Adedge Technologies, Water Treatment Systems

Quoted from http://www.adedgetech.com/ion_exchange.html:

Adedge Technologies, Water Treatment Systems

Ion Exchange Technology

Ion exchange (IX) is a method of removing undesirable metallic salt ions dissolved in an aqueous stream by exchanging them with other ions attached to a media, such as a synthetic resin.  This  reversible chemical process occurs because ions have differing affinities for the resin and will replace those ions with less affinity or attraction as they flow over the media.  The ions that are most often used as the exchange ions are sodium and chloride.  Some of the ions that may be removed are calcium, magnesium, iron, uranium, nitrate, bicarbonate, carbonate, sulfate, and hydroxide.  Eventually, the resin will be saturated with the undesirable ions.  Depending on the application, the resin may be regenerated on site, regenerated at a central regeneration facility, or be replaced and disposed.  Water softeners use ion exchange to remove the hardness ions, such as calcium and magnesium, and replace them with sodium or potassium ions to make the product water less likely to form scale on pipes, appliances, and fixtures.

AdEdge Technologies has systems for uranium reduction using AD92 IX resin.  This resin has a very high capacity for uranium removal and is not as susceptible to organic fouling as other resins.  It is easily and effectively regenerated with sodium chloride on site which provides a cost-effective way to extend the effective life of the media, reducing operating costs. Frequently Asked Questions: Uranium Removal

Nitrate removal systems using AD IX are also available from AdEdge for drinking water systems or industrial waste streams that need to reduce the nitrate level to comply with EPA standards.  This resin is designed specifically for removal of nitrate ions and is regenerated with sodium chloride on site to minimize costs.

AdEdge AD92 Anion Exchange media: AD92 IX

Ion Exchange technologiy can also be used for Radium removal applications.

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Adedge Technologies, Water Treatment Systems

Quoted from http://www.adedgetech.com/adsorption.html:

Adsorption Process

Water Treatment

Adedge Technologies, Water Treatment Systems

In the adsorption process, contaminants in the aqueous stream break their bond with water molecules and chemically adhere to a filter media. In most systems this is accomplished by directing the water flow through pressure vessels containing the filter media at a rate that allows enough contact time for the adsorption to occur. Several medias have been developed to reduce a variety of contaminants such as arsenic and other heavy metals, fluoride, and dissolved organic chemicals like pesticides or petroleum products.

AdEdge Technologies’ Bayoxide®E33 adsorption media is the industry standard for arsenic reduction reducing up to 99% of total arsenic, including both arsenic (III) and arsenic (V). It is also effective in reducing other heavy metals such as lead, cadmium, chromium, antimony and molybdenum. This revolutionary iron-based granular adsorption media has 4 to 10 times the capacity of many adsorption medias. Adedge’s product is specifically designed for commercial and residential POE and small drinking water systems to meet the new EPA arsenic standard of 10 ppb. The Bayoxide ®E33 media is discardable when spent and requires no chemicals or regeneration. It has become the premier product of choice for commercial and drinking water treatment systems for reliable, cost-effective, proven reduction of arsenic.

AD74, is an AdEdge adsorption media for reducing fluoride, which may be found naturally in some groundwater, added by municipalities, or in some industrial process waste streams. This media can be regenerated or used as a disposable one in smaller applications. It also has the capability to reduce some arsenic and other heavy metals.

Adedge Technologies, Water Treatment Systems

Quoted from http://www.adedgetech.com/oxidation_filtration.html:

Adedge Technologies, Water Treatment Systems

Oxidation Filtration

Oxidation/filtration refers to precipitative processes that are designed to remove naturally occurring iron, manganese, and sulfides from water. The processes involve the oxidation of the soluble forms of these contaminants to their insoluble forms and then removal by filtration of the precipitated particles.

Arsenic may be removed with the iron in some cases. Arsenic can be removed via two primary mechanisms: adsorption and co-precipitation. In groundwater containing both iron and arsenic, they are usually found in their reduced form. For optimum arsenic removal, a chemical oxidant such as sodium hypochlorite is often needed. Oxidized arsenic then adsorbs onto the iron hydroxide particles that are ultimately filtered out of solution. The arsenic removal efficiency is strongly dependent on the initial iron and arsenic concentrations.

The AdEdge Technologies oxidation/ filtration medias have high catalytic and oxidation activity, superior handling properties and stability, NSF 61 certification, require no permanganate or coagulation addition and low capital and operating costs compared to other alternatives due to the smaller system footprints. We have over 300 public water system installations and over 3,000 residential installations, more than any company in the U.S.

