Filtration In The Process of Seawater Desalination

Seawater desalination is a process of water filtration that removes salts and other minerals from salt water. The desalination process makes saline water available for drinking and irrigation. Desalination systems are commonly used in bench hotels, resorts, vessels and other commercial or industrial applications. Desalination filtration systems are the only source of pure water in areas where traditional drinking water supplies are not available or where clean water sources have been depleted.

From seawater containing a lot of impurities to fresh water that is drinkable, it takes a series of filtration processes to make it happen. Hanke is equipped with a professional technical team to provide you with customized seawater desalination filtration solutions including unltrafiltration solutions and reverse osmosis filtration solutions.

For details, please refer to:

Seawater Desalination Filtration Solutions

Some seawater desalination facilitates are established onshore.

Ultrafiltration
Reverse Osmosis Filtration

Ultrafiltration

Background
In difficult waters, ultrafiltration has proven to be the best technology as the final treatment step before reverse osmosis filtration. It separates the solution by pressure or concentration gradients to remove suspended solids, endotoxins, bacteria, viruses and other pathogens, and get prepared for further membrane desalination systems.
Problem
Ultrafiltration equipment is very expensive. When the solution contains large particulate impurities, these impurities can cause damage to the ultrafiltration membrane, leading to equipment failure and increased maintenance costs.
Solution
To protect expensive ultrafiltration equipment, automatic backwash filters are generally installed before ultrafiltration equipment to remove large particulate impurities, such as organic wastes, plastic wastes, bacteria and silt.

Automatic backwash filters are used in seawater desalination plant.

Automatic backwash filters for ultrafiltration pretreatment

Reverse Osmosis Filtration

Background
In the desalination process, reverse osmosis (RO) filtration is often used in conjunction with ultrafiltration. RO filtration generally performs after ultrafiltration. It is more sophisticated than ultrafiltration equipment, and can remove harmful metal ions that cannot be removed by ultrafiltration equipment and obtain more purer water.
Problem
RO membranes are also very expansive. Impurities in the seawater leads to a shorter RO membrane life, a short operation period and high maintenance costs.
Solution
Prefiltration is performed before conducting reverse osmosis filtration as it can protect the RO membrane and keep it working efficiently for a longer period. Cartridge filters are generally adopted for RO pretreatment as they can effectively remove particles with a diameter of 5 μm and above to protect RO equipment.

The work is checking the conditions of cartridge filter before the RO equipment.

Cartridge filters for RO filtration pretreatment