Gravisand

Gravisand: A Powerful Tool for Environmental & Water Treatment

Gravisand filtration, also known as gravity sand filtration, is a widely used and effective method for treating water, wastewater, and other liquids. It involves passing the fluid through a bed of sand, typically in a downward flow, to remove suspended solids and other contaminants. This process relies on gravity to pull the water down through the sand bed, making it a simple and efficient solution.

How Gravisand Filtration Works:

1. Pre-Treatment: The water is typically pre-treated to remove large particles and debris before entering the sand filter. This pre-treatment step can involve screens, grit chambers, or other preliminary filtration techniques.
2. Sand Bed Filtration: The pre-treated water then flows through a bed of sand, typically made of silica sand. The sand particles act as a physical barrier, trapping suspended solids and other contaminants within the bed.
3. Backwashing: Periodically, the filter needs to be cleaned by backwashing. This process reverses the flow of water, using clean water to flush the trapped solids out of the sand bed.

Benefits of Gravisand Filtration:

• High Efficiency: Gravisand filters can effectively remove suspended solids, turbidity, and other contaminants from water.
• Cost-Effective: This technology is relatively simple and requires minimal maintenance, making it a cost-effective solution for water treatment.
• Reliable and Durable: Gravisand filters are known for their reliability and durability, with a long operational life.
• Versatile: This method can be applied in various water treatment applications, including municipal water treatment, industrial wastewater treatment, and swimming pool filtration.

Traveling Bridge Filter Components by USFilter/Davco:

USFilter/Davco is a leading manufacturer of water treatment equipment, including a range of traveling bridge filters designed for gravisand filtration. These filters utilize a bridge system that moves across the sand bed during the backwashing process.

Key Components of USFilter/Davco Traveling Bridge Filters:

• Bridge: A movable structure that travels along rails over the sand bed. It houses the backwash system and supports the filter media.
• Backwash System: A system that reverses the flow of water, allowing for efficient cleaning of the sand bed.
• Sand Bed: The heart of the filter, made of carefully selected sand particles that trap contaminants.
• Underdrain System: A network of pipes and manifolds that evenly distribute water through the sand bed.
• Control System: A sophisticated system that manages the filtration and backwashing process, ensuring optimal performance.

Applications of Traveling Bridge Filters:

These filters are commonly used in various applications, including:

• Municipal Water Treatment: Removing suspended solids and turbidity from drinking water.
• Industrial Wastewater Treatment: Removing contaminants from industrial wastewater before discharge.
• Swimming Pool Filtration: Maintaining water clarity and hygiene.

Conclusion:

Gravisand filtration is a proven and effective water treatment technology, providing a reliable and cost-effective solution for removing contaminants. Traveling bridge filters from USFilter/Davco offer a robust and efficient system for gravisand filtration, making them a popular choice for various applications. With their long service life and reliable performance, these filters play a vital role in ensuring clean and safe water for communities and industries worldwide.