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Paper Information

Journal:   JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY   FALL 2006 , Volume 8 , Number 3 (30); Page(s) 21 To 28.
 
Paper: 

NITRATE REMOVAL FROM DRINKING WATER BY ION EXCHANGE AND REVERSE OSMOSIS

 
 
Author(s):  TORABIAN A., HASANI A.H., SAMAK ABEDI M.
 
* 
 
Abstract: 

Nitrate is one of the major components which is known as a chemical pollutant indicator in water and can be removed by physico-chemical and biological methods.

In this study, ion exchange and reverse osmosis processes were studied for nitrate removal.

The reverse osmosis system used in this research contained a TFC membrane with the capacity of 300 l/day, a pressure tank, and micro filters measuring 1 and 5 micrometers.

Synthetic nitrate solutions with concentrations of 25, 50, 100, 200 mg/l were injected into the system at a fixed amount of TSD.

The ion exchange column was made of plexy glass with a volumetric rate of 15 BV/hr.  

Nitrate with concentrations of 25, 50, 100 mg/l and different amounts of TDS (400, 700, 1000 milligrams per liter) were injected into the column.

The study lasted for 8 months and the following results were obtained:

-- An increase in nitrate concentration causes a decrease in efficiency from 93.5 to 82.5 percent for the reverse osmosis and from 99.7 to 95 percent for the ion exchange.

-- An increase in TDS has a negative effect on efficiency so that the removal efficiency changes from 99.7 to 83 percent in the ion exchange.

--An increase in the other anions like sulfate causes a decrease in efficiency in the ion exchange system.

--The regeneration solution has an effect on the operation of the ion exchange system. The best removal efficiency is about 99.7 percent, observed at a TDS of 400 when resin is regenerated by sodium hydroxide.

--The highest removal efficiency belongs to the nitrate concentration of 25 milligrams per liter and a TDS of 400 milligrams per liter in both methods: 99.8 percent for the ion exchange and 93.5 percent for the reverse osmosis systems.
 
Keyword(s): NITRATE, DRINKING WATER, ION EXCHANGE, REVERSE OSMOSIS
 
References: 
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