Pre-Treatment

We offer pre-treatment systems and components as preliminary filtration stage for our membrane systems or for stand-alone customer-specified applications.

Mechanical Filtration

EA offers pre-treatment systems and components as preliminary filtration stage for our membrane systems or for stand-alone customer-specified applications. Depending on the raw water condition, our team of engineers can recommend a configuration of filtration media, active carbon and/ or softening to provide the right combination of value and features for the end user.

Multi-Media Filters

Media filtration is used to reduce the level of suspended solids (turbidity) in incoming feed water. Suspended solids consist of small particles such as silt, clay, grit, organic matter, algae and other microorganisms.

Incoming feed water that is high in suspended solids can cause significant pressure drop and reduce the effectiveness of downstream filtration equipment such as reverse osmosis.

A properly designed and sized multi-media filter system would capture these mechanical contaminants, therefore preventing premature fouling of RO membranes. A multi-media filter is suggested when the Silt Density Index (SDI) value is greater than 3 or when the turbidity is greater than 0.5 NTU.

A multi-media filter typically contains several layers of different media. Some common types of media include anthracite, sand, garnet, zeolite, etc. The layered media arrangement allows for gradual filtration where the larger dirt particles are removed near the top of the media bed and the smaller dirt particles are being retained deeper and deeper in the media. This allows the entire bed to act as a filter allowing much longer filter run times between backwash and more efficient particulate removal. 

Carbon Filters

Carbon filters are using granular activated carbon (GAC) that has been treated to be extremely porous to remove contaminants and impurities, using chemical adsorption. When the water flows through active carbon filters the chemicals stick to the carbon resulting in purer water output.

Carbon filters are a necessary pre-treatment step for a reverse osmosis system where the feed water contains chlorine. Free chlorine needs to be removed from the feed water stream before entering the RO system to prevent damage to the RO membranes.

 

Water Softeners

Feed water to RO systems needs to be less than 5 GPG of hardness (85.5 mg/l) to prevent hardness deposits onto the surface of the RO membranes. For smaller RO systems (<10,000 GPD), we offer water softeners in a single or twin tank configuration.

Other Water Treatment Systems

ultrafiltration systems

Pre-Treatment Systems

We offer pre-treatment systems as preliminary filtration stage for our membrane systems or for stand-alone applications.

ultrafiltration systems

Ultrafiltration Systems

We offer ultrafiltration systems (UF) to remove suspended solids from the feed water.

reverse osmosis systems

Reverse Osmosis Systems

Reverse osmosis is capable of removing particles down to 0.0001 micron when used for commercial water treatment.

electro deionization systems

Electro Deionization Systems

A continuous membrane process in which a DC electric field is used to remove ions and polar species from an aqueous stream.

chemical dosing systems

Chemical Dosing Systems

We offer chemical dosing equipment as options to our water treatment systems or as stand-alone units.

nonofitration systems

Nanofiltration Systems

Nanofiltration is often used to filter water with low amounts of total dissolved solids, to remove organic matter and soften water.