Fluoropolymers in the Water Industry

Water is the elixir of life, covering about 71% of the Earth's surface. However, despite its abundance, access to clean, safe water is a growing global challenge. Population growth, industrialization, and climate change are placing immense stress on our freshwater resources. As a result, innovative solutions like water treatment and desalination are becoming increasingly essential to meet the world's water needs.

Water treatment is the process of removing impurities, contaminants, and pollutants from water to make it safe for consumption. It involves several steps:

• Coagulation and Flocculation: Chemicals are added to water to create clumps of particles, making them easier to remove.
• Sedimentation: The water is left undisturbed, allowing larger particles to settle to the bottom.
• Filtration: The remaining particles are removed by passing the water through filters made of sand, gravel, or charcoal.
• Disinfection: This step, often done with chlorine or ultraviolet (UV) light, kills or inactivates harmful microorganisms.

Desalination is the process of removing salt and other impurities from seawater or brackish water, making it suitable for drinking and irrigation. It's particularly important in regions with limited freshwater sources, in arid regions like the Middle East and parts of the United States. Two of the common methods of desalination are:

1. Reverse Osmosis (RO): This process involves forcing water through a semipermeable membrane to remove salt and impurities. It's energy-intensive but widely used due to its effectiveness.
2. Distillation: In distillation, water is heated to create vapor, leaving the salts behind. The vapor is then condensed back into freshwater. While energy-intensive, it's especially useful in areas with abundant heat resources.

Fluoropolymers play a significant role in the water industry due to their unique properties and versatility. These synthetic materials, which contain fluorine atoms, are known for their exceptional resistance to heat, chemicals, and environmental factors. In the water industry, fluoropolymers are utilized in various applications to improve performance, durability, and safety.

Therefore, the use of fluoropolymers in the water industry offers several significant advantages:

Enhanced Durability: Water plants equipped with fluoropolymer components are more reliable and have a longer service life, reducing maintenance costs.

Improved Energy Efficiency: The low friction coefficient of fluoropolymers helps reduce energy consumption, as less energy is required to pump water through pipelines and valves lined with these materials.

Reduced Downtime: Non-stick properties simplify cleaning and maintenance, minimizing plant downtime and ensuring a consistent water supply.

Consistent Water Quality: Fluoropolymers' chemical inertness ensures that water quality remains consistent over time, meeting stringent regulatory standards.

The choice of fluoropolymer often depends on the specific application and the conditions it will be exposed to.

Examples:

Centrifugal Pumps, widely used in desalination plants to transport seawater through various stages of the desalination process, and in water treatment for transferring water at moderate pressures and flow rates, can have the shaft made with a fully enclosed PTFE gasket. The seals made from our PFA or PTFE FLUORINOID^® range are used to provide a reliable and chemically resistant seal between moving parts of the pump. These materials help prevent leaks and contamination of the pumped fluids.

Diaphragm valves, suitable for controlling the flow of chemicals and other fluids used in the treatment and pretreatment processes of desalination and water treatment, use PTFE bushings and the diaphragm is usually made from PFA or PTFE. 

Needle valves for dynamic applications used in RO, ultrafiltration, nanofiltration, and microfiltration system controls require a PTFE back-up ring. 

Material reference: PTFE - FLUORINOID^® FL801, FL803, FL805; PFA - FL810

In the desalination process, seawater is pressurized and forced through RO membranes to remove salt and impurities. High-pressure pumps with PVDF impellers are used to create the necessary pressure to push water through these membranes, allowing freshwater to be separated from saltwater. In water treatment plants, PVDF impellers are used in chemical dosing pumps to inject various chemicals into the water for coagulation, flocculation, disinfection, and pH adjustment.

Material reference: PVDF - FLUORINOID^® FL814

FLUORINOID^® FL818, ETFE, is used in membrane distillation processes, due to their excellent thermal stability, chemical resistance, and high porosity, which are advantageous in separating water from brine.

Gaskets and seals made from our FEP material are used to create reliable and chemically resistant seals in the evaporation unit, preventing leaks and ensuring the system's integrity.

Material reference: FEP - FLUORINOID^® FL831

Our company Fluorinoid^® register, based on elastomer, PTFE and thermoplastic technologies includes over 500 materials that offer exceptional characteristics enabling them to operate in demanding environmental conditions at temperatures to over 300°C.

Moreover, at Fluorocarbon we are dedicated to the manufacture of high-performance sealing solutions, soft seat configurations and precision machining to suit your specific needs.