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Paper Information

Journal:   IRANIAN JOURNAL OF HEALTH AND ENVIRONMENT   WINTER 2014 , Volume 6 , Number 4; Page(s) 471 To 480.
 
Paper: 

PERFORMANCE EVALUATION OF MODIFIED FENTON PROCESS USING NANO SCALE ZERO-VALENT IRON IN NITRATE REDUCTION FROM AQUEOUS SOLUTION

 
 
Author(s):  KARIMI BEHROOZ*, RAJAIE MOHAMAD SADEGH, GHANADZADEH MOHAMAD JAVAD, MASHAYEKHI MASOME
 
* DEPARTMENT OF ENVIRONMENTAL HEALTH ENGINEERING, SCHOOL OF HEALTH, TEHRAN UNIVERSITY OF MEDICAL SCIENCE, TEHRAN, IRAN
 
Abstract: 

Backgrounds and Objectives: Nowadays, global concerns about nitrate in groundwater and its adverse impact on health have increased. This study aims to evaluate the efficiency of nitrate reduction from aqueous solution through modified Fenton process using Nano scale zero-valent iron.
Material and Methods: This research was an experimental study and performed at laboratory scale. Nitrate reduction was conducted by advanced oxidation process of Feo/Fe??/Fe?/H2O2 at pH 2-10, contact time 10-90 min, nitrate concentrations of 50-300 mg/L, and the molar ratio of [H2O2]/[Fe] 0.5-5. The effect of adding H2O2, molar ratio of reagents, contact time, and pH on nitrate removal was examined and optimal conditions for each of these parameters were determined. Spectrophotometer Dr/5000 was used to measure nitrate in the effluent.
Results: We found that the optimal parameters in our study were pH 3, the molar ratio [H2O2]/[Feo] of 0.5, and the contact time 15 min. By applying these conditions, nitrate removal efficiency at the retention time 15 min, initial nitrate concentration of 100 mg/L, iron concentration of 10 mg/L, and pH 4 for FeIII Fe??, Feo, Fe??/Feo/H2O2 and FeIII/Feo/H2O2 was 10.5, 27.6, 36.5, 62.3, and 74% respectively.
Conclusion: According to the experimental results, it was determined that modified Fenton process using zero iron nano-particles can reduce nitrate under optimal conditions and this method can be used for the removal of similar compounds.

 
Keyword(s): ADVANCED OXIDATION PROCESS, MODIFIED FENTON, AQUEOUS SOLUTIONS, REDUCTION OF NITRATE
 
References: 
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