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Paper Information

Journal:   JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY   FALL 2007 , Volume 9 , Number 3 (34); Page(s) 1 To 12.
 
Paper: 

THE STUDY OF NITRATE ELIMINATION FROM DRINKING WATER VIA REVERSE OSMOSIS AND NANO FILTRATION

 
 
Author(s):  HASANI A.H., JAVID A., BORGHEEI M., CHAVOSH BASHI S.A.A.*
 
* FACULTY OF ENVIRONMENT AND ENERGY, SCIENCE AND RESEARCH BRANCH, ISLAMIC AZAD UNIVERSITY
 
Abstract: 

Water is the most important and the main solvent in the nature. Almost all compounds, even to a little extent, can be solved in water and for this reason, water contains many impurities. Nitrate is known as the last stage of nitrogen compound oxidation which causes meta-hemoglobin in infants and forms carcinogenic nitrosamine compounds.
Nowadays, various physico-chemical and biological processes are used to remove nitrate from drinking water. One of the most practical physico-chemical nitrate removal methods is the ion exchange and membrane processes including nano-filtration and reverse osmosis.
The main objective of the present study - considering the above-mentioned points - is the evaluation of nanofiltration and reverse osmosis efficiency for the removal of nitrate and other ions. This study was conducted over a sixteen-month period (August 2005 to December 2006) using nano-filtration and reverse osmosis pilot.
In this investigation, a domestic reverse osmosis treatment pilot and an industrial nano-filtration pilot were used. By increasing the nitrate concentration in water and by adding chloride and sulfate ions with different concentrations, it was tried to investigate their effects on the nitrate removal process.
According to the obtained results, by increasing the nitrate concentration, the efficiency of both nano-filtration and reverse osmosis systems for the removal of nitrate decreased. In this study, the highest efficiency in both systems for removal of nitrate was observed in the concentration of 25 mg/l. In both systems, for the effects of sulfate and chloride on nitrate, a synthetic solution of sulfate and chloride was prepared and along with nitrate was injected into the system. During the investigation, the effects of each one of the ions on the mentioned systems were studied. Also, by increasing the sulfate and chloride concentration, the efficiency of the systems in removing the nitrate decreases.
In a homogenous concentration of the mixture of nitrate and sulfate in drinking water (100 mg/l), sulfate is removed by the systems to a larger extent, but in a homogenous concentration of the mixture of nitrate and chloride in drinking water (100 mg/l), mostly nitrate is removed. At equal concentrations, nitrate removal efficiency in nitrate compound with sulfate is higher that that in nitrate compounds with chloride. The highest efficiency obtained from nitrate removal experiments are 95.6% and 93.4% in nano-filtration and reverse osmosis systems, respectively.

 
Keyword(s): REVERSE OSMOSIS, NANO-FILTRATION, NITRATE, CHLORIDE, SULFATE
 
 
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APA: Copy

HASANI, A., & JAVID, A., & BORGHEEI, M., & CHAVOSH BASHI, S. (2007). THE STUDY OF NITRATE ELIMINATION FROM DRINKING WATER VIA REVERSE OSMOSIS AND NANO FILTRATION. JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 9(3 (34)), 1-12. https://www.sid.ir/en/journal/ViewPaper.aspx?id=102021



Vancouver: Copy

HASANI A.H., JAVID A., BORGHEEI M., CHAVOSH BASHI S.A.A.. THE STUDY OF NITRATE ELIMINATION FROM DRINKING WATER VIA REVERSE OSMOSIS AND NANO FILTRATION. JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY. 2007 [cited 2021July25];9(3 (34)):1-12. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=102021



IEEE: Copy

HASANI, A., JAVID, A., BORGHEEI, M., CHAVOSH BASHI, S., 2007. THE STUDY OF NITRATE ELIMINATION FROM DRINKING WATER VIA REVERSE OSMOSIS AND NANO FILTRATION. JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, [online] 9(3 (34)), pp.1-12. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=102021.



 
 
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