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首页> 外文期刊>Journal of Hazardous Materials >Chemical denitrification of water by zero-valent magnesium powder
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Chemical denitrification of water by zero-valent magnesium powder

机译：零价镁粉对水进行化学反硝化

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A laboratory-scale study was conducted in batch mode to investigate the feasibility of using zero-valent magnesium (Mg~0), for removal of nitrate from aqueous solution. Reaction pH, dose of Mg~0, initial nitrate concentration and temperature were considered variable parameters during the study. Strong acidic condition enhanced nitrate reduction and in absence of external proton addition, reaction pH increased rapidly above ten and insignificant nitrate removal (7-16%) was achieved. At Mg~0:NO_3~--N molar ratio of 5.8 and controlled reaction pH of 2, 84% denitrification efficiency was achieved (initial NO_3~--N 50 mg/L) under ambient temperature and pressure and total nitrogen removal was 70% with 3.2% and 10% conversion of initial NO_3~--N to NO_2~--N and NH_4~+-N, respectively. The reaction was first order with respect to nitrate concentration. Nitrate removal rate decreased with solution pH and increased linearly with Mg~0 dose. Nitrate removal was coupled with 96-100% removal of dissolved oxygen and 85-90% generation of soluble Mg~(2+) ion. An activation energy (E_a) of nitrate reduction over the temperature range of 10-50℃ was observed as 17.7 kJ mol~(-1).
机译：以批处理方式进行了实验室规模的研究，以研究使用零价镁（Mg〜0）去除水溶液中硝酸盐的可行性。在研究过程中，反应pH，Mg〜0剂量，硝酸盐初始浓度和温度被认为是可变参数。在强酸性条件下，硝酸盐还原作用增强，并且在不添加外部质子的情况下，反应pH值迅速增加到10以上，并且硝酸盐去除率不高（7-16％）。在Mg〜0：NO_3〜--N摩尔比为5.8且控制反应pH为2的条件下，在环境温度和压力下达到了84％的反硝化效率（初始NO_3〜--N 50 mg / L），总氮去除率为70 ％，初始NO_3〜--N转化为NO_2〜--N和NH_4〜+ -N分别为3.2％和10％。该反应相对于硝酸盐浓度是一级的。硝酸盐去除率随着溶液pH值的降低而降低，并随着Mg〜0剂量的增加而线性增加。硝酸盐的去除与96-100％的溶解氧去除和85-90％的可溶性Mg〜（2+）离子产生有关。在10-50℃的温度范围内，硝酸盐还原的活化能（E_a）为17.7 kJ mol〜（-1）。

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