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Iron and Manganese Removal

Synergy Boreholes and Systems Ltd. can install a range of equipment to correct irregularities in the natural water as it comes from the ground. Most borehole installations will not need this extra treatment, but for those unlucky enough to have excessive mineral levels caused by gradual dissolving of these materials by the groundwater at depth, we can very often, almost always, offer a solution. When rain falls, the water has a naturally aggressive, slightly acidic nature. This water than dissolves chalk and/or metallic deposits present in the local rock strata which contaminates the water. This results in ground and borehole water containing a number of elements that would not normally be present in mains water. These contaminants (such as Iron and Manganese) then cause problems when the water is put to use.Acidic water results in corrosion of pipework, heating cylinders, and equipment.

 

Any Iron and Manganese present will result in poor tasting drinking water, in addition to staining baths, basins and any appliances with which the water may come into contact.These problematic waters can be treated with a Triplex system to both raise the pH and remove the Iron and Manganese. Firstly the water is passed through an aerator contact assembly which entrains air into the water to encourage initial precipitation of the contaminants. This has the effect of reducing the overall load on the filter media, making the complete removal of the contaminants much more efficient.The Triplex vessel uses a unique blend containing a pH correction media, an Iron and Manganese removal media, and a physical filter media. This works in three ways and has the combined effect of raising the pH of the water (eliminating the acidity), precipitating any dissolved Iron and Manganese in the water, and finally filtering out this precipitate. Clean treated water is then passed to service ready for use. Unlike other Iron and Manganese removal systems, the Triplex filter has an equal backwash and service flow. This means that the load on the borehole pump is minimised, with no requirement for backwash booster pumps. This makes Triplex ideally suited to domestic and light commercial applications with flow rates up to 4m3 per hour.

 

System Management, Backwashing and Regeneration

 

The aerator contact assembly is installed between the borehole pump and accumulator on a pressurised system, to ensure a consistent flow through the aerator. This results in the air venturi working effectively at all times. The Triplex filter is installed downstream of the accumulator.For non-pressurised systems relying on tank level switches to activate the borehole pump, a microswitch inside the filter valve is used to operate the borehole pump for backwashing. Untreated water can be prevented from bypassing to service during backwash by using a close down valve fitted to the standard backwash valve, or by specifically modifying the valve during manufacture of the filter.

 

Larger Triplex models have a bypass leg fitted to maintain high service flow through the aerator contact assembly, while still maintaining good levels of aeration. In areas of high organic loading, or waters with high levels of manganese, pre-treatment with ozone may be advisable. Alternatively intermittent backwashing with a dilute chlorine solution may be employed.