To improve the efficiency of the NO2-removal process using Fe2+as a reducing agent in practical applications,this research designed three environmental factors of exogenous anions,Fe2+concentration,and reaction temperature to investigate their effects on the chemical reduction of NO2-by Fe2+.The results showed that although increasing the Fe2+concentration could significantly promote the removal rate of NO2-,it also reduced the utilization rate of Fe2+.In addition,raising the temperature and adding HCO3-/CO32-could both increase the removal rate and extent of NO2-.The type of by-product formed by iron oxidation was also regulated by temperature and HCO3-.At temperatures below 55 ℃(such as 30 ℃ and 40 ℃),the by-product of iron oxidation was mainly goethite and magnetite.At temperatures above 55 ℃,Magnetite was the only by-product.But magnetite can be formed at a lower temperature(40 ℃)with HCO3-.These results provide experimental references for improving the application mode and by-product secondary treatment utilization of Fe2+-based Chemo-denitrification and provide theoretical basis in actual engineering.
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