Parameter study on remediating NO-3-N in groundwater by combination of iron and activated carbon
铁炭复配修复地下水中NO-3-N的条件研究

The combination of iron and activated carbon was used to remediate NO_3~- -N in groundwater. The experimental parameters influencing removal effect were studied. The results indicated that when reaction time was 1 hour, the rate of remediation of NO_3~- -N was 60. 85% at near neutral pH ( at initial pH of 6. 42). If Fe/C ratio was 1: 1, the optimal quantities of Fe and C were 4～5 g, respectively. When Fe/C ratio was 1: 1. 5, the remediation rate could reach to 72. 80% . The reaction rate was larger under high vibration intensity than that of low vibration intensity. Compared to the other catalysts, the catalytic effect of CuO was the best, which could in-crease remediation rate by 7. 5%. It is concluded that the mixture of iron and activated carbon to remediate groundwater NO_3~- -N is effective and feasible. Remediation rate increases with reaction time increasing. Under the condition of Fe/C ratio 1: 1, remediation rate has a positive correlation with quantity of reative materials. Limitless decrease of Fe/C ratio can not limitlessly increase remediation rate. Vibration intensity has a significant effect on NO_3~- -N treatment. There exists a hysteresis phenomenon in the process of NO_3~- -N remediation when vi-bration intensity is low. Some of metal oxide catalysts have promotive function for NO_3~- -N remediation by iron and activated carbon.