To remove the main barrier for lignin valorization, which is the development of actual lignin separation technology, we studied the ceramic membrane nanofiltration process using a dense, ultra-thin γ-Al2O3 film-coated porous γ-Al2O3 hollow fiber (γ α HF) membrane for the simultaneous separation of alkali metals (Na+, K+, etc) and concentration of lignin from an alkaline media like black liquor with success as an advanced wastewater treatment process. The γ-AlOOH sol was prepared by sol-gel method and coated by dip-coating on α-Al2O3 hollow fiber (α HF) support. After calcination at high temperature, the mean pore sizes of the α HF support and the γ α HF membrane were found to be 0.2 μm and 1.6 nm. The rejection rate performance for various salts increased in the following order: Na2SO4

Keywords:Lignin Valorization;Ion Removal Process;Hollow Fiber Membrane;Nanofiltration Membrane;Wastewater;Resources