Aquamaster Water Treatment Ltd has been installing and maintaining well water treatment, and borehole water treatment systems in Hertfordshire since 1975. We can supply and install water filtration systems, water purification filters for the following problems. iron removal, sulphur removal, Reverse osmosis for brackish water, salty water problems, Ultraviolet systems for dealing with Bacteria problems, water softeners for water hardness, Ph correction filtration for Low Ph water, Reverse osmosis for desalination for saltwater boreholes.
A specialized filter media used principally for removing Chlorine or organic compounds from water. Most of the Activated Carbon used for well water treatment is made from baking crushed coconut shell until it produces a charcoal type material. This is
then activated with high-pressure steam, leaving the carbon with many minute active pores on its surface. The ability of Activated Carbon to remove contaminants from raw water is dependent upon the length of time the water spends in contact with the
media. Therefore sizing the filters correctly is crucial for effective performance.
Nitrate removal system for well water treatment. The presence of Nitrates in water causes many problems, ranging from blue baby syndrome (if fed to babies under 6 months old) to contamination of poultry if used as feed water for farmed birds. The source of Nitrates in groundwater is usually from farming fertilizers. The EEC permitted maximum is 50mg/l with an advisory maximum of 25mg/l. Nitrate dissolved in water is not able to be removed by simple filtration. It can only be reduced by either regeneration of media or disposable cartridge type ion exchange systems or eliminated by reverse osmosis.RO systems can be used to treat all of the water for a specific application, or just to remove the Nitrates from a drinking water supply in the kitchen. For single dwellings with one drinking water tap and low water consumption, a point of use system provides efficient reduction at a low cost. For large or multiple properties, commercial and industrial well water treatment applications, regenerated ion exchange systems will be preferred. It is these systems that are illustrated here.
How do Nitrate Removal WELL WATER TREATMENT Systems Work?
Nitrate removal is a similar process to water softening, using a slightly different polymer resin. The resin removes the Nitrate (and Sulphate due to their chemical
similarity) from the water and replaces them with Chloride ions. Once the resin bed is nearly exhausted of Chloride ions, the control valve carries out a regeneration of the bed.
This is achieved by passing a Chloride rich brine solution (made up of common salt
dissolved in water) through the resin bed, which flushes out the Nitrate and Sulphate to
drain, replacing them with Chlorides again. After a final rinse to remove excess brine the
unit is automatically put back into service again. The only input required by the user is to
ensure that the brine tank is kept topped up with salt.
Contact Assemblies are used a lot these days on well water treatment to draw air into the water supply, allowing them to mix and have a specified contact time before
either going through the remainder of the filtration system or straight to service. Mixing air with water allows the oxygen in the water to oxidize certain components of the water. The most common use is to oxidize soluble iron and Manganese into their insoluble oxides. Ammonium, Nitrites, and Hydrogen Sulphide can also be treated using oxidation.
Both metallic and some non-metallic contaminants can be removed from water by passing the water through a bed of specialized media. These media act in two ways; triggering the precipitation of the contaminants to form an insoluble particle and then physically filtering out the contamination to leave clean water. By selecting the correct media, very specific water problems can be treated easily.
When rain falls, the water has a naturally aggressive, slightly acidic nature. This water then dissolves chalk and/or metallic deposits present in the local rock strata which lead to contamination of the water. This results in ground and borehole water containing a number of elements that would not otherwise be present in mains water. These contaminants ( such as iron and manganese ) then cause problems when the water is put into use.
Acidic water results in corrosion of pipework, hot water heating cylinders, and equipment. Any iron and manganese present will result in poor tasting water, in addition to staining baths, basins, and any appliances with which the water may come into contact.
PH value below 7 is considered to be acidic, and corrosion accelerates at pH levels below 6.5, with levels below 6.0 considered to be extremely aggressive. It is usually difficult to remove iron and manganese from acid water, so often the first step in the process is to raise the pH.
The simplest and safest way to raise the pH is to run the water through a pressure vessel containing a bed of specially activated limestone. This is a mixture of calcium and magnesium salts, which are the salts found in the water with a pH greater than 7.0. This limestone gradually dissolves increasing the pH level of the water. As the limestone dissolves, it will need refilling periodically. Refilling is straightforward as the media is inert and easy to handle.
This results in the 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 well water treatment 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 minimized, 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, Back-washing, and Regeneration The aerator contact assembly is installed between the borehole pump and accumulator
on a pressurized system, to enable 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-pressurized systems relying on tank level switches to activate the borehole pump, a micro-switch inside the filter valve is used to operate the borehole pump for back-washing.
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 the manufacture of the filter. Triplex models FT350 to FT750 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.
Improved performance over existing Iron and Manganese filters
Light media for easier back-washing
Aeration and degassing in the same unit
Reduces Hydrogen Sulphide
Aerator manufactured from plastic parts that can be acid cleaned
High-efficiency aerator venturi
Maximize air/water contact within Aerator pressure vessel
High flow 1″ Couplings
Yellow discolouration of water can be caused by organic compounds called tannins.
These are usually found in peaty areas and in water supplies that are affected by
surface water. Our Tannex well water treatment filters consist of a mix of two organic scavenger resins
which are very effective in colour removal. These resins are regenerated using Sodium
Chloride brine, using the Chloride ion. The filter, therefore, operates in a similar way to a
softener, with a once-weekly backwash and regeneration.
Commercial Tanex well water treatment filtration system”
Although carbon filters can be used to remove organics, the media quickly becomes fouled when the organic load is high. Tannex consists of a mix of two organic scavenger resins. These have a special porous structure that will capture organic species by a number of different mechanisms. The resin is regenerated with sodium chloride brine, using the chloride ion. The filter, therefore, operates in a similar way to a water softener, with a periodic backwash and regeneration. Brine levels are higher than the equivalent water softener.
I have a number of customers that have had wells drilled, only to find out that the water is very salty. With salty water there is only one way that this can be removed, this is with a reverse osmosis system. The desalinated water is stored in a cold water storage tank, then by a pressure pump, is pumped into the plumbing system of the property. Normally there would have to be a ph adjuster added as a post water treatment system, this would bring the water up to a neutral of ph 7 +. This will prevent the copper pipe from pin holing.