
NSTL
万方数据
维普
