Xergy is an innovator in ionic materials and their packaging!
Controlling the movement of ions and molecules through nanoscale channels within ionic materials offers revolutionary pathways for development of home, energy, industrial, medical, and sensing products.
Xergy's mission is to deliver these products to the world!


Xergy Inc.
Xergy is an innovator in ionic materials and their packaging!
Controlling the movement of ions and molecules through nanoscale channels within ionic materials offers revolutionary pathways for development of home, energy, industrial, medical, and sensing products.
Xergy's mission is to deliver these products to the world!


Background:

Xergy inc. is an award winning, five-year-old, high technology company; that is a global leader in integrating ‘proton’ exchange membranes into exciting, new and transformational products.
Recently, Xergy Inc. announced the introduction of the most reliable, compact, in-situ ozone production system based on its proton exchange membrane technology. This product is designed for simple integration into many common industrial and household applications for disinfection, sanitation, bleaching and laundry applications; and comes with dedicated engineering and service support.




Background:

Ozonation is a common industrial process. There are many applications where ozone gas is added to pure water,to provide drinking water or process water to clean meats and equipment during food processing. Ozone generators are much more compact, reliable, and energy efficient than other sanitation/bleaching systems, without handling chemicals.

Currently, these sanitation processes also include chlorination, UV light, and ozone treatment are the main methods employed. Of these methods, ozone treatment is the most promising, providing superior disinfection capabilities coupled with the eco-friendly nature of dissolved ozone.

When chlorine gas is reacted with water, hypochlorite ions are formed. Hypochlorite ions are generally termed as free chlorine and are effective in undergoing reactions with various chemical impurities and lysing cells. If ammonia is added as well as chlorine gas, monochloramine is formed. However, monochloramine is a much weaker disinfectant than free chlorine, and as such it is typically employed as a secondary disinfecting agent. A third chlorine based agent is chlorine dioxide. It has similar disinfecting properties to free chlorine, but the mechanism of disinfection is different.

There are many methods for ozone generation including electrolysis, corona discharge, and UV light. It can either be generated in air, or evolved directly in water. Ozone is a strong oxidizing agent, and also effectively lyses cell walls to destroy microorganisms.

UV lamps emitting wavelength of 254nm are typically used to sterilize waters. The light inactivates vital functions of microorganisms, effectively killing them.

A key metric for determining the effectiveness of a disinfecting agent is the CT value associated with specific pathogens. The CT value is a product of the required contact time and concentration to achieve inactivation of various microorganisms, and typically has units of mg-min/L. Lower CT values require lower concentrations of a given chemical and less contact time, and are indicative of stronger disinfecting agents. Ozone and free chlorine treatment exhibit similar strengths for inactivating viruses such as E. coli, but ozone is far superior to chlorine for fighting bacteria such as Giardia lamblia.Chlorine treatments have displayed minimal effectiveness in disinfecting Cryptosporidium, whereas Ozone has a relatively low CT value of about 12.




Oxidation potential is another metric used to assess the strength of various disinfectants. Larger values correlate to improved ability to oxidize and kill microorganisms, and remove chemical impurities from water. Ozone has an oxidation potential of 2.08V, greater than that of chlorine disinfectants and hydrogen peroxide.



When using chemicals to disinfect a water source, it is essential to understand potential disinfection by-products that may be produced. Chlorination leads to the formation of trihalomethanes, such as chloroform, which are carcinogenic. The formation of trihalomethanes comes from the reaction of chlorine with organic matter present in the water that is being treated. Utilizing ozone instead of chlorine removes the formation of trihalomethanes, but still brings about undesirable by-products. Ozone has the potential to oxidize bromide ions, forming bromate ions, which are carcinogens. Production of bromate can be reduced by pretreating the water with a method to reduce any ions present before disinfecting with ozone.

After the water has been treated, the water will contain residual amounts of the disinfectants. This residual ensures that there is no further growth of microorganisms. A residual of 5 mg/L is the suggested amount of free chlorine to ensuredrinking water quality3, whereas maintaining an ozoneresidual as low as 0.01 mg/L has been shown to prevent further microbial growth4. In the case of chlorination, excess chlorine can lead to stomach discomfort, irritation if in contact with skin, and adds a distinctive taste and smell to the water. Ozone, however, has such a short half-life, approximately 30 min at ambient temperatures5, that it will not be in significant concentrations when the water is ready to be used. In the case where it is necessary to have no residual ozone, such as drinking water, a UV lamp can be implemented at very low costs to catalyze the decomposition of the ozone. When ozone decomposes it breaks down to form oxygen, and increased oxygen levels can be beneficial in certain applications.

Ozone Generation:

There are several methods employed to generate ozone including corona discharge, UV light, and electrochemical cells. Because ozone has such a short half-life, it must be generated on site at the required point of use. Corona discharge and UV light require air/oxygen to generate ozone, whereas electrochemical cells can utilize water.


The most widely used method for commercially generating ozone is corona discharge. Power is supplied to a dielectric material, which surrounds an air gap. The dielectric material generates a corona, or electric field, which splits oxygen into atomic oxygen. Atomic oxygen is highly reactive, and will combine with molecular oxygen to form ozone. Corona discharge produces higher levels of gaseous ozone than UV treatment. However, humidity has a negative impact on corona discharge as it is based on electric currents. Dry air is required, or there will be a significant reduction in the overall ozone production. An oxygen feed can be used instead of dry air, but this adds additional costs associated with installing and operating an oxygen concentrator. The oxygen feed improves ozone production per unit volume, and also eliminates the evolution of nitrogen oxides and nitric acid. The high levels of energy utilized by this process generate large amounts of heat, which must be dissipated from the system to ensure efficiency. If the desired application is water treatment, then a contactor must be added to dissolve the ozone in water. This further increases installation and operating costs of the corona discharge method.

