Suspended solids removers

Sand filtration is a frequently used very robust method to remove suspended solids from water.
The filtration medium consists of a multiple layer of sand with a variety in size and specific gravity.


Applications for sand filtration:

• Preperation of cooling water
• Treatment of waste water
• Production of drinking water
• Filtration in swimming pools
• Pre filtration for membrane systems
• Filtration of grey or surface water

A sand filter has a dirt holding capacity of 3 to 6 kg TSS / m2 of sand surface.
When the filters are loaded with particles, the flow direction is reversed and the flow is increased to clean the filter again.
This step is called a backwash.

 

Chlorine removers

CWG activated carbon filters are used to reduce the excess of residual chlorine and to remove bad smells and chemical pollutants such as atrazine, hydrocarbons, etc.
The channelling created by water on the filter media shall be periodically removed with a backwash.
The backwash frequency can be programmed by time.
The system is to be sized according to the flow rate required by the user and to the level of chlorine and organic substances

CWG units are made up of:

• head with hydropneumatic valve in plastic material and electronic timer
• cylinder in plastic material covered in fibreglass containing special media of activated carbon of vegetal origin with adsorbent

Iron and mangane removers

Most part of underground waters contain soluted iron.
The way of its removal from the water is a first important technological step to be able to prepare the water for further production.
In most cases with the appearance of iron, the soluted mangan can appear too.
With the way of deferisation and demanganisation, which uses CWG company , iron and mangan are being successfully removed.
This procedure is based on usage of oxid - reductive ways, catalized with special fillings of filter materials, and the procedure is ended using reductive connections which neutralize activity of oxidated substances.
The whole technic - technological activity is based on the knowledge and experiences of the worlds known companies which support the activity of our company.

Birm
Birm is a granular filter material used in removal of iron and manganese dissolved in water.
In water, iron is usually in the form of iron bicarbonate and it cannot be filtered off.
Birm acts as undissolved catalyst which accelerates reaction between dissolved oxygen and iron.
Thereby, iron hydroxide is created which can be easily filtered off .
Birm is a great filter material, easy cleaned with backwash.

Pirulozit
Pirulozit is high quality and high purity manganese dioxide which is achieved by washing, drying and selection of specific catalytic mineral properties.
It is used as catalyst for reduction of iron, manganese and hydrogen sulphide dissolved in water in filters where they are mixed with sand.
It does not require regeneration with potassium permanganate.
Pirulozit is in accordance with standard ISO EN 13752 „Products for the treatment of drinking water.

MTM
MTM consist of a light weight granular core with a coating of manganese dioxide, and is used for reducing iron, manganese and hydrogen sulphide from water.
Its active surface coating oxidizes and precipitate soluble iron and manganese, and hydrogen sulphide is oxidized to a sulphur.

Nitrate removers

Denitrat units are anionic resin filters retaining nitrates present in water, to be regenerated with sodium chloride.
Regeneration can be programmed by volume/time.
The system is to be sized according to daily water consumption, peak flow rate and nitrates level.

Denitrat units are made up of:

• head with hydropneumatic valve in plastic material and electronic timer
• cylinder in plastic material covered in fibreglass containing anionic resin for nitrates removal.
• brine tank

Arsenic removers

The possibility of finding arsenic in underground waters, over maximum allowed concentration also supposes adequate possibility of its removal.
Different methods have been developed, just like technology procedures for arsenic removal out of underground waters used for drinking.
CWG uses special methods and systems for arsenic removal from the drinking water.
Such technology makes it possible to remove arsenic up to niveau under 8 microg/l of soluted arsenic.

 

For some tipical ground water You can find Amonium smell which can be soutible with our solutions for purifi cation of water.
To reduce Amonium content in water aplication and references offers You our DA filter series.

 

Neutralizing pH

Remineralization filters are mostly used for neutralize pH and to add calcium/bicarbonates to pH acidic water sources, like RO permeate, ground waters or rain water.

Flow range: 0,2 – 200 m3
Vessel material: Epoxy-coated steel or polyester composite
Tank diameter: 50 – 240 cm
Pressure: 4-9 bar
Bed dept: min 1 meter
Control: Automatic or manual backwash (timer or pressure diferential)