Industrial Resin Nitrate Removal System

What is a nitrate removal system?

A nitrate removal system uses a nitrate removal resin as a filter medium to reduce nitrate levels in drinking water. It works through ion exchange, during which nitrate ions in the water are replaced by ions of another substance, usually chloride.

Here is how it works :

• Nitrate removal resin : this is the key element in the process. These polymers contain functional groups capable of capturing nitrate ions in the water.
• Nitrate removal filter : the system includes a vessel filled with these nitrate removal resins and an automatic valve (the same as for a water softener). Water passes through this vessel and comes into contact with the resins.
• Ion exchange : as water flows through the vessel, nitrate ions (NO3-) in the water bind to the nitrate removal resins, while ions of another element (usually chloride Cl-) that were initially bound to the resins are released into the water.
• Regeneration : over time, the resins become saturated with nitrate ions and must be regenerated to maintain their ion exchange capacity. This step involves passing a brine solution through the vessel. Chloride ions in the brine replace the nitrate ions bound to the resins, releasing the nitrates into the saltwater. This process restores the resins' ability to remove nitrates from the water.
• Rinsing : after regeneration, the system is rinsed to remove any excess brine and ensure that the treated water does not contain excessively high salt levels.

General specifications

• Metered valves
• High-pressure GRP vessel
• PE salt tank
• Food-grade anion exchange resin for nitrates
• The system's exchange capacity is for reference only. It is important to know the NO3, SO4 and Cl concentrations.
• Estimated NO3- loss of 15%.

Valve specifications

• Made of noryl
• Operating temperature : 4°C to 35°C
• Operating pressure : 2 to 6 bars
• Power supply : 230V - 12V 50Hz

System dimensions
	Vessel			Valve	Salt tank
	Model	A	B	C	D	E	Capacity (L)
DN6811	10x35	268 mm	893 mm	177 mm	332 mm	880 mm	70 L
DN6813	12x48	315 mm	1,244 mm	177 mm	582 mm	904 mm	140 L
DN6814	13x54	349 mm	1,398 mm	177 mm	660 mm	995 mm	200 L
DN6816	14x65	366 mm	1,674 mm	177 mm	780 mm	1,010 mm	300 L
DN6817	16x65	411 mm	1,705 mm	177 mm	780 mm	1,010 mm	300 L
DN7414	18x65	491 mm	1,722 mm	263 mm	860 mm	1,290 mm	500 L
DN7420	18x65	491 mm	1,722 mm	263 mm	860 mm	1,290 mm	500 L
DN7422	21x62	555 mm	1,721 mm	263 mm	860 mm	1,290 mm	500 L
DN7430	24x72	611 mm	2,168 mm	263 mm	1,055 mm	940 mm	750 L
DN6825	24x72	611 mm	2,168 mm	315 mm	1,055 mm	940 mm	750 L
DN6826	30x72	781 mm	2,200 mm	315 mm	1,180 mm	1,340 mm	1,000 L
DN6827	30x72	781 mm	2,200 mm	315 mm	1,180 mm	1,340 mm	1,000 L
DN6828	36x72	932 mm	2,210 mm	315 mm	1,180 mm	1,340 mm	1,000 L
DN6829	36x72	932 mm	2,210 mm	315 mm	1,600 mm	1,150 mm	1,500 L

 Maintenance and Consumables

This nitrate removal system should be used with a nitrate removal resin, available here.

It is difficult to give a precise figure for resin service life (10, 100, 1,000 regenerations), as it depends greatly on water quality and operating conditions.

The average service life of nitrate removal resins is generally 3 to 7 years, depending on several factors :

• Water quality : concentrations of nitrates, sulfates, chlorides and organic matter.
• Number of regenerations : the more frequent they are, the faster the wear.
• Regeneration conditions : brine quality and concentration, proper rinsing.
• Maintenance : regular checks of the water and resin condition.

In practice, in installations with low consumption, resins can last more than 7 years. Under industrial conditions or heavy use, capacity begins to decrease after 4–5 years.

In summary, their service life is often comparable to that of water softening resins under good operating conditions.