UV generation of ozone consists of a UV lamp, typically operating at 185nm, and an air feed. UV generation allows for more stable production, as humidity is not an issue, and eliminates the formation of nitrogen oxides and nitric acid. However, production rates are much lower than corona discharge.

There are several methods employed to generate ozone including corona discharge, UV light, and electrochemical cells. Because ozone has such a short half-life, it must be generated on site at the required point of use. Corona discharge and UV light require air/oxygen to generate ozone, whereas electrochemical cells can utilize water.


3H_2 O→O_3+6H^++6e^-,    E^0=1.51 V

O_2+H_2 O→O_3+2H^++2e^-,   E^0=2.08 V

The PEM allows migration of protons to the cathode side of the cell, which recombine to form hydrogen. Ozone production through electrolysis is typically lower than corona discharge, however ozone is produced in-situ. This eliminates the need for an oxygen concentrator and a liquid contactor, reducing space requirements, installation costs, and power requirements.

The main advantages of producing ozone with an electrolytic system are:

-     There is no ionic contamination because the feedwater is being dissociated using a solid hydrated ion exchange membrane.
-     The process water being disinfected is the source of oxygen for the generation ofozone
-     consequently, no outside contamination is introduced into the system being treated
-     The ozone is dissolved in the process water as soon as it is formed i.e. in situ, or at point of use
-     This results in ozonation with the minimum amount of equipment i.e. compact systems
-     By operating the cell under pressure, relatively high ozone concentrations can beproduced

XIZONE System Integration

Designed specifically for challenging environments such as food and beverage and biopharmaceutical industries, this cost-effective, high-quality ozone generator has been successfully integrated into a variety of industrial and appliance applications. XIZONE systems are compact, easy-to-use wall-mounted units.

Typical installations involve engineering systems with customized, mass flow controllers, Stainless Steel Filter Housings, Fittings, gas analysis instrumentation, process monitors, and software integration into the process environment needed.

Most modem pure water networks, are constructed as closed loop systems in which the water ispumped through one or more circulation loops to different consumer points. Depending on the application of the process water, there will be differing amounts and types of equipment installed in the system. For all applications it was found best to install the ozone generation system in the loop return just before it re-enters the storage tank. The by-pass flow for the electrolytic system is tappedoff before the loop's pressure retaining valve and reintroduced on the low pressure side.

The main downside to using an electrochemical cell is the need to use relatively pure water, as ions and metallic contaminants can negatively impact the performance of the PEM. Metallic contaminants can however, be addressed with a variety of pretreatment options. Another consideration is the presence of Bromate ions in water. But these too can be remediated by pretreatment. Quite simply, installing a XIZONE system, is not a plug and play option; but requires intelligent application and analysis. XIZONE application engineers are available to support every installation, and to provide ongoing support services so the that systems operate as needed, when needed.

In addition, wherever ozone is used, safety measureshave to be taken in order to protect personnel and equipment from unintendedozone exposure. One important safety measure is the destruction of excess ozonegas that is not used in a process. The ozone gas destruct units are designed to safelyconvert high levels of ozone into benignoxygen, reducing the ozone level down to detection limit, well below safety thresholds. Again, XIZONE application engineers are available to assist in safe installation and operation.

Below are some schematics of our units integrated into appliances, these are for illustration only, however any one skilled the art can provide other examples readily.


UNIQUE ELEMENTS OF XERGY’S XIZONE GENERATORS

Xergy’s Xizone system is designed for high performance and durability. We have engineered reliability into our systems by identifying operating risks and mitigating those risks with proprietary and patented elements.

For example, one disadvantage of electrochemical ozone generation is the susceptibility of the membrane to contaminants in water streams. To mitigate this risk, Xergy has developed a unique feature by feeding ozonated water upstream of the generation system. i.e. ahead of the generator’s water intake. This is done so that Ozone can react with contaminants such as iron ahead of the generator – and precipitate a solid product that can be filtered – prior to water entry to the ozone generator system. Thus the core (high value) electrochemical components (the membrane and catalytic electrodes) are protected, with particulate filters from dissolved contaminants in the water.

Xergy’s Xizone system has parallel operating cells functioning at all times. This means that should there ever be a failure in one cell there are other cells that can (and do) provide the ozonation service needed. The probability of all cells failing at one time is virtually zero. And this is a unique patented feature of our electrochemical systems.

In addition, we understand that disinfection systems need to be up and running at all times. In order to provide operational assurance, Xergy has implemented downstream sensing technology to measure ozone content. Sensor data is continuously monitored, recorded and transmitted to Xergy’s operations center. Our systems have embedded electronics and data recording to support this task; and this is a unique (patented) feature of our systems. In addition, service technicians are on 24 hour notice to visit plants if low levels are detected.

Xergy’s systems are designed for 100% availability, and easy (quick) servicing to ensure there is minimal interruption to operations.


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  •           Plant & Labs:
                           299A Cluckey Drive,
                            Harrington, DE 19952
  •                    Tel: 302 629 5768
                         Fax: 302 629 6038
  •                  info@xergyinc.com

shop

IndiaTVnow

  •           Plant & Labs:
                           299A Cluckey Drive,
                            Harrington, DE 19952
  •                    Tel: 302 629 5768
                         Fax: 302 629 6038
  •                  info@xergyinc.com