Polyvinylidene Fluoride (PVDF) ultrafiltration (UF) membranes are being widely used in water and wastewater treatment due to their excellent chemical and mechanical stability. However, the major shortcoming of these membranes is their strong hydrophobicity resulting in rapid flux decline and frequent back-flushing requirements which will shorten the life span of the membranes. Therefore, it is very important to enhance the hydrophilicity and mechanical strength of PVDF membrane. A common industrial practice to improve the hydrophilicity of PVDF is to add in hydrophilic additives such as polyethylene glycol (PEG) or polyvinyl pyrrolidone (PVP) into the dope solution. However, the main drawback of this methodology is that, these hydrophilic additives are highly water soluble and hence, over time, the hydrophilicity of the PVDF membrane will be reduced. FIRMBASE’s hydroxyl functionalized polymer (4483) is added to solve this problem.
The hydroxyl functionalized polymer (4483) enables the formation of hydrogen bonds with water and thereby enhanced the permeability of the membrane. The monodispersed and highly branched macromolecules structure of this specialty polymer provides improved porosity and pore size distribution in the membrane for improve mechanical strength and anti-fouling. Lengthening the operations uptime of the membrane, increasing the clean water flux, and reducing the energy requirements.
1. Clean Water Flux (LMH/bar)) increased by >25%
2. Operating Pressure (bar) reduced by >33%
3. Contact Angle (degree) reduced by > 15%