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Enva Launch New Water Recycling Application - Irish and UK First - Environmental solutions provider Enva has announced the creation of a breakthrough electro-coagulation application, which is unique to Ireland and the UK, and offers the potential to reduce industrial water consumption by as much as 90%
Enva Launch New Water Recycling Application - Irish and UK First

 

NewswireToday - /newswire/ - Dublin, Ireland, 2008/07/23 - Environmental solutions provider Enva has announced the creation of a breakthrough electro-coagulation application, which is unique to Ireland and the UK, and offers the potential to reduce industrial water consumption by as much as 90%.

   
 
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Environmental solutions provider Enva has announced the creation of a breakthrough electro-coagulation application, which is unique to Ireland and the UK, and offers the potential to reduce industrial water consumption by as much as 90%.

At the core of this technology is an electro-coagulation process, which brings about the coagulation (change into a thickened mass) of suspended and dissolved particles in water by applying an electric field, which binds these particles together forming larger particles that will settle out of the water. After a complex series of chemical processes to coagulate and flocculate (separate a solid from a solution) suspended solids, the addition of polyelectrolyte completes the flocculation and leads to separation of clear water and flocculated aluminium hydroxide and suspended solids.

The Enva electro-coagulation process is a very intensive process, which operates in a very compact electrolysis cell. In a plant commissioned with Waterford Crystal, the cell only occupies about 100 litres. However, it contains about 20 square metres of electrodes and allows a contact time as long as 20 seconds for the solution being treated. The current passing through the cell is matched to the water flow rate through the cell in a ratio which is determined through technical expertise.

Although electro-coagulation has been around for a very long time (about 100 years), there are very few commercial applications, even though there have been many attempts. Dr. Frank Holland of Enva notes that “We suspect that poor electrochemical engineering has caused many previous attempts to fail and this has hindered the commercial application of electro-coagulation. Our system was designed by an electrochemist who has had 40 years experience in electrochemical cell design, so sound electrochemical engineering has been applied to the design of the cell system. This includes the uniform distribution of the water being treated within the cell, uniform distribution of the electricity within the cell, and in particular highly engineered electrical contacts to the electrodes ensuring good contact for the life of each electrode”.

He continued: “Another problem encountered in applying electro-coagulation is electrode fouling or passivation, which causes the process to fail, and is also time variable and water quality variable. Therefore, we developed a computer controlled technique, which can be tuned to the properties of the water being treated so that passivation is prevented, while the process gives continuous operation of the electrodes”.

The cell design was conceived by Enva’s electrochemist after a very extensive study of previous electro-coagulation research. During the initial trial process, a 100 Amp electro-coagulation test rig was installed in Enva's laboratory and assessment were carried out on various effluents. An 8,000 Amp electro-coagulation cell system was then designed for Waterford Crystal and following this, a single 1000 Amp cell was run as a pilot plant using the wastewater from Waterford Crystal. With the aim of meeting the target design parameters of the water for recycling purposes, the pilot trials tested the electro-coagulation cell system in terms of flow rate, electricity input, conductivity of the solutions, voltage requirements, current reversal frequency and time, and polyelectrolyte additions. The electrodes in the pilot cell were run to destruction to test the efficiency of the cell design and in particular the electrical contacts to the electrodes which performed superbly.

In terms of the potential for reducing industrial water consumption, Dr. Holland outlined that this depends on the application. He added: “For example a laundry must have its final rinse with fresh water, so a volume of perhaps 25% would have to be disposed of, and therefore the reduction would be 75%. Equally where very high purity water is needed throughout most of the application, recycling is reduced, and the key benefit in such cases of electro-coagulation is clean up of the water prior to discharge. But for those instances like Waterford Crystal where the water could be routinely reused again and again, our studies show that the water saving could be up to 90%”.

Commenting on the commissioning of this plant, Finbarr Pyne, Technical Development Director at Enva added: “Not only does this system clearly demonstrate the fruits of our approach towards continually investing in research and development, it also reinforces the depth of expertise at our disposal, and which is required to deliver innovative world-class environmental solutions towards minimising and reducing the rate of resource depletion by society. A wide range of skills were required for this project including electrochemistry, electrochemical engineering, chemistry, plastics engineering, mechanical engineering, electrical engineering, computer software engineering”.

Initial indications suggest that this system – which has been patented by Enva – has the potential to offer significant environmental and cost benefits for sectors such as steam cleaning, pressure washing, textile manufacturing, metal plating, meat and poultry processing, commercial laundry, mining operations and municipal sewage system plants. In all cases, Enva can provide preliminary assessment of feasibility of treatment process and costs, along with laboratory testing of effluent at its Cork facility.

About Enva
A subsidiary of DCC plc, Enva Ireland Ltd specialises in providing innovative, efficient and cost-effective solutions for the treatment and disposal of a diverse range of wastes. The company is structured into six divisions, with each division focusing on a certain business area and having its own identity within Enva. These divisions include Hazardous Waste, Water Treatment, Soil Treatment, Industrial & Automotive, Field Services, and Underground Services. It operates four licensed facilities in the Republic of Ireland (Portlaoise, Shannon, Cork and Dublin) and two in Northern Ireland (Drumaness and Carryduff). It also has a Water Treatment operation based in Runcorn in the UK.

It operates high tech laboratories, at its Portlaoise, Shannon and Cork facilities, which focus on developing innovative treatment processes focusing primarily on recovery rather than disposal. Currently, Enva is the only environmental solutions company within Ireland to offer this level of specialised technical expertise combined with the infrastructure to deliver this service.

Enva Water Treatment specialises in accurately diagnosing operating issues at water and effluent treatment plants and then identifying and developing the most appropriate and cost-effective solution. It also provides a comprehensive range of water treatment products, as well as laboratory and engineering solutions for water and effluent treatment. This division recently moved to a new purpose built 20,000 sq ft facility in Ringaskiddy, Co. Cork, where it employs 25 people and houses the company’s new state of the art microbiological and chemistry laboratories. Enva hopes to expand its water treatment services to broader markets in Ireland and beyond, and in particular, Enva hopes to capitalise on the development of its unique electro-coagulation water recycling technology.

 
 
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Enva Launch New Water Recycling Application - Irish and UK First

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