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Medallion Series Point of Entry (POE)

Adsorption Systems

 

Adedge provides solutions for the entire home to reduce arsenic and other contaminants.  Whole household POE treatment is applicable to two basic groups of consumers: (1) those currently connected to municipal water supply (public water system) containing arsenic or heavy metals; and (2) those who obtain water from a private well source containing arsenic or heavy metals.  Another cost-effective consumer option is Point-of-Use (POU) which could address the potable drinking and cooking needs in the home.  Private well owners are faced with some unique challenges:

 

  • These wells are essentially unregulated and are not subject to the safe drinking water act requirements.

  • Due to the minimal testing requirements, owners are often not aware of the presence, concentration, or type of arsenic in their drinking water.

  • Consumers generally know little about the potential health affects from long term exposure to arsenic.

  • The naturally occurring arsenic in the groundwater in prone areas often has the Arsenic (III) form to some degree which is not removed adequately with conventional technologies.

  • Water treatment professionals are often unfamiliar with methods to address arsenic.

  • Arsenic is rapidly becoming a real estate transaction issue for property sales in some states.

 

What are the POE Treatment Alternatives?

 

Up until the past year, three basic alternatives have been commercially available for arsenic reduction for POE: Activated alumina adsorption, Anion Exchange, and Reverse Osmosis.   The most common alternatives implemented have been anion exchange and RO.  Up until now, use has been fairly limited for several reasons: relatively little awareness of the toxicity of arsenic, high relative cost, and low demand.  Adsorption using the Adedge high capacity iron oxide based media is rapidly filling the need generated by consumer awareness. The Bayoxide E33 is quickly emerging as the best alternatives for whole household treatment of arsenic.  Each technology has advantages and disadvantages.  The following table summarizes some of the pros and cons of the commercial options.    

 

Point of Entry Treatment for Arsenic

Feature

 Anion Exchange

Reverse Osmosis

Bayoxide E33 Iron Oxide Adsorption

 Type of arsenic treated

As (V)

As (V) 

As (V) and (III)

Pre-oxidation step required  for As removal

Yes

Yes

No

 Chemical Use

Salt

Membrane cleaning

No

 Loss (waste) of water

5%

25-75%

< 1%

 Frequency of   Regeneration

Approx. every 2000-4,000 gallons

 Not Applicable

Non regenerable, replace media after 2-4 years

 Hazardous waste generation

Yes

Concentrated arsenic reject

None

 Off-taste potential

Yes

No

No

 Maintenance

High

High

Low

 Arsenic “dumping”

Possible

No

No

Interferents or pretreatment needs

TSS, sulfate,  iron,  organics, tannins

TSS, Iron, manganese, silica, tannins

Iron, sulfides, phosphate, tannins

 

 

For POE applications, the Bayoxide E33 iron oxide mineral is typically utilized in fixed based adsorption vessels, operating in a downflow configuration with a single or multiple fixed bed pressure vessels containing the media where the arsenic removal occurs.  If a water softener is installed, the placement of the adsorption module is often post-softening, offering the benefits of pre-treatment for iron and hardness reduction.  Life of the media is dependent primarily on water quality, pH, and arsenic levels, but life cycle for a typical home with 30 ppb of arsenic and neutral pH may be 2-4 years before media replacement is required.  Backwashing is performed twice a month typically to “fluff” the bed to prevent channeling.  No arsenic is discharged to the drain during the backwash periodic backwash events.  The figure below shows a typical equipment arrangement for whole house treatment

 

For more information and questions regarding AdvantEdge Residential Systems e-mail us at advantedge@adedgetechnologies.com.

 

 To contact AdEdge click here.

 

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