Exploration on the Application of Nano-Sized Spherical Polyelectrolyte Brush as Membrane Antiscalants for Wastewater Treatment

In the process of using reverse osmosis membrane method to treat wastewater, the surface of membrane is easily scaled, which needs adding the corresponding membrane antiscalant, and the quality of membrane antiscalant directly affects the effectiveness and efficiency of wastewater treatment. Nano-sized spherical polyelectrolyte brush with a core-shell structure is synthesized by emulsion polymerization. Under the influence of static electricity and Donnan effect, it has the characteristics of selectively adsorbing counter ions and inhibiting the crystallization of inorganic salts. Therefore, the nano-sized spherical polyelectrolyte brush can be used in wastewater treatment process as an antiscalant. The scale inhibition performance of nano-sized spherical polyelectrolyte brush on CaCO₃, CaSO₄, Al³⁺ is evaluated through dynamic evaluation experiments. The experimental results show that, compared with the imported scale inhibitor ASD-200, the scale inhibition performance of nano-sized spherical polyelectrolyte brush on CaCO₃ and CaSO₄ is improved by 100% and 30%, respectively. Besides, it has excellent resistance performance on Al³⁺.