Water Treatment system for Uranium a Success in Village of Marshfield, Vermont

Following a very successful pilot test, AdEdge Technologies Inc. (AdEdge) was selected in 2007 by the Village of Marshfield, VT and the site’s engineer, Forcier Aldrich & Associates (FA&A), to supply and install a full scale uranium treatment system using its AD92 regenerative Ion Exchange (IX) Technology. Given the high naturally occurring uranium of 76 ug/L (nearly 3X the acceptable level), the municipal system had not utilized the two supply wells for several years. Bottled water was being provided to residents in the interim awaiting a solution. The affected wells serve a portion of the town and can produce up to 80 gpm with an expected average daily demand of 28,500 gallons per day. AdEdge was contracted to fabricate and install the treatment system by FA&A and the Village. The AdEdge team prepared the design documents to install a twin vessel parallel treatment system to reduce the high uranium levels to below MCLs. Both regenerative and throw away options were explored with the conclusion that the regenerative AD92 IX approach was the preferred and most cost-effective option for this site.

Designed to provide high efficiency removal of naturally-occurring uranium from groundwater supplies, the packaged, pre-engineered AdEdge AD92 system featured a twin vessel configuration flowing 160 gpm in parallel or 80 gpm per vessel. The system came complete with a manual regeneration/brine system to regenerate the IX resin periodically on demand. The complete system was packaged and delivered for site installation in July of 2007. AD92 IX media is a specialty strong base anion resin with high capacity for uranium removal. It provides superior removal efficiency for uranium and greater resistance to organic fouling than other media. The negatively charged uranium species binds to the anion resin as it passes through the bed and is periodically regenerated with salt brine solution periodically as the resin reaches a certain loading level. The system was permitted by the Vermont Water Supply Division and utilizes a local discharge permit for the periodic wastewater.

The system was placed into full time operation in early July, 2007 processing 80 gpm through the system. Initial results reported by the site’s State Certified Laboratory and reported to the State of Vermont Water Supply Division show excellent uranium reduction from 75 ug/L of uranium to below 2 ug/L (non-detectable) in the treated water. The system will be monitored regularly according to the terms of the operating permit.

Naturally Occurring Groundwater Uranium Treated in S. Lake Tahoe Community

In early March, 2009 after an evaluation period, AdEdge Technologies was selected among other alternatives and contracted by Elk Point Country Club Community (EPCCHOA) to provide a packaged treatment system for uranium removal that complied with the Nevada Department of Environmental Protection (NDEP) regulations. The EPCCHOA is located on the South East side of Lake Tahoe at Elk Point, Nevada, and this community is served by a well, which initially had a flow rate of 120 gpm. The flow of the well pump was modified to obtain the specified 60 gallons per minutes (gpm) design flow rate with an average uranium concentration of 40 µg/L, exceeding the EPA Maximum Contaminant Level (MCL) of 30 µg/L. Water quality is shown below. AdEdge worked closely with EPCCHOA’s engineer to provide techical support, drawings and final design of a uranium-treatment solution for the community that satisfied the NDEP drinking water regulations.

The regenerative AdEdge AD92 IX ion exchange approach was the preferred and most cost-effective option for this site, and this technology has been designed to provide high efficiency removal of naturally-occurring uranium from groundwater supplies. The AD92 IX media is a strong base-anion exchange resin used to selectively remove naturally-occurring uranium from groundwater. The AD92 IX media can selectively remove the negatively charged uranium anion to below the State and Federal MCL of 30 ppb. As uranium passes through the bed, it is removed allowing the chloride and bicarbonate ions to be exchanged for the uranium. In addition, AD92 IX resin provides superior regeneration efficiency and greater resistance to organic fouling.

The AdEdge AD92 pre-engineered, and packaged system provided for Elk Point Country Club is composed of twin 30-inch diameter vessels with a design flow of 60 gpm in a parallel configuration. The system is controlled during normal operation, backwash, and on-site regeneration using the Programmable Logic Controller PLC with a control panel. The system was furnished complete with a regeneration/brine system to regenerate the IX resin periodically on demand. A sodium chloride (brine) solution is used to regenerate the anion resin. The brine module is a separate system composed of a single polyethylene brine tank with valves, flow restrictors and rotometers which work during the automatic cycle operation, service, backwash, brining, slow rinse and fast rinse cycles.

The complete system was packaged and delivered for site installation in September of 2009 and was placed into full operation in early January of 2010, processing about 6,000 to 8,000 gallons per day. Water samples of the treated water were taken in February of 2010 and results from a State Certified Lab reports excellent performance with uranium levels of less than 0.001 mg/L or (1 ug/L).

AdEdge Treatment System Solves Arsenic Issue for Indiana School

AdEdge was selected in 2007 by the U.S. EPA and the host site in the Round 2a Arsenic Demonstration Program to implement a turnkey arsenic treatment for the Clinton Christian School in Goshen, IN. The Clinton Christian School water system is served by one well with a design flow of 25 gpm. The well provides potable water for the school with a population of 130 students / staff members. The treatment system receives water on the well side of the storage tanks with an elevated iron level of 0.81 mg/L, high manganese of 0.10 mg/l and an arsenic level of 29 ppb, above the EPA MCL of 10 ppb. AdEdge was contracted by U.S. EPA to provide and manage all aspects of the project including permitting with IDEM, design, and fabrication, installation, and startup activities. The system was AdEdge’s 11th full scale EPA demonstration project.

AdEdge proposed and installed a hybrid style treatment system designed to reduce iron, manganese and arsenic concurrently to below primary and secondary MCLs. The system utilizes an AD26 Oxidation/Filtration pretreatment technology followed by granular ferric oxide adsorption deploying Bayoxide® E33 GFO media. The design also includes a backwash management system capable of removing residual chlorine from the periodic backwash water to comply with the site’s NPDES discharge permit. The packaged modular system features a triplex 13-inch diameter composite filtration package plumbed in a parallel flow prior to the dual 24-inch composite module containing AdEdge Bayoxide® E33 adsorption media. The system is placed after a pre-chlorination module for oxidation of iron and manganese, as well as arsenic (III) species. The modular treatment system is equipped with automatic controls, backwashing features, switches, gauges, flow meters, and sample ports for a complete functioning unit.

Since full time operation began in February, 2008, the system has effectively reduced iron, manganese, and arsenic well below primary and secondary MCLs. Over 95% of iron and manganese and 85% arsenic reduction is being accomplished with the AD26 pretreatment technology. Arsenic in the final treated water following adsorption has consistantly been < 2 ppb. Approximately 2,500 gallons per day is being processed through the system on average. The site’s operator performs the routine sample collection and reporting associated with the U.S. EPA’s Demonstration Program requirements with quarterly reporting of the data by EPA’s contractor Battelle. A EPA summary report is publically available on the EPA website.

AdEdge AD26 System Treats High Iron & Manganese Levels in Georgia Community

In June 2009, the Stewart County Water Company selected and began working with AdEdge Technologies to assist with the design and implementation of an Iron and Manganese treatment system to serve the water supply for Stewart County in Louvale, Georgia. The site has one existing groundwater supply well that provides drinking water for approximately 225 connections with high levels of Manganese (Mn) and Iron (Fe) that exceed the secondary drinking water standard Maximum Contaminant Levels (MCL) and resulted in poor water quality being served to the community. The well produces approximately 45,000 gallons per day (gpd) during a typical 8 hours of well pump operation. The treatment system was designed for 100 gallons per minute (gpm) with an approximate iron concentration of 1.16 milligrams per liter (mg/L) and manganese levels of up to 0.05 milligrams per liter (mg/L). AdEdge assisted Stewart County Water Department with the necessary drawings, submittals, and technical documents for obtaining the necessary permits to install and operate the new treatment system.

AdEdge recommended an AD26 oxidation/filtration treatment system to reduce these parameters to below MCLs. The proposed integrated AdEdge AD26 iron and manganese treatment system for Stewart County included a pH adjustment module, (existing) pre-chlorination module, and backwash recycle module with integrated controls. The system consisted of a skid mounted model AD26-3660CS-S-2-AVH in parallel configuration, with a Programmable Logic Controller module (PLC) which regulates the automated control valves. System features also includes differential pressure switch, central control panel and local gauges, flow sensors and totalizers, including sample ports for a complete functioning package. Each vessel contains the catalytically active AD26 Manganese Dioxide media. In addition to the treatment system, the integrated water treatment system includes a Soda Ash feed injected prior to the filtration system to raise the raw water pH which is less than 5.5 to approximately 7.5 for enhancing contaminant removal. The treatment system also features a zero discharge backwash recycle module consisting of a backwash recycle pump skid and control panel, bag filter, and a vertical polyethylene storage tank that allows nearly 99% reuse of the backwash water, eliminating the need for discharge permits.

The system was successfully started up and commenced operation in December, 2009. The system throughput is based on a utilization of approximately 7-8 hours per day, with approximately 100 gpm (7.0 gpm/SqFt) being consistently treated for high manganese and iron levels that exceed the MCLs. To date the system’s performance is excellent and consistently achieving MCLs (over 9% removal) for these contaminants with no down time. Independent testing provided by Professional Water Services of Albany, GA, indicates non-detect levels of iron and manganese in the effluent of the treatment system.