Regulations restricting nitrate concentration in drinking water are in place in both the developed and developing world. The US environmental protection agency (US EPA) set a maximum contaminant concentration of 10 mg N/L (i.e., 45 mg/L as NO3−) for drinking water. Similarly, the maximum acceptable concentration, recommended by the World Health Organization (WHO) is 50 mg/L as NO3−.
Nitrate is a highly soluble and stable ion in water. Therefore, some techniques have been employed for efficient removal from water, such as adsorption, ion exchange(IX), reverse osmosis(RO), and biological treatments. Some of these methods have high operational costs. The IX process seems to be the most suitable for small water suppliers because of its simplicity, effectiveness, and relatively low cost. There are several nitrate selective resins which have proven to have an affinity for the following ions
NO3- > SO4- > Cl- > HCO3-
The IX process involves the passage of nitrate loaded water through a resin bed containing strong base anion exchange resins on which nitrate ions are exchanged for chloride until the
resin is exhausted.
Lanlang supply ion exchange resin for nitrate removal -- Lanlang TA456D.